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Vanvelk N, de Mesy Bentley KL, Verhofstad MHJ, Metsemakers WJ, Moriarty TF, Siverino C. Development of an ex vivo model to study Staphylococcus aureus invasion of the osteocyte lacuno-canalicular network. J Orthop Res 2024. [PMID: 39380444 DOI: 10.1002/jor.25988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2024] [Revised: 09/08/2024] [Accepted: 09/18/2024] [Indexed: 10/10/2024]
Abstract
Staphylococcus aureus has multiple mechanisms to evade the host's immune system and antibiotic treatment. One such mechanism is the invasion of the osteocyte lacuno-canalicular network (OLCN), which may be particularly important in recurrence of infection after debridement and antibiotic therapy. The aim of this study was to develop an ex vivo model to facilitate further study of S. aureus invasion of the OLCN and early-stage testing of antibacterial strategies against bacteria in this niche. The diameter of the canaliculi of non-infected human, sheep, and mouse bones was measured microscopically on Schmorl's picrothionin stained sections, showing a large overlap in canalicular diameter. S. aureus successfully invaded the OLCN in all species in vitro as revealed by presence in osteocyte lacunae in Brown and Brenn-stained sections and by scanning electron microscopy. Murine bones were then selected for further experiments, and titanium pins with either a wild-type or ΔPBP4 mutant S. aureus USA300 were placed trans-cortically and incubated for 2 weeks in tryptic soy broth. Wild-type S. aureus readily invaded the osteocyte lacunae in mouse bones while the ΔPBP4 showed a significantly lower invasion of the OLCN (p = 0.0005). Bone specimens were then treated with gentamicin, sitafloxacin, R14 bacteriophages, or left untreated. Gentamicin (p = 0.0027) and sitafloxacin (p = 0.0280) significantly reduced the proportion of S. aureus-occupied lacunae, whilst bacteriophage treatment had no effect. This study shows that S. aureus is able to invade the OLCN in an ex vivo model. This ex vivo model can be used for future early-stage studies before proceeding to in vivo studies.
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Affiliation(s)
- Niels Vanvelk
- AO Research Institute Davos, Davos, Switzerland
- Trauma Research Unit, Department of Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Karen L de Mesy Bentley
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
- Center for Advanced Research Technology (CART), University of Rochester Medical Center Rochester, Rochester, New York, USA
| | - Michael H J Verhofstad
- Trauma Research Unit, Department of Surgery, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Willem-Jan Metsemakers
- Department of Trauma Surgery, University Hospitals Leuven, Leuven, Belgium
- Department of Development and Regeneration, KU Leuven-University of Leuven, Leuven, Belgium
| | - Thomas F Moriarty
- AO Research Institute Davos, Davos, Switzerland
- Center for Muskuloskeletal Infections (ZMSI), University Hospital Basel, Basel, Switzerland
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2
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Liberini E, Fan SH, Bayer AS, Beck C, Biboy J, François P, Gray J, Hipp K, Koch I, Peschel A, Sailer B, Vollmer D, Vollmer W, Götz F. Staphylococcus aureus Stress Response to Bicarbonate Depletion. Int J Mol Sci 2024; 25:9251. [PMID: 39273203 PMCID: PMC11394868 DOI: 10.3390/ijms25179251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2024] [Revised: 08/16/2024] [Accepted: 08/19/2024] [Indexed: 09/15/2024] Open
Abstract
Bicarbonate and CO2 are essential substrates for carboxylation reactions in bacterial central metabolism. In Staphylococcus aureus, the bicarbonate transporter, MpsABC (membrane potential-generating system) is the only carbon concentrating system. An mpsABC deletion mutant can hardly grow in ambient air. In this study, we investigated the changes that occur in S. aureus when it suffers from CO2/bicarbonate deficiency. Electron microscopy revealed that ΔmpsABC has a twofold thicker cell wall thickness compared to the parent strain. The mutant was also substantially inert to cell lysis induced by lysostaphin and the non-ionic surfactant Triton X-100. Mass spectrometry analysis of muropeptides revealed the incorporation of alanine into the pentaglycine interpeptide bridge, which explains the mutant's lysostaphin resistance. Flow cytometry analysis of wall teichoic acid (WTA) glycosylation patterns revealed a significantly lower α-glycosylated and higher ß-glycosylated WTA, explaining the mutant's increased resistance towards Triton X-100. Comparative transcriptome analysis showed altered gene expression profiles. Autolysin-encoding genes such as sceD, a lytic transglycosylase encoding gene, were upregulated, like in vancomycin-intermediate S. aureus mutants (VISA). Genes related to cell wall-anchored proteins, secreted proteins, transporters, and toxins were downregulated. Overall, we demonstrate that bicarbonate deficiency is a stress response that causes changes in cell wall composition and global gene expression resulting in increased resilience to cell wall lytic enzymes and detergents.
