1
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Gonzalez de Vega R, Clases D, Cunningham BA, Ganio K, Neville SL, McDevitt CA, Doble PA. Spatial distribution of trace metals and associated transport proteins during bacterial infection. Anal Bioanal Chem 2024; 416:2783-2796. [PMID: 38057634 DOI: 10.1007/s00216-023-05068-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/08/2023] [Accepted: 11/20/2023] [Indexed: 12/08/2023]
Abstract
Innate immune systems alter the concentrations of trace elements in host niches in response to invading pathogens during infection. This work reports the interplay between d-block metal ions and their associated biomolecules using hyphenated elemental techniques to spatially quantify both elemental distributions and the abundance of specific transport proteins. Here, lung tissues were collected for analyses from naïve and Streptococcus pneumoniae-infected mice fed on a zinc-restricted or zinc-supplemented diet. Spatiotemporal distributions of manganese (55Mn), iron (56Fe), copper (63Cu), and zinc (66Zn) were determined by quantitative laser ablation-inductively coupled plasma-mass spectrometry. The murine transport proteins ZIP8 and ZIP14, which are associated with zinc transport, were also imaged by incorporation of immunohistochemistry techniques into the analytical workflow. Collectively, this work demonstrates the potential of a single instrumental platform suitable for multiplex analyses of tissues and labelled antibodies to investigate complex elemental interactions at the host-pathogen interface. Further, these methods have the potential for broad application to investigations of biological pathways where concomitant measurement of elements and biomolecules is crucial to understand the basis of disease and aid in development of new therapeutic approaches.
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Affiliation(s)
- Raquel Gonzalez de Vega
- The Atomic Medicine Initiative, University of Technology Sydney, Broadway, New South Wales, Australia
- TESLA-Analytical Chemistry, Institute of Chemistry, University of Graz, Graz, Austria
| | - David Clases
- The Atomic Medicine Initiative, University of Technology Sydney, Broadway, New South Wales, Australia
- Nano Micro LAB, Institute of Chemistry, University of Graz, Graz, Austria
| | - Bliss A Cunningham
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Philip A Doble
- The Atomic Medicine Initiative, University of Technology Sydney, Broadway, New South Wales, Australia.
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2
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Ganio K, Nasreen M, Yang Z, Maunders EA, Luo Z, Hossain SI, Ngu DHY, Ellis D, Gu J, Neville SL, Wilksch J, Gunn AP, Whittall JJ, Kobe B, Deplazes E, Kappler U, McDevitt CA. Hfe Permease and Haemophilus influenzae Manganese Homeostasis. ACS Infect Dis 2024; 10:436-452. [PMID: 38240689 PMCID: PMC10863617 DOI: 10.1021/acsinfecdis.3c00407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 01/07/2024] [Accepted: 01/08/2024] [Indexed: 02/10/2024]
Abstract
Haemophilus influenzae is a commensal of the human upper respiratory tract that can infect diverse host niches due, at least in part, to its ability to withstand both endogenous and host-mediated oxidative stresses. Here, we show that hfeA, a gene previously linked to iron import, is essential for H. influenzae manganese recruitment via the HfeBCD transporter. Structural analyses show that metal binding in HfeA uses a unique mechanism that involves substantial rotation of the C-terminal lobe of the protein. Disruption of hfeA reduced H. influenzae manganese acquisition and was associated with decreased growth under aerobic conditions, impaired manganese-superoxide dismutase activity, reduced survival in macrophages, and changes in biofilm production in the presence of superoxide. Collectively, this work shows that HfeA contributes to H. influenzae manganese acquisition and virulence attributes. High conservation of the hfeABCD permease in Haemophilus species suggests that it may serve similar roles in other pathogenic Pasteurellaceae.
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Affiliation(s)
- Katherine Ganio
- Department
of Microbiology and Immunology, the Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Marufa Nasreen
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
| | - Zihao Yang
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
| | - Eve A. Maunders
- Department
of Microbiology and Immunology, the Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Zhenyao Luo
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
- Institute
for Molecular Bioscience, The University
of Queensland, St Lucia, Queensland 4072, Australia
| | - Sheikh Imamul Hossain
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- School
of Life Sciences, University of Technology
Sydney, Ultimo, New South Wales 2007, Australia
| | - Dalton H. Y. Ngu
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
- Institute
for Molecular Bioscience, The University
of Queensland, St Lucia, Queensland 4072, Australia
| | - Daniel Ellis
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
| | - Jin Gu
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
| | - Stephanie L. Neville
- Department
of Microbiology and Immunology, the Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Jonathan Wilksch
- Department
of Microbiology and Immunology, the Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Adam P. Gunn
- Department
of Microbiology and Immunology, the Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Jonathan J. Whittall
- School of
Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Boštjan Kobe
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
- Institute
for Molecular Bioscience, The University
of Queensland, St Lucia, Queensland 4072, Australia
| | - Evelyne Deplazes
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- School
of Life Sciences, University of Technology
Sydney, Ultimo, New South Wales 2007, Australia
| | - Ulrike Kappler
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- Australian
Infectious Diseases Research Centre, The
University of Queensland, St Lucia, Queensland 4072, Australia
| | - Christopher A. McDevitt
- Department
of Microbiology and Immunology, the Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
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3
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Gillespie B, Houghton MJ, Ganio K, McDevitt CA, Bennett D, Dunn A, Raju S, Schroeder A, Hill RA, Cardoso BR. Maternal selenium dietary supplementation alters sociability and reinforcement learning deficits induced by in utero exposure to maternal immune activation in mice. Brain Behav Immun 2024; 116:349-361. [PMID: 38142918 DOI: 10.1016/j.bbi.2023.12.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 11/24/2023] [Accepted: 12/19/2023] [Indexed: 12/26/2023] Open
Abstract
Maternal immune activation (MIA) during pregnancy increases the risk for the unborn foetus to develop neurodevelopmental conditions such as autism spectrum disorder and schizophrenia later in life. MIA mouse models recapitulate behavioural and biological phenotypes relevant to both conditions, and are valuable models to test novel treatment approaches. Selenium (Se) has potent anti-inflammatory properties suggesting it may be an effective prophylactic treatment against MIA. The aim of this study was to determine if Se supplementation during pregnancy can prevent adverse effects of MIA on offspring brain and behaviour in a mouse model. Selenium was administered via drinking water (1.5 ppm) to pregnant dams from gestational day (GD) 9 to birth, and MIA was induced at GD17 using polyinosinic:polycytidylic acid (poly-I:C, 20 mg/kg via intraperitoneal injection). Foetal placenta and brain cytokine levels were assessed using a Luminex assay and brain elemental nutrients assessed using inductively coupled plasma- mass spectrometry. Adult offspring were behaviourally assessed using a reinforcement learning paradigm, the three-chamber sociability test and the open field test. MIA elevated placental IL-1β and IL-17, and Se supplementation successfully prevented this elevation. MIA caused an increase in foetal brain calcium, which was prevented by Se supplement. MIA caused in offspring a female-specific reduction in sociability, which was recovered by Se, and a male-specific reduction in social memory, which was not recovered by Se. Exposure to poly-I:C or selenium, but not both, reduced performance in the reinforcement learning task. Computational modelling indicated that this was predominantly due to increased exploratory behaviour, rather than reduced rate of learning the location of the food reward. This study demonstrates that while Se may be beneficial in ameliorating sociability deficits caused by MIA, it may have negative effects in other behavioural domains. Caution in the use of Se supplementation during pregnancy is therefore warranted.
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Affiliation(s)
- Brendan Gillespie
- Department of Psychiatry, Monash University, Clayton, VIC 3168, Australia
| | - Michael J Houghton
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, VIC 3168, Australia; Victorian Heart Institute, Monash University, Clayton, VIC 3168, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC 3000, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC 3000, Australia
| | - Daniel Bennett
- Department of Psychiatry, Monash University, Clayton, VIC 3168, Australia
| | - Ariel Dunn
- Department of Psychiatry, Monash University, Clayton, VIC 3168, Australia
| | - Sharvada Raju
- Department of Psychiatry, Monash University, Clayton, VIC 3168, Australia
| | - Anna Schroeder
- Department of Psychiatry, Monash University, Clayton, VIC 3168, Australia.
| | - Rachel A Hill
- Department of Psychiatry, Monash University, Clayton, VIC 3168, Australia.
| | - Barbara R Cardoso
- Department of Nutrition, Dietetics and Food, Monash University, Notting Hill, VIC 3168, Australia.
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4
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Maunders EA, Giles MW, Ganio K, Cunningham BA, Bennett-Wood V, Cole GB, Ng D, Lai CC, Neville SL, Moraes TF, McDevitt CA, Tan A. Zinc acquisition and its contribution to Klebsiella pneumoniae virulence. Front Cell Infect Microbiol 2024; 13:1322973. [PMID: 38249299 PMCID: PMC10797113 DOI: 10.3389/fcimb.2023.1322973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 12/08/2023] [Indexed: 01/23/2024] Open
Abstract
Klebsiella pneumoniae is a World Health Organization priority pathogen and a significant clinical concern for infections of the respiratory and urinary tracts due to widespread and increasing resistance to antimicrobials. In the absence of a vaccine, there is an urgent need to identify novel targets for therapeutic development. Bacterial pathogens, including K. pneumoniae, require the d-block metal ion zinc as an essential micronutrient, which serves as a cofactor for ~6% of the proteome. During infection, zinc acquisition necessitates the use of high affinity uptake systems to overcome niche-specific zinc limitation and host-mediated nutritional immunity. Here, we report the identification of ZnuCBA and ZniCBA, two ATP-binding cassette permeases that are highly conserved in Klebsiella species and contribute to K. pneumoniae AJ218 zinc homeostasis, and the high-resolution structure of the zinc-recruiting solute-binding protein ZniA. The Znu and Zni permeases appear functionally redundant with abrogation of both systems required to reduce K. pneumoniae zinc accumulation. Disruption of both systems also exerted pleiotropic effects on the homeostasis of other d-block elements. Zinc limitation perturbed K. pneumoniae cell morphology and compromised resistance to stressors, such as salt and oxidative stress. The mutant strain lacking both systems showed significantly impaired virulence in acute lung infection models, highlighting the necessity of zinc acquisition in the virulence and pathogenicity of K. pneumoniae.
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Affiliation(s)
- Eve A. Maunders
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Matthew W. Giles
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Bliss A. Cunningham
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Vicki Bennett-Wood
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Gregory B. Cole
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Dixon Ng
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Christine C. Lai
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Stephanie L. Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Trevor F. Moraes
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Aimee Tan
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
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5
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Rowan JA, Rudd SE, Ganio K, McDevitt CA, White JM, Donnelly PS. Copper(II) Complexes of 2,2'- Bisdipyrrins: Synthesis, Characterization, Cell Uptake, and Radiolabeling with Copper-64. Inorg Chem 2023; 62:20666-20676. [PMID: 37552883 DOI: 10.1021/acs.inorgchem.3c01551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Complexes prepared with positron-emitting copper-64 are of interest as imaging agents for positron emission tomography (PET). This work investigates the potential of using acyclic tetrapyrrolic 2,2'-bisdipyrrins as ligands to prepare charge-neutral, lipophilic, cell-permeable, redox active complexes with positron-emitting copper-64. The synthesis and characterization of a series of tetrapyrrolic 2,2'-bisdipyrrin copper(II) complexes are reported. Four 2,2'-bisdipyrrin copper(II) complexes were prepared with different functional groups in the meso-position of the ligands. Two of the new copper(II) complexes, one palladium(II) complex, and one nickel(II) complex were characterized by X-ray crystallography, which demonstrated that the copper(II) is in a distorted square planar environment. An investigation of the electrochemical properties of the complexes by cyclic voltammetry revealed that the complexes undergo multiple quasi-reversible processes. A comparison of the cyclic voltammetry of the copper complexes with their palladium(II) analogues suggests that these redox processes are ligand-based and not metal-based. The copper(II) complexes are cell-permeable in A431 mammalian cells and are nontoxic at concentrations of 50 μM. The ligands can be radiolabeled with copper-64 at room temperature.
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Affiliation(s)
- Jacob A Rowan
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Stacey E Rudd
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Jonathan M White
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Paul S Donnelly
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria 3010, Australia
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6
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Hussein M, Allobawi R, Zhao J, Yu H, Neville SL, Wilksch J, Wong LJM, Baker M, McDevitt CA, Rao GG, Li J, Velkov T. Integrated Transcriptomic and Metabolomic Mapping Reveals the Mechanism of Action of Ceftazidime/Avibactam against Pan-Drug-Resistant Klebsiella pneumoniae. ACS Infect Dis 2023; 9:2409-2422. [PMID: 37878861 PMCID: PMC10714405 DOI: 10.1021/acsinfecdis.3c00264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 10/02/2023] [Accepted: 10/11/2023] [Indexed: 10/27/2023]
Abstract
Here, we employed an integrated metabolomics and transcriptomics approach to investigate the molecular mechanism(s) of action of ceftazidime/avibactam against a pan-drug-resistant K. pneumoniae clinical isolate from a patient with urinary tract infection. Ceftazidime/avibactam induced time-dependent perturbations in the metabolome and transcriptome of the bacterium, mainly at 6 h, with minimal effects at 1 and 3 h. Metabolomics analysis revealed a notable reduction in essential lipids involved in outer membrane glycerolipid biogenesis. This disruption effect extended to peptidoglycan and lipopolysaccharide biosynthetic pathways, including lipid A and O-antigen assembly. Importantly, ceftazidime/avibactam not only affected the final steps of peptidoglycan biosynthesis in the periplasm, a common mechanism of ceftazidime action, but also influenced the synthesis of lipid-linked intermediates and early stages of cytoplasmic peptidoglycan synthesis. Furthermore, ceftazidime/avibactam substantially inhibited central carbon metabolism (e.g., the pentose phosphate pathway and tricarboxylic acid cycle). Consistently, the dysregulation of genes governing these metabolic pathways aligned with the metabolomics findings. Certain metabolomics and transcriptomics signatures associated with ceftazidime resistance were also perturbed. Consistent with the primary target of antibiotic activity, biochemical assays also confirmed the direct impact of ceftazidime/avibactam on peptidoglycan production. This study explored the intricate interactions of ceftazidime and avibactam within bacterial cells, including their impact on cell envelope biogenesis and central carbon metabolism. Our findings revealed the complexities of how ceftazidime/avibactam operates, such as hindering peptidoglycan formation in different cellular compartments. In summary, this study confirms the existing hypotheses about the antibacterial and resistance mechanisms of ceftazidime/avibactam while uncovering novel insights, including its impact on lipopolysaccharide formation.
