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Arrault C, Monneau YR, Martin M, Cantrelle FX, Boll E, Chirot F, Comby Zerbino C, Walker O, Hologne M. The battle for silver binding: How the interplay between the SilE, SilF, and SilB proteins contributes to the silver efflux pump mechanism. J Biol Chem 2023; 299:105004. [PMID: 37394004 PMCID: PMC10407283 DOI: 10.1016/j.jbc.2023.105004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 06/27/2023] [Accepted: 06/28/2023] [Indexed: 07/04/2023] Open
Abstract
The resistance of gram-negative bacteria to silver ions is mediated by a silver efflux pump, which mainly relies on a tripartite efflux complex SilCBA, a metallochaperone SilF and an intrinsically disordered protein SilE. However, the precise mechanism by which silver ions are extruded from the cell and the different roles of SilB, SilF, and SilE remain poorly understood. To address these questions, we employed nuclear magnetic resonance and mass spectrometry to investigate the interplay between these proteins. We first solved the solution structures of SilF in its free and Ag+-bound forms, and we demonstrated that SilB exhibits two silver binding sites in its N and C termini. Conversely to the homologous Cus system, we determined that SilF and SilB interact without the presence of silver ions and that the rate of silver dissociation is eight times faster when SilF is bound to SilB, indicating the formation of a SilF-Ag-SilB intermediate complex. Finally, we have shown that SilE does not bind to either SilF or SilB, regardless of the presence or absence of silver ions, further corroborating that it merely acts as a regulator that prevents the cell from being overloaded with silver. Collectively, we have provided further insights into protein interactions within the sil system that contribute to bacterial resistance to silver ions.
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Affiliation(s)
- Cyrielle Arrault
- Université de Lyon, CNRS, UCB Lyon1, Institut des Sciences Analytiques, UMR5280, Villeurbanne, France
| | - Yoan Rocky Monneau
- Université de Lyon, CNRS, UCB Lyon1, Institut des Sciences Analytiques, UMR5280, Villeurbanne, France; Department of Structural Biology, St Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - Marie Martin
- Université de Lyon, CNRS, UCB Lyon1, Institut des Sciences Analytiques, UMR5280, Villeurbanne, France
| | - François-Xavier Cantrelle
- Université de Lille, CNRS, UMR8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Emmanuelle Boll
- Université de Lille, CNRS, UMR8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France
| | - Fabien Chirot
- Univ Lyon 1, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, UMR5306, Cité Lyonnaise de l'Environnement et de l'Analyse, Villeurbanne, France
| | - Clothilde Comby Zerbino
- Univ Lyon 1, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, UMR5306, Cité Lyonnaise de l'Environnement et de l'Analyse, Villeurbanne, France
| | - Olivier Walker
- Université de Lyon, CNRS, UCB Lyon1, Institut des Sciences Analytiques, UMR5280, Villeurbanne, France
| | - Maggy Hologne
- Université de Lyon, CNRS, UCB Lyon1, Institut des Sciences Analytiques, UMR5280, Villeurbanne, France.
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2
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Hirth N, Gerlach MS, Wiesemann N, Herzberg M, Große C, Nies DH. Full Copper Resistance in Cupriavidus metallidurans Requires the Interplay of Many Resistance Systems. Appl Environ Microbiol 2023:e0056723. [PMID: 37191542 DOI: 10.1128/aem.00567-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Abstract
The metal-resistant bacterium Cupriavidus metallidurans uses its copper resistance components to survive the synergistic toxicity of copper ions and gold complexes in auriferous soils. The cup, cop, cus, and gig determinants encode as central component the Cu(I)-exporting PIB1-type ATPase CupA, the periplasmic Cu(I)-oxidase CopA, the transenvelope efflux system CusCBA, and the Gig system with unknown function, respectively. The interplay of these systems with each other and with glutathione (GSH) was analyzed. Copper resistance in single and multiple mutants up to the quintuple mutant was characterized in dose-response curves, Live/Dead-staining, and atomic copper and glutathione content of the cells. The regulation of the cus and gig determinants was studied using reporter gene fusions and in case of gig also RT-PCR studies, which verified the operon structure of gigPABT. All five systems contributed to copper resistance in the order of importance: Cup, Cop, Cus, GSH, and Gig. Only Cup was able to increase copper resistance of the Δcop Δcup Δcus Δgig ΔgshA quintuple mutant but the other systems were required to increase copper resistance of the Δcop Δcus Δgig ΔgshA quadruple mutant to the parent level. Removal of the Cop system resulted in a clear decrease of copper resistance in most strain backgrounds. Cus cooperated with and partially substituted Cop. Gig and GSH cooperated with Cop, Cus, and Cup. Copper resistance is thus the result of an interplay of many systems. IMPORTANCE The ability of bacteria to maintain homeostasis of the essential-but-toxic "Janus"-faced element copper is important for their survival in many natural environments but also in case of pathogenic bacteria in their respective host. The most important contributors to copper homeostasis have been identified in the last decades and comprise PIB1-type ATPases, periplasmic copper- and oxygen-dependent copper oxidases, transenvelope efflux systems, and glutathione; however, it is not known how all these players interact. This publication investigates this interplay and describes copper homeostasis as a trait emerging from a network of interacting resistance systems.
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Affiliation(s)
- Niklas Hirth
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | | | - Nicole Wiesemann
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Martin Herzberg
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Cornelia Große
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Dietrich H Nies
- Molecular Microbiology, Martin-Luther-University Halle-Wittenberg, Halle, Germany
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3
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Structural Analyses of the Multicopper Site of CopG Support a Role as a Redox Enzyme. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1414:97-121. [PMID: 36637718 DOI: 10.1007/5584_2022_753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Metal ions can be both essential components of cells as well as potential toxins if present in excess. Organisms utilize a variety of protein systems to maintain the concentration of metal ions within the appropriate range for cellular function, and to avoid concentrations where cellular damage can occur. In bacteria, numerous proteins contribute to copper homeostasis, including copper transporters, chelators, and redox enzymes. The genes that encode these proteins are often found in clusters, thus providing modular components that work together to achieve homeostasis. A better understanding of how these components function and cooperate to achieve metal ion resistance is needed, given the extensive use of metal ions, including copper, as broad-spectrum biocides in a variety of clinical and environmental settings. The copG gene is a common component of such copper resistance clusters, but its contribution to copper resistance is not well understood. In this review the available information about the CopG protein encoded by this gene is summarized. Comparison of the recent structure to diverse copper-containing metallochaperones, metalloenzymes, and electron transfer proteins suggests that CopG is a redox enzyme that uses multiple copper ions as active site redox cofactors to act on additional copper ion substrates. Mechanisms for both oxidase and reductase activity are proposed, and the biological advantages that these activities can contribute in conjunction with existing systems are described.
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Krutyakov YA, Khina AG. Bacterial Resistance to Nanosilver: Molecular Mechanisms and Possible Ways to Overcome them. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822050106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Kekez I, Faletar M, Kekez M, Cendron L, Wright M, Zanotti G, Matković-Čalogović D. Copper Binding and Oligomerization Studies of the Metal Resistance Determinant CrdA from Helicobacter pylori. Molecules 2022; 27:molecules27113387. [PMID: 35684325 PMCID: PMC9182242 DOI: 10.3390/molecules27113387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/17/2022] [Accepted: 05/20/2022] [Indexed: 11/16/2022] Open
Abstract
Within this research, the CrdA protein from Helicobacter pylori (HpCrdA), a putative copper-binding protein important for the survival of bacterium, was biophysically characterized in a solution, and its binding affinity toward copper was experimentally determined. Incubation of HpCrdA with Cu(II) ions favors the formation of the monomeric species in the solution. The modeled HpCrdA structure shows a conserved methionine-rich region, a potential binding site for Cu(I), as in the structures of similar copper-binding proteins, CopC and PcoC, from Pseudomonas syringae and from Escherichia coli, respectively. Within the conserved amino acid motif, HpCrdA contains two additional methionines and two glutamic acid residues (MMXEMPGMXXMXEM) in comparison to CopC and PcoC but lacks the canonical Cu(II) binding site (two His) since the sequence has no His residues. The methionine-rich site is in a flexible loop and can adopt different geometries for the two copper oxidation states. It could bind copper in both oxidation states (I and II), but with different binding affinities, micromolar was found for Cu(II), and less than nanomolar is proposed for Cu(I). Considering that CrdA is a periplasmic protein involved in chaperoning copper export and delivery in the H. pylori cell and that the affinity of the interaction corresponds to a middle or strong metal–protein interaction depending on the copper oxidation state, we conclude that the interaction also occurs in vivo and is physiologically relevant for H. pylori.
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Affiliation(s)
- Ivana Kekez
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (M.F.); (M.K.)
- Correspondence: (I.K.); (D.M.-Č.); Tel.: +385-14-606-345 (D.M.-Č.)
| | - Mihovil Faletar
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (M.F.); (M.K.)
| | - Mario Kekez
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (M.F.); (M.K.)
| | - Laura Cendron
- Department of Biology, University of Padua, Via Ugo Bassi 58/B, 35131 Padua, Italy;
| | - Maya Wright
- Fluidic Analytics Ltd., Unit A Paddocks Business Centre, Cherry Hinton Road, Cambridge CB1 8DH, UK;
| | - Giuseppe Zanotti
- Department of Biomedical Sciences, University of Padua, Via Ugo Bassi 58/B, 35131 Padua, Italy;
| | - Dubravka Matković-Čalogović
- Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia; (M.F.); (M.K.)
- Correspondence: (I.K.); (D.M.-Č.); Tel.: +385-14-606-345 (D.M.-Č.)
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6
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Wei Z, Wei Y, Li H, Shi D, Yang D, Yin J, Zhou S, Chen T, Li J, Jin M. Emerging pollutant metformin in water promotes the development of multiple-antibiotic resistance in Escherichia coli via chromosome mutagenesis. JOURNAL OF HAZARDOUS MATERIALS 2022; 430:128474. [PMID: 35180521 DOI: 10.1016/j.jhazmat.2022.128474] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/25/2021] [Accepted: 02/09/2022] [Indexed: 06/14/2023]
Abstract
Antibiotics are known to be key drivers of antibiotic resistance and antibiotic resistance gene transmission. However, the contribution of the emerging pollutant metformin in facilitating antibiotic resistance remains unclear. In this study, Escherichia coli K12 (E. coli) was exposed to metformin at concentrations ranging from 10-7 to 200 mg/L, and antibiotic susceptibility test of isolated mutants was evaluated. DNA and RNA sequencing and real-time quantitative PCR (qPCR) were performed to identify the underlying mechanisms. The results showed metformin concentrations ranging from 10-6 to 200 mg/L caused multiple-antibiotic resistance in E. coli. After 1 day exposure to metformin at 1 ng/L, the mutation frequency in E. coli increased to 1.24 × 10-8, and it further increased to 7.13 × 10-8 when prolonged to 5 days. And the mutants showed multiple-antibiotic resistance. Whole-genome DNA analysis of mutants showed chromosome mutagenesis in marR, tonB, and fhuA. Global transcriptional analysis and qPCR revealed the expressions of emrK, emrY, cusB, cusC, hycA, cecR, marA, acrA, and acrB were upregulated and those of tonB and fhuA were significantly downregulated. Thus, an increase in efflux systems AcrAB-TolC, EmrKY-TolC, and CusCFBA together with a decrease in FhuA-TonB protein complex play vital roles in the multiple-antibiotic resistance induced by metformin.