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Affiliation(s)
- Elisa Liberini
- Microbial Genetics, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
| | - Sook-Ha Fan
- Microbial Genetics, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
- The Lundquist Institute, Torrance, CA 90502, USA
| | - Arnold S Bayer
- The Lundquist Institute, Torrance, CA 90502, USA
- David Geffen School of Medicine at UCLA-University of California, Los Angeles, CA 90095, USA
| | - Christian Beck
- Department of Infection Biology, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
| | - Jacob Biboy
- Biosciences Institute, Centre for Bacterial Cell Biology, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
| | - Patrice François
- Genomic Research Laboratory, Division of Infectious Diseases, Faculty of Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland
| | - Joe Gray
- Biosciences Institute, Centre for Bacterial Cell Biology, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
| | - Katharina Hipp
- Electron Microscopy Facility, Max-Planck-Institute for Biology, 72076 Tübingen, Germany
| | - Iris Koch
- Electron Microscopy Facility, Max-Planck-Institute for Biology, 72076 Tübingen, Germany
| | - Andreas Peschel
- Department of Infection Biology, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
- Excellence Cluster 2124 'Controlling Microbes to Fight Infections' (CMFI), University of Tübingen, 72076 Tübingen, Germany
| | - Brigitte Sailer
- Electron Microscopy Facility, Max-Planck-Institute for Biology, 72076 Tübingen, Germany
| | - Daniela Vollmer
- Biosciences Institute, Centre for Bacterial Cell Biology, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
| | - Waldemar Vollmer
- Biosciences Institute, Centre for Bacterial Cell Biology, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Friedrich Götz
- Microbial Genetics, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), University of Tübingen, 72076 Tübingen, Germany
- Excellence Cluster 2124 'Controlling Microbes to Fight Infections' (CMFI), University of Tübingen, 72076 Tübingen, Germany
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3
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Bollinger KW, Müh U, Ocius KL, Apostolos AJ, Pires MM, Helm RF, Popham DL, Weiss DS, Ellermeier CD. Identification of a family of peptidoglycan transpeptidases reveals that Clostridioides difficile requires noncanonical cross-links for viability. Proc Natl Acad Sci U S A 2024; 121:e2408540121. [PMID: 39150786 PMCID: PMC11348318 DOI: 10.1073/pnas.2408540121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Accepted: 07/12/2024] [Indexed: 08/18/2024] Open
Abstract
Most bacteria are surrounded by a cell wall that contains peptidoglycan (PG), a large polymer composed of glycan strands held together by short peptide cross-links. There are two major types of cross-links, termed 4-3 and 3-3 based on the amino acids involved. 4-3 cross-links are created by penicillin-binding proteins, while 3-3 cross-links are created by L,D-transpeptidases (LDTs). In most bacteria, the predominant mode of cross-linking is 4-3, and these cross-links are essential for viability, while 3-3 cross-links comprise only a minor fraction and are not essential. However, in the opportunistic intestinal pathogen Clostridioides difficile, about 70% of the cross-links are 3-3. We show here that 3-3 cross-links and LDTs are essential for viability in C. difficile. We also show that C. difficile has five LDTs, three with a YkuD catalytic domain as in all previously known LDTs and two with a VanW catalytic domain, whose function was until now unknown. The five LDTs exhibit extensive functional redundancy. VanW domain proteins are found in many gram-positive bacteria but scarce in other lineages. We tested seven non-C. difficile VanW domain proteins and confirmed LDT activity in three cases. In summary, our findings uncover a previously unrecognized family of PG cross-linking enzymes, assign a catalytic function to VanW domains, and demonstrate that 3-3 cross-linking is essential for viability in C. difficile, the first time this has been shown in any bacterial species. The essentiality of LDTs in C. difficile makes them potential targets for antibiotics that kill C. difficile selectively.