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Affiliation(s)
- Maytham Hussein
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Rafah Allobawi
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Jinxin Zhao
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Heidi Yu
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Stephanie L. Neville
- Department
of Microbiology and Immunology, The Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Jonathan Wilksch
- Department
of Microbiology and Immunology, The Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Labell J. M. Wong
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Mark Baker
- Discipline
of Biological Sciences, Priority Research Centre in Reproductive Biology,
Faculty of Science and IT, University of
Newcastle, University
Drive, Callaghan, NSW 2308, Australia
| | - Christopher A. McDevitt
- Department
of Microbiology and Immunology, The Peter Doherty Institute for Infection
and Immunity, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Gauri G. Rao
- Division
of Pharmacotherapy and Experimental Therapeutics, Eshelman School
of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599-7355, United
States
| | - Jian Li
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Tony Velkov
- Monash
Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
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7
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Higgs C, Kumar LS, Stevens K, Strachan J, Korman T, Horan K, Daniel D, Russell M, McDevitt CA, Sherry NL, Stinear TP, Howden BP, Gorrie CL. Comparison of contemporary invasive and non-invasive Streptococcus pneumoniae isolates reveals new insights into circulating anti-microbial resistance determinants. Antimicrob Agents Chemother 2023; 67:e0078523. [PMID: 37823632 PMCID: PMC10649040 DOI: 10.1128/aac.00785-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/23/2023] [Indexed: 10/13/2023] Open
Abstract
Streptococcus pneumoniae is a major human pathogen with a high burden of disease. Non-invasive isolates (those found in non-sterile sites) are thought to be a key source of invasive isolates (those found in sterile sites) and a reservoir of anti-microbial resistance (AMR) determinants. Despite this, pneumococcal surveillance has almost exclusively focused on invasive isolates. We aimed to compare contemporaneous invasive and non-invasive isolate populations to understand how they interact and identify differences in AMR gene distribution. We used a combination of whole-genome sequencing and phenotypic anti-microbial susceptibility testing and a data set of invasive (n = 1,288) and non-invasive (n = 186) pneumococcal isolates, collected in Victoria, Australia, between 2018 and 2022. The non-invasive population had increased levels of antibiotic resistance to multiple classes of antibiotics including beta-lactam antibiotics penicillin and ceftriaxone. We identified genomic intersections between the invasive and non-invasive populations and no distinct phylogenetic clustering of the two populations. However, this analysis revealed sub-populations overrepresented in each population. The sub-populations that had high levels of AMR were overrepresented in the non-invasive population. We determined that WamR-Pneumo was the most accurate in silico tool for predicting resistance to the antibiotics tested. This tool was then used to assess the allelic diversity of the penicillin-binding protein genes, which acquire mutations leading to beta-lactam antibiotic resistance, and found that they were highly conserved (≥80% shared) between the two populations. These findings show the potential of non-invasive isolates to serve as reservoirs of AMR determinants.
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Affiliation(s)
- Charlie Higgs
- Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Lamali Sadeesh Kumar
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Kerrie Stevens
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Janet Strachan
- Communicable Diseases Branch, Department of Health, Victoria, Australia
| | - Tony Korman
- Department of Microbiology, Monash Health, Clayton, Victoria, Australia
| | - Kristy Horan
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Diane Daniel
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Madeline Russell
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - Norelle L. Sherry
- Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Department of Infectious Diseases, Austin Health, Heidelberg, Victoria, Australia
| | - Timothy P. Stinear
- Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Centre for Pathogen Genomics, University of Melbourne, Melbourne, Victoria, Australia
| | - Benjamin P. Howden
- Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Department of Infectious Diseases, Austin Health, Heidelberg, Victoria, Australia
- Centre for Pathogen Genomics, University of Melbourne, Melbourne, Victoria, Australia
| | - Claire L. Gorrie
- Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
- Centre for Pathogen Genomics, University of Melbourne, Melbourne, Victoria, Australia
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8
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Hossain S, Morey JR, Neville SL, Ganio K, Radin JN, Norambuena J, Boyd JM, McDevitt CA, Kehl-Fie TE. Host subversion of bacterial metallophore usage drives copper intoxication. mBio 2023; 14:e0135023. [PMID: 37737591 PMCID: PMC10653882 DOI: 10.1128/mbio.01350-23] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 08/02/2023] [Indexed: 09/23/2023] Open
Abstract
IMPORTANCE During infection, bacteria must overcome the dual threats of metal starvation and intoxication. This work reveals that the zinc-withholding response of the host sensitizes S. aureus to copper intoxication. In response to zinc starvation, S. aureus utilizes the metallophore staphylopine. The current work revealed that the host can leverage the promiscuity of staphylopine to intoxicate S. aureus during infection. Significantly, staphylopine-like metallophores are produced by a wide range of pathogens, suggesting that this is a conserved weakness that the host can leverage to toxify invaders with copper. Moreover, it challenges the assumption that the broad-spectrum metal binding of metallophores is inherently beneficial to bacteria.
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Affiliation(s)
- Saika Hossain
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Jacqueline R. Morey
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Stephanie L. Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Jana N. Radin
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Javiera Norambuena
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, New Jersey, USA
| | - Jeff M. Boyd
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, New Jersey, USA
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Thomas E. Kehl-Fie
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
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9
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Sharkey LKR, Guerillot R, Walsh CJ, Turner AM, Lee JYH, Neville SL, Klatt S, Baines SL, Pidot SJ, Rossello FJ, Seemann T, McWilliam HEG, Cho E, Carter GP, Howden BP, McDevitt CA, Hachani A, Stinear TP, Monk IR. The two-component system WalKR provides an essential link between cell wall homeostasis and DNA replication in Staphylococcus aureus. mBio 2023; 14:e0226223. [PMID: 37850732 PMCID: PMC10746227 DOI: 10.1128/mbio.02262-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 09/05/2023] [Indexed: 10/19/2023] Open
Abstract
Among the 16 two-component systems in the opportunistic human pathogen Staphylococcus aureus, only WalKR is essential. Like the orthologous systems in other Bacillota, S. aureus WalKR controls autolysins involved in peptidoglycan remodeling and is therefore intimately involved in cell division. However, despite the importance of WalKR in S. aureus, the basis for its essentiality is not understood and the regulon is poorly defined. Here, we defined a consensus WalR DNA-binding motif and the direct WalKR regulon by using functional genomics, including chromatin immunoprecipitation sequencing, with a panel of isogenic walKR mutants that had a spectrum of altered activities. Consistent with prior findings, the direct regulon includes multiple autolysin genes. However, this work also revealed that WalR directly regulates at least five essential genes involved in lipoteichoic acid synthesis (ltaS): translation (rplK), DNA compaction (hup), initiation of DNA replication (dnaA, hup) and purine nucleotide metabolism (prs). Thus, WalKR in S. aureus serves as a polyfunctional regulator that contributes to fundamental control over critical cell processes by coordinately linking cell wall homeostasis with purine biosynthesis, protein biosynthesis, and DNA replication. Our findings further address the essentiality of this locus and highlight the importance of WalKR as a bona fide target for novel anti-staphylococcal therapeutics. IMPORTANCE The opportunistic human pathogen Staphylococcus aureus uses an array of protein sensing systems called two-component systems (TCS) to sense environmental signals and adapt its physiology in response by regulating different genes. This sensory network is key to S. aureus versatility and success as a pathogen. Here, we reveal for the first time the full extent of the regulatory network of WalKR, the only staphylococcal TCS that is indispensable for survival under laboratory conditions. We found that WalKR is a master regulator of cell growth, coordinating the expression of genes from multiple, fundamental S. aureus cellular processes, including those involved in maintaining cell wall metabolism, protein biosynthesis, nucleotide metabolism, and the initiation of DNA replication.
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Affiliation(s)
- Liam K. R. Sharkey
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Romain Guerillot
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Calum J. Walsh
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Adrianna M. Turner
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Jean Y. H. Lee
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Stephanie L. Neville
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Stephan Klatt
- The Florey Institute of Neuroscience and Mental Health, Melbourne Dementia Research Centre, The University of Melbourne, Parkville, Victoria, Australia
| | - Sarah L. Baines
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Sacha J. Pidot
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Fernando J. Rossello
- University of Melbourne Centre for Cancer Research, The University of Melbourne, Melbourne, Victoria, Australia
- Australian Regenerative Medicine Institute, Monash University, Melbourne, Victoria, Australia
| | - Torsten Seemann
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
- Department of Microbiology and Immunology, Centre for Pathogen Genomics, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Hamish E. G. McWilliam
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Ellie Cho
- Biological Optical Microscopy Platform, University of Melbourne, Melbourne, Victoria, Australia
| | - Glen P. Carter
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Benjamin P. Howden
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
- Department of Microbiology and Immunology, Centre for Pathogen Genomics, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Abderrahman Hachani
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Timothy P. Stinear
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
- Department of Microbiology and Immunology, Centre for Pathogen Genomics, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Ian R. Monk
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
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10
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Leiter O, Zhuo Z, Rust R, Wasielewska JM, Grönnert L, Kowal S, Overall RW, Adusumilli VS, Blackmore DG, Southon A, Ganio K, McDevitt CA, Rund N, Brici D, Mudiyan IA, Sykes AM, Rünker AE, Zocher S, Ayton S, Bush AI, Bartlett PF, Hou ST, Kempermann G, Walker TL. Selenium mediates exercise-induced adult neurogenesis and reverses learning deficits induced by hippocampal injury and aging. Cell Metab 2023; 35:1085. [PMID: 37285804 DOI: 10.1016/j.cmet.2023.04.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
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11
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Anderson AJ, Crameri JJ, Ang CS, Malcolm TR, Kang Y, Baker MJ, Palmer CS, Sharpe AJ, Formosa LE, Ganio K, Baker MJ, McDevitt CA, Ryan MT, Maher MJ, Stojanovski D. Human Tim8a, Tim8b and Tim13 are auxiliary assembly factors of mature Complex IV. EMBO Rep 2023:e56430. [PMID: 37272231 PMCID: PMC10398661 DOI: 10.15252/embr.202256430] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 05/11/2023] [Accepted: 05/16/2023] [Indexed: 06/06/2023] Open
Abstract
Human Tim8a and Tim8b are paralogous intermembrane space proteins of the small TIM chaperone family. Yeast small TIMs function in the trafficking of proteins to the outer and inner mitochondrial membranes. This putative import function for hTim8a and hTim8b has been challenged in human models, but their precise molecular function(s) remains undefined. Likewise, the necessity for human cells to encode two Tim8 proteins and whether any potential redundancy exists is unclear. We demonstrate that hTim8a and hTim8b function in the assembly of cytochrome c oxidase (Complex IV). Using affinity enrichment mass spectrometry, we define the interaction network of hTim8a, hTim8b and hTim13, identifying subunits and assembly factors of the Complex IV COX2 module. hTim8-deficient cells have a COX2 and COX3 module defect and exhibit an accumulation of the Complex IV S2 subcomplex. These data suggest that hTim8a and hTim8b function in assembly of Complex IV via interactions with intermediate-assembly subcomplexes. We propose that hTim8-hTim13 complexes are auxiliary assembly factors involved in the formation of the Complex IV S3 subcomplex during assembly of mature Complex IV.
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Affiliation(s)
- Alexander J Anderson
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Jordan J Crameri
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Ching-Seng Ang
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Tess R Malcolm
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
- School of Chemistry, The University of Melbourne, Parkville, Vic, Australia
| | - Yilin Kang
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Megan J Baker
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Catherine S Palmer
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Alice J Sharpe
- Department of Biochemistry and Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Vic, Australia
| | - Luke E Formosa
- Department of Biochemistry and Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Vic, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Parkville, Vic, Australia
| | - Michael J Baker
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Parkville, Vic, Australia
| | - Michael T Ryan
- Department of Biochemistry and Molecular Biology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Vic, Australia
| | - Megan J Maher
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
- School of Chemistry, The University of Melbourne, Parkville, Vic, Australia
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Vic, Australia
| | - Diana Stojanovski
- Department of Biochemistry and Pharmacology, The University of Melbourne, Parkville, Vic, Australia
- The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Vic, Australia
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12
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Hossain S, Morey JR, Neville SL, Ganio K, Radin JN, Norambuena J, Boyd JM, McDevitt CA, Kehl-Fie TE. Host subversion of bacterial metallophore usage drives copper intoxication. bioRxiv 2023:2023.05.30.542972. [PMID: 37398167 PMCID: PMC10312489 DOI: 10.1101/2023.05.30.542972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Microorganisms can acquire metal ions in metal-limited environments using small molecules called metallophores. While metals and their importers are essential, metals can also be toxic, and metallophores have limited ability to discriminate metals. The impact of the metallophore-mediated non-cognate metal uptake on bacterial metal homeostasis and pathogenesis remains to be defined. The globally significant pathogen Staphylococcus aureus uses the Cnt system to secrete the metallophore staphylopine in zinc-limited host niches. Here, we show that staphylopine and the Cnt system facilitate bacterial copper uptake, potentiating the need for copper detoxification. During in vivo infection, staphylopine usage increased S. aureus susceptibility to host-mediated copper stress, indicating that the innate immune response can harness the antimicrobial potential of altered elemental abundances in host niches. Collectively, these observations show that while the broad-spectrum metal-chelating properties of metallophores can be advantageous, the host can exploit these properties to drive metal intoxication and mediate antibacterial control. IMPORTANCE During infection bacteria must overcome the dual threats of metal starvation and intoxication. This work reveals that the zinc-withholding response of the host sensitizes Staphylococcus aureus to copper intoxication. In response to zinc starvation S. aureus utilizes the metallophore staphylopine. The current work revealed that the host can leverage the promiscuity of staphylopine to intoxicate S. aureus during infection. Significantly, staphylopine-like metallophores are produced by a wide range of pathogens, suggesting that this is a conserved weakness that the host can leverage to toxify invaders with copper. Moreover, it challenges the assumption that the broad-spectrum metal binding of metallophores is inherently beneficial to bacteria.