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Affiliation(s)
- Zilin Wei
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Yijun Wei
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Haibei Li
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Danyang Shi
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Dong Yang
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Jing Yin
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Shuqing Zhou
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Tianjiao Chen
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Junwen Li
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China
| | - Min Jin
- Department of Environment and Health, Tianjin Institute of Environmental & Operational Medicine, Key Laboratory of Risk Assessment and Control for Environment & Food Safety, No.1 Dali Road, Tianjin 300050, China.
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7
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Babel L, Nguyen MH, Mittelheisser C, Martin M, Fromm KM, Walker O, Hologne M. NMR reveals the interplay between SilE and SilB model peptides in the context of silver resistance. Chem Commun (Camb) 2021; 57:8726-8729. [PMID: 34396382 PMCID: PMC8686694 DOI: 10.1039/d1cc02597j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
SilE and SilB are both proteins involved in the silver efflux pump found in Gram-negative bacteria such as S. typhimurium. Using model peptides along with NMR and CD experiments, we show how SilE may store silver ions prior to delivery and we hypothesize for the first time the interplay between SilB and SilE. Illustrative sketch representative of the interplay between the SilB and SilE proteins in the context of silver bacteria resistance. In case of an excess of silver, SilE plays the role of a regulator and avoids a collapse of the silver efflux pump.![]()
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Affiliation(s)
- Lucille Babel
- University of Fribourg, Department of Chemistry, chemin du musée 9, Fribourg 1700, Switzerland
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8
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Bacterial Metal Resistance: Coping with Copper without Cooperativity? mBio 2021; 12:e0065321. [PMID: 34126768 PMCID: PMC8262934 DOI: 10.1128/mbio.00653-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
In Escherichia coli and other Gram-negative bacteria, tripartite efflux pumps (TEPs) span the entire cell envelope and serve to remove noxious molecules from the cell. CusBCA is a TEP responsible for copper and silver detoxification in E. coli powered by the resistance-nodulation-cell division (RND) transporter, CusA. In a recent study, Moseng et al. (M. A. Moseng, M. Lyu, T. Pipatpolkai, P. Glaza, et al., mBio 12:e00452-21, 2021, https://dx.doi.org/10.1128/mBio.00452-21) obtained cryo-electron microscopy (cryo-EM) structures of CusA trimers in the presence of copper. The multiple conformations revealed suggest that the three monomers function independently within the CusA trimer, contrary to the cooperative mechanism proposed for the multidrug exporting RND transporter, AcrB. The work prompts consideration of the mechanism of this class of transporter and provides a basis to underpin further studies of TEPs important for bacterial survival.
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9
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Giachino A, Focarelli F, Marles-Wright J, Waldron KJ. Synthetic biology approaches to copper remediation: bioleaching, accumulation and recycling. FEMS Microbiol Ecol 2021; 97:6021318. [PMID: 33501489 DOI: 10.1093/femsec/fiaa249] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 12/02/2020] [Indexed: 12/20/2022] Open
Abstract
One of the current aims of synthetic biology is the development of novel microorganisms that can mine economically important elements from the environment or remediate toxic waste compounds. Copper, in particular, is a high-priority target for bioremediation owing to its extensive use in the food, metal and electronic industries and its resulting common presence as an environmental pollutant. Even though microbe-aided copper biomining is a mature technology, its application to waste treatment and remediation of contaminated sites still requires further research and development. Crucially, any engineered copper-remediating chassis must survive in copper-rich environments and adapt to copper toxicity; they also require bespoke adaptations to specifically extract copper and safely accumulate it as a human-recoverable deposit to enable biorecycling. Here, we review current strategies in copper bioremediation, biomining and biorecycling, as well as strategies that extant bacteria use to enhance copper tolerance, accumulation and mineralization in the native environment. By describing the existing toolbox of copper homeostasis proteins from naturally occurring bacteria, we show how these modular systems can be exploited through synthetic biology to enhance the properties of engineered microbes for biotechnological copper recovery applications.
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Affiliation(s)
- Andrea Giachino
- Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - Francesca Focarelli
- Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, NE2 4HH, United Kingdom
| | - Jon Marles-Wright
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Kevin J Waldron
- Faculty of Medical Sciences, Biosciences Institute, Newcastle University, Newcastle upon Tyne, NE2 4HH, United Kingdom
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10
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Dulay H, Tabares M, Kashefi K, Reguera G. Cobalt Resistance via Detoxification and Mineralization in the Iron-Reducing Bacterium Geobacter sulfurreducens. Front Microbiol 2020; 11:600463. [PMID: 33324382 PMCID: PMC7726332 DOI: 10.3389/fmicb.2020.600463] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 11/03/2020] [Indexed: 12/18/2022] Open
Abstract
Bacteria in the genus Geobacter thrive in iron- and manganese-rich environments where the divalent cobalt cation (CoII) accumulates to potentially toxic concentrations. Consistent with selective pressure from environmental exposure, the model laboratory representative Geobacter sulfurreducens grew with CoCl2 concentrations (1 mM) typically used to enrich for metal-resistant bacteria from contaminated sites. We reconstructed from genomic data canonical pathways for CoII import and assimilation into cofactors (cobamides) that support the growth of numerous syntrophic partners. We also identified several metal efflux pumps, including one that was specifically upregulated by CoII. Cells acclimated to metal stress by downregulating non-essential proteins with metals and thiol groups that CoII preferentially targets. They also activated sensory and regulatory proteins involved in detoxification as well as pathways for protein and DNA repair. In addition, G. sulfurreducens upregulated respiratory chains that could have contributed to the reductive mineralization of the metal on the cell surface. Transcriptomic evidence also revealed pathways for cell envelope modification that increased metal resistance and promoted cell-cell aggregation and biofilm formation in stationary phase. These complex adaptive responses confer on Geobacter a competitive advantage for growth in metal-rich environments that are essential to the sustainability of cobamide-dependent microbiomes and the sequestration of the metal in hitherto unknown biomineralization reactions.
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Affiliation(s)
- Hunter Dulay
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
| | - Marcela Tabares
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
| | - Kazem Kashefi
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
| | - Gemma Reguera
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
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11
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Mehmood A, Naseer S, Ali A, Fatimah H, Rehman S, Kiani AK. Identification of novel vaccine candidates against carbapenem resistant Klebsiella pneumoniae: A systematic reverse proteomic approach. Comput Biol Chem 2020; 89:107380. [PMID: 32992120 DOI: 10.1016/j.compbiolchem.2020.107380] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 08/09/2020] [Accepted: 09/18/2020] [Indexed: 11/18/2022]
Abstract
Klebsiella pneumoniae is declared as antibiotic resistant by WHO, with the critical urgency of developing novel antimicrobial therapeutics as drug resistance is the second most dangerous threat after terrorism. Besides many attempts still, there is no effective vaccine available against K. pneumoniae. By utilizing all the available proteomic data we prioritized the novel proteins ideal for vaccine development using bioinformatics tools and techniques. Among the huge data, eight proteins passed all the barriers and were considered ideal candidates for vaccine development. These include: copper silver efflux system outer membrane protein (CusC), outer membrane porin protein (OmpN), Fe++ enterobactin transporter substrate binding protein (fepB), zinc transporter substrate binding protein (ZnuA), ribonuclease HI, tellurite resistant methyltransferase (the B), and two uncharacterized hypothetical proteins (WP_002918223 and WP_002892366). These proteins were also subjected to epitope analysis and were found best for developing subunit vaccine against K. pneumoniae. The study shows that the potential vaccine targets are sufficiently efficient being virulent, of outer membranous origin and can be proposed for the DNA third-generation vaccines development that would help to cope up infections caused by multidrug-resistant K. pneumoniae.
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Affiliation(s)
- Asim Mehmood
- Department of Biology and Environmental Science, Faculty of Sciences, Allama Iqbal Open University, Islamabad, Pakistan
| | - Samar Naseer
- Department of Biology and Environmental Science, Faculty of Sciences, Allama Iqbal Open University, Islamabad, Pakistan.
| | - Amjad Ali
- Department of Industrial Biotechnology, Atta Ur Rahman School of Applied Biosciences (ASAB), National University of Sciences & Technology (NUST), Islamabad, Pakistan
| | - Hina Fatimah
- Department of Biology and Environmental Science, Faculty of Sciences, Allama Iqbal Open University, Islamabad, Pakistan
| | - Shazia Rehman
- Department of Botany, Rawalpindi Women University, Rawalpindi, Pakistan
| | - Aysha Karim Kiani
- Department of Biology and Environmental Science, Faculty of Sciences, Allama Iqbal Open University, Islamabad, Pakistan
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12
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Marshall RL, Bavro VN. Mutations in the TolC Periplasmic Domain Affect Substrate Specificity of the AcrAB-TolC Pump. Front Mol Biosci 2020; 7:166. [PMID: 32850959 PMCID: PMC7396618 DOI: 10.3389/fmolb.2020.00166] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 07/01/2020] [Indexed: 01/08/2023] Open
Abstract
TolC and the other members of the outer membrane factor (OMF) family are outer membrane proteins forming trimeric channels that serve as a conduit for most actively effluxed substrates in Gram-negative bacteria by providing a key component in a multitude of tripartite efflux-pumps. Current models of tripartite pump assembly ascribe substrate selection to the inner-membrane transporter and periplasmic-adapter protein (PAP) assembly, suggesting that TolC is a passive, non-selective channel. While the membrane-embedded portion of the protein adopts a porin-like fold, the periplasmic domain of TolC presents a unique "alpha-barrel" architecture. This alpha-barrel consists of pseudo-continuous α-helices forming curved coiled-coils, whose tips form α-helical hairpins, relaxation of which results in a transition of TolC from a closed to an open-aperture state allowing effective efflux of substrates through its channel. Here, we analyzed the effects of site-directed mutations targeting the alpha-barrel of TolC, of the principal tripartite efflux-pump Escherichia coli AcrAB-TolC, on the activity and specificity of efflux. Live-cell functional assays with these TolC mutants revealed that positions both at the periplasmic tip of, and partway up the TolC coiled-coil alpha-barrel domain are involved in determining the functionality of the complex. We report that mutations affecting the electrostatic properties of the channel, particularly the D371V mutation, significantly impact growth even in the absence of antibiotics, causing hyper-susceptibility to all tested efflux-substrates. These results suggest that inhibition of TolC functionality is less well-tolerated than deletion of tolC, and such inhibition may have an antibacterial effect. Significantly and unexpectedly, we identified antibiotic-specific phenotypes associated with novel TolC mutations, suggesting that substrate specificity may not be determined solely by the transporter protein or the PAP, but may reside at least partially with the TolC-channel. Furthermore, some of the effects of mutations are difficult to reconcile with the currently prevalent tip-to-tip model of PAP-TolC interaction due to their location higher-up on the TolC alpha-barrel relative to the proposed PAP-docking sites. Taken together our results suggest a possible new role for TolC in vetting of efflux substrates, alongside its established role in tripartite complex assembly.