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Affiliation(s)
- Kevin W. Bollinger
- Department of Microbiology and Immunology, Carver College of Medicine, University of Iowa, Iowa City, IA52242
| | - Ute Müh
- Department of Microbiology and Immunology, Carver College of Medicine, University of Iowa, Iowa City, IA52242
| | - Karl L. Ocius
- Department of Chemistry, University of Virginia, Charlottesville, VA22904
| | | | - Marcos M. Pires
- Department of Chemistry, University of Virginia, Charlottesville, VA22904
| | - Richard F. Helm
- Department of Biochemistry, Virginia Tech, Blacksburg, VA24061
| | - David L. Popham
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA24061
| | - David S. Weiss
- Department of Microbiology and Immunology, Carver College of Medicine, University of Iowa, Iowa City, IA52242
- Graduate Program in Genetics, University of Iowa, Iowa City, IA52242
| | - Craig D. Ellermeier
- Department of Microbiology and Immunology, Carver College of Medicine, University of Iowa, Iowa City, IA52242
- Graduate Program in Genetics, University of Iowa, Iowa City, IA52242
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4
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Gardner TM, Grosser MR. A MRSA mystery: how PBP4 and cyclic-di-AMP join forces against β-lactam antibiotics. mBio 2024; 15:e0121024. [PMID: 39028200 PMCID: PMC11323572 DOI: 10.1128/mbio.01210-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024] Open
Abstract
The high-level resistance to next-generation β-lactams frequently found in Staphylococcus aureus isolates lacking mec, which encodes the transpeptidase PBP2a traditionally associated with methicillin-resistant Staphylococcus aureus (MRSA), has remained incompletely understood for decades. A new study by Lai et al. found that the co-occurrence of mutations in pbp4 and gdpP, which respectively cause increased PBP4-mediated cell wall crosslinking and elevated cyclic-di-AMP levels, produces synergistic β-lactam resistance rivaling that of PBP2a-producing MRSA (L.-Y. Lai, N. Satishkumar, S. Cardozo, V. Hemmadi, et al., mBio 15:e02889-23. 2024, https://doi.org/10.1128/mbio.02889-23). The combined mutations are sufficient to explain the high-level β-lactam resistance of some mec-lacking strains, but the mechanism of synergy remains elusive and an avenue for further research. Importantly, the authors establish that co-occurrence of these mutations leads to antibiotic therapy failure in a Caenorhabditis elegans infection model. These results underscore the need to consider this unique and novel β-lactam resistance mechanism during the clinical diagnosis of MRSA, rather than relying on mec as a diagnostic.
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Affiliation(s)
- Taylor M. Gardner
- Department of Biology, University of North Carolina Asheville, Asheville, North Carolina, USA
| | - Melinda R. Grosser
- Department of Biology, University of North Carolina Asheville, Asheville, North Carolina, USA
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5
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Sacco MD, Hammond LR, Noor RE, Bhattacharya D, McKnight LJ, Madsen JJ, Zhang X, Butler SG, Kemp MT, Jaskolka-Brown AC, Khan SJ, Gelis I, Eswara P, Chen Y. Staphylococcus aureus FtsZ and PBP4 bind to the conformationally dynamic N-terminal domain of GpsB. eLife 2024; 13:e85579. [PMID: 38639993 PMCID: PMC11062636 DOI: 10.7554/elife.85579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 04/15/2024] [Indexed: 04/20/2024] Open
Abstract
In the Firmicutes phylum, GpsB is a membrane associated protein that coordinates peptidoglycan synthesis with cell growth and division. Although GpsB has been studied in several bacteria, the structure, function, and interactome of Staphylococcus aureus GpsB is largely uncharacterized. To address this knowledge gap, we solved the crystal structure of the N-terminal domain of S. aureus GpsB, which adopts an atypical, asymmetric dimer, and demonstrates major conformational flexibility that can be mapped to a hinge region formed by a three-residue insertion exclusive to Staphylococci. When this three-residue insertion is excised, its thermal stability increases, and the mutant no longer produces a previously reported lethal phenotype when overexpressed in Bacillus subtilis. In S. aureus, we show that these hinge mutants are less functional and speculate that the conformational flexibility imparted by the hinge region may serve as a dynamic switch to fine-tune the function of the GpsB complex and/or to promote interaction with its various partners. Furthermore, we provide the first biochemical, biophysical, and crystallographic evidence that the N-terminal domain of GpsB binds not only PBP4, but also FtsZ, through a conserved recognition motif located on their C-termini, thus coupling peptidoglycan synthesis to cell division. Taken together, the unique structure of S. aureus GpsB and its direct interaction with FtsZ/PBP4 provide deeper insight into the central role of GpsB in S. aureus cell division.