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Affiliation(s)
- Saika Hossain
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Jacqueline R Morey
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, 3000, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, 3000, Australia
| | - Jana N Radin
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Javiera Norambuena
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ 08901, USA
| | - Jeffrey M Boyd
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, NJ 08901, USA
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, 3000, Australia
| | - Thomas E Kehl-Fie
- Department of Microbiology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
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13
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Dao TH, Iverson A, Neville SL, Johnson MDL, McDevitt CA, Rosch JW. The role of CopA in Streptococcus pyogenes copper homeostasis and virulence. J Inorg Biochem 2023; 240:112122. [PMID: 36639322 PMCID: PMC10161136 DOI: 10.1016/j.jinorgbio.2023.112122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/09/2023]
Abstract
Maintenance of intracellular metal homeostasis during interaction with host niches is critical to the success of bacterial pathogens. To prevent infection, the mammalian innate immune response employs metal-withholding and metal-intoxication mechanisms to limit bacterial propagation. The first-row transition metal ion copper serves critical roles at the host-pathogen interface and has been associated with antimicrobial activity since antiquity. Despite lacking any known copper-utilizing proteins, streptococci have been reported to accumulate significant levels of copper. Here, we report that loss of CopA, a copper-specific exporter, confers increased sensitivity to copper in Streptococcus pyogenes strain HSC5, with prolonged exposure to physiological levels of copper resulting in reduced viability during stationary phase cultivation. This defect in stationary phase survival was rescued by supplementation with exogeneous amino acids, indicating the pathogen had altered nutritional requirements during exposure to copper stress. Furthermore, S. pyogenes HSC5 ΔcopA was substantially attenuated during murine soft-tissue infection, demonstrating the importance of copper efflux at the host-pathogen interface. Collectively, these data indicate that copper can severely reduce the viability of stationary phase S. pyogenes and that active efflux mechanisms are required to survive copper stress in vitro and during infection.
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Affiliation(s)
- Tina H Dao
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Amy Iverson
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Michael D L Johnson
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA; Department of Immunobiology, BIO5 Institute, Valley Fever Center for Excellence, and Asthma and Airway Disease Research Center, University of Arizona College of Medicine - Tucson, Tucson, AZ 85724, USA
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Jason W Rosch
- St. Jude Children's Research Hospital, Department of Infectious Diseases, 262 Danny Thomas Place, Memphis, TN 38105, USA.
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14
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Maunders EA, Ngu DHY, Ganio K, Hossain SI, Lim BYJ, Leeming MG, Luo Z, Tan A, Deplazes E, Kobe B, McDevitt CA. The Impact of Chromate on Pseudomonas aeruginosa Molybdenum Homeostasis. Front Microbiol 2022; 13:903146. [PMID: 35685933 PMCID: PMC9171197 DOI: 10.3389/fmicb.2022.903146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 04/25/2022] [Indexed: 12/03/2022] Open
Abstract
Acquisition of the trace-element molybdenum via the high-affinity ATP-binding cassette permease ModABC is essential for Pseudomonas aeruginosa respiration in anaerobic and microaerophilic environments. This study determined the X-ray crystal structures of the molybdenum-recruiting solute-binding protein ModA from P. aeruginosa PAO1 in the metal-free state and bound to the group 6 metal oxyanions molybdate, tungstate, and chromate. Pseudomonas aeruginosa PAO1 ModA has a non-contiguous dual-hinged bilobal structure with a single metal-binding site positioned between the two domains. Metal binding results in a 22° relative rotation of the two lobes with the oxyanions coordinated by four residues, that contribute six hydrogen bonds, distinct from ModA orthologues that feature an additional oxyanion-binding residue. Analysis of 485 Pseudomonas ModA sequences revealed conservation of the metal-binding residues and β-sheet structural elements, highlighting their contribution to protein structure and function. Despite the capacity of ModA to bind chromate, deletion of modA did not affect P. aeruginosa PAO1 sensitivity to chromate toxicity nor impact cellular accumulation of chromate. Exposure to sub-inhibitory concentrations of chromate broadly perturbed P. aeruginosa metal homeostasis and, unexpectedly, was associated with an increase in ModA-mediated molybdenum uptake. Elemental analyses of the proteome from anaerobically grown P. aeruginosa revealed that, despite the increase in cellular molybdenum upon chromate exposure, distribution of the metal within the proteome was substantially perturbed. This suggested that molybdoprotein cofactor acquisition may be disrupted, consistent with the potent toxicity of chromate under anaerobic conditions. Collectively, these data reveal a complex relationship between chromate toxicity, molybdenum homeostasis and anaerobic respiration.
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Affiliation(s)
- Eve A. Maunders
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Dalton H. Y. Ngu
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Sheikh I. Hossain
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW, Australia
| | - Bryan Y. J. Lim
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Michael G. Leeming
- Melbourne Mass Spectrometry and Proteomics Facility, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, VIC, Australia
| | - Zhenyao Luo
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Aimee Tan
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Evelyne Deplazes
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW, Australia
| | - Boštjan Kobe
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
- Boštjan Kobe,
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
- *Correspondence: Christopher A. McDevitt,
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15
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Greenough MA, Lane DJR, Balez R, Anastacio HTD, Zeng Z, Ganio K, McDevitt CA, Acevedo K, Belaidi AA, Koistinaho J, Ooi L, Ayton S, Bush AI. Selective ferroptosis vulnerability due to familial Alzheimer’s disease presenilin mutations. Cell Death Differ 2022; 29:2123-2136. [PMID: 35449212 PMCID: PMC9613996 DOI: 10.1038/s41418-022-01003-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 04/05/2022] [Accepted: 04/05/2022] [Indexed: 12/24/2022] Open
Abstract
AbstractMutations in presenilin 1 and 2 (PS1 and PS2) cause autosomal dominant familial Alzheimer’s disease (FAD). Ferroptosis has been implicated as a mechanism of neurodegeneration in AD since neocortical iron burden predicts Alzheimer’s disease (AD) progression. We found that loss of the presenilins dramatically sensitizes multiple cell types to ferroptosis, but not apoptosis. FAD causal mutations of presenilins similarly sensitizes cells to ferroptosis. The presenilins promote the expression of GPX4, the selenoprotein checkpoint enzyme that blocks ferroptosis by quenching the membrane propagation of lethal hydroperoxyl radicals. Presenilin γ-secretase activity cleaves Notch-1 to signal LRP8 expression, which then controls GPX4 expression by regulating the supply of selenium into the cell since LRP8 is the uptake receptor for selenoprotein P. Selenium uptake is thus disrupted by presenilin FAD mutations, suppressing GPX4 expression. Therefore, presenilin mutations may promote neurodegeneration by derepressing ferroptosis, which has implications for disease-modifying therapeutics.
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16
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De Oliveira DMP, Keller B, Hayes AJ, Ong CLY, Harbison-Price N, El-Deeb IM, Li G, Keller N, Bohlmann L, Brouwer S, Turner AG, Cork AJ, Jones TR, Paterson DL, McEwan AG, Davies MR, McDevitt CA, von Itzstein M, Walker MJ. Neurodegenerative Disease Treatment Drug PBT2 Breaks Intrinsic Polymyxin Resistance in Gram-Positive Bacteria. Antibiotics (Basel) 2022; 11:antibiotics11040449. [PMID: 35453201 PMCID: PMC9027797 DOI: 10.3390/antibiotics11040449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/16/2022] [Accepted: 03/22/2022] [Indexed: 12/03/2022] Open
Abstract
Gram-positive bacteria do not produce lipopolysaccharide as a cell wall component. As such, the polymyxin class of antibiotics, which exert bactericidal activity against Gram-negative pathogens, are ineffective against Gram-positive bacteria. The safe-for-human-use hydroxyquinoline analog ionophore PBT2 has been previously shown to break polymyxin resistance in Gram-negative bacteria, independent of the lipopolysaccharide modification pathways that confer polymyxin resistance. Here, in combination with zinc, PBT2 was shown to break intrinsic polymyxin resistance in Streptococcus pyogenes (Group A Streptococcus; GAS), Staphylococcus aureus (including methicillin-resistant S. aureus), and vancomycin-resistant Enterococcus faecium. Using the globally disseminated M1T1 GAS strain 5448 as a proof of principle model, colistin in the presence of PBT2 + zinc was shown to be bactericidal in activity. Any resistance that did arise imposed a substantial fitness cost. PBT2 + zinc dysregulated GAS metal ion homeostasis, notably decreasing the cellular manganese content. Using a murine model of wound infection, PBT2 in combination with zinc and colistin proved an efficacious treatment against streptococcal skin infection. These findings provide a foundation from which to investigate the utility of PBT2 and next-generation polymyxin antibiotics for the treatment of Gram-positive bacterial infections.
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Affiliation(s)
- David M. P. De Oliveira
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Bernhard Keller
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Andrew J. Hayes
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC 3000, Australia; (A.J.H.); (M.R.D.); (C.A.M.)
| | - Cheryl-Lynn Y. Ong
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Nichaela Harbison-Price
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Ibrahim M. El-Deeb
- Institute for Glycomics, Griffith University, Gold Coast, QLD 4222, Australia; (I.M.E.-D.); (M.v.I.)
| | - Gen Li
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Nadia Keller
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Lisa Bohlmann
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Stephan Brouwer
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Andrew G. Turner
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Amanda J. Cork
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Thomas R. Jones
- School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia;
| | - David L. Paterson
- Australian Infectious Diseases Research Centre, UQ Centre for Clinical Research, The University of Queensland, Brisbane, QLD 4006, Australia;
| | - Alastair G. McEwan
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
| | - Mark R. Davies
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC 3000, Australia; (A.J.H.); (M.R.D.); (C.A.M.)
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC 3000, Australia; (A.J.H.); (M.R.D.); (C.A.M.)
| | - Mark von Itzstein
- Institute for Glycomics, Griffith University, Gold Coast, QLD 4222, Australia; (I.M.E.-D.); (M.v.I.)
| | - Mark J. Walker
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia; (D.M.P.D.O.); (B.K.); (C.-L.Y.O.); (N.H.-P.); (G.L.); (N.K.); (L.B.); (S.B.); (A.G.T.); (A.J.C.); (A.G.M.)
- Correspondence: ; Tel.: +61-7-33461623
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17
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Leiter O, Zhuo Z, Rust R, Wasielewska JM, Grönnert L, Kowal S, Overall RW, Adusumilli VS, Blackmore DG, Southon A, Ganio K, McDevitt CA, Rund N, Brici D, Mudiyan IA, Sykes AM, Rünker AE, Zocher S, Ayton S, Bush AI, Bartlett PF, Hou ST, Kempermann G, Walker TL. Selenium mediates exercise-induced adult neurogenesis and reverses learning deficits induced by hippocampal injury and aging. Cell Metab 2022; 34:408-423.e8. [PMID: 35120590 DOI: 10.1016/j.cmet.2022.01.005] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 10/01/2021] [Accepted: 01/11/2022] [Indexed: 12/24/2022]
Abstract
Although the neurogenesis-enhancing effects of exercise have been extensively studied, the molecular mechanisms underlying this response remain unclear. Here, we propose that this is mediated by the exercise-induced systemic release of the antioxidant selenium transport protein, selenoprotein P (SEPP1). Using knockout mouse models, we confirmed that SEPP1 and its receptor low-density lipoprotein receptor-related protein 8 (LRP8) are required for the exercise-induced increase in adult hippocampal neurogenesis. In vivo selenium infusion increased hippocampal neural precursor cell (NPC) proliferation and adult neurogenesis. Mimicking the effect of exercise through dietary selenium supplementation restored neurogenesis and reversed the cognitive decline associated with aging and hippocampal injury, suggesting potential therapeutic relevance. These results provide a molecular mechanism linking exercise-induced changes in the systemic environment to the activation of quiescent hippocampal NPCs and their subsequent recruitment into the neurogenic trajectory.
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Affiliation(s)
- Odette Leiter
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia; CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Zhan Zhuo
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia; Brain Research Centre and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Ruslan Rust
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Joanna M Wasielewska
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Lisa Grönnert
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Susann Kowal
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Rupert W Overall
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Vijay S Adusumilli
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Daniel G Blackmore
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia
| | - Adam Southon
- The Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Australia
| | - Nicole Rund
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - David Brici
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia
| | | | - Alexander M Sykes
- Max Planck Institute for Molecular Cell Biology and Genetics, Dresden, Germany
| | - Annette E Rünker
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Sara Zocher
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany
| | - Scott Ayton
- The Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Ashley I Bush
- The Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Perry F Bartlett
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia
| | - Sheng-Tao Hou
- Brain Research Centre and Department of Biology, Southern University of Science and Technology, Shenzhen, China.
| | - Gerd Kempermann
- CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany.
| | - Tara L Walker
- Queensland Brain Institute, The University of Queensland, Brisbane, Australia; CRTD - Center for Regenerative Therapies Dresden, Technische Universität Dresden, Dresden, Germany; German Center for Neurodegenerative Diseases (DZNE) Dresden, Dresden, Germany.
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18
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Betts HD, Neville SL, McDevitt CA, Sumby CJ, Harris HH. The biochemical fate of Ag + ions in Staphylococcus aureus, Escherichia coli, and biological media. J Inorg Biochem 2021; 225:111598. [PMID: 34517168 DOI: 10.1016/j.jinorgbio.2021.111598] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/03/2021] [Accepted: 08/28/2021] [Indexed: 01/16/2023]
Abstract
Silver is commonly included in a range of household and medical items to provide bactericidal action. Despite this, the chemical fate of the metal in both mammalian and bacterial systems remains poorly understood. Here, we applied a metallomics approach using X-ray absorption spectroscopy (XAS) and size-exclusion chromatography hyphenated with inductively coupled plasma mass spectrometry (SEC-ICP-MS) to advance our understanding of the biochemical fate of silver ions in bacterial culture and cells, and the chemistry associated with these interactions. When silver ions were added to lysogeny broth, silver was exclusively associated with moderately-sized species (~30 kDa) and bound by thiolate ligands. In two representative bacterial pathogens cultured in lysogeny broth including sub-lethal concentrations of ionic silver, silver was found in cells to be predominantly coordinated by thiolate species. The silver biomacromolecule-binding profile in Staphylococcus aureus and Escherichia coli was complex, with silver bound by a range of species spanning from 20 kDa to >1220 kDa. In bacterial cells, silver was nonuniformly colocalised with copper-bound proteins, suggesting that cellular copper processing may, in part, confuse silver for nutrient copper. Notably, in the treated cells, silver was not detected bound to low molecular weight compounds such as glutathione or bacillithiol.
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Affiliation(s)
- Harley D Betts
- Department of Chemistry, The University of Adelaide, South Australia 5005, Australia
| | - Stephanie L Neville
- The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Victoria 3000, Australia
| | - Christopher A McDevitt
- The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Victoria 3000, Australia
| | - Christopher J Sumby
- Department of Chemistry, The University of Adelaide, South Australia 5005, Australia
| | - Hugh H Harris
- Department of Chemistry, The University of Adelaide, South Australia 5005, Australia,.