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Affiliation(s)
- Robert L. Marshall
- School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Vassiliy N. Bavro
- School of Biosciences, University of Birmingham, Birmingham, United Kingdom
- School of Life Sciences, University of Essex, Colchester, United Kingdom
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13
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Hausrath AC, Ramirez NA, Ly AT, McEvoy MM. The bacterial copper resistance protein CopG contains a cysteine-bridged tetranuclear copper cluster. J Biol Chem 2020; 295:11364-11376. [PMID: 32571874 DOI: 10.1074/jbc.ra120.013907] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 06/08/2020] [Indexed: 01/31/2023] Open
Abstract
CopG is an uncharacterized protein ubiquitous in Gram-negative bacteria whose gene frequently occurs in clusters of copper resistance genes and can be recognized by the presence of a conserved CxCC motif. To investigate its contribution to copper resistance, here we undertook a structural and biochemical characterization of the CopG protein from Pseudomonas aeruginosa Results from biochemical analyses of CopG purified under aerobic conditions indicate that it is a green copper-binding protein that displays absorbance maxima near 411, 581, and 721 nm and is monomeric in solution. Determination of the three-dimensional structure by X-ray crystallography revealed that CopG consists of a thioredoxin domain with a C-terminal extension that contributes to metal binding. We noted that adjacent to the CxCC motif is a cluster of four copper ions bridged by cysteine sulfur atoms. Structures of CopG in two oxidation states support the assignment of this protein as an oxidoreductase. On the basis of these structural and spectroscopic findings and also genetic evidence, we propose that CopG has a role in interconverting Cu(I) and Cu(II) to minimize toxic effects and facilitate export by the Cus RND transporter efflux system.
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Affiliation(s)
- Andrew C Hausrath
- Institute for Society and Genetics, University of California, Los Angeles, California, USA.,Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, California, USA
| | - Nicholas A Ramirez
- Molecular Biology Institute, University of California, Los Angeles, California, USA
| | - Alan T Ly
- Institute for Society and Genetics, University of California, Los Angeles, California, USA
| | - Megan M McEvoy
- Institute for Society and Genetics, University of California, Los Angeles, California, USA .,Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, California, USA.,Molecular Biology Institute, University of California, Los Angeles, California, USA
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14
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Alwan KB, Welch EF, Blackburn NJ. Catalytic M Center of Copper Monooxygenases Probed by Rational Design. Effects of Selenomethionine and Histidine Substitution on Structure and Reactivity. Biochemistry 2019; 58:4436-4446. [PMID: 31626532 DOI: 10.1021/acs.biochem.9b00823] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The M centers of the mononuclear monooxygenases peptidylglycine monooxygenase (PHM) and dopamine β-monooxygenase bind and activate dioxygen en route to substrate hydroxylation. Recently, we reported the rational design of a protein-based model in which the CusF metallochaperone was repurposed via a His to Met mutation to act as a structural and spectroscopic biomimic. The PHM M site exhibits a number of unusual attributes, including a His2Met ligand set, a fluxional Cu(I)-S(Met) bond, tight binding of exogenous ligands CO and N3-, and complete coupling of oxygen reduction to substrate hydroxylation even at extremely low turnover rates. In particular, mutation of the Met ligand to His completely eliminates the catalytic activity despite the propensity of CuI-His3 centers to bind and activate dioxygen in other metalloenzyme systems. Here, we further develop the CusF-based model to explore methionine variants in which Met is replaced by selenomethionine (SeM) and histidine. We examine the effects on coordinate structure and exogenous ligand binding via X-ray absorption spectroscopy and electron paramagnetic resonance and probe the consequences of mutations on redox chemistry via studies of the reduction by ascorbate and oxidation via molecular oxygen. The M-site model is three-coordinate in the Cu(I) state and binds CO to form a four-coordinate carbonyl. In the oxidized forms, the coordination changes to tetragonal five-coordinate with a long axial Met ligand that like the enzymes is undetectable at either the Cu or Se K edges. The EXAFS data at the Se K edge of the SeM variant provide unique information about the nature of the Cu-methionine bond that is likewise weak and fluxional. Kinetic studies document the sluggish reactivity of the Cu(I) complexes with molecular oxygen and rapid rates of reduction of the Cu(II) complexes by ascorbate, indicating a remarkable stability of the Cu(I) state in all three derivatives. The results show little difference between the Met ligand and its SeM and His congeners and suggest that the Met contributes to catalysis in ways that are more complex than simple perturbation of the redox chemistry. Overall, the results stimulate a critical re-examination of the canonical reaction mechanisms of the mononuclear copper monooxygenases.
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Affiliation(s)
- Katherine B Alwan
- Department of Chemical Physiology and Biochemistry , Oregon Health & Sciences University , Portland , Oregon 97239 , United States
| | - Evan F Welch
- Department of Chemical Physiology and Biochemistry , Oregon Health & Sciences University , Portland , Oregon 97239 , United States
| | - Ninian J Blackburn
- Department of Chemical Physiology and Biochemistry , Oregon Health & Sciences University , Portland , Oregon 97239 , United States
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15
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Neupane DP, Fullam SH, Chacón KN, Yukl ET. Crystal structures of AztD provide mechanistic insights into direct zinc transfer between proteins. Commun Biol 2019; 2:308. [PMID: 31428696 PMCID: PMC6689063 DOI: 10.1038/s42003-019-0542-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 07/15/2019] [Indexed: 12/19/2022] Open
Abstract
Zinc acquisition from limited environments is critical for bacterial survival and pathogenesis. AztD has been identified as a periplasmic or cell surface zinc-binding protein in numerous bacterial species. In Paracoccus denitrificans, AztD can transfer zinc directly to AztC, the solute binding protein for a zinc-specific ATP-binding cassette transporter system, suggesting a role in zinc acquisition and homeostasis. Here, we present the first cry stal structures of AztD from P. denitrificans and tbe human pathogen Citrobacter koseri, revealing a beta-propeller fold and two high-affinity zinc-binding sites that are highly conserved among AztD homologs. These structures combined with transfer assays using WT and mutant proteins provide rare insight into the mechanism of direct zinc transfer from one protein to another. Given the importance of zinc import to bacterial pathogenesis, these insights may prove valuable to the development of zinc transfer inhibitors as antibiotics.
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Affiliation(s)
- Durga Prasad Neupane
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
| | - Stephanie Hope Fullam
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
| | | | - Erik Thomas Yukl
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003 USA
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16
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Pavlin M, Qasem Z, Sameach H, Gevorkyan-Airapetov L, Ritacco I, Ruthstein S, Magistrato A. Unraveling the Impact of Cysteine-to-Serine Mutations on the Structural and Functional Properties of Cu(I)-Binding Proteins. Int J Mol Sci 2019; 20:E3462. [PMID: 31337158 PMCID: PMC6679193 DOI: 10.3390/ijms20143462] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 07/09/2019] [Accepted: 07/11/2019] [Indexed: 02/03/2023] Open
Abstract
Appropriate maintenance of Cu(I) homeostasis is an essential requirement for proper cell function because its misregulation induces the onset of major human diseases and mortality. For this reason, several research efforts have been devoted to dissecting the inner working mechanism of Cu(I)-binding proteins and transporters. A commonly adopted strategy relies on mutations of cysteine residues, for which Cu(I) has an exquisite complementarity, to serines. Nevertheless, in spite of the similarity between these two amino acids, the structural and functional impact of serine mutations on Cu(I)-binding biomolecules remains unclear. Here, we applied various biochemical and biophysical methods, together with all-atom simulations, to investigate the effect of these mutations on the stability, structure, and aggregation propensity of Cu(I)-binding proteins, as well as their interaction with specific partner proteins. Among Cu(I)-binding biomolecules, we focused on the eukaryotic Atox1-ATP7B system, and the prokaryotic CueR metalloregulator. Our results reveal that proteins containing cysteine-to-serine mutations can still bind Cu(I) ions; however, this alters their stability and aggregation propensity. These results contribute to deciphering the critical biological principles underlying the regulatory mechanism of the in-cell Cu(I) concentration, and provide a basis for interpreting future studies that will take advantage of cysteine-to-serine mutations in Cu(I)-binding systems.
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Affiliation(s)
- Matic Pavlin
- CNR-IOM at SISSA, via Bonomea 265, 34135 Trieste, Italy
| | - Zena Qasem
- Department of Chemistry, Faculty of Exact Sciences, Bar Ilan University, Ramat-Gan 5290002, Israel
| | - Hila Sameach
- Department of Chemistry, Faculty of Exact Sciences, Bar Ilan University, Ramat-Gan 5290002, Israel
| | - Lada Gevorkyan-Airapetov
- Department of Chemistry, Faculty of Exact Sciences, Bar Ilan University, Ramat-Gan 5290002, Israel
| | - Ida Ritacco
- CNR-IOM at SISSA, via Bonomea 265, 34135 Trieste, Italy
| | - Sharon Ruthstein
- Department of Chemistry, Faculty of Exact Sciences, Bar Ilan University, Ramat-Gan 5290002, Israel.
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17
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Abstract
Metals and metalloids have been used alongside antibiotics in livestock production for a long time. The potential and acute negative impact on the environment and human health of these livestock feed supplements has prompted lawmakers to ban or discourage the use of some or all of these supplements. This article provides an overview of current use in the European Union and the United States, detected metal resistance determinants, and the proteins and mechanisms responsible for conferring copper and zinc resistance in bacteria. A detailed description of the most common copper and zinc metal resistance determinants is given to illustrate not only the potential danger of coselecting antibiotic resistance genes but also the potential to generate bacterial strains with an increased potential to be pathogenic to humans. For example, the presence of a 20-gene copper pathogenicity island is highlighted since bacteria containing this gene cluster could be readily isolated from copper-fed pigs, and many pathogenic strains, including Escherichia coli O104:H4, contain this potential virulence factor, suggesting a potential link between copper supplements in livestock and the evolution of pathogens.