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Affiliation(s)
- Michael D Sacco
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
| | - Lauren R Hammond
- Department of Molecular Biosciences, University of South FloridaTampaUnited States
| | - Radwan E Noor
- Department of Chemistry, University of South FloridaTampaUnited States
| | | | - Lily J McKnight
- Department of Molecular Biosciences, University of South FloridaTampaUnited States
| | - Jesper J Madsen
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
- Global and Planetary Health, College of Public Health, University of South FloridaTampaUnited States
| | - Xiujun Zhang
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
| | - Shane G Butler
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
| | - M Trent Kemp
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
| | - Aiden C Jaskolka-Brown
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
| | - Sebastian J Khan
- Department of Molecular Biosciences, University of South FloridaTampaUnited States
| | - Ioannis Gelis
- Department of Chemistry, University of South FloridaTampaUnited States
| | - Prahathees Eswara
- Department of Molecular Biosciences, University of South FloridaTampaUnited States
| | - Yu Chen
- Department of Molecular Medicine, Morsani College of Medicine, University of South FloridaTampaUnited States
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6
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Sharma P, Vaiwala R, Gopinath AK, Chockalingam R, Ayappa KG. Structure of the Bacterial Cell Envelope and Interactions with Antimicrobials: Insights from Molecular Dynamics Simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7791-7811. [PMID: 38451026 DOI: 10.1021/acs.langmuir.3c03474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Bacteria have evolved over 3 billion years, shaping our intrinsic and symbiotic coexistence with these single-celled organisms. With rising populations of drug-resistant strains, the search for novel antimicrobials is an ongoing area of research. Advances in high-performance computing platforms have led to a variety of molecular dynamics simulation strategies to study the interactions of antimicrobial molecules with different compartments of the bacterial cell envelope of both Gram-positive and Gram-negative species. In this review, we begin with a detailed description of the structural aspects of the bacterial cell envelope. Simulations concerned with the transport and associated free energy of small molecules and ions through the outer membrane, peptidoglycan, inner membrane and outer membrane porins are discussed. Since surfactants are widely used as antimicrobials, a section is devoted to the interactions of surfactants with the cell wall and inner membranes. The review ends with a discussion on antimicrobial peptides and the insights gained from the molecular simulations on the free energy of translocation. Challenges involved in developing accurate molecular models and coarse-grained strategies that provide a trade-off between atomic details with a gain in sampling time are highlighted. The need for efficient sampling strategies to obtain accurate free energies of translocation is also discussed. Molecular dynamics simulations have evolved as a powerful tool that can potentially be used to design and develop novel antimicrobials and strategies to effectively treat bacterial infections.
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Affiliation(s)
- Pradyumn Sharma
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India, 560012
| | - Rakesh Vaiwala
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India, 560012
| | - Amar Krishna Gopinath
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India, 560012
| | - Rajalakshmi Chockalingam
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India, 560012
| | - K Ganapathy Ayappa
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India, 560012
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7
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Baroi AM, Fierascu I, Ghizdareanu AI, Trica B, Fistos T, Matei (Brazdis) RI, Fierascu RC, Firinca C, Sardarescu ID, Avramescu SM. Green Approach for Synthesis of Silver Nanoparticles with Antimicrobial and Antioxidant Properties from Grapevine Waste Extracts. Int J Mol Sci 2024; 25:4212. [PMID: 38673798 PMCID: PMC11050308 DOI: 10.3390/ijms25084212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 04/04/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
The present work aims to study the possibilities of developing silver nanoparticles using natural extracts of grape pomace wastes originating from the native variety of Fetească Neagră 6 Șt. This study focused on investigating the influence of grape pomace extract obtained by two different extraction methods (classical temperature extraction and microwave-assisted extraction) in the phytosynthesis process of metal nanoparticles. The total phenolic content of the extracts was assessed using the spectrophotometric method with the Folin-Ciocâlteu reagent, while the identification and quantification of specific components were conducted through high-performance liquid chromatography with a diode array detector (HPLC-DAD). The obtained nanoparticles were characterized by UV-Vis absorption spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM), along with assessing their antioxidant and antimicrobial properties against Gram-positive bacteria. The data collected from the experiments indicated that the nanoparticles were formed in a relatively short period of time (96 h) and, for the experimental variant involving the use of a 1:1 ratio (v/v, grape pomace extract: silver nitrate) for the nanoparticle phytosynthesis, the smallest crystallite sizes (from X-ray diffraction-4.58 nm and 5.14 nm) as well as spherical or semispherical nanoparticles with the lowest average diameters were obtained (19.99-23 nm, from TEM analysis). The phytosynthesis process was shown to enhance the antioxidant properties (determined using the DPPH assay) and the antimicrobial potential (tested against Gram-positive strains) of the nanoparticles, as evidenced by comparing their properties with those of the parent extracts; at the same time, the nanoparticles exhibited a selectivity in action, being active against the Staphylococcus aureus strain while presenting no antimicrobial potential against the Enterococcus faecalis strain.
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Affiliation(s)
- Anda Maria Baroi
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Marasti Blvd., 011464 Bucharest, Romania
| | - Irina Fierascu
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Marasti Blvd., 011464 Bucharest, Romania
| | - Andra-Ionela Ghizdareanu
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
| | - Bogdan Trica
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
| | - Toma Fistos
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Str., 011061 Bucharest, Romania;
| | - Roxana Ioana Matei (Brazdis)
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Str., 011061 Bucharest, Romania;
| | - Radu Claudiu Fierascu
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Str., 011061 Bucharest, Romania;
| | - Cristina Firinca
- National Institute for Research & Development in Chemistry and Petrochemistry–ICECHIM, 202 Spl. Independentei, 060021 Bucharest, Romania; (A.M.B.); (A.-I.G.); (B.T.); (T.F.); (R.I.M.); (R.C.F.); (C.F.)