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19
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Župan ML, Luo Z, Ganio K, Pederick VG, Neville SL, Deplazes E, Kobe B, McDevitt CA. Conformation of the Solute-Binding Protein AdcAII Influences Zinc Uptake in Streptococcus pneumoniae. Front Cell Infect Microbiol 2021; 11:729981. [PMID: 34490149 PMCID: PMC8416893 DOI: 10.3389/fcimb.2021.729981] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 07/27/2021] [Indexed: 01/13/2023] Open
Abstract
Streptococcus pneumoniae scavenges essential zinc ions from the host during colonization and infection. This is achieved by the ATP-binding cassette transporter, AdcCB, and two solute-binding proteins (SBPs), AdcA and AdcAII. It has been established that AdcAII serves a greater role during initial infection, but the molecular details of how the protein selectively acquires Zn(II) remain poorly understood. This can be attributed to the refractory nature of metal-free AdcAII to high-resolution structural determination techniques. Here, we overcome this issue by separately mutating the Zn(II)-coordinating residues and performing a combination of structural and biochemical analyses on the variant proteins. Structural analyses of Zn(II)-bound AdcAII variants revealed that specific regions within the protein underwent conformational changes via direct coupling to each of the metal-binding residues. Quantitative in vitro metal-binding assays combined with affinity determination and phenotypic growth assays revealed that each of the four Zn(II)-coordinating residues contributes to metal binding by AdcAII. Intriguingly, the phenotypic growth impact of the mutant adcAII alleles was, in general, independent of affinity, suggesting that the Zn(II)-bound conformation of the SBP is crucial for efficacious metal uptake. Collectively, these data highlight the intimate coupling of ligand affinity with protein conformational change in ligand-receptor proteins and provide a putative mechanism for AdcAII. These findings provide further mechanistic insight into the structural and functional diversity of SBPs that is broadly applicable to other prokaryotes.
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Affiliation(s)
- Marina L Župan
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Zhenyao Luo
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia.,Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia.,Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Victoria G Pederick
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, SA, Australia
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
| | - Evelyne Deplazes
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW, Australia.,School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, Bentley, WA, Australia
| | - Boštjan Kobe
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia.,Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia.,Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, Australia
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20
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Neville SL, Sjöhamn J, Watts JA, MacDermott-Opeskin H, Fairweather SJ, Ganio K, Hulyer AC, Hayes AJ, McGrath AP, Malcolm TR, Davies MR, Nomura N, So I, O'Mara ML, McDevitt CA, Maher MJ. The structure of the ABC transporter PsaBC shows that bacterial manganese import is achieved by unique architectural features that are conserved across the kingdoms of life. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321095799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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21
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Neville SL, Sjöhamn J, Watts JA, MacDermott-Opeskin H, Fairweather SJ, Ganio K, Carey Hulyer A, McGrath AP, Hayes AJ, Malcolm TR, Davies MR, Nomura N, Iwata S, O'Mara ML, Maher MJ, McDevitt CA. The structural basis of bacterial manganese import. Sci Adv 2021; 7:7/32/eabg3980. [PMID: 34362732 PMCID: PMC8346216 DOI: 10.1126/sciadv.abg3980] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 06/10/2021] [Indexed: 05/23/2023]
Abstract
Metal ions are essential for all forms of life. In prokaryotes, ATP-binding cassette (ABC) permeases serve as the primary import pathway for many micronutrients including the first-row transition metal manganese. However, the structural features of ionic metal transporting ABC permeases have remained undefined. Here, we present the crystal structure of the manganese transporter PsaBC from Streptococcus pneumoniae in an open-inward conformation. The type II transporter has a tightly closed transmembrane channel due to "extracellular gating" residues that prevent water permeation or ion reflux. Below these residues, the channel contains a hitherto unreported metal coordination site, which is essential for manganese translocation. Mutagenesis of the extracellular gate perturbs manganese uptake, while coordination site mutagenesis abolishes import. These structural features are highly conserved in metal-specific ABC transporters and are represented throughout the kingdoms of life. Collectively, our results define the structure of PsaBC and reveal the features required for divalent cation transport.
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Affiliation(s)
- Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Jennie Sjöhamn
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Jacinta A Watts
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | | | - Stephen J Fairweather
- Research School of Chemistry, Australian National University, Canberra, ACT, Australia
- Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Alex Carey Hulyer
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Aaron P McGrath
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Andrew J Hayes
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Tess R Malcolm
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, Victoria, Australia
| | - Mark R Davies
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Norimichi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Research Acceleration Program, Membrane Protein Crystallography Project, Japan Science and Technology Agency, Kyoto, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, Japan
| | - Megan L O'Mara
- Research School of Chemistry, Australian National University, Canberra, ACT, Australia
| | - Megan J Maher
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia.
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne, Victoria, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia.
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22
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De Oliveira DMP, Bohlmann L, Conroy T, Jen FEC, Everest-Dass A, Hansford KA, Bolisetti R, El-Deeb IM, Forde BM, Phan MD, Lacey JA, Tan A, Rivera-Hernandez T, Brouwer S, Keller N, Kidd TJ, Cork AJ, Bauer MJ, Cook GM, Davies MR, Beatson SA, Paterson DL, McEwan AG, Li J, Schembri MA, Blaskovich MAT, Jennings MP, McDevitt CA, von Itzstein M, Walker MJ. Repurposing a neurodegenerative disease drug to treat Gram-negative antibiotic-resistant bacterial sepsis. Sci Transl Med 2021; 12:12/570/eabb3791. [PMID: 33208501 DOI: 10.1126/scitranslmed.abb3791] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 10/30/2020] [Indexed: 12/15/2022]
Abstract
The emergence of polymyxin resistance in carbapenem-resistant and extended-spectrum β-lactamase (ESBL)-producing bacteria is a critical threat to human health, and alternative treatment strategies are urgently required. We investigated the ability of the hydroxyquinoline analog ionophore PBT2 to restore antibiotic sensitivity in polymyxin-resistant, ESBL-producing, carbapenem-resistant Gram-negative human pathogens. PBT2 resensitized Klebsiella pneumoniae, Escherichia coli, Acinetobacter baumannii, and Pseudomonas aeruginosa to last-resort polymyxin class antibiotics, including the less toxic next-generation polymyxin derivative FADDI-287, in vitro. We were unable to select for mutants resistant to PBT2 + FADDI-287 in polymyxin-resistant E. coli containing a plasmid-borne mcr-1 gene or K. pneumoniae carrying a chromosomal mgrB mutation. Using a highly invasive K. pneumoniae strain engineered for polymyxin resistance through mgrB mutation, we successfully demonstrated the efficacy of PBT2 + polymyxin (colistin or FADDI-287) for the treatment of Gram-negative sepsis in immunocompetent mice. In comparison to polymyxin alone, the combination of PBT2 + polymyxin improved survival and reduced bacterial dissemination to the lungs and spleen of infected mice. These data present a treatment modality to break antibiotic resistance in high-priority polymyxin-resistant Gram-negative pathogens.
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Affiliation(s)
- David M P De Oliveira
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Lisa Bohlmann
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Trent Conroy
- Institute for Glycomics, Griffith University, Queensland 4222, Australia
| | - Freda E-C Jen
- Institute for Glycomics, Griffith University, Queensland 4222, Australia
| | - Arun Everest-Dass
- Institute for Glycomics, Griffith University, Queensland 4222, Australia
| | - Karl A Hansford
- Centre for Superbug Solutions, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Raghu Bolisetti
- Centre for Superbug Solutions, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ibrahim M El-Deeb
- Institute for Glycomics, Griffith University, Queensland 4222, Australia
| | - Brian M Forde
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia.,Centre for Clinical Research and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4029, Australia
| | - Minh-Duy Phan
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Jake A Lacey
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Victoria 3000, Australia
| | - Aimee Tan
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Victoria 3000, Australia
| | - Tania Rivera-Hernandez
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia.,Consejo Nacional de Ciencia y Tecnología-Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades del Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City 06720, Mexico
| | - Stephan Brouwer
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Nadia Keller
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Timothy J Kidd
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Amanda J Cork
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Michelle J Bauer
- Centre for Clinical Research and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4029, Australia
| | - Gregory M Cook
- Department of Microbiology and Immunology, University of Otago, Dunedin 9016, New Zealand
| | - Mark R Davies
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Victoria 3000, Australia
| | - Scott A Beatson
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - David L Paterson
- Centre for Clinical Research and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4029, Australia
| | - Alastair G McEwan
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Jian Li
- Monash Biomedicine Discovery Institute, Monash University, Melbourne, Victoria 3800, Australia
| | - Mark A Schembri
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia
| | - Mark A T Blaskovich
- Centre for Superbug Solutions, Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Michael P Jennings
- Institute for Glycomics, Griffith University, Queensland 4222, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Victoria 3000, Australia
| | - Mark von Itzstein
- Institute for Glycomics, Griffith University, Queensland 4222, Australia
| | - Mark J Walker
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Queensland 4072, Australia.
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23
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Veltman T, Jordan D, McDevitt CA, Bell J, Howden BP, Valcanis M, O'Dea M, Abraham S, Scott P, Kovac JH, Chia R, Combs B, Chousalkar K, Wilson T, Trott DJ. Absence of high priority critically important antimicrobial resistance in Salmonella sp. isolated from Australian commercial egg layer environments. Int J Food Microbiol 2021; 340:109042. [PMID: 33461002 DOI: 10.1016/j.ijfoodmicro.2021.109042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 12/16/2020] [Accepted: 12/29/2020] [Indexed: 11/19/2022]
Abstract
The development of antimicrobial resistance in foodborne pathogens is a growing public health concern. This study was undertaken to determine the antimicrobial susceptibility of Salmonella enterica subspecies enterica isolated from the Australian commercial egg layer industry. S. enterica subspecies enterica (n=307) isolated from Australian commercial layer flock environments (2015-2018) were obtained from reference, research and State Government laboratories from six Australian states. All Salmonella isolates were serotyped. Antimicrobial susceptibility testing (AST) for 16 antimicrobial agents was performed by broth microdilution. Antimicrobial resistance genes and sequence types (STs) were identified in significant isolates by whole genome sequencing (WGS). Three main serotypes were detected, S. Typhimurium (n=61, 19.9%), S. Senftenburg (n=45, 14.7%) and S. Agona (n=37, 12.1%). AST showed 293/307 (95.4%) isolates were susceptible to all tested antimicrobial agents and all isolates were susceptible to amoxicillin-clavulanate, azithromycin, ceftiofur, ceftriaxone, ciprofloxacin, colistin, florfenicol, gentamicin, kanamycin and trimethoprim-sulfamethoxazole. Low levels of non-susceptibility were observed to streptomycin (2.3%, n=7), sulfisoxazole (2.0%, n=6), chloramphenicol (1.3%, n=4) and tetracycline (1.0%, n=3). Very low levels of non-susceptibility were observed to ampicillin (2/307; 0.7%) and cefoxitin (2/307; 0.7%). Two isolates (S. Havana and S. Montevideo), exhibited multidrug-resistant phenotypes to streptomycin, sulfisoxazole and tetracycline and possessed corresponding antimicrobial resistance genes (aadA4, aac(6')-Iaa, sul1, tetB). One S. Typhimurium isolate was resistant to ampicillin and tetracycline, and possessed both tetA and blaTEM-1B. WGS also identified these isolates as belonging to ST4 (S. Montevideo), ST578 (S. Havana) and ST19 (S. Typhimurium). The absence of resistance to highest priority critically important antimicrobials as well as the extremely low level of AMR generally among Australian commercial egg layer Salmonella isolates likely reflect Australia's conservative antimicrobial registration policy in food-producing animals and low rates of antimicrobial use within the industry.
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Affiliation(s)
- Tania Veltman
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, Australia; Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - David Jordan
- Department of Primary Industries, New South Wales Government, Wollongbar, Australia
| | - Christopher A McDevitt
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, Australia; Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Jan Bell
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, Australia; Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Benjamin P Howden
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne, The Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Mary Valcanis
- Microbiological Diagnostic Unit Public Health Laboratory, The University of Melbourne, The Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
| | - Mark O'Dea
- Antimicrobial Resistance and Infectious Diseases Laboratory, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Australia
| | - Sam Abraham
- Antimicrobial Resistance and Infectious Diseases Laboratory, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Australia
| | | | - Jessica H Kovac
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, Australia
| | | | - Barry Combs
- OzFoodNet, Communicable Disease Control Directorate, Perth, Australia
| | - Kapil Chousalkar
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, Australia
| | | | - Darren J Trott
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, Australia.
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24
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Neville SL, Eijkelkamp BA, Lothian A, Paton JC, Roberts BR, Rosch JW, McDevitt CA. Cadmium stress dictates central carbon flux and alters membrane composition in Streptococcus pneumoniae. Commun Biol 2020; 3:694. [PMID: 33214631 PMCID: PMC7678824 DOI: 10.1038/s42003-020-01417-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 10/23/2020] [Indexed: 12/12/2022] Open
Abstract
Metal ion homeostasis is essential for all forms of life. However, the breadth of intracellular impacts that arise upon dysregulation of metal ion homeostasis remain to be elucidated. Here, we used cadmium, a non-physiological metal ion, to investigate how the bacterial pathogen, Streptococcus pneumoniae, resists metal ion stress and dyshomeostasis. By combining transcriptomics, metabolomics and metalloproteomics, we reveal that cadmium stress dysregulates numerous essential cellular pathways including central carbon metabolism, lipid membrane biogenesis and homeostasis, and capsule production at the transcriptional and/or functional level. Despite the breadth of cellular pathways susceptible to metal intoxication, we show that S. pneumoniae is able to maintain viability by utilizing cellular pathways that are predominately metal-independent, such as the pentose phosphate pathway to maintain energy production. Collectively, this work provides insight into the cellular processes impacted by cadmium and how resistance to metal ion toxicity is achieved in S. pneumoniae. Neville et al. investigate how Streptococcus pneumoniae mitigates metal ion stress. Despite cadmium induced dysregulation of central carbon metabolism and lipid membrane homeostasis, they find that S. pneumoniae can remain viable by selectively utilizing predominately metal-independent cellular pathways. This study provides insights into how bacteria overcome metal ion toxicity.
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Affiliation(s)
- Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia.
| | - Bart A Eijkelkamp
- College of Science and Engineering, Flinders University, Bedford Park, SA, Australia
| | - Amber Lothian
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, University of Adelaide, Adelaide, SA, Australia
| | - Blaine R Roberts
- Melbourne Dementia Research Centre, The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, Australia.,Department of Biochemistry, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Jason W Rosch
- Department of Infectious Diseases, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia.