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18
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Trapping intermediates in metal transfer reactions of the CusCBAF export pump of Escherichia coli. Commun Biol 2018; 1:192. [PMID: 30456313 PMCID: PMC6235853 DOI: 10.1038/s42003-018-0181-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 09/13/2018] [Indexed: 12/20/2022] Open
Abstract
Escherichia coli CusCBAF represents an important class of bacterial efflux pump exhibiting selectivity towards Cu(I) and Ag(I). The complex is comprised of three proteins: the CusA transmembrane pump, the CusB soluble adaptor protein, and the CusC outer-membrane pore, and additionally requires the periplasmic metallochaperone CusF. Here we used spectroscopic and kinetic tools to probe the mechanism of copper transfer between CusF and CusB using selenomethionine labeling of the metal-binding Met residues coupled to RFQ-XAS at the Se and Cu edges. The results indicate fast formation of a protein-protein complex followed by slower intra-complex metal transfer. An intermediate coordinated by ligands from each protein forms in 100 ms. Stopped-flow fluorescence of the capping CusF-W44 tryptophan that is quenched by metal transfer also supports this mechanism. The rate constants validate a process in which shared-ligand complex formation assists protein association, providing a driving force that raises the rate into the diffusion-limited regime.
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19
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Kline CD, Gambill BF, Mayfield M, Lutsenko S, Blackburn NJ. pH-regulated metal-ligand switching in the HM loop of ATP7A: a new paradigm for metal transfer chemistry. Metallomics 2017; 8:729-33. [PMID: 27242196 DOI: 10.1039/c6mt00062b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Cuproproteins such as PHM and DBM mature in late endosomal vesicles of the mammalian secretory pathway where changes in vesicle pH are employed for sorting and post-translational processing. Colocation with the P1B-type ATPase ATP7A suggests that the latter is the source of copper and supports a mechanism where selectivity in metal transfer is achieved by spatial colocation of partner proteins in their specific organelles or vesicles. In previous work we have suggested that a lumenal loop sequence located between trans-membrane helices TM1 and TM2 of the ATPase, and containing five histidines and four methionines, acts as an organelle-specific chaperone for metallation of the cuproproteins. The hypothesis posits that the pH of the vesicle regulates copper ligation and loop conformation via a mechanism which involves His to Met ligand switching induced by histidine protonation. Here we report the effect of pH on the HM loop copper coordination using X-ray absorption spectroscopy (XAS), and show via selenium substitution of the Met residues that the HM loop undergoes similar conformational switching to that found earlier for its partner PHM. We hypothesize that in the absence of specific chaperones, HM motifs provide a template for building a flexible, pH-sensitive transfer site whose structure and function can be regulated to accommodate the different active site structural elements and pH environments of its partner proteins.
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Affiliation(s)
- Chelsey D Kline
- Institute of Environmental Health, Oregon Health and Sciences University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA.
| | - Benjamin F Gambill
- Institute of Environmental Health, Oregon Health and Sciences University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA.
| | - Mary Mayfield
- Institute of Environmental Health, Oregon Health and Sciences University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA.
| | - Svetlana Lutsenko
- Department of Physiology, The Johns Hopkins University, Baltimore, Maryland 21205, USA
| | - Ninian J Blackburn
- Institute of Environmental Health, Oregon Health and Sciences University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA.
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20
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Nies DH. The biological chemistry of the transition metal "transportome" of Cupriavidus metallidurans. Metallomics 2017; 8:481-507. [PMID: 27065183 DOI: 10.1039/c5mt00320b] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review tries to illuminate how the bacterium Cupriavidus metallidurans CH34 is able to allocate essential transition metal cations to their target proteins although these metals have similar charge-to-surface ratios and chemical features, exert toxic effects, compete with each other, and occur in the bacterial environment over a huge range of concentrations and speciations. Central to this ability is the "transportome", the totality of all interacting metal import and export systems, which, as an emergent feature, transforms the environmental metal content and speciation into the cellular metal mélange. In a kinetic flow equilibrium resulting from controlled uptake and efflux reactions, the periplasmic and cytoplasmic metal content is adjusted in a way that minimizes toxic effects. A central core function of the transportome is to shape the metal ion composition using high-rate and low-specificity reactions to avoid time and/or energy-requiring metal discrimination reactions. This core is augmented by metal-specific channels that may even deliver metals all the way from outside of the cell to the cytoplasm. This review begins with a description of the basic chemical features of transition metal cations and the biochemical consequences of these attributes, and which transition metals are available to C. metallidurans. It then illustrates how the environment influences the metal content and speciation, and how the transportome adjusts this metal content. It concludes with an outlook on the fate of metals in the cytoplasm. By generalization, insights coming from C. metallidurans shed light on multiple transition metal homoeostatic mechanisms in all kinds of bacteria including pathogenic species, where the "battle" for metals is an important part of the host-pathogen interaction.
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Affiliation(s)
- Dietrich H Nies
- Molecular Microbiology, Institute for Biology/Microbiology, Martin-Luther-University Halle-Wittenberg, Germany.
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21
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Adaptor protein mediates dynamic pump assembly for bacterial metal efflux. Proc Natl Acad Sci U S A 2017; 114:6694-6699. [PMID: 28607072 DOI: 10.1073/pnas.1704729114] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Multicomponent efflux complexes constitute a primary mechanism for Gram-negative bacteria to expel toxic molecules for survival. As these complexes traverse the periplasm and link inner and outer membranes, it remains unclear how they operate efficiently without compromising periplasmic plasticity. Combining single-molecule superresolution imaging and genetic engineering, we study in living Escherichia coli cells the tripartite efflux complex CusCBA of the resistance-nodulation-division family that is essential for bacterial resistance to drugs and toxic metals. We find that CusCBA complexes are dynamic structures and shift toward the assembled form in response to metal stress. Unexpectedly, the periplasmic adaptor protein CusB is a key metal-sensing element that drives the assembly of the efflux complex ahead of the transcription activation of the cus operon for defending against metals. This adaptor protein-mediated dynamic pump assembly allows the bacterial cell for efficient efflux upon cellular demand while still maintaining periplasmic plasticity; this could be broadly relevant to other multicomponent efflux systems.
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22
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Sahlberg Bang C, Demirel I, Kruse R, Persson K. Global gene expression profiling and antibiotic susceptibility after repeated exposure to the carbon monoxide-releasing molecule-2 (CORM-2) in multidrug-resistant ESBL-producing uropathogenic Escherichia coli. PLoS One 2017; 12:e0178541. [PMID: 28591134 PMCID: PMC5462378 DOI: 10.1371/journal.pone.0178541] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 05/15/2017] [Indexed: 12/02/2022] Open
Abstract
Treatment of urinary tract infections is today a challenge due to the increasing prevalence of multidrug-resistant ESBL-producing uropathogenic Escherichia coli (UPEC). There is an urgent need for new treatment strategies for multidrug-resistant UPEC and preferably with targets that have low potential for development of resistance. Carbon monoxide-releasing molecules (CORMs) are novel and potent antibacterial agents. The present study examines the transcriptomic targets of CORM-2 in a multidrug-resistant ESBL-producing UPEC isolate in response to a single exposure to CORM-2 and after repeated exposure to CORM-2. The bacterial viability and minimal inhibitory concentration (MIC) were also examined after repeated exposure to CORM-2. Microarray analysis revealed that a wide range of processes were affected by CORM-2, including a general trend of down-regulation in energy metabolism and biosynthesis pathways and up-regulation of the SOS response and DNA repair. Several genes involved in virulence (ibpB), antibiotic resistance (marAB, mdtABC) and biofilm formation (bhsA, yfgF) were up-regulated, while some genes involved in virulence (kpsC, fepCEG, entABE), antibiotic resistance (evgA) and biofilm formation (artIP) were down-regulated. Repeated exposure to CORM-2 did not alter the gene expression patterns, the growth inhibitory response to CORM-2 or the MIC values for CORM-2, cefotaxime, ciprofloxacin and trimethoprim. This study identifies several enriched gene ontologies, modified pathways and single genes that are targeted by CORM-2 in a multidrug-resistant UPEC isolate. Repeated exposure to CORM-2 did not change the gene expression patterns or fold changes and the susceptibility to CORM-2 remained after repeated exposure.
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Affiliation(s)
- Charlotte Sahlberg Bang
- School of Medical Sciences, Faculty of Medicine and Health, iRiSC—Inflammatory Response and Infection Susceptibility Centre, Örebro University, Örebro, Sweden
- * E-mail:
| | - Isak Demirel
- School of Medical Sciences, Faculty of Medicine and Health, iRiSC—Inflammatory Response and Infection Susceptibility Centre, Örebro University, Örebro, Sweden
| | - Robert Kruse
- School of Medical Sciences, Faculty of Medicine and Health, iRiSC—Inflammatory Response and Infection Susceptibility Centre, Örebro University, Örebro, Sweden
| | - Katarina Persson
- School of Medical Sciences, Faculty of Medicine and Health, iRiSC—Inflammatory Response and Infection Susceptibility Centre, Örebro University, Örebro, Sweden
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23
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Amolegbe SA, Akinremi CA, Adewuyi S, Lawal A, Bamigboye MO, Obaleye JA. Some nontoxic metal-based drugs for selected prevalent tropical pathogenic diseases. J Biol Inorg Chem 2016; 22:1-18. [DOI: 10.1007/s00775-016-1421-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Accepted: 11/18/2016] [Indexed: 02/04/2023]
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24
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Urbina P, Bersch B, De Angelis F, Derfoufi KM, Prévost M, Goormaghtigh E, Vandenbussche G. Structural and Functional Investigation of the Ag+/Cu+ Binding Domains of the Periplasmic Adaptor Protein SilB from Cupriavidus metallidurans CH34. Biochemistry 2016; 55:2883-97. [DOI: 10.1021/acs.biochem.6b00022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Patricia Urbina
- Laboratory
for the Structure and Function of Biological Membranes, Center for
Structural Biology and Bioinformatics, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - Beate Bersch
- Institut
de Biologie Structurale (IBS), Univ. Grenoble Alpes, CEA, CNRS, 38044 Grenoble, France
| | - Fabien De Angelis
- Laboratory
for the Structure and Function of Biological Membranes, Center for
Structural Biology and Bioinformatics, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - Kheiro-Mouna Derfoufi
- Laboratory
for the Structure and Function of Biological Membranes, Center for
Structural Biology and Bioinformatics, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - Martine Prévost
- Laboratory
for the Structure and Function of Biological Membranes, Center for
Structural Biology and Bioinformatics, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - Erik Goormaghtigh
- Laboratory
for the Structure and Function of Biological Membranes, Center for
Structural Biology and Bioinformatics, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
| | - Guy Vandenbussche
- Laboratory
for the Structure and Function of Biological Membranes, Center for
Structural Biology and Bioinformatics, Université Libre de Bruxelles, B-1050 Bruxelles, Belgium
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25
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Martin-Diaconescu V, Chacón KN, Delgado-Jaime MU, Sokaras D, Weng TC, DeBeer S, Blackburn NJ. Kβ Valence to Core X-ray Emission Studies of Cu(I) Binding Proteins with Mixed Methionine - Histidine Coordination. Relevance to the Reactivity of the M- and H-sites of Peptidylglycine Monooxygenase. Inorg Chem 2016; 55:3431-9. [PMID: 26965786 PMCID: PMC4878823 DOI: 10.1021/acs.inorgchem.5b02842] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Biological systems use copper as a redox center in many metalloproteins, where the role of the metal is to cycle between its +1 and +2 oxidation states. This chemistry requires the redox potential to be in a range that can stabilize both Cu(I) and Cu(II) states and often involves protein-derived ligand sets involving mixed histidine-methionine coordination that balance the preferences of both oxidation states. Transport proteins, on the other hand, utilize copper in the Cu(I) state and often contain sites comprised predominately of the cuprophilic residue methionine. The electronic factors that allow enzymes and transporters to balance their redox requirements are complex and are often elusive due to the dearth of spectroscopic probes of the Cu(I) state. Here we present the novel application of X-ray emission spectroscopy to copper proteins via a study of a series of mixed His-Met copper sites where the ligand set varies in a systematic way between the His3 and Met3 limits. The sites are derived from the wild-type peptidylglycine monooxygenase (PHM), two single-site variants which replicate each of its two copper sites (CuM-site and CuH-site), and the transporters CusF and CusB. Clear differences are observed in the Kβ2,5 region at the Met3 and His3 limits. CusB (Met3) has a distinct peak at 8978.4 eV with a broad shoulder at 8975.6 eV, whereas CuH (His3) has two well-resolved features: a more intense feature at 8974.8 eV and a second at 8977.2 eV. The mixed coordination sphere CusF (Met2His) and the PHM CuM variant (Met1His2) have very similar spectra consisting of two features at 8975.2 and 8977.8 eV. An analysis of DFT calculated spectra indicate that the intensity of the higher energy peak near 8978 eV is mediated by mixing of ligand-based orbitals into the Cu d(10) manifold, with S from Met providing more intensity by facilitating increased Cu p-d mixing. Furthermore, reaction of WT PHM with CO (an oxygen analogue) produced the M site CO complex, which showed a unique XES spectrum that could be computationally reproduced by including interactions between Cu(I) and the CO ligand. The study suggests that the valence-to-core (VtC) region can not only serve as a probe of ligand speciation but also offer insight into the coordination geometry, in a fashion similar to XAS pre-edges, and may be sufficiently sensitive to the coordination of exogenous ligands to be useful in the study of reaction mechanisms.