- Department of Botany and Microbiology, Faculty of Biology, University of Bucharest, 91–95 Spl. Independenței, 050095 Bucharest, Romania
| | - Ionela Daniela Sardarescu
- Faculty of Chemical Engineering and Biotechnology, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu Str., 011061 Bucharest, Romania;
- National Research and Development Institute for Biotechnology in Horticulture, Bucharet-Pitesti Str., 117715 Stefanesti, Romania
| | - Sorin Marius Avramescu
- Department of Inorganic Chemistry, Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 030018 Bucharest, Romania;
- Research Centre for Environmental Protection and Waste Management (PROTMED), University of Bucharest, 91–95 Spl. Independenței, Sect. 5, 050107 Bucharest, Romania
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8
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Pereira AJ, Xing H, de Campos LJ, Seleem MA, de Oliveira KMP, Obaro SK, Conda-Sheridan M. Structure-Activity Relationship Study to Develop Peptide Amphiphiles as Species-Specific Antimicrobials. Chemistry 2024; 30:e202303986. [PMID: 38221408 PMCID: PMC10939825 DOI: 10.1002/chem.202303986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/05/2024] [Accepted: 01/09/2024] [Indexed: 01/16/2024]
Abstract
Antimicrobial peptide amphiphiles (PAs) are a promising class of molecules that can disrupt the bacterial membrane or act as drug nanocarriers. In this study, we prepared 33 PAs to establish supramolecular structure-activity relationships. We studied the morphology and activity of the nanostructures against different Gram-positive and Gram-negative bacterial strains (such as Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Acinetobacter baumannii). Next, we used principal component analysis (PCA) to determine the key contributors to activity. We found that for S. aureus, the zeta potential was the major contributor to the activity while Gram-negative bacteria were more influenced by the partition coefficient (LogP) with the following order P. aeruginosa>E. coli>A. baumannii. We also performed a study of the mechanism of action of selected PAs on the bacterial membrane assessing the membrane permeability and depolarization, changes in zeta potential and overall integrity. We studied the toxicity of the nanostructures against mammalian cells. Finally, we performed an in vivo study using the wax moth larvae to determine the therapeutic efficacy of the active PAs. This study shows cationic PA nanostructures can be an intriguing platform for the development of nanoantibacterials.
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Affiliation(s)
- Aramis J. Pereira
- A. J. Pereira, Dr. H. Xing, L. J. de Campos, Prof. Dr. M. Conda-Sheridan, Department of Pharmaceutical Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE 68198 (USA)
| | - Huihua Xing
- A. J. Pereira, Dr. H. Xing, L. J. de Campos, Prof. Dr. M. Conda-Sheridan, Department of Pharmaceutical Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE 68198 (USA)
| | - Luana J. de Campos
- A. J. Pereira, Dr. H. Xing, L. J. de Campos, Prof. Dr. M. Conda-Sheridan, Department of Pharmaceutical Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE 68198 (USA)
| | - Mohamed A. Seleem
- Dr. M.A. Seleem, Department of Pharmaceutical Organic Chemistry, Al-Azhar University, Cairo, 4434003 (Egypt)
| | - Kelly M. P. de Oliveira
- Prof. Dr. K. M. P. de Oliveira, Department of Biological and Environmental Science, Federal University of Grande Dourados (UFGD), Dourados, MS 79804-970 (Brazil)
| | - Stephen K. Obaro
- Prof. Dr. S. K. Obaro, Division of Pediatric Infectious Diseases, University of Alabama at Birmingham (UAB), Birmingham, AL 35233 (USA), International Foundation against Infectious Diseases in Nigeria (IFAIN), Abuja, 900108 (Nigeria)
| | - Martin Conda-Sheridan
- A. J. Pereira, Dr. H. Xing, L. J. de Campos, Prof. Dr. M. Conda-Sheridan, Department of Pharmaceutical Sciences, University of Nebraska Medical Center (UNMC), Omaha, NE 68198 (USA)
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9
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Razew A, Laguri C, Vallet A, Bougault C, Kaus-Drobek M, Sabala I, Simorre JP. Staphylococcus aureus sacculus mediates activities of M23 hydrolases. Nat Commun 2023; 14:6706. [PMID: 37872144 PMCID: PMC10593780 DOI: 10.1038/s41467-023-42506-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 10/12/2023] [Indexed: 10/25/2023] Open
Abstract
Peptidoglycan, a gigadalton polymer, functions as the scaffold for bacterial cell walls and provides cell integrity. Peptidoglycan is remodelled by a large and diverse group of peptidoglycan hydrolases, which control bacterial cell growth and division. Over the years, many studies have focused on these enzymes, but knowledge on their action within peptidoglycan mesh from a molecular basis is scarce. Here, we provide structural insights into the interaction between short peptidoglycan fragments and the entire sacculus with two evolutionarily related peptidases of the M23 family, lysostaphin and LytM. Through nuclear magnetic resonance, mass spectrometry, information-driven modelling, site-directed mutagenesis and biochemical approaches, we propose a model in which peptidoglycan cross-linking affects the activity, selectivity and specificity of these two structurally related enzymes differently.