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25
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Yousuf S, Karlinsey JE, Neville SL, McDevitt CA, Libby SJ, Fang FC, Frawley ER. Manganese import protects Salmonella enterica serovar Typhimurium against nitrosative stress. Metallomics 2020; 12:1791-1801. [PMID: 33078811 DOI: 10.1039/d0mt00178c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Nitric oxide (NO˙) is a radical molecule produced by mammalian phagocytic cells as part of the innate immune response to bacterial pathogens. It exerts its antimicrobial activity in part by impairing the function of metalloproteins, particularly those containing iron and zinc cofactors. The pathogenic Gram-negative bacterium Salmonella enterica serovar typhimurium undergoes dynamic changes in its cellular content of the four most common metal cofactors following exposure to NO˙ stress. Zinc, iron and magnesium all decrease in response to NO˙ while cellular manganese increases significantly. Manganese acquisition is driven primarily by increased expression of the mntH and sitABCD transporters following derepression of MntR and Fur. ZupT also contributes to manganese acquisition in response to nitrosative stress. S. Typhimurium mutants lacking manganese importers are more sensitive to NO˙, indicating that manganese is important for resistance to nitrosative stress.
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Affiliation(s)
- Shehla Yousuf
- Rhodes College Biology Department, 2000 North Parkway, Memphis, TN 38112, USA.
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26
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Cooper VS, Honsa E, Rowe H, Deitrick C, Iverson AR, Whittall JJ, Neville SL, McDevitt CA, Kietzman C, Rosch JW. Experimental Evolution In Vivo To Identify Selective Pressures during Pneumococcal Colonization. mSystems 2020; 5:e00352-20. [PMID: 32398278 PMCID: PMC7219553 DOI: 10.1128/msystems.00352-20] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 04/30/2020] [Indexed: 12/20/2022] Open
Abstract
Experimental evolution is a powerful technique to understand how populations evolve from selective pressures imparted by the surrounding environment. With the advancement of whole-population genomic sequencing, it is possible to identify and track multiple contending genotypes associated with adaptations to specific selective pressures. This approach has been used repeatedly with model species in vitro, but only rarely in vivo Herein we report results of replicate experimentally evolved populations of Streptococcus pneumoniae propagated by repeated murine nasal colonization with the aim of identifying gene products under strong selection as well as the population genetic dynamics of infection cycles. Frameshift mutations in one gene, dltB, responsible for incorporation of d-alanine into teichoic acids on the bacterial surface, evolved repeatedly and swept to high frequency. Targeted deletions of dltB produced a fitness advantage during initial nasal colonization coupled with a corresponding fitness disadvantage in the lungs during pulmonary infection. The underlying mechanism behind the fitness trade-off between these two niches was found to be enhanced adherence to respiratory cells balanced by increased sensitivity to host-derived antimicrobial peptides, a finding recapitulated in the murine model. Additional mutations that are predicted to affect trace metal transport, central metabolism, and regulation of biofilm production and competence were also selected. These data indicate that experimental evolution can be applied to murine models of pathogenesis to gain insight into organism-specific tissue tropisms.IMPORTANCE Evolution is a powerful force that can be experimentally harnessed to gain insight into how populations evolve in response to selective pressures. Herein we tested the applicability of experimental evolutionary approaches to gain insight into how the major human pathogen Streptococcus pneumoniae responds to repeated colonization events using a murine model. These studies revealed the population dynamics of repeated colonization events and demonstrated that in vivo experimental evolution resulted in highly reproducible trajectories that reflect the environmental niche encountered during nasal colonization. Mutations impacting the surface charge of the bacteria were repeatedly selected during colonization and provided a fitness benefit in this niche that was counterbalanced by a corresponding fitness defect during lung infection. These data indicate that experimental evolution can be applied to models of pathogenesis to gain insight into organism-specific tissue tropisms.
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Affiliation(s)
- Vaughn S Cooper
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Erin Honsa
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Hannah Rowe
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Christopher Deitrick
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Center for Evolutionary Biology and Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Amy R Iverson
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Jonathan J Whittall
- Department of Molecular and Biomedical Science, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Stephanie L Neville
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria, Australia
| | - Colin Kietzman
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
| | - Jason W Rosch
- St. Jude Children's Research Hospital, Department of Infectious Diseases, Memphis, Tennessee, USA
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27
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Udagedara SR, La Porta DM, Spehar C, Purohit G, Hein MJA, Fatmous ME, Casas Garcia GP, Ganio K, McDevitt CA, Maher MJ. Structural and functional characterizations of the C-terminal domains of CzcD proteins. J Inorg Biochem 2020; 208:111087. [PMID: 32505855 DOI: 10.1016/j.jinorgbio.2020.111087] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 04/11/2020] [Accepted: 04/15/2020] [Indexed: 12/15/2022]
Abstract
Zinc is a potent antimicrobial component of the innate immune response at the host-pathogen interface. Bacteria subvert or resist host zinc insults by metal efflux pathways that include cation diffusion facilitator (CDF) proteins. The structural and functional examination of this protein class has been limited, with only the structures of the zinc transporter YiiP proteins from E. coli and Shewanella oneidensis described to date. Here, we determine the metal binding properties, solution quaternary structures and three dimensional architectures of the C-terminal domains of the metal transporter CzcD proteins from Cupriavidus metallidurans, Pseudomonas aeruginosa and Thermotoga maritima. We reveal significant diversity in the metal-binding properties and structures of these proteins and discover a potential novel mechanism for metal-promoted dimerization for the Cupriavidus metallidurans and Pseudomonas aeruginosa proteins.
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Affiliation(s)
- Saumya R Udagedara
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - Daniel M La Porta
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - Christian Spehar
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - Ghruta Purohit
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - Matthew J A Hein
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - Monique E Fatmous
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - G Patricia Casas Garcia
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia
| | - Katherine Ganio
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne 3000, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne 3000, Australia
| | - Megan J Maher
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3083, Australia; School of Chemistry, The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Melbourne 3010, Australia.
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28
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Harbison-Price N, Ferguson SA, Heikal A, Taiaroa G, Hards K, Nakatani Y, Rennison D, Brimble MA, El-Deeb IM, Bohlmann L, McDevitt CA, von Itzstein M, Walker MJ, Cook GM. Multiple Bactericidal Mechanisms of the Zinc Ionophore PBT2. mSphere 2020; 5:e00157-20. [PMID: 32188750 PMCID: PMC7082140 DOI: 10.1128/msphere.00157-20] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 02/29/2020] [Indexed: 12/21/2022] Open
Abstract
Globally, more antimicrobials are used in food-producing animals than in humans, and the extensive use of medically important human antimicrobials poses a significant public health threat in the face of rising antimicrobial resistance (AMR). The development of novel ionophores, a class of antimicrobials used exclusively in animals, holds promise as a strategy to replace or reduce essential human antimicrobials in veterinary practice. PBT2 is a zinc ionophore with recently demonstrated antibacterial activity against several Gram-positive pathogens, although the underlying mechanism of action is unknown. Here, we investigated the bactericidal mechanism of PBT2 in the bovine mastitis-causing pathogen, Streptococcus uberis In this work, we show that PBT2 functions as a Zn2+/H+ ionophore, exchanging extracellular zinc for intracellular protons in an electroneutral process that leads to cellular zinc accumulation. Zinc accumulation occurs concomitantly with manganese depletion and the production of reactive oxygen species (ROS). PBT2 inhibits the activity of the manganese-dependent superoxide dismutase, SodA, thereby impairing oxidative stress protection. We propose that PBT2-mediated intracellular zinc toxicity in S. uberis leads to lethality through multiple bactericidal mechanisms: the production of toxic ROS and the impairment of manganese-dependent antioxidant functions. Collectively, these data show that PBT2 represents a new class of antibacterial ionophores capable of targeting bacterial metal ion homeostasis and cellular redox balance. We propose that this novel and multitarget mechanism of PBT2 makes the development of cross-resistance to medically important antimicrobials unlikely.IMPORTANCE More antimicrobials are used in food-producing animals than in humans, and the extensive use of medically important human antimicrobials poses a significant public health threat in the face of rising antimicrobial resistance. Therefore, the elimination of antimicrobial crossover between human and veterinary medicine is of great interest. Unfortunately, the development of new antimicrobials is an expensive high-risk process fraught with difficulties. The repurposing of chemical agents provides a solution to this problem, and while many have not been originally developed as antimicrobials, they have been proven safe in clinical trials. PBT2, a zinc ionophore, is an experimental therapeutic that met safety criteria but failed efficacy checkpoints against both Alzheimer's and Huntington's diseases. It was recently found that PBT2 possessed potent antimicrobial activity, although the mechanism of bacterial cell death is unresolved. In this body of work, we show that PBT2 has multiple mechanisms of antimicrobial action, making the development of PBT2 resistance unlikely.
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Affiliation(s)
| | - Scott A Ferguson
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Adam Heikal
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - George Taiaroa
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Kiel Hards
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Yoshio Nakatani
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - David Rennison
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Margaret A Brimble
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | | | - Lisa Bohlmann
- School of Chemistry and Molecular Biosciences, Australian Infectious Diseases Research Centre, The University of Queensland, Queensland, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | | | - Mark J Walker
- School of Chemistry and Molecular Biosciences, Australian Infectious Diseases Research Centre, The University of Queensland, Queensland, Australia
| | - Gregory M Cook
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
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29
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MacDermott-Opeskin H, McDevitt CA, O'Mara ML. Comparing Nonbonded Metal Ion Models in the Divalent Cation Binding Protein PsaA. J Chem Theory Comput 2020; 16:1913-1923. [PMID: 32059108 DOI: 10.1021/acs.jctc.9b01180] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Divalent metal cations are essential for many biological processes; however, accurately modeling divalent metal ions has proved a significant challenge for molecular dynamics force fields. Here we show that the choice of ion model influences the observed dynamics in PsaA, a metal binding protein from Streptococcus pneumoniae. We conduct extensive unbiased simulations and free energy calculations of PsaA bound to its cognate ligand Mn2+ and inhibitory ligand Zn2+ using three nonbonded ion models: a 12-6 model, a 12-6-4 model, and a multisite model. The observed coordination geometries and metal binding dynamics are sensitive to the choice of ion model, with the most dramatic differences observed in free energy calculations of ion release. We show that the conformational ensemble of Mn-bound PsaA is more similar to the crystallographic metal bound open state. This work extends the current model of PsaA metal binding and provides a framework for the rationalization of experimentally determined metal binding behavior. Our findings support the use of the 12-6-4 ion model for further simulations of divalent cation binding proteins.
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Affiliation(s)
- Hugo MacDermott-Opeskin
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, Victoria 3000, Australia
| | - Megan L O'Mara
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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30
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Alquethamy SF, Adams FG, Naidu V, Khorvash M, Pederick VG, Zang M, Paton JC, Paulsen IT, Hassan KA, Cain AK, McDevitt CA, Eijkelkamp BA. The Role of Zinc Efflux during Acinetobacter baumannii Infection. ACS Infect Dis 2020; 6:150-158. [PMID: 31658418 DOI: 10.1021/acsinfecdis.9b00351] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Acinetobacter baumannii is a ubiquitous Gram-negative bacterium, that is associated with significant disease in immunocompromised individuals. The success of A. baumannii is partly attributable to its high level of antibiotic resistance. Further, A. baumannii expresses a broad arsenal of putative zinc efflux systems that are likely to aid environmental persistence and host colonization, but detailed insights into how the bacterium deals with toxic concentrations of zinc are lacking. In this study we present the transcriptomic responses of A. baumannii to toxic zinc concentrations. Subsequent mutant analyses revealed a primary role for the resistance-nodulation-cell division heavy metal efflux system CzcCBA, and the cation diffusion facilitator transporter CzcD in zinc resistance. To examine the role of zinc at the host-pathogen interface we utilized a murine model of zinc deficiency and challenge with wild-type and czcA mutant strains, which identified highly site-specific roles for zinc during A. baumannii infection. Overall, we provide novel insight into the key zinc resistance mechanisms of A. baumannii and outline the role these systems play in enabling the bacterium to survive in diverse environments.
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Affiliation(s)
- Saleh F. Alquethamy
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Elizabeth Street, Melbourne, Victoria 3000, Australia
| | - Felise G. Adams
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
- College of Science and Engineering, Flinders University, Sturt Road, Bedford Park, South Australia 5042, Australia
| | - Varsha Naidu
- Department of Molecular Sciences, Macquarie University, Balaclava Road, Macquarie Park, New South Wales 2109, Australia
| | - Marjan Khorvash
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Victoria G. Pederick
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Maoge Zang
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - James C. Paton
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Ian T. Paulsen
- Department of Molecular Sciences, Macquarie University, Balaclava Road, Macquarie Park, New South Wales 2109, Australia
| | - Karl A. Hassan
- School of Environmental and Life Sciences, University of Newcastle, University Drive, Callaghan, New South Wales 2308, Australia
| | - Amy K. Cain
- Department of Molecular Sciences, Macquarie University, Balaclava Road, Macquarie Park, New South Wales 2109, Australia
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Elizabeth Street, Melbourne, Victoria 3000, Australia
| | - Bart A. Eijkelkamp
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
- College of Science and Engineering, Flinders University, Sturt Road, Bedford Park, South Australia 5042, Australia
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31
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Eijkelkamp BA, Morey JR, Neville SL, Tan A, Pederick VG, Cole N, Singh PP, Ong CLY, Gonzalez de Vega R, Clases D, Cunningham BA, Hughes CE, Comerford I, Brazel EB, Whittall JJ, Plumptre CD, McColl SR, Paton JC, McEwan AG, Doble PA, McDevitt CA. Dietary zinc and the control of Streptococcus pneumoniae infection. PLoS Pathog 2019; 15:e1007957. [PMID: 31437249 PMCID: PMC6705770 DOI: 10.1371/journal.ppat.1007957] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 07/03/2019] [Indexed: 12/21/2022] Open
Abstract
Human zinc deficiency increases susceptibility to bacterial infection. Although zinc supplementation therapies can reduce the impact of disease, the molecular basis for protection remains unclear. Streptococcus pneumoniae is a major cause of bacterial pneumonia, which is prevalent in regions of zinc deficiency. We report that dietary zinc levels dictate the outcome of S. pneumoniae infection in a murine model. Dietary zinc restriction impacts murine tissue zinc levels with distribution post-infection altered, and S. pneumoniae virulence and infection enhanced. Although the activation and infiltration of murine phagocytic cells was not affected by zinc restriction, their efficacy of bacterial control was compromised. S. pneumoniae was shown to be highly sensitive to zinc intoxication, with this process impaired in zinc restricted mice and isolated phagocytic cells. Collectively, these data show how dietary zinc deficiency increases sensitivity to S. pneumoniae infection while revealing a role for zinc as a component of host antimicrobial defences. Zinc deficiency affects one-third of the world’s population and is associated with an increased susceptibility to bacterial infection. Despite this, the molecular basis for how zinc deficiency compromises host control of infection remains to be understood. We show that dietary zinc deficiency impacts host tissue zinc abundances and its mobilization during infection by the major respiratory pathogen Streptococcus pneumoniae. Zinc acts as a direct antimicrobial against the pathogen, mobilized by phagocytic cells as a component of the innate immune response. Although immune activation and infiltration of phagocytic cells is unaffected by host zinc status, the lack of antimicrobial zinc compromises bacterial control in zinc deficient hosts. These findings highlight the importance of zinc sufficiency in resisting bacterial infection.