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Affiliation(s)
- Vlad Martin-Diaconescu
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34 – 36, D-45470 Mülheim an der Ruhr, Mülheim an der Ruhr, Germany
| | - Kelly N. Chacón
- Institute of Environmental Health, Oregon Health & Sciences University, 3181 SW Sam Jackson Park Road, Portland, OR 97239
| | - Mario Ulises Delgado-Jaime
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34 – 36, D-45470 Mülheim an der Ruhr, Mülheim an der Ruhr, Germany
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Road, Menlo Park, CA 97025
| | - Tsu-Chien Weng
- Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Road, Menlo Park, CA 97025
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34 – 36, D-45470 Mülheim an der Ruhr, Mülheim an der Ruhr, Germany
- Cornell University, Department of Chemistry and Chemical Biology, Ithaca, New York, 14853, United States
| | - Ninian J. Blackburn
- Institute of Environmental Health, Oregon Health & Sciences University, 3181 SW Sam Jackson Park Road, Portland, OR 97239
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26
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The Role of Bacterial Spores in Metal Cycling and Their Potential Application in Metal Contaminant Bioremediation. Microbiol Spectr 2016; 4. [DOI: 10.1128/microbiolspec.tbs-0018-2013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
ABSTRACT
Bacteria are one of the premier biological forces that, in combination with chemical and physical forces, drive metal availability in the environment. Bacterial spores, when found in the environment, are often considered to be dormant and metabolically inactive, in a resting state waiting for favorable conditions for them to germinate. However, this is a highly oversimplified view of spores in the environment. The surface of bacterial spores represents a potential site for chemical reactions to occur. Additionally, proteins in the outer layers (spore coats or exosporium) may also have more specific catalytic activity. As a consequence, bacterial spores can play a role in geochemical processes and may indeed find uses in various biotechnological applications. The aim of this review is to introduce the role of bacteria and bacterial spores in biogeochemical cycles and their potential use as toxic metal bioremediation agents.
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27
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Ouyang F, Zhai H, Ji M, Zhang H, Dong Z. Physiological and transcriptional responses of nitrifying bacteria exposed to copper in activated sludge. JOURNAL OF HAZARDOUS MATERIALS 2016; 301:172-178. [PMID: 26348150 DOI: 10.1016/j.jhazmat.2015.08.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 08/04/2015] [Accepted: 08/22/2015] [Indexed: 06/05/2023]
Abstract
Cu inhibition of gene transcription in ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) were rarely studied simultaneously in activated sludge. In this study, the transcription of amoA (for AOB) and nxrB (for NOB), nitrification efficiencies, AOB and NOB respiratory rates, and Cu distribution were simultaneously investigated. Modeling the relationships among the aforementioned parameters revealed that in complex activated sludge systems, nitrification efficiency was an insensitive parameter for showing Cu inhibition. Respiration activities and gene transcription were sensitive to Cu and positively correlated with each other. The transcription of amoA and nxrB genes indicated that the Cu had different inhibitory effects on AOB and NOB. AOB were more susceptible to Cu toxicity than NOB. Moreover, the degree of Cu inhibition on ammonia oxidation was greater than on nitrite oxidation. The analysis and related modeling results indicate that the inhibitory actions of Cu on nitrifying bacteria could mainly be attributed to intracellular Cu. The findings from this study provide insight into the mechanism of Cu inhibition on nitrification in complex activated sludge systems.
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Affiliation(s)
- Fan Ouyang
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China
| | - Hongyan Zhai
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China.
| | - Min Ji
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China
| | - Hongyang Zhang
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin 300072, China; Anhui Urban & Rural Planning and Design Institute, South Tongcheng Road 363, Hefei 230022, Anhui, China
| | - Zhao Dong
- Harvard T. H. Chan School of Public Health, Department of Environmental Health, 401 Park Drive, Landmark Center West 415, Boston, MA 02215, USA
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Handali M, Roychowdhury H, Neupane DP, Yukl ET. AztD, a Periplasmic Zinc Metallochaperone to an ATP-binding Cassette (ABC) Transporter System in Paracoccus denitrificans. J Biol Chem 2015; 290:29984-92. [PMID: 26468286 DOI: 10.1074/jbc.m115.684506] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Indexed: 11/06/2022] Open
Abstract
Bacterial ATP-binding cassette (ABC) transporters of transition metals are essential for acquisition of necessary elements from the environment. A large number of Gram-negative bacteria, including human pathogens, have a fourth conserved gene of unknown function adjacent to the canonical permease, ATPase, and solute-binding protein (SBP) genes of the AztABC zinc transporter system. To assess the function of this putative accessory factor (AztD) from Paracoccus denitrificans, we have analyzed its transcriptional regulation, metal binding properties, and interaction with the SBP (AztC). Transcription of the aztD gene is significantly up-regulated under conditions of zinc starvation. Recombinantly expressed AztD purifies with slightly substoichiometric zinc from the periplasm of Escherichia coli and is capable of binding up to three zinc ions with high affinity. Size exclusion chromatography and a simple intrinsic fluorescence assay were used to determine that AztD as isolated is able to transfer bound zinc nearly quantitatively to apo-AztC. Transfer occurs through a direct, associative mechanism that prevents loss of metal to the solvent. These results indicate that AztD is a zinc chaperone to AztC and likely functions to maintain zinc homeostasis through interaction with the AztABC system. This work extends our understanding of periplasmic zinc trafficking and the function of chaperones in this process.
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Affiliation(s)
- Melody Handali
- From the Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003
| | - Hridindu Roychowdhury
- From the Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003
| | - Durga P Neupane
- From the Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003
| | - Erik T Yukl
- From the Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003
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Abstract
This chapter focuses on transition metals. All transition metal cations are toxic-those that are essential for Escherichia coli and belong to the first transition period of the periodic system of the element and also the "toxic-only" metals with higher atomic numbers. Common themes are visible in the metabolism of these ions. First, there is transport. High-rate but low-affinity uptake systems provide a variety of cations and anions to the cells. Control of the respective systems seems to be mainly through regulation of transport activity (flux control), with control of gene expression playing only a minor role. If these systems do not provide sufficient amounts of a needed ion to the cell, genes for ATP-hydrolyzing high-affinity but low-rate uptake systems are induced, e.g., ABC transport systems or P-type ATPases. On the other hand, if the amount of an ion is in surplus, genes for efflux systems are induced. By combining different kinds of uptake and efflux systems with regulation at the levels of gene expression and transport activity, the concentration of a single ion in the cytoplasm and the composition of the cellular ion "bouquet" can be rapidly adjusted and carefully controlled. The toxicity threshold of an ion is defined by its ability to produce radicals (copper, iron, chromate), to bind to sulfide and thiol groups (copper, zinc, all cations of the second and third transition period), or to interfere with the metabolism of other ions. Iron poses an exceptional metabolic problem due its metabolic importance and the low solubility of Fe(III) compounds, combined with the ability to cause dangerous Fenton reactions. This dilemma for the cells led to the evolution of sophisticated multi-channel iron uptake and storage pathways to prevent the occurrence of unbound iron in the cytoplasm. Toxic metals like Cd2+ bind to thiols and sulfide, preventing assembly of iron complexes and releasing the metal from iron-sulfur clusters. In the unique case of mercury, the cation can be reduced to the volatile metallic form. Interference of nickel and cobalt with iron is prevented by the low abundance of these metals in the cytoplasm and their sequestration by metal chaperones, in the case of nickel, or by B12 and its derivatives, in the case of cobalt. The most dangerous metal, copper, catalyzes Fenton-like reactions, binds to thiol groups, and interferes with iron metabolism. E. coli solves this problem probably by preventing copper uptake, combined with rapid efflux if the metal happens to enter the cytoplasm.