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Affiliation(s)
- Alicja Razew
- Universite Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, 71 avenue des Martyrs-CS10090, Grenoble cedex 9, 38044, France
- International Institute of Molecular and Cell Biology in Warsaw, 4 Ks. Trojdena Street, 02-109, Warsaw, Poland
- Laboratory of Protein Engineering, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego Street, 02-106, Warsaw, Poland
| | - Cedric Laguri
- Universite Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, 71 avenue des Martyrs-CS10090, Grenoble cedex 9, 38044, France
| | - Alicia Vallet
- Universite Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, 71 avenue des Martyrs-CS10090, Grenoble cedex 9, 38044, France
| | - Catherine Bougault
- Universite Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, 71 avenue des Martyrs-CS10090, Grenoble cedex 9, 38044, France
| | - Magdalena Kaus-Drobek
- Laboratory of Protein Engineering, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego Street, 02-106, Warsaw, Poland
| | - Izabela Sabala
- International Institute of Molecular and Cell Biology in Warsaw, 4 Ks. Trojdena Street, 02-109, Warsaw, Poland.
- Laboratory of Protein Engineering, Mossakowski Medical Research Institute, Polish Academy of Sciences, 5 Pawinskiego Street, 02-106, Warsaw, Poland.
| | - Jean-Pierre Simorre
- Universite Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, 71 avenue des Martyrs-CS10090, Grenoble cedex 9, 38044, France.
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10
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Satishkumar N, Lai LY, Mukkayyan N, Vogel BE, Chatterjee SS. A Nonclassical Mechanism of β-Lactam Resistance in Methicillin-Resistant Staphylococcus aureus and Its Effect on Virulence. Microbiol Spectr 2022; 10:e0228422. [PMID: 36314912 PMCID: PMC9769611 DOI: 10.1128/spectrum.02284-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 10/07/2022] [Indexed: 11/07/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a group of pathogenic bacteria that are infamously resistant to β-lactam antibiotics, a property attributed to the mecA gene. Recent studies have reported that mutations associated with the promoter region of pbp4 demonstrated high levels of β-lactam resistance, suggesting the role of PBP4 as an important non-mecA mediator of β-lactam resistance. The pbp4-promoter-associated mutations have been detected in strains with or without mecA. Our previous studies that were carried out in strains devoid of mecA described that pbp4-promoter-associated mutations lead to PBP4 overexpression and β-lactam resistance. In this study, by introducing various pbp4-promoter-associated mutations in the genome of a MRSA strain, we demonstrate that PBP4 overexpression can supplement mecA-associated resistance in S. aureus and can lead to increased β-lactam resistance. The promoter and regulatory region of pbp4 is shared with a divergently transcribed gene, abcA, which encodes a multidrug exporter. We demonstrate that the promoter mutations caused an upregulation of pbp4 and downregulation of abcA, confirming that the resistant phenotype is associated with PBP4 overexpression. PBP4 has also been associated with staphylococcal pathogenesis, however, its exact role remains unclear. Using a Caenorhabditis elegans model, we demonstrate that strains having increased PBP4 expression are less virulent than wild-type strains, suggesting that β-lactam resistance mediated via PBP4 likely comes at the cost of virulence. IMPORTANCE Our study demonstrates the ability of PBP4 to be an important mediator of β-lactam resistance in not only methicillin-susceptible Staphylococcus aureus (MSSA) background strains as previously demonstrated but also in MRSA strains. When present together, PBP2a and PBP4 overexpression can produce increased levels of β-lactam resistance, causing complications in treatment. Thus, this study suggests the importance of monitoring PBP4-associated resistance in clinical settings, as well as understanding the mechanistic basis of associated resistance, so that treatments targeting PBP4 may be developed. This study also demonstrates that S. aureus strains with increased PBP4 expression are less pathogenic, providing important hints about the role of PBP4 in S. aureus resistance and pathogenesis.