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Affiliation(s)
- Bart A Eijkelkamp
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Jacqueline R Morey
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Stephanie L Neville
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia.,Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Aimee Tan
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Victoria G Pederick
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Nerida Cole
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia.,ARC Training Centre in Biodevices, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, Australia
| | - Prashina P Singh
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - Cheryl-Lynn Y Ong
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Raquel Gonzalez de Vega
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - David Clases
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - Bliss A Cunningham
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
| | - Catherine E Hughes
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Iain Comerford
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Erin B Brazel
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Jonathan J Whittall
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Charles D Plumptre
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Shaun R McColl
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Alastair G McEwan
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia
| | - Philip A Doble
- The Atomic Medicine Initiative, University of Technology, Broadway, Sydney, New South Wales, Australia
| | - Christopher A McDevitt
- Department of Molecular and Biomedical Science, School of Biological Sciences, The University of Adelaide, Adelaide, Australia.,Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia
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Monk IR, Shaikh N, Begg SL, Gajdiss M, Sharkey LKR, Lee JYH, Pidot SJ, Seemann T, Kuiper M, Winnen B, Hvorup R, Collins BM, Bierbaum G, Udagedara SR, Morey JR, Pulyani N, Howden BP, Maher MJ, McDevitt CA, King GF, Stinear TP. Zinc-binding to the cytoplasmic PAS domain regulates the essential WalK histidine kinase of Staphylococcus aureus. Nat Commun 2019; 10:3067. [PMID: 31296851 PMCID: PMC6624279 DOI: 10.1038/s41467-019-10932-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 06/05/2019] [Indexed: 01/23/2023] Open
Abstract
WalKR (YycFG) is the only essential two-component regulator in the human pathogen Staphylococcus aureus. WalKR regulates peptidoglycan synthesis, but this function alone does not explain its essentiality. Here, to further understand WalKR function, we investigate a suppressor mutant that arose when WalKR activity was impaired; a histidine to tyrosine substitution (H271Y) in the cytoplasmic Per-Arnt-Sim (PASCYT) domain of the histidine kinase WalK. Introducing the WalKH271Y mutation into wild-type S. aureus activates the WalKR regulon. Structural analyses of the WalK PASCYT domain reveal a metal-binding site, in which a zinc ion (Zn2+) is tetrahedrally-coordinated by four amino acids including H271. The WalKH271Y mutation abrogates metal binding, increasing WalK kinase activity and WalR phosphorylation. Thus, Zn2+-binding negatively regulates WalKR. Promoter-reporter experiments using S. aureus confirm Zn2+ sensing by this system. Identification of a metal ligand recognized by the WalKR system broadens our understanding of this critical S. aureus regulon.
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Affiliation(s)
- Ian R Monk
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia.
| | - Nausad Shaikh
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD, 4067, Australia
| | - Stephanie L Begg
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia
| | - Mike Gajdiss
- University Clinics of Bonn, Institute of Medical Microbiology, Immunology and Parasitology, 53127, Bonn, Germany
| | - Liam K R Sharkey
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia
| | - Jean Y H Lee
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia
| | - Sacha J Pidot
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia
| | - Torsten Seemann
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia.,Melbourne Bioinformatics, University of Melbourne, Melbourne, VIC, 3000, Australia
| | | | | | - Rikki Hvorup
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD, 4067, Australia
| | - Brett M Collins
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD, 4067, Australia
| | - Gabriele Bierbaum
- University Clinics of Bonn, Institute of Medical Microbiology, Immunology and Parasitology, 53127, Bonn, Germany
| | - Saumya R Udagedara
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Jacqueline R Morey
- Department of Molecular and Biomedical Sciences, School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Neha Pulyani
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Benjamin P Howden
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia
| | - Megan J Maher
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia.,Department of Molecular and Biomedical Sciences, School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Glenn F King
- Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD, 4067, Australia
| | - Timothy P Stinear
- Department of Microbiology and Immunology, Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, VIC, 3000, Australia.
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33
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de Boer M, Gouridis G, Vietrov R, Begg SL, Schuurman-Wolters GK, Husada F, Eleftheriadis N, Poolman B, McDevitt CA, Cordes T. Conformational and dynamic plasticity in substrate-binding proteins underlies selective transport in ABC importers. eLife 2019; 8:44652. [PMID: 30900991 PMCID: PMC6450668 DOI: 10.7554/elife.44652] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 03/22/2019] [Indexed: 12/20/2022] Open
Abstract
Substrate-binding proteins (SBPs) are associated with ATP-binding cassette importers and switch from an open to a closed conformation upon substrate binding, providing specificity for transport. We investigated the effect of substrates on the conformational dynamics of six SBPs and the impact on transport. Using single-molecule FRET, we reveal an unrecognized diversity of plasticity in SBPs. We show that a unique closed SBP conformation does not exist for transported substrates. Instead, SBPs sample a range of conformations that activate transport. Certain non-transported ligands leave the structure largely unaltered or trigger a conformation distinct from that of transported substrates. Intriguingly, in some cases, similar SBP conformations are formed by both transported and non-transported ligands. In this case, the inability for transport arises from slow opening of the SBP or the selectivity provided by the translocator. Our results reveal the complex interplay between ligand-SBP interactions, SBP conformational dynamics and substrate transport.
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Affiliation(s)
- Marijn de Boer
- Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Giorgos Gouridis
- Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.,Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany.,Laboratory of Molecular Bacteriology, Department of Microbiology and Immunology, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium
| | - Ruslan Vietrov
- Department of Biochemistry, Groningen Biomolecular Science and Biotechnology Institute, University of Groningen, Groningen, The Netherlands.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Stephanie L Begg
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia
| | - Gea K Schuurman-Wolters
- Department of Biochemistry, Groningen Biomolecular Science and Biotechnology Institute, University of Groningen, Groningen, The Netherlands.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Florence Husada
- Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Nikolaos Eleftheriadis
- Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Bert Poolman
- Department of Biochemistry, Groningen Biomolecular Science and Biotechnology Institute, University of Groningen, Groningen, The Netherlands.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Christopher A McDevitt
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Australia.,Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, Australia
| | - Thorben Cordes
- Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.,Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany
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34
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Sikanyika M, Aragão D, McDevitt CA, Maher MJ. The structure and activity of the glutathione reductase from Streptococcus pneumoniae. Acta Crystallogr F Struct Biol Commun 2019; 75:54-61. [PMID: 30605126 PMCID: PMC6317452 DOI: 10.1107/s2053230x18016527] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 11/20/2018] [Indexed: 11/11/2022] Open
Abstract
The glutathione reductase (GR) from Streptococcus pneumoniae is a flavoenzyme that catalyzes the reduction of oxidized glutathione (GSSG) to its reduced form (GSH) in the cytoplasm of this bacterium. The maintenance of an intracellular pool of GSH is critical for the detoxification of reactive oxygen and nitrogen species and for intracellular metal tolerance to ions such as zinc. Here, S. pneumoniae GR (SpGR) was overexpressed and purified and its crystal structure determined at 2.56 Å resolution. SpGR shows overall structural similarity to other characterized GRs, with a dimeric structure that includes an antiparallel β-sheet at the dimer interface. This observation, in conjunction with comparisons with the interface structures of other GR enzymes, allows the classification of these enzymes into three classes. Analyses of the kinetic properties of SpGR revealed a significantly higher value for Km(GSSG) (231.2 ± 24.7 µM) in comparison to other characterized GR enzymes.
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Affiliation(s)
- Mwilye Sikanyika
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
| | - David Aragão
- Australian Synchrotron, Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Christopher A. McDevitt
- Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria 3000, Australia
| | - Megan J. Maher
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia
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35
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Bohlmann L, De Oliveira DMP, El-Deeb IM, Brazel EB, Harbison-Price N, Ong CLY, Rivera-Hernandez T, Ferguson SA, Cork AJ, Phan MD, Soderholm AT, Davies MR, Nimmo GR, Dougan G, Schembri MA, Cook GM, McEwan AG, von Itzstein M, McDevitt CA, Walker MJ. Chemical Synergy between Ionophore PBT2 and Zinc Reverses Antibiotic Resistance. mBio 2018; 9:e02391-18. [PMID: 30538186 PMCID: PMC6299484 DOI: 10.1128/mbio.02391-18] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 11/05/2018] [Indexed: 11/20/2022] Open
Abstract
The World Health Organization reports that antibiotic-resistant pathogens represent an imminent global health disaster for the 21st century. Gram-positive superbugs threaten to breach last-line antibiotic treatment, and the pharmaceutical industry antibiotic development pipeline is waning. Here we report the synergy between ionophore-induced physiological stress in Gram-positive bacteria and antibiotic treatment. PBT2 is a safe-for-human-use zinc ionophore that has progressed to phase 2 clinical trials for Alzheimer's and Huntington's disease treatment. In combination with zinc, PBT2 exhibits antibacterial activity and disrupts cellular homeostasis in erythromycin-resistant group A Streptococcus (GAS), methicillin-resistant Staphylococcus aureus (MRSA), and vancomycin-resistant Enterococcus (VRE). We were unable to select for mutants resistant to PBT2-zinc treatment. While ineffective alone against resistant bacteria, several clinically relevant antibiotics act synergistically with PBT2-zinc to enhance killing of these Gram-positive pathogens. These data represent a new paradigm whereby disruption of bacterial metal homeostasis reverses antibiotic-resistant phenotypes in a number of priority human bacterial pathogens.IMPORTANCE The rise of bacterial antibiotic resistance coupled with a reduction in new antibiotic development has placed significant burdens on global health care. Resistant bacterial pathogens such as methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus are leading causes of community- and hospital-acquired infection and present a significant clinical challenge. These pathogens have acquired resistance to broad classes of antimicrobials. Furthermore, Streptococcus pyogenes, a significant disease agent among Indigenous Australians, has now acquired resistance to several antibiotic classes. With a rise in antibiotic resistance and reduction in new antibiotic discovery, it is imperative to investigate alternative therapeutic regimens that complement the use of current antibiotic treatment strategies. As stated by the WHO Director-General, "On current trends, common diseases may become untreatable. Doctors facing patients will have to say, Sorry, there is nothing I can do for you."
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Affiliation(s)
- Lisa Bohlmann
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - David M P De Oliveira
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Ibrahim M El-Deeb
- Institute for Glycomics, Griffith University, Brisbane, QLD, Australia
| | - Erin B Brazel
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | | | - Cheryl-Lynn Y Ong
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Tania Rivera-Hernandez
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Scott A Ferguson
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Amanda J Cork
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Minh-Duy Phan
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Amelia T Soderholm
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Mark R Davies
- Department of Microbiology and Immunology at the Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia
| | - Graeme R Nimmo
- Pathology Queensland Central Laboratory, Brisbane, QLD, Australia
| | - Gordon Dougan
- Wellcome Trust Sanger Institute, Hinxton, United Kingdom
| | - Mark A Schembri
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Gregory M Cook
- Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand
| | - Alastair G McEwan
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
| | - Mark von Itzstein
- Institute for Glycomics, Griffith University, Brisbane, QLD, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Mark J Walker
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, QLD, Australia
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36
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Zhang X, Heng S, Pei J, Morey JR, McDevitt CA, Abell AD. A Liposomal Platform for Sensing of Extracellular Analytes Near Cells. Biosensors (Basel) 2018; 8:bios8040117. [PMID: 30486256 PMCID: PMC6315562 DOI: 10.3390/bios8040117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 11/20/2018] [Accepted: 11/21/2018] [Indexed: 01/09/2023]
Abstract
Cell-permeable fluorescent chemosensors (calcein, monochlorobimane, and a recently reported spiropyran-based sensor SP2) have been incorporated into yeast total lipid extract-based liposomes to suppress inherent cell permeability to allow the detection of extracellular Ca2+, GSH, and Zn2+, respectively. The repurposed sensors have enhanced aqueous solubility and the ability to quantitatively measure biologically relevant concentrations of Ca2+ (0.25 mM–1 mM), Zn2+ (6.25 µM–50 µM), and GSH (0.25 mM–1 mM) by fluorescence in aqueous media. In addition, the liposomal sensors are nontoxic to HEK293 cells and have the ability to detect exogenously added Zn2+ (1 mM), Ca2+ (1 mM), or GSH (1 mM) near cells without internalisation. This new sensing platform provides a means to repurpose a range of intracellular fluorescent sensors to specifically detect extracellular analytes, while also improving biocompatibility for overall enhanced use in a wide range of biomedical applications.
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Affiliation(s)
- Xiaozhou Zhang
- ARC Centre of Excellence for Nanoscale BioPhotonics, Institute of Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide, Adelaide SA 5005, Australia.
| | - Sabrina Heng
- ARC Centre of Excellence for Nanoscale BioPhotonics, Institute of Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide, Adelaide SA 5005, Australia.
| | - Jinxin Pei
- ARC Centre of Excellence for Nanoscale BioPhotonics, Institute of Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide, Adelaide SA 5005, Australia.
- Discipline of Physiology, Faculty of Health Sciences, The University of Adelaide, Adelaide SA 5005, Australia.
| | - Jacqueline R Morey
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide SA 5005, Australia.
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide SA 5005, Australia.
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne VIC 3010, Australia.
| | - Andrew D Abell
- ARC Centre of Excellence for Nanoscale BioPhotonics, Institute of Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide, Adelaide SA 5005, Australia.