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Ucisik MN, Chakravorty DK, Merz KM. Models for the Metal Transfer Complex of the N-Terminal Region of CusB and CusF. Biochemistry 2015; 54:4226-35. [PMID: 26079272 DOI: 10.1021/acs.biochem.5b00195] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The tripartite CusCFBA pump in Escherichia coli is a very effective heavy metal extrusion system specific for Cu(I) and Ag(I). The N-terminal region of the membrane fusion protein CusB (CusB-NT) is highly disordered, and hence, experimentally characterizing its structure is challenging. In a previous study, this disorder was confirmed with molecular dynamics simulations, although some key structural elements were determined. It was experimentally shown that CusB-NT is fully functional in transferring the metal from the metallochaperone CusF. In this study, we docked these two entities together and formed two representative metal coordination modes, which consist of residues from both proteins. In this way, we created two potential CusB-NT/CusF complexes that share coordination of Cu(I) and thereby represent structural models for the metal transfer process. Each model complex was simulated for 4 μs. The previously observed structural disorder in CusB-NT disappeared upon complexation with CusF. The only differences between the two models occurred in the M21-M36 loop region of CusB-NT and the open flap of CusF: we observed the model with two CusB-NT methionine residues and a CusF methionine as the metal coordination site (termed "MMM") to be more stable than the model with a CusB-NT methionine, a CusF methionine, and a CusF histidine ligating the metal (termed "MMH"). The observed stability of the MMM model was probed for an additional 2 μs, yielding a total simulation time of 6 μs. We hypothesize that both MMM and MMH configurations might take part in the metal exchange process in which the MMH configuration would appear first and would be followed by the MMM configuration. Given the experimental finding of comparable binding affinities of CusB-NT and CusF, the increased stability of the MMM configuration might be a determinant for the transfer from CusF to CusB-NT. The metal would be transferred from the more CusF-dominated metal binding environment (MMH model) to a more CusB-dominated one (MMM model) in which the coordination environment is more stable. From the MMM model, the metal ion would ultimately be coordinated by the CusB methionines only, which would complete the Cu(I) transfer process.
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Affiliation(s)
- Melek N Ucisik
- †Department of Chemistry and Quantum Theory Project, University of Florida, 2328 New Physics Building, P.O. Box 118435, Gainesville, Florida 32611-8435, United States.,‡Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801-3364, United States
| | - Dhruva K Chakravorty
- §Department of Chemistry, University of New Orleans, 2000 Lake Shore Drive, New Orleans, Louisiana 70148, United States
| | - Kenneth M Merz
- ∥Institute for Cyber Enabled Research, Department of Chemistry, and Department of Biochemistry and Molecular Biology, Michigan State University, 578 South Shaw Lane, East Lansing, Michigan 48824-1322, United States
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31
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Symmons MF, Marshall RL, Bavro VN. Architecture and roles of periplasmic adaptor proteins in tripartite efflux assemblies. Front Microbiol 2015; 6:513. [PMID: 26074901 PMCID: PMC4446572 DOI: 10.3389/fmicb.2015.00513] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 05/08/2015] [Indexed: 12/12/2022] Open
Abstract
Recent years have seen major advances in the structural understanding of the different components of tripartite efflux assemblies, which encompass the multidrug efflux (MDR) pumps and type I secretion systems. The majority of these investigations have focused on the role played by the inner membrane transporters and the outer membrane factor (OMF), leaving the third component of the system – the Periplasmic Adaptor Proteins (PAPs) – relatively understudied. Here we review the current state of knowledge of these versatile proteins which, far from being passive linkers between the OMF and the transporter, emerge as active architects of tripartite assemblies, and play diverse roles in the transport process. Recognition between the PAPs and OMFs is essential for pump assembly and function, and targeting this interaction may provide a novel avenue for combating multidrug resistance. With the recent advances elucidating the drug efflux and energetics of the tripartite assemblies, the understanding of the interaction between the OMFs and PAPs is the last piece remaining in the complete structure of the tripartite pump assembly puzzle.
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Affiliation(s)
- Martyn F Symmons
- Department of Veterinary Medicine, University of Cambridge Cambridge, UK
| | - Robert L Marshall
- Institute of Microbiology and Infection, University of Birmingham Birmingham, UK
| | - Vassiliy N Bavro
- Institute of Microbiology and Infection, University of Birmingham Birmingham, UK
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32
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Meir A, Natan A, Moskovitz Y, Ruthstein S. EPR spectroscopy identifies Met and Lys residues that are essential for the interaction between the CusB N-terminal domain and metallochaperone CusF. Metallomics 2015; 7:1163-72. [PMID: 25940871 DOI: 10.1039/c5mt00053j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper plays a key role in all living organisms by serving as a cofactor for a large variety of proteins and enzymes involved in electron transfer, oxidase and oxygenase activities, and the detoxification of oxygen radicals. Due to its toxicity, a conserved homeostasis mechanism is required. In E. coli, the CusCFBA efflux system is a copper-regulating system and is responsible for transferring Cu(I) and Ag(I) out of the periplasm domain into the extracellular domain. Two of the components of this efflux system, the CusF metallochaperone and the N-terminal domain of CusB, have been thought to play significant roles in the function of this efflux system. Resolving the metal ion transport mechanism through this efflux system is vital for understanding metal- and multidrug-resistant microorganisms. This work explores one aspect of the E. coli resistance mechanism by observing the interaction between the N-terminal domain of CusB and the CusF protein, using electron paramagnetic resonance (EPR) spectroscopy, circular dichroism (CD), and chemical cross-linking. The data summarized here show that M36 and M38 of CusB are important residues for both the Cu(I) coordination to the CusB N-terminal domain and the interaction with CusF, and K32 is essential for the interaction with CusF. In contrast, the K29 residue is less consequential for the interaction with CusF, whereas M21 is mostly important for the proper interaction with CusF.
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Affiliation(s)
- Aviv Meir
- Department of Chemistry, Faculty of Exact Science, Bar Ilan University, Ramat Gan, 5290002, Israel.
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33
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Johnstone TC, Nolan EM. Beyond iron: non-classical biological functions of bacterial siderophores. Dalton Trans 2015; 44:6320-39. [PMID: 25764171 PMCID: PMC4375017 DOI: 10.1039/c4dt03559c] [Citation(s) in RCA: 245] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Bacteria secrete small molecules known as siderophores to acquire iron from their surroundings. For over 60 years, investigations into the bioinorganic chemistry of these molecules, including fundamental coordination chemistry studies, have provided insight into the crucial role that siderophores play in bacterial iron homeostasis. The importance of understanding the fundamental chemistry underlying bacterial life has been highlighted evermore in recent years because of the emergence of antibiotic-resistant bacteria and the need to prevent the global rise of these superbugs. Increasing reports of siderophores functioning in capacities other than iron transport have appeared recently, but reports of "non-classical" siderophore functions have long paralleled those of iron transport. One particular non-classical function of these iron chelators, namely antibiotic activity, was documented before the role of siderophores in iron transport was established. In this Perspective, we present an exposition of past and current work into non-classical functions of siderophores and highlight the directions in which we anticipate that this research is headed. Examples include the ability of siderophores to function as zincophores, chalkophores, and metallophores for a variety of other metals, sequester heavy metal toxins, transport boron, act as signalling molecules, regulate oxidative stress, and provide antibacterial activity.
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Affiliation(s)
- Timothy C Johnstone
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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34
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Randall CP, Gupta A, Jackson N, Busse D, O'Neill AJ. Silver resistance in Gram-negative bacteria: a dissection of endogenous and exogenous mechanisms. J Antimicrob Chemother 2015; 70:1037-46. [PMID: 25567964 PMCID: PMC4356207 DOI: 10.1093/jac/dku523] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Objectives To gain a more detailed understanding of endogenous (mutational) and exogenous (horizontally acquired) resistance to silver in Gram-negative pathogens, with an emphasis on clarifying the genetic bases for resistance. Methods A suite of microbiological and molecular genetic techniques was employed to select and characterize endogenous and exogenous silver resistance in several Gram-negative species. Results In Escherichia coli, endogenous resistance arose after 6 days of exposure to silver, a consequence of two point mutations that were both necessary and sufficient for the phenotype. These mutations, in ompR and cusS, respectively conferred loss of the OmpC/F porins and derepression of the CusCFBA efflux transporter, both phenotypic changes previously linked to reduced intracellular accumulation of silver. Exogenous resistance involved derepression of the SilCFBA efflux transporter as a consequence of mutation in silS, but was additionally contingent on expression of the periplasmic silver-sequestration protein SilE. Silver resistance could be selected at high frequency (>10−9) from Enterobacteriaceae lacking OmpC/F porins or harbouring the sil operon and both endogenous and exogenous resistance were associated with modest fitness costs in vitro. Conclusions Both endogenous and exogenous silver resistance are dependent on the derepressed expression of closely related efflux transporters and are therefore mechanistically similar phenotypes. The ease with which silver resistance can become selected in some bacterial pathogens in vitro suggests that there would be benefit in improved surveillance for silver-resistant isolates in the clinic, along with greater control over use of silver-containing products, in order to best preserve the clinical utility of silver.
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Affiliation(s)
- Christopher P Randall
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Arya Gupta
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Nicole Jackson
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - David Busse
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Alex J O'Neill
- Antimicrobial Research Centre and School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
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Giner-Lamia J, López-Maury L, Florencio FJ. CopM is a novel copper-binding protein involved in copper resistance in Synechocystis sp. PCC 6803. Microbiologyopen 2014; 4:167-85. [PMID: 25545960 PMCID: PMC4335983 DOI: 10.1002/mbo3.231] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 11/13/2014] [Accepted: 11/20/2014] [Indexed: 01/15/2023] Open
Abstract
Copper resistance system in the cyanobacterium Synechocystis sp. PCC 6803 comprises two operons, copMRS and copBAC, which are expressed in response to copper in the media. copBAC codes for a heavy-metal efflux–resistance nodulation and division (HME-RND) system, while copMRS codes for a protein of unknown function, CopM, and a two-component system CopRS, which controls the expression of these two operons. Here, we report that CopM is a periplasmic protein able to bind Cu(I) with high affinity (KD ∼3 × 10−16). Mutants lacking copM showed a sensitive copper phenotype similar to mutants affected in copB, but lower than mutants of the two-component system CopRS, suggesting that CopBAC and CopM constitute two independent resistance mechanisms. Moreover, constitutive expression of copM is able to partially suppress the copper sensitivity of the copR mutant strain, pointing out that CopM per se is able to confer copper resistance. Furthermore, constitutive expression of copM was able to reduce total cellular copper content of the copR mutant to the levels determined in the wild-type (WT) strain. Finally, CopM was localized not only in the periplasm but also in the extracellular space, suggesting that CopM can also prevent copper accumulation probably by direct copper binding outside the cell.