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Affiliation(s)
- Nidhi Satishkumar
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, Maryland, USA
- Institute of Marine and Environmental Technology (IMET), Baltimore, Maryland, USA
| | - Li-Yin Lai
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, Maryland, USA
- Institute of Marine and Environmental Technology (IMET), Baltimore, Maryland, USA
| | - Nagaraja Mukkayyan
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, Maryland, USA
- Institute of Marine and Environmental Technology (IMET), Baltimore, Maryland, USA
| | - Bruce E. Vogel
- Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, University of Maryland, Baltimore, Maryland, USA
| | - Som S. Chatterjee
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, Maryland, USA
- Institute of Marine and Environmental Technology (IMET), Baltimore, Maryland, USA
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11
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Differentiating interactions of antimicrobials with Gram-negative and Gram-positive bacterial cell walls using molecular dynamics simulations. Biointerphases 2022; 17:061008. [PMID: 36511523 DOI: 10.1116/6.0002087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Developing molecular models to capture the complex physicochemical architecture of the bacterial cell wall and to study the interaction with antibacterial molecules is an important aspect of assessing and developing novel antimicrobial molecules. We carried out molecular dynamics simulations using an atomistic model of peptidoglycan to represent the architecture for Gram-positive S. aureus. The model is developed to capture various structural features of the Staphylococcal cell wall, such as the peptide orientation, area per disaccharide, glycan length distribution, cross-linking, and pore size. A comparison of the cell wall density and electrostatic potentials is made with a previously developed cell wall model of Gram-negative bacteria, E. coli, and properties for both single and multilayered structures of the Staphylococcal cell wall are studied. We investigated the interactions of the antimicrobial peptide melittin with peptidoglycan structures. The depth of melittin binding to peptidoglycan is more pronounced in E. coli than in S. aureus, and consequently, melittin has greater contacts with glycan units of E. coli. Contacts of melittin with the amino acids of peptidoglycan are comparable across both the strains, and the D-Ala residues, which are sites for transpeptidation, show enhanced interactions with melittin. A low energetic barrier is observed for translocation of a naturally occurring antimicrobial thymol with the four-layered peptidoglycan model. The molecular model developed for Gram-positive peptidoglycan allows us to compare and contrast the cell wall penetrating properties with Gram-negative strains and assess for the first time binding and translocation of antimicrobial molecules for Gram-positive cell walls.
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12
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Apostolos AJ, Kelly JJ, Ongwae GM, Pires MM. Structure Activity Relationship of the Stem Peptide in Sortase A Mediated Ligation from Staphylococcus aureus. Chembiochem 2022; 23:e202200412. [PMID: 36018606 PMCID: PMC9632411 DOI: 10.1002/cbic.202200412] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/24/2022] [Indexed: 01/11/2023]
Abstract
The surfaces of most Gram-positive bacterial cells, including that of Staphylococcus aureus (S. aureus), are heavily decorated with proteins that coordinate cellular interactions with the extracellular space. In S. aureus, sortase A is the principal enzyme responsible for covalently anchoring proteins, which display the sorting signal LPXTG, onto the peptidoglycan (PG) matrix. Considerable efforts have been made to understand the role of this signal peptide in the sortase-mediated reaction. In contrast, much less is known about how the primary structure of the other substrate involved in the reaction (PG stem peptide) could impact sortase activity. To assess the sortase activity, a library of synthetic analogs of the stem peptide that mimic naturally existing variations found in the S. aureus PG primary sequence were evaluated. Using a combination of two unique assays, we showed that there is broad tolerability of substrate variations that are effectively processed by sortase A. While some of these stem peptide derivatives are naturally found in mature PG, they are not known to be present in the PG precursor, lipid II. These results suggest that sortase A could process both lipid II and mature PG as acyl-acceptor strands that might reside near the membrane, which has not been previously described.
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Affiliation(s)
| | - Joey J. Kelly
- Department of ChemistryUniversity of VirginiaCharlottesville, VA22904USA
| | - George M. Ongwae
- Department of ChemistryUniversity of VirginiaCharlottesville, VA22904USA
| | - Marcos M. Pires
- Department of ChemistryUniversity of VirginiaCharlottesville, VA22904USA
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13
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Wang M, Buist G, van Dijl JM. Staphylococcus aureus cell wall maintenance - the multifaceted roles of peptidoglycan hydrolases in bacterial growth, fitness, and virulence. FEMS Microbiol Rev 2022; 46:6604383. [PMID: 35675307 PMCID: PMC9616470 DOI: 10.1093/femsre/fuac025] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 04/22/2022] [Accepted: 05/25/2022] [Indexed: 01/07/2023] Open
Abstract
Staphylococcus aureus is an important human and livestock pathogen that is well-protected against environmental insults by a thick cell wall. Accordingly, the wall is a major target of present-day antimicrobial therapy. Unfortunately, S. aureus has mastered the art of antimicrobial resistance, as underscored by the global spread of methicillin-resistant S. aureus (MRSA). The major cell wall component is peptidoglycan. Importantly, the peptidoglycan network is not only vital for cell wall function, but it also represents a bacterial Achilles' heel. In particular, this network is continuously opened by no less than 18 different peptidoglycan hydrolases (PGHs) encoded by the S. aureus core genome, which facilitate bacterial growth and division. This focuses attention on the specific functions executed by these enzymes, their subcellular localization, their control at the transcriptional and post-transcriptional levels, their contributions to staphylococcal virulence and their overall importance in bacterial homeostasis. As highlighted in the present review, our understanding of the different aspects of PGH function in S. aureus has been substantially increased over recent years. This is important because it opens up new possibilities to exploit PGHs as innovative targets for next-generation antimicrobials, passive or active immunization strategies, or even to engineer them into effective antimicrobial agents.
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Affiliation(s)
- Min Wang
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, PO Box 30001, 9700 RB Groningen, the Netherlands
| | | | - Jan Maarten van Dijl
- Corresponding author: Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, P.O. box 30001, HPC EB80, 9700 RB Groningen, the Netherlands, Tel. +31-50-3615187; Fax. +31-50-3619105; E-mail:
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14
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Pandur Ž, Dular M, Kostanjšek R, Stopar D. Bacterial cell wall material properties determine E. coli resistance to sonolysis. ULTRASONICS SONOCHEMISTRY 2022; 83:105919. [PMID: 35077964 PMCID: PMC8789596 DOI: 10.1016/j.ultsonch.2022.105919] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 12/23/2021] [Accepted: 01/13/2022] [Indexed: 05/02/2023]
Abstract
The applications of bacterial sonolysis in industrial settings are plagued by the lack of the knowledge of the exact mechanism of action of sonication on bacterial cells, variable effectiveness of cavitation on bacteria, and inconsistent data of its efficiency. In this study we have systematically changed material properties of E. coli cells to probe the effect of different cell wall layers on bacterial resistance to ultrasonic irradiation (20 kHz, output power 6,73 W, horn type, 3 mm probe tip diameter, 1 ml sample volume). We have determined the rates of sonolysis decay for bacteria with compromised major capsular polymers, disrupted outer membrane, compromised peptidoglycan layer, spheroplasts, giant spheroplasts, and in bacteria with different cell physiology. The non-growing bacteria were 5-fold more resistant to sonolysis than growing bacteria. The most important bacterial cell wall structure that determined the outcome during sonication was peptidoglycan. If peptidoglycan was remodelled, weakened, or absent the cavitation was very efficient. Cells with removed peptidoglycan had sonolysis resistance equal to lipid vesicles and were extremely sensitive to sonolysis. The results suggest that bacterial physiological state as well as cell wall architecture are major determinants that influence the outcome of bacterial sonolysis.
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Affiliation(s)
- Žiga Pandur
- University of Ljubljana, Biotechnical Faculty, Večna pot 111, 1000 Ljubljana, SI-Slovenia; University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, 1000 Ljubljana, SI-Slovenia
| | - Matevž Dular
- University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, 1000 Ljubljana, SI-Slovenia
| | - Rok Kostanjšek
- University of Ljubljana, Biotechnical Faculty, Večna pot 111, 1000 Ljubljana, SI-Slovenia
| | - David Stopar
- University of Ljubljana, Biotechnical Faculty, Večna pot 111, 1000 Ljubljana, SI-Slovenia.
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15
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Staphylococcus aureus cell wall structure and dynamics during host-pathogen interaction. PLoS Pathog 2021; 17:e1009468. [PMID: 33788901 PMCID: PMC8041196 DOI: 10.1371/journal.ppat.1009468] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 04/12/2021] [Accepted: 03/12/2021] [Indexed: 01/09/2023] Open
Abstract
Peptidoglycan is the major structural component of the Staphylococcus aureus cell wall, in which it maintains cellular integrity, is the interface with the host, and its synthesis is targeted by some of the most crucial antibiotics developed. Despite this importance, and the wealth of data from in vitro studies, we do not understand the structure and dynamics of peptidoglycan during infection. In this study we have developed methods to harvest bacteria from an active infection in order to purify cell walls for biochemical analysis ex vivo. Isolated ex vivo bacterial cells are smaller than those actively growing in vitro, with thickened cell walls and reduced peptidoglycan crosslinking, similar to that of stationary phase cells. These features suggested a role for specific peptidoglycan homeostatic mechanisms in disease. As S. aureus missing penicillin binding protein 4 (PBP4) has reduced peptidoglycan crosslinking in vitro its