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37
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Young RJ, Begg SL, Coghlan CJ, McDevitt CA, Sumby CJ. Exploring the Use of Structure and Polymer Incorporation to Tune Silver Ion Release and Antibacterial Activity of Silver Coordination Polymers. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800640] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Rosemary J. Young
- Department of Chemistry and the Centre for Advanced Nanomaterials; School of Physical Sciences; University of Adelaide; 5005 Adelaide South Australia Australia
| | - Stephanie L. Begg
- Research Centre for Infectious Diseases; School of Biological Sciences; University of Adelaide; 5005 Adelaide South Australia Australia
| | - Campbell J. Coghlan
- Department of Chemistry and the Centre for Advanced Nanomaterials; School of Physical Sciences; University of Adelaide; 5005 Adelaide South Australia Australia
| | - Christopher A. McDevitt
- Research Centre for Infectious Diseases; School of Biological Sciences; University of Adelaide; 5005 Adelaide South Australia Australia
| | - Christopher J. Sumby
- Department of Chemistry and the Centre for Advanced Nanomaterials; School of Physical Sciences; University of Adelaide; 5005 Adelaide South Australia Australia
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38
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Kidsley AK, Abraham S, Bell JM, O'Dea M, Laird TJ, Jordan D, Mitchell P, McDevitt CA, Trott DJ. Antimicrobial Susceptibility of Escherichia coli and Salmonella spp. Isolates From Healthy Pigs in Australia: Results of a Pilot National Survey. Front Microbiol 2018; 9:1207. [PMID: 30038598 PMCID: PMC6047343 DOI: 10.3389/fmicb.2018.01207] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 05/17/2018] [Indexed: 02/01/2023] Open
Abstract
This study investigated the frequency of antimicrobial non-susceptibility (defined as the frequency of isolates with minimum inhibitory concentrations above the CLSI susceptible clinical breakpoint) among E. coli and Salmonella spp. isolated from healthy Australian finisher pigs. E. coli (n = 201) and Salmonella spp. (n = 69) were isolated from cecal contents of slaughter-age pigs, originating from 19 farms distributed throughout Australia during July-December 2015. Isolates underwent minimum inhibitory concentration (MIC) susceptibility testing to 11 antimicrobials. The highest frequencies of non-susceptibility among respective isolates of E. coli and Salmonella spp. were to ampicillin (60.2 and 20.3%), tetracycline (68.2 and 26.1%), chloramphenicol (47.8 and 7.3%), and trimethoprim/sulfamethoxazole (33.8 and 11.6%). Four E. coli isolates had MICs above the wild-type epidemiological cut-off value for ciprofloxacin, with two isolates from the same farm classified as clinically resistant (MICs of > 4 μg/ml), a noteworthy finding given that fluoroquinolones (FQs) are not legally available for use in Australian food-producing animals. Three of these four E. coli isolates belonged to the sequence type (ST) 10, which has been isolated from both humans and production animals, whilst one isolate belonged to a new ST (7573) and possessed qnrS1. This study shows that non-susceptibility to first line antimicrobials is common among E. coli and Salmonella spp. isolates from healthy slaughter age pigs in Australia. However, very low levels of non-susceptibility to critically important antimicrobials (CIAs), namely third generation cephalosporins and fluoroquinolones were observed. Nevertheless, the isolation of two ciprofloxacin-resistant E. coli isolates from Australian pigs demonstrates that even in the absence of local antimicrobial selection pressure, fluoroquinolone-resistant E. coli clonal lineages may enter livestock production facilities despite strict biosecurity.
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Affiliation(s)
- Amanda K. Kidsley
- School of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, SA, Australia
- Australian Centre for Antimicrobial Resistance Ecology, University of Adelaide, Adelaide, SA, Australia
| | - Sam Abraham
- Antimicrobial Resistance and Infectious Diseases Laboratory, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, Australia
| | - Jan M. Bell
- Australian Centre for Antimicrobial Resistance Ecology, University of Adelaide, Adelaide, SA, Australia
| | - Mark O'Dea
- Antimicrobial Resistance and Infectious Diseases Laboratory, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, Australia
| | - Tanya J. Laird
- Antimicrobial Resistance and Infectious Diseases Laboratory, School of Veterinary and Life Sciences, Murdoch University, Perth, WA, Australia
| | - David Jordan
- New South Wales Department of Primary Industries, Wollongbar, NSW, Australia
| | - Pat Mitchell
- Australian Pork Limited, Canberra, ACT, Australia
| | - Christopher A. McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Darren J. Trott
- School of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, SA, Australia
- Australian Centre for Antimicrobial Resistance Ecology, University of Adelaide, Adelaide, SA, Australia
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39
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Luo Z, Pederick VG, Paton JC, McDevitt CA, Kobe B. Structural characterisation of the HT3 motif of the polyhistidine triad protein D from Streptococcus pneumoniae. FEBS Lett 2018; 592:2341-2350. [PMID: 29856892 DOI: 10.1002/1873-3468.13122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 05/11/2018] [Accepted: 05/21/2018] [Indexed: 01/12/2023]
Abstract
The bacterium Streptococcus pneumoniae (the pneumococcus) is a major human pathogen that requires Zn2+ for its survival and virulence in the host environment. Polyhistidine triad protein D (PhtD) has a known role in pneumococcal Zn2+ homeostasis. However, the mechanistic basis of PhtD function remains unclear, partly due to a lack of structural information. Here, we determined the crystal structure of the fragment PhtD269-339 , containing the third Zn2+ -binding histidine triad (HT) motif of the protein. Analysis of the structure suggests that Zn2+ binding occurs at the surface of the protein and that all five HT motifs in the protein bind Zn2+ and share similar structures. These new structural insights aid in our understanding of how the Pht proteins facilitate pneumococcal Zn2+ acquisition.
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Affiliation(s)
- Zhenyao Luo
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia.,Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland, Australia.,Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia
| | - Victoria G Pederick
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - Bostjan Kobe
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland, Australia.,Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland, Australia.,Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia
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40
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Eijkelkamp BA, Begg SL, Pederick VG, Trapetti C, Gregory MK, Whittall JJ, Paton JC, McDevitt CA. Arachidonic Acid Stress Impacts Pneumococcal Fatty Acid Homeostasis. Front Microbiol 2018; 9:813. [PMID: 29867785 PMCID: PMC5958418 DOI: 10.3389/fmicb.2018.00813] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 04/10/2018] [Indexed: 12/21/2022] Open
Abstract
Free fatty acids hold dual roles during infection, serving to modulate the host immune response while also functioning directly as antimicrobials. Of particular importance are the long chain polyunsaturated fatty acids, which are not commonly found in bacterial organisms, that have been proposed to have antibacterial roles. Arachidonic acid (AA) is a highly abundant long chain polyunsaturated fatty acid and we examined its effect upon Streptococcus pneumoniae. Here, we observed that in a murine model of S. pneumoniae infection the concentration of AA significantly increases in the blood. The impact of AA stress upon the pathogen was then assessed by a combination of biochemical, biophysical and microbiological assays. In vitro bacterial growth and intra-macrophage survival assays revealed that AA has detrimental effects on pneumococcal fitness. Subsequent analyses demonstrated that AA exerts antimicrobial activity via insertion into the pneumococcal membrane, although this did not increase the susceptibility of the bacterium to antibiotic, oxidative or metal ion stress. Transcriptomic profiling showed that AA treatment also resulted in a dramatic down-regulation of the genes involved in fatty acid biosynthesis, in addition to impacts on other metabolic processes, such as carbon-source utilization. Hence, these data reveal that AA has two distinct mechanisms of perturbing the pneumococcal membrane composition. Collectively, this work provides a molecular basis for the antimicrobial contribution of AA to combat pneumococcal infections.
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Affiliation(s)
- Bart A Eijkelkamp
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Stephanie L Begg
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Victoria G Pederick
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Claudia Trapetti
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Melissa K Gregory
- Adelaide Medical School, University of Adelaide, Adelaide, SA, Australia
| | - Jonathan J Whittall
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
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41
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Ryan TM, Trewhella J, Murphy JM, Keown JR, Casey L, Pearce FG, Goldstone DC, Chen K, Luo Z, Kobe B, McDevitt CA, Watkin SA, Hawley AM, Mudie ST, Samardzic Boban V, Kirby N. An optimized SEC-SAXS system enabling high X-ray dose for rapid SAXS assessment with correlated UV measurements for biomolecular structure analysis. J Appl Crystallogr 2018. [DOI: 10.1107/s1600576717017101] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A new optimized size exclusion chromatography small-angle X-ray scattering (SEC-SAXS) system for biomolecular SAXS at the Australian Synchrotron SAXS/WAXS beamline has been developed. The compact configuration reduces sample dilution to maximize sensitivity. Coflow sample presentation allows an 11-fold increase in flux on sample without capillary fouling, improving throughput and data quality, which are now primarily limited by the full flux available on the beamline. Multi-wavelength fibre optic UV analysis in close proximity to the X-ray beam allows for accurate concentration determination for samples with known UV extinction coefficients and thus estimation of the molecular weight of the scattering particle from the forward X-ray scattering intensity. Fast-flow low-volume SEC columns provide sample throughput competitive with batch concentration series measurements, albeit with a concomitant reduction of potential resolution relative to lower flow rates and larger SEC columns. The performance of the system is demonstrated using a set of model proteins, and its utility to solve various challenges is illustrated with a diverse suite of protein samples. These developments increase the quality and rigor of SEC-SAXS analysis and open new avenues for biomolecular solution SEC-SAXS studies that have been challenged by low sample yields, temporal instability, radiation sensitivity and complex mixtures.
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42
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Grim KP, San Francisco B, Radin JN, Brazel EB, Kelliher JL, Párraga Solórzano PK, Kim PC, McDevitt CA, Kehl-Fie TE. The Metallophore Staphylopine Enables Staphylococcus aureus To Compete with the Host for Zinc and Overcome Nutritional Immunity. mBio 2017; 8:e01281-17. [PMID: 29089427 PMCID: PMC5666155 DOI: 10.1128/mbio.01281-17] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 09/27/2017] [Indexed: 12/18/2022] Open
Abstract
During infection, the host sequesters essential nutrients, such as zinc, to combat invading microbes. Despite the ability of the immune effector protein calprotectin to bind zinc with subpicomolar affinity, Staphylococcus aureus is able to successfully compete with the host for zinc. However, the zinc importers expressed by S. aureus remain unknown. Our investigations have revealed that S. aureus possesses two importers, AdcABC and CntABCDF, which are induced in response to zinc limitation. While AdcABC is similar to known zinc importers in other bacteria, CntABCDF has not previously been associated with zinc acquisition. Concurrent loss of the two systems severely impairs the ability of S. aureus to obtain zinc and grow in zinc-limited environments. Further investigations revealed that the Cnt system is responsible for the ability of S. aureus to compete with calprotectin for zinc in culture and contributes to acquisition of zinc during infection. The cnt locus also enables S. aureus to produce the broad-spectrum metallophore staphylopine. Similarly to the Cnt transporter, loss of staphylopine severely impairs the ability of S. aureus to resist host-imposed zinc starvation, both in culture and during infection. Further investigations revealed that together staphylopine and the Cnt importer function analogously to siderophore-based iron acquisition systems in order to facilitate zinc acquisition by S. aureus Analogous systems are found in a broad range of Gram-positive and Gram-negative bacterial pathogens, suggesting that this new type of zinc importer broadly contributes to the ability of bacteria to cause infection.IMPORTANCE A critical host defense against infection is the restriction of zinc availability. Despite the subpicomolar affinity of the immune effector calprotectin for zinc, Staphylococcus aureus can successfully compete for this essential metal. Here, we describe two zinc importers, AdcABC and CntABCDF, possessed by S. aureus, the latter of which has not previously been associated with zinc acquisition. The ability of S. aureus to compete with the host for zinc is dependent on CntABCDF and the metallophore staphylopine, both in culture and during infection. These results expand the mechanisms utilized by bacteria to obtain zinc, beyond Adc-like systems, and demonstrate that pathogens utilize strategies similar to siderophore-based iron acquisition to obtain other essential metals during infection. The staphylopine synthesis machinery is present in a diverse collection of bacteria, suggesting that this new family of zinc importers broadly contributes to the ability of numerous pathogens to cause infection.
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Affiliation(s)
- Kyle P Grim
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
| | - Brian San Francisco
- Institute for Genomic Biology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
| | - Jana N Radin
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
| | - Erin B Brazel
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Jessica L Kelliher
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
| | - Paola K Párraga Solórzano
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
- Departamento de Ciencias de la Vida, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Ecuador
| | - Philip C Kim
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Thomas E Kehl-Fie
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
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43
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Martin JE, Edmonds KA, Bruce KE, Campanello GC, Eijkelkamp BA, Brazel EB, McDevitt CA, Winkler ME, Giedroc DP. The zinc efflux activator SczA protects Streptococcus pneumoniae serotype 2 D39 from intracellular zinc toxicity. Mol Microbiol 2017; 104:636-651. [PMID: 28249108 DOI: 10.1111/mmi.13654] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/21/2017] [Indexed: 12/19/2022]
Abstract
Zinc is an essential trace element that serves as a catalytic cofactor in metalloenzymes and a structural element in proteins involved in general metabolism and cellular defenses of pathogenic bacteria. Despite its importance, high zinc levels can impair cellular processes, inhibiting growth of many pathogenic bacteria, including the major respiratory pathogen Streptococcus pneumoniae. Zinc intoxication is prevented in S. pneumoniae by expression of the zinc exporter CzcD, whose expression is activated by the novel TetR-family transcriptional zinc-sensing regulator SczA. How zinc bioavailability triggers activation of SczA is unknown. It is shown here through functional studies in S. pneumoniae that an unannotated homodimeric TetR from S. agalactiae (PDB 3KKC) is the bona fide zinc efflux regulator SczA, and binds two zinc ions per protomer. Mutagenesis analysis reveals two metal binding sites, termed A and B, located on opposite sides of the SczA C-terminal regulatory domain. In vivo, the A- and B-site SczA mutant variants impact S. pneumoniae resistance to zinc toxicity and survival in infected macrophages. A model is proposed for S. pneumoniae SczA function in which both A- and B-sites were required for transcriptional activation of czcD expression, with the A-site serving as the evolutionarily conserved intracellular sensing site in SczAs.