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Affiliation(s)
- Joaquín Giner-Lamia
- Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla-CSIC, Américo Vespucio 49, E-41092, Sevilla, Spain
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Fu Y, Chang FMJ, Giedroc DP. Copper transport and trafficking at the host-bacterial pathogen interface. Acc Chem Res 2014; 47:3605-13. [PMID: 25310275 PMCID: PMC4268108 DOI: 10.1021/ar500300n] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
![]()
The human innate immune system has evolved the
means to reduce
the bioavailability of first-row late d-block transition metal ions
to invading microbial pathogens in a process termed “nutritional
immunity”. Transition metals from Mn(II) to Zn(II) function
as metalloenzyme cofactors in all living cells, and the successful
pathogen is capable of mounting an adaptive response to mitigate the
effects of host control of transition metal bioavailability. Emerging
evidence suggests that Mn, Fe, and Zn are withheld from the pathogen
in classically defined nutritional immunity, while Cu is used to kill
invading microorganisms. This Account summarizes new molecular-level
insights into copper trafficking across cell membranes from studies
of a number of important bacterial pathogens and model organisms,
including Escherichia coli, Salmonella species, Mycobacterium tuberculosis, and Streptococcus pneumoniae, to illustrate general principles
of cellular copper resistance. Recent highlights of copper chemistry
at the host–microbial
pathogen interface include the first high resolution structures and
functional characterization of a Cu(I)-effluxing P1B-ATPase,
a new class of bacterial copper chaperone, a fungal Cu-only superoxide
dismutase SOD5, and the discovery of a small molecule Cu-bound SOD
mimetic. Successful harnessing by the pathogen of host-derived bactericidal
Cu to reduce the bacterial load of reactive oxygen species (ROS) is
an emerging theme; in addition, recent studies continue to emphasize
the importance of short lifetime protein–protein interactions
that orchestrate the channeling of Cu(I) from donor to target without
dissociation into bulk solution; this, in turn, mitigates the off-pathway
effects of Cu(I) toxicity in both the periplasm in Gram negative organisms
and in the bacterial cytoplasm. It is unclear as yet, outside of the
photosynthetic bacteria, whether Cu(I) is trafficked to other cellular
destinations, for example, to cuproenzymes or other intracellular
storage sites, or the general degree to which copper chaperones vs
copper efflux transporters are essential for bacterial pathogenesis
in the vertebrate host. Future studies will be directed toward
the identification and structural
characterization of other cellular targets of Cu(I) trafficking and
resistance, the physical and mechanistic characterization of Cu(I)-transfer
intermediates, and elucidation of the mutual dependence of Cu(I) trafficking
and cellular redox status on thiol chemistry in the cytoplasm. Crippling
bacterial control of Cu(I) sensing, trafficking, and efflux may represent
a viable strategy for the development of new antibiotics.
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Affiliation(s)
- Yue Fu
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
- Interdisciplinary Graduate Program in Biochemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Feng-Ming James Chang
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
| | - David P. Giedroc
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
- Department of Molecular and Cellular Biochemistry, Indiana University, Bloomington, Indiana 47405, United States
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37
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Sohm B, Immel F, Bauda P, Pagnout C. Insight into the primary mode of action of TiO2 nanoparticles on Escherichia coli in the dark. Proteomics 2014; 15:98-113. [PMID: 25346333 DOI: 10.1002/pmic.201400101] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 09/22/2014] [Accepted: 10/20/2014] [Indexed: 11/09/2022]
Abstract
Large-scale production and incorporation of titanium dioxide nanoparticles (NP-TiO2 ) in consumer products leads to their potential release into the environment and raises the question of their toxicity. The bactericidal mechanism of NP-TiO2 under UV light is known to involve oxidative stress due to the generation of reactive oxygen species. In the dark, several studies revealed that NP-TiO2 can exert toxicological effects. However, the mode of action of these nanoparticles is still controversial. In the present study, we used a combination of fluorescent probes to show that NP-TiO2 causes Escherichia coli membrane depolarization and loss of integrity, leading to higher cell permeability. Using both transcriptomic and proteomic global approaches we showed that this phenomenon translates into a cellular response to osmotic stress, metabolism of cell envelope components and uptake/metabolism of endogenous and exogenous compounds. This primary mechanism of bacterial NP-TiO2 toxicity is supported by the observed massive cell leakage of K(+) /Mg(2+) concomitant with the entrance of extracellular Na(+), and by the depletion of intracellular ATP level.
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Affiliation(s)
- Bénédicte Sohm
- Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC), UMR 7360, Université de Lorraine, Metz, France; CNRS, LIEC, UMR 7360, Metz, France
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38
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Tracking metal ions through a Cu/Ag efflux pump assigns the functional roles of the periplasmic proteins. Proc Natl Acad Sci U S A 2014; 111:15373-8. [PMID: 25313055 DOI: 10.1073/pnas.1411475111] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Copper is an essential nutrient for all aerobic organisms but is toxic in excess. At the host-pathogen interface, macrophages respond to bacterial infection by copper-dependent killing mechanisms, whereas the invading bacteria are thought to counter with an up-regulation of copper transporters and efflux pumps. The tripartite efflux pump CusCBA and its metallochaperone CusF are vital to the detoxification of copper and silver ions in the periplasm of Escherichia coli. However, the mechanism of efflux by this complex, which requires the activation of the inner membrane pump CusA, is poorly understood. Here, we use selenomethionine (SeM) active site labels in a series of biological X-ray absorption studies at the selenium, copper, and silver edges to establish a "switch" role for the membrane fusion protein CusB. We determine that metal-bound CusB is required for activation of cuprous ion transfer from CusF directly to a site in the CusA antiporter, showing for the first time (to our knowledge) the in vitro activation of the Cus efflux pump. This metal-binding site of CusA is unlike that observed in the crystal structures of the CusA protein and is composed of one oxygen and two sulfur ligands. Our results suggest that metal transfer occurs between CusF and apo-CusB, and that, when metal-loaded, CusB plays a role in the regulation of metal ion transfer from CusF to CusA in the periplasm.
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Abstract
Infections caused by bacteria are a leading cause of death worldwide. Although antibiotics remain a key clinical therapy, their effectiveness has been severely compromised by the development of drug resistance in bacterial pathogens. Multidrug efflux transporters--a common and powerful resistance mechanism--are capable of extruding a number of structurally unrelated antimicrobials from the bacterial cell, including antibiotics and toxic heavy metal ions, facilitating their survival in noxious environments. Transporters of the resistance-nodulation-cell division (RND) superfamily typically assemble as tripartite efflux complexes spanning the inner and outer membranes of the cell envelope. In Escherichia coli, the CusCFBA complex, which mediates resistance to copper(I) and silver(I) ions, is the only known RND transporter specific to heavy metals. Here, we describe the current knowledge of individual pump components of the Cus system, a paradigm for efflux machinery, and speculate on how RND pumps assemble to fight diverse antimicrobials.
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40
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Le Brun NE. Copper in Prokaryotes. BINDING, TRANSPORT AND STORAGE OF METAL IONS IN BIOLOGICAL CELLS 2014. [DOI: 10.1039/9781849739979-00461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The ability of copper to cycle its oxidation state, and to form high-affinity complexes with a range of biologically relevant ligands, underpins the central role that this metal plays in prokaryotic processes such as respiration, oxidative stress response, the nitrogen cycle and pigmentation. However, the very properties that nature has exploited also mean that copper is extremely toxic. To minimize this toxicity, while also ensuring sufficient supply of the metal, complex systems of trafficking evolved to facilitate transport of copper (as Cu(I)) across membranes and its targeted distribution within the cytoplasm, membrane and periplasm. The past 20 years have seen our understanding of such systems grow enormously, and atomic/molecular and mechanistic detail of many of the major cellular trafficking components is now available. This chapter begins with a discussion of the chemistry of copper that is relevant for understanding the role of this metal throughout life. The subsequent focus is then on current understanding of copper homeostasis in prokaryotes, with eukaryotic copper homeostasis dealt with in the following chapters. The chapter aims to provide a chemical perspective on these complex biological systems, emphasizing the importance of thermodynamic and kinetic properties of copper and the complexes it forms.
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Affiliation(s)
- Nick E. Le Brun
- Centre for Molecular and Structural Biochemistry, School of Chemistry, University of East Anglia Norwich Research Park Norwich NR4 7TJ UK
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41
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Chaturvedi KS, Henderson JP. Pathogenic adaptations to host-derived antibacterial copper. Front Cell Infect Microbiol 2014; 4:3. [PMID: 24551598 PMCID: PMC3909829 DOI: 10.3389/fcimb.2014.00003] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 01/06/2014] [Indexed: 12/11/2022] Open
Abstract
Recent findings suggest that both host and pathogen manipulate copper content in infected host niches during infections. In this review, we summarize recent developments that implicate copper resistance as an important determinant of bacterial fitness at the host-pathogen interface. An essential mammalian nutrient, copper cycles between copper (I) (Cu(+)) in its reduced form and copper (II) (Cu(2+)) in its oxidized form under physiologic conditions. Cu(+) is significantly more bactericidal than Cu(2+) due to its ability to freely penetrate bacterial membranes and inactivate intracellular iron-sulfur clusters. Copper ions can also catalyze reactive oxygen species (ROS) generation, which may further contribute to their toxicity. Transporters, chaperones, redox proteins, receptors and transcription factors and even siderophores affect copper accumulation and distribution in both pathogenic microbes and their human hosts. This review will briefly cover evidence for copper as a mammalian antibacterial effector, the possible reasons for this toxicity, and pathogenic resistance mechanisms directed against it.
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Affiliation(s)
- Kaveri S Chaturvedi
- Division of Infectious Diseases, Department of Internal Medicine, Center for Women's Infectious Diseases Research, Washington University School of Medicine St. Louis, MO, USA
| | - Jeffrey P Henderson
- Division of Infectious Diseases, Department of Internal Medicine, Center for Women's Infectious Diseases Research, Washington University School of Medicine St. Louis, MO, USA
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42
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Molecular basis of active copper resistance mechanisms in Gram-negative bacteria. Cell Biol Toxicol 2013; 29:397-405. [PMID: 24072389 PMCID: PMC3847284 DOI: 10.1007/s10565-013-9262-1] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 09/16/2013] [Indexed: 10/26/2022]
Abstract
Copper is a metallic element that is crucial for cell metabolism; however, in extended concentrations, it is toxic for all living organisms. The dual nature of copper has forced organisms, including bacteria, to keep a tight hold on cellular copper content. This challenge has led to the evolution of complex mechanisms that on one hand enable them to deliver the essential element and on the other to protect cells against its toxicity. Such mechanisms have been found in both eukaryotic and prokaryotic cells. In bacteria a number of different systems such as extra- and intracellular sequestration, enzymatic detoxification, and metal removal from the cell enabling them to survive in the presence of high concentration of copper have been identified. Gram-negative bacteria, due to their additional compartment, need to deal with both cytoplasmic and periplasmic copper. Therefore, these bacteria have evolved intricate and precisely regulated systems which interact with each other. In this review the active mechanisms of copper resistance at their molecular level are discussed.