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Affiliation(s)
- Julia E Martin
- Department of Chemistry, Indiana University, Bloomington, IN, 47405-7005, USA
| | - Katherine A Edmonds
- Department of Chemistry, Indiana University, Bloomington, IN, 47405-7005, USA
| | - Kevin E Bruce
- Department of Biology, Indiana University, Bloomington, IN, 47405-7005, USA
| | | | - Bart A Eijkelkamp
- Research Centre for Infectious Diseases, School of Biological Sciences, the University of Adelaide, SA, 5005, Australia
| | - Erin B Brazel
- Research Centre for Infectious Diseases, School of Biological Sciences, the University of Adelaide, SA, 5005, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, the University of Adelaide, SA, 5005, Australia
| | - Malcolm E Winkler
- Department of Biology, Indiana University, Bloomington, IN, 47405-7005, USA
| | - David P Giedroc
- Department of Chemistry, Indiana University, Bloomington, IN, 47405-7005, USA
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44
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Hassan KA, Pederick VG, Elbourne LDH, Paulsen IT, Paton JC, McDevitt CA, Eijkelkamp BA. Zinc stress induces copper depletion in Acinetobacter baumannii. BMC Microbiol 2017; 17:59. [PMID: 28284195 PMCID: PMC5346208 DOI: 10.1186/s12866-017-0965-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 02/24/2017] [Indexed: 12/18/2022] Open
Abstract
Background The first row transition metal ions zinc and copper are essential to the survival of many organisms, although in excess these ions are associated with significant toxicity. Here, we examined the impact of zinc and copper stress on Acinetobacter baumannii, a common opportunistic pathogen. Results We show that extracellular zinc stress induces a copper-specific depletion phenotype in A. baumannii ATCC 17978. Supplementation with copper not only fails to rescue this phenotype, but further exacerbates the copper depletion. Extensive analysis of the A. baumannii ATCC 17978 genome identified 13 putative zinc/copper resistance efflux pumps. Transcriptional analyses show that four of these transporters are responsive to zinc stress, five to copper stress and seven to the combination of zinc and copper stress, thereby revealing a likely foundation for the zinc-induced copper starvation in A. baumannii. In addition, we show that zinc and copper play crucial roles in management of oxidative stress and the membrane composition of A. baumannii. Further, we reveal that zinc and copper play distinct roles in macrophage-mediated killing of this pathogen. Conclusions Collectively, this study supports the targeting of metal ion homeostatic mechanisms as an effective antimicrobial strategy against multi-drug resistant bacterial pathogens. Electronic supplementary material The online version of this article (doi:10.1186/s12866-017-0965-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Karl A Hassan
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Victoria G Pederick
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Liam D H Elbourne
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Ian T Paulsen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia.
| | - Bart A Eijkelkamp
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia.
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45
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Heng S, McDevitt CA, Kostecki R, Morey JR, Eijkelkamp BA, Ebendorff-Heidepriem H, Monro TM, Abell AD. Microstructured Optical Fiber-based Biosensors: Reversible and Nanoliter-Scale Measurement of Zinc Ions. ACS Appl Mater Interfaces 2016; 8:12727-32. [PMID: 27152578 DOI: 10.1021/acsami.6b03565] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Sensing platforms that allow rapid and efficient detection of metal ions would have applications in disease diagnosis and study, as well as environmental sensing. Here, we report the first microstructured optical fiber-based biosensor for the reversible and nanoliter-scale measurement of metal ions. Specifically, a photoswitchable spiropyran Zn(2+) sensor is incorporated within the microenvironment of a liposome attached to microstructured optical fibers (exposed-core and suspended-core microstructured optical fibers). Both fiber-based platforms retains high selectivity of ion binding associated with a small molecule sensor, while also allowing nanoliter volume sampling and on/off switching. We have demonstrated that multiple measurements can be made on a single sample without the need to change the sensor. The ability of the new sensing platform to sense Zn(2+) in pleural lavage and nasopharynx of mice was compared to that of established ion sensing methodologies such as inductively coupled plasma mass spectrometry (ICP-MS) and a commercially available fluorophore (Fluozin-3), where the optical-fiber-based sensor provides a significant advantage in that it allows the use of nanoliter (nL) sampling when compared to ICP-MS (mL) and FluoZin-3 (μL). This work paves the way to a generic approach for developing surface-based ion sensors using a range of sensor molecules, which can be attached to a surface without the need for its chemical modification and presents an opportunity for the development of new and highly specific ion sensors for real time sensing applications.
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Affiliation(s)
- Sabrina Heng
- ARC Center of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Christopher A McDevitt
- Research Center for Infectious Diseases, School of Biological Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Roman Kostecki
- ARC Center of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Jacqueline R Morey
- Research Center for Infectious Diseases, School of Biological Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Bart A Eijkelkamp
- Research Center for Infectious Diseases, School of Biological Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Heike Ebendorff-Heidepriem
- ARC Center of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Tanya M Monro
- The University of South Australia , Adelaide, South Australia 5000, Australia
| | - Andrew D Abell
- ARC Center of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, Department of Chemistry, School of Physical Sciences, The University of Adelaide , Adelaide, South Australia 5005, Australia
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46
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Luo Z, Morey JR, McDevitt CA, Kobe B. Heterogeneous nucleation is required for crystallization of the ZnuA domain of pneumococcal AdcA. Acta Crystallogr F Struct Biol Commun 2015; 71:1459-64. [PMID: 26625286 DOI: 10.1107/s2053230x15021330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 11/10/2015] [Indexed: 01/17/2023]
Abstract
Zn(2+) is an essential nutrient for all known forms of life. In the major human pathogen Streptococcus pneumoniae, the acquisition of Zn(2+) is facilitated by two Zn(2+)-specific solute-binding proteins: AdcA and AdcAII. To date, there has been a paucity of structural information on AdcA, which has hindered a deeper understanding of the mechanism underlying pneumococcal Zn(2+) acquisition. Native AdcA consists of two domains: an N-terminal ZnuA domain and a C-terminal ZinT domain. In this study, the ZnuA domain of AdcA was crystallized. The initial crystals of the ZnuA-domain protein were obtained using dried seaweed as a heterogeneous nucleating agent. No crystals were obtained in the absence of the heterogeneous nucleating agent. These initial crystals were subsequently used as seeds to produce diffraction-quality crystals. The crystals diffracted to 2.03 Å resolution and had the symmetry of space group P1. This study demonstrates the utility of heterogeneous nucleation. The solution of the crystal structures will lead to further understanding of Zn(2+) acquisition by S. pneumoniae.
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Affiliation(s)
- Zhenyao Luo
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
| | - Jacqueline R Morey
- Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Boštjan Kobe
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
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47
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Deplazes E, Begg SL, van Wonderen JH, Campbell R, Kobe B, Paton JC, MacMillan F, McDevitt CA, O'Mara ML. Characterizing the conformational dynamics of metal-free PsaA using molecular dynamics simulations and electron paramagnetic resonance spectroscopy. Biophys Chem 2015; 207:51-60. [PMID: 26379256 DOI: 10.1016/j.bpc.2015.08.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 08/25/2015] [Accepted: 08/27/2015] [Indexed: 12/17/2022]
Abstract
Prokaryotic metal-ion receptor proteins, or solute-binding proteins, facilitate the acquisition of metal ions from the extracellular environment. Pneumococcal surface antigen A (PsaA) is the primary Mn(2+)-recruiting protein of the human pathogen Streptococcus pneumoniae and is essential for its in vivo colonization and virulence. The recently reported high-resolution structures of metal-free and metal-bound PsaA have provided the first insights into the mechanism of PsaA-facilitated metal binding. However, the conformational dynamics of metal-free PsaA in solution remain unknown. Here, we use continuous wave electron paramagnetic resonance (EPR) spectroscopy and molecular dynamics (MD) simulations to study the relative flexibility of the structural domains in metal-free PsaA and its distribution of conformations in solution. The results show that the crystal structure of metal-free PsaA is a good representation of the dominant conformation in solution, but the protein also samples structurally distinct conformations that are not captured by the crystal structure. Further, these results suggest that the metal binding site is both larger and more solvent exposed than indicated by the metal-free crystal structure. Collectively, this study provides atomic-resolution insight into the conformational dynamics of PsaA prior to metal binding and lays the groundwork for future EPR and MD based studies of PsaA in solution.
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Affiliation(s)
- Evelyne Deplazes
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia; Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Stephanie L Begg
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, Australia
| | - Jessica H van Wonderen
- Henry Wellcome Unit for Biological EPR, School of Chemistry, Norwich Research Park, University of East Anglia, Norwich, UK
| | - Rebecca Campbell
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, Australia
| | - Bostjan Kobe
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia; Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia; Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, Australia
| | - Fraser MacMillan
- Henry Wellcome Unit for Biological EPR, School of Chemistry, Norwich Research Park, University of East Anglia, Norwich, UK
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, Australia.
| | - Megan L O'Mara
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia; Research School of Chemistry, The Australian National University, Canberra, Australia. megan.o'
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48
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Pederick VG, Eijkelkamp BA, Begg SL, Ween MP, McAllister LJ, Paton JC, McDevitt CA. ZnuA and zinc homeostasis in Pseudomonas aeruginosa. Sci Rep 2015; 5:13139. [PMID: 26290475 PMCID: PMC4542158 DOI: 10.1038/srep13139] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 07/21/2015] [Indexed: 11/09/2022] Open
Abstract
Pseudomonas aeruginosa is a ubiquitous environmental bacterium and a clinically significant opportunistic human pathogen. Central to the ability of P. aeruginosa to colonise both environmental and host niches is the acquisition of zinc. Here we show that P. aeruginosa PAO1 acquires zinc via an ATP-binding cassette (ABC) permease in which ZnuA is the high affinity, zinc-specific binding protein. Zinc uptake in Gram-negative organisms predominantly occurs via an ABC permease, and consistent with this expectation a P. aeruginosa ΔznuA mutant strain showed an ~60% reduction in cellular zinc accumulation, while other metal ions were essentially unaffected. Despite the major reduction in zinc accumulation, minimal phenotypic differences were observed between the wild-type and ΔznuA mutant strains. However, the effect of zinc limitation on the transcriptome of P. aeruginosa PAO1 revealed significant changes in gene expression that enable adaptation to low-zinc conditions. Genes significantly up-regulated included non-zinc-requiring paralogs of zinc-dependent proteins and a number of novel import pathways associated with zinc acquisition. Collectively, this study provides new insight into the acquisition of zinc by P. aeruginosa PAO1, revealing a hitherto unrecognized complexity in zinc homeostasis that enables the bacterium to survive under zinc limitation.
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Affiliation(s)
- Victoria G Pederick
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Bart A Eijkelkamp
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Stephanie L Begg
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Miranda P Ween
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Lauren J McAllister
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - James C Paton
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Christopher A McDevitt
- Research Centre for Infectious Diseases, School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
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49
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Bajaj M, Mamidyala SK, Zuegg J, Begg SL, Ween MP, Luo Z, Huang JX, McEwan AG, Kobe B, Paton JC, McDevitt CA, Cooper MA. Discovery of novel pneumococcal surface antigen A (PsaA) inhibitors using a fragment-based drug design approach. ACS Chem Biol 2015; 10:1511-20. [PMID: 25786639 DOI: 10.1021/cb501032x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Streptococcus pneumoniae is a leading cause of life-threatening bacterial infections, especially in young children in developing countries. Pneumococcal infections can be treated with β-lactam antibiotics, but rapid emergence of multidrug-resistant strains of S. pneumoniae over the past two decades has emphasized the need to identify novel drug targets. Pneumococcal surface antigen A (PsaA) is one such target, found on the cell surface of S. pneumoniae. It functions as a high-affinity substrate-binding protein, facilitating acquisition of Mn(2+), which has an important role in protecting S. pneumoniae from reactive oxygen species and, hence, oxidative stress. Consequently, PsaA is essential for bacterial survival and an important virulence factor, which makes it a promising target for antibiotic drug development. To design novel PsaA inhibitors, we used a combination of de novo fragment-based drug discovery and in silico virtual screening methods. We profiled a collection of low molecular weight compounds that were selected based on their structural diversity and ability to bind to apo-PsaA in a virtual docking experiment. The screening resulted in two initial hits that were further optimized by structural variation to improve their potency while maintaining their ligand efficiency and favorable physicochemical properties. The optimized hits were validated using a cell-based assay and molecular dynamics simulations. We found that virtual screening substantially augmented fragment-based drug design approaches, leading to the identification of novel pneumococcal PsaA inhibitors.
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Affiliation(s)
- Megha Bajaj
- Institute
for Molecular Bioscience, The University of Queensland, St. Lucia, 4072, Australia
| | - Sreeman K. Mamidyala
- Institute
for Molecular Bioscience, The University of Queensland, St. Lucia, 4072, Australia
| | - Johannes Zuegg
- Institute
for Molecular Bioscience, The University of Queensland, St. Lucia, 4072, Australia
| | - Stephanie L. Begg
- Research
Centre for Infectious Diseases, School of Molecular and Biomedical
Science, University of Adelaide, Adelaide 5005, Australia
| | - Miranda P. Ween
- Research
Centre for Infectious Diseases, School of Molecular and Biomedical
Science, University of Adelaide, Adelaide 5005, Australia
| | - Zhenyao Luo
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia
| | - Johnny X. Huang
- Institute
for Molecular Bioscience, The University of Queensland, St. Lucia, 4072, Australia
| | - Alastair G. McEwan
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia
- Australian
Infectious Diseases Research Centre, The University of Queensland, St. Lucia, 4072, Australia
| | - Bostjan Kobe
- Institute
for Molecular Bioscience, The University of Queensland, St. Lucia, 4072, Australia
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, 4072, Australia
- Australian
Infectious Diseases Research Centre, The University of Queensland, St. Lucia, 4072, Australia
| | - James C. Paton
- Research
Centre for Infectious Diseases, School of Molecular and Biomedical
Science, University of Adelaide, Adelaide 5005, Australia
| | - Christopher A. McDevitt
- Research
Centre for Infectious Diseases, School of Molecular and Biomedical
Science, University of Adelaide, Adelaide 5005, Australia
| | - Matthew A. Cooper
- Institute
for Molecular Bioscience, The University of Queensland, St. Lucia, 4072, Australia
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50
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Morey JR, McDevitt CA, Kehl-Fie TE. Host-imposed manganese starvation of invading pathogens: two routes to the same destination. Biometals 2015; 28:509-19. [PMID: 25836716 PMCID: PMC4430393 DOI: 10.1007/s10534-015-9850-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 03/24/2015] [Indexed: 01/07/2023]
Abstract
During infection invading pathogens must acquire all essential nutrients, including first row transition metals, from the host. To combat invaders, the host exploits this fact and restricts the availability of these nutrients using a defense mechanism known as nutritional immunity. While iron sequestration is the most well-known aspect of this defense, recent work has revealed that the host restricts the availability of other essential elements, notably manganese (Mn), during infection. Furthermore, these studies have revealed that the host utilizes multiple strategies that extend beyond metal sequestration to prevent bacteria from obtaining these metals. This review will discuss the mechanisms by which bacteria attempt to obtain the essential first row transition metal ion Mn during infection, and the approaches utilized by the host to prevent this occurrence. In addition, this review will discuss the impact of host-imposed Mn starvation on invading bacteria.
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Affiliation(s)
- Jacqueline R. Morey
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, Adelaide, South Australia, Australia
| | - Christopher A. McDevitt
- Research Centre for Infectious Diseases, School of Molecular and Biomedical Science, University of Adelaide, Adelaide, South Australia, Australia
| | - Thomas E. Kehl-Fie
- Department of Microbiology, University of Illinois Urbana-Champaign, Urbana IL, USA
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