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Ucisik MN, Chakravorty DK, Merz KM. Structure and dynamics of the N-terminal domain of the Cu(I) binding protein CusB. Biochemistry 2013; 52:6911-23. [PMID: 23988152 DOI: 10.1021/bi400606b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
CusCFBA is one of the metal efflux systems in Escherichia coli that is highly specific for its substrates, Cu(I) and Ag(I). It serves to protect the bacteria in environments that have lethal concentrations of these metals. The membrane fusion protein CusB is the periplasmic piece of CusCFBA, which has not been fully characterized by crystallography because of its extremely disordered N-terminal region. This region has both structural and functional importance because it has been experimentally proven to transfer the metal by itself from the metallochaperone CusF and to induce a structural change in the rest of CusB to increase Cu(I)/Ag(I) resistance. Understanding metal uptake from the periplasm is critical to gain insight into the mechanism of the whole CusCFBA pump, which makes resolving a structure for the N-terminal region necessary because it contains the metal binding site. We ran extensive molecular dynamics simulations to reveal the structural and dynamic properties of both the apo and Cu(I)-bound versions of the CusB N-terminal region. In contrast to its functional companion CusF, Cu(I) binding to the N-terminus of CusB causes only a slight, local stabilization around the metal site. The trajectories were analyzed in detail, revealing extensive structural disorder in both the apo and holo forms of the protein. CusB was further analyzed by breaking the protein up into three subdomains according to the extent of the observed disorder: the N- and C-terminal tails, the central beta strand motif, and the M21-M36 loop connecting the two metal-coordinating methionine residues. Most of the observed disorder was traced back to the tail regions, leading us to hypothesize that the latter two subdomains (residues 13-45) may form a functionally competent metal-binding domain because the tail regions appear to play no role in metal binding.
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Affiliation(s)
- Melek N Ucisik
- Department of Chemistry and Quantum Theory Project, University of Florida , 2328 New Physics Building, P.O. Box 118435, Gainesville, Florida 32611-8435, United States
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Raimunda D, Padilla-Benavides T, Vogt S, Boutigny S, Tomkinson KN, Finney LA, Argüello JM. Periplasmic response upon disruption of transmembrane Cu transport in Pseudomonas aeruginosa. Metallomics 2013; 5:144-51. [PMID: 23354150 DOI: 10.1039/c2mt20191g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Pseudomonas aeruginosa, an opportunistic pathogen, has two transmembrane Cu(+) transport ATPases, CopA1 and CopA2. Both proteins export cytoplasmic Cu(+) into the periplasm and mutation of either gene leads to attenuation of virulence. CopA1 is required for maintaining cytoplasmic copper levels, while CopA2 provides copper for cytochrome c oxidase assembly. We hypothesized that transported Cu(+) ions would be directed to their destination via specific periplasmic partners and disruption of transport should affect the periplasmic copper homeostasis. Supporting this, mutation of either ATPase gene led to large increments in periplasmic cuproprotein levels. Toward identifying the proteins participating in this cellular response the periplasmic metalloproteome was resolved in non-denaturing bidimensional gel electrophoresis, followed by X-ray fluorescence visualization and identification by mass-spectrometry. A single spot containing the electron shuttle protein azurin was responsible for the observed increments in cuproprotein contents. In agreement, lack of either Cu(+)-ATPase induced an increase in azu transcription. This is associated with an increase in the expression of anr and rpoS oxidative stress response regulators, rather than cueR, a copper sensing regulator. We propose that azurin overexpression and accumulation in the periplasm is part of the cellular response to cytoplasmic oxidative stress in P. aeruginosa.
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Affiliation(s)
- Daniel Raimunda
- Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, MA 01605, USA
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Hinchliffe P, Symmons MF, Hughes C, Koronakis V. Structure and operation of bacterial tripartite pumps. Annu Rev Microbiol 2013; 67:221-42. [PMID: 23808339 DOI: 10.1146/annurev-micro-092412-155718] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In bacteria such as Pseudomonas aeruginosa and Escherichia coli, tripartite membrane machineries, or pumps, determine the efflux of small noxious molecules, such as detergents, heavy metals, and antibiotics, and the export of large proteins including toxins. They are therefore influential in bacterial survival, particularly during infections caused by multidrug-resistant pathogens. In these tripartite pumps an inner membrane transporter, typically an ATPase or proton antiporter, binds and translocates export or efflux substrates. In cooperation with a periplasmic adaptor protein it recruits and opens a TolC family cell exit duct, which is anchored in the outer membrane and projects across the periplasmic space between inner and outer membranes. Assembled tripartite pumps thus span the entire bacterial cell envelope. We review the atomic structures of each of the three pump components and discuss how these have allowed high-resolution views of tripartite pump assembly, operation, and possible inhibition.
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Affiliation(s)
- Philip Hinchliffe
- Department of Pathology, Cambridge University, Cambridge CB2 1QP, United Kingdom; , , ,
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Delmar JA, Su CC, Yu EW. Structural mechanisms of heavy-metal extrusion by the Cus efflux system. Biometals 2013; 26:593-607. [PMID: 23657864 DOI: 10.1007/s10534-013-9628-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 04/23/2013] [Indexed: 01/14/2023]
Abstract
Resistance-nodulation-cell division (RND) superfamily efflux systems are responsible for the active transport of toxic compounds from the Gram-negative bacterial cell. These pumps typically assemble as tripartite complexes, spanning the inner and outer membranes of the cell envelope. In Escherichia coli, the CusC(F)BA complex, which exports copper(I) and silver(I) and mediates resistance to these two metal ions, is the only known RND transporter with a specificity for heavy metals. We have determined the crystal structures of both the inner membrane pump CusA and membrane fusion protein CusB, as well as the adaptor-transporter CusBA complex formed by these two efflux proteins. In addition, the crystal structures of the outer membrane channel CusC and the periplasmic metallochaperone CusF have been resolved. Based on these structures, the entire assembled model of the tripartite efflux system has been developed, and this efflux complex should be in the form of CusC3-CusB6-CusA3. It has been shown that CusA utilizes methionine clusters to bind and export Cu(I) and Ag(I). This pump is likely to undergo a conformational change, and utilize a relay network of methionine clusters as well as conserved charged residues to extrude the metal ions from the bacterial cell.
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Affiliation(s)
- Jared A Delmar
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
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Influence of copper resistance determinants on gold transformation by Cupriavidus metallidurans strain CH34. J Bacteriol 2013; 195:2298-308. [PMID: 23475973 DOI: 10.1128/jb.01951-12] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Cupriavidus metallidurans is associated with gold grains and may be involved in their formation. Gold(III) complexes influence the transcriptome of C. metallidurans (F. Reith et al., Proc. Natl. Acad. Sci. U. S. A. 106:17757-17762, 2009), leading to the upregulation of genes involved in the detoxification of reactive oxygen species and metal ions. In a systematic study, the involvement of these systems in gold transformation was investigated. Treatment of C. metallidurans cells with Au(I) complexes, which occur in this organism's natural environment, led to the upregulation of genes similar to those observed for treatment with Au(III) complexes. The two indigenous plasmids of C. metallidurans, which harbor several transition metal resistance determinants, were not involved in resistance to Au(I/III) complexes nor in their transformation to metallic nanoparticles. Upregulation of a cupA-lacZ fusion by the MerR-type regulator CupR with increasing Au(III) concentrations indicated the presence of gold ions in the cytoplasm. A hypothesis stating that the Gig system detoxifies gold complexes by the uptake and reduction of Au(III) to Au(I) or Au(0) reminiscent to detoxification of Hg(II) was disproven. ZupT and other secondary uptake systems for transition metal cations influenced Au(III) resistance but not the upregulation of the cupA-lacZ fusion. The two copper-exporting P-type ATPases CupA and CopF were also not essential for gold resistance. The copABCD determinant on chromosome 2, which encodes periplasmic proteins involved in copper resistance, was required for full gold resistance in C. metallidurans. In conclusion, biomineralization of gold particles via the reduction of mobile Au(I/III) complexes in C. metallidurans appears to primarily occur in the periplasmic space via copper-handling systems.
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Abstract
As a trace element copper has an important role in cellular function like many other transition metals. Its ability to undergo redox changes [Cu(I) ↔ Cu(II)] makes copper an ideal cofactor in enzymes catalyzing electron transfers. However, this redox change makes copper dangerous for a cell since it is able to be involved in Fenton-like reactions creating reactive oxygen species (ROS). Cu(I) also is a strong soft metal and can attack and destroy iron-sulfur clusters thereby releasing iron which can in turn cause oxidative stress. Therefore, copper homeostasis has to be highly balanced to ensure proper cellular function while avoiding cell damage.Throughout evolution bacteria and archaea have developed a highly regulated balance in copper metabolism. While for many prokaryotes copper uptake seems to be unspecific, others have developed highly sophisticated uptake mechanisms to ensure the availability of sufficient amounts of copper. Within the cytoplasm copper is sequestered by various proteins and molecules, including specific copper chaperones, to prevent cellular damage. Copper-containing proteins are usually located in the cytoplasmic membrane with the catalytic domain facing the periplasm, in the periplasm of Gram-negative bacteria, or they are secreted, limiting the necessity of copper to accumulate in the cytoplasm. To prevent cellular damage due to excess copper, bacteria and archaea have developed various copper detoxification strategies. In this chapter we attempt to give an overview of the mechanisms employed by bacteria and archaea to handle copper and the importance of the metal for cellular function as well as in the global nutrient cycle.
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Affiliation(s)
- Christopher Rensing
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1870, Frederiksberg C, Denmark
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Nies DH, Herzberg M. A fresh view of the cell biology of copper in enterobacteria. Mol Microbiol 2012; 87:447-54. [PMID: 23217080 DOI: 10.1111/mmi.12123] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/04/2012] [Indexed: 11/27/2022]
Abstract
Copper ions are essential but also very toxic. Copper resistance in bacteria is based on export of the toxic ion, oxidation from Cu(I) to Cu(II), and sequestration by copper-binding metal chaperones, which deliver copper ions to efflux systems or metal-binding sites of copper-requiring proteins. In their publication in this issue, Osman et al. (2013) demonstrate how tightly copper resistance, homeostasis and delivery pathways are interwoven in Salmonella enterica sv. Typhimurium. Copper is transported from the cytoplasm by the two P-type ATPases CopA and GolT to the periplasm and transferred to SodCII by CueP, a periplasmic copper chaperone. When copper levels are higher, SodCII is also able to bind copper without the help of CueP. This scheme raises the question as to why copper ions present in the growth medium have to make the detour through the cytoplasm. The data presented in the publication by Osman et al. (2013) change our view of the cell biology of copper in enterobacteria.
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Affiliation(s)
- Dietrich H Nies
- Molecular Microbiology, Institute for Biology/Microbiology, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06120 Halle/Saale, Germany.
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Mirolo L, Schmidt T, Eckhardt S, Meuwly M, Fromm KM. pH-Dependent Coordination of AgIIons by Histidine: Experiment, Theory, and a Model for SilE. Chemistry 2012; 19:1754-61. [DOI: 10.1002/chem.201201844] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 10/29/2012] [Indexed: 12/28/2022]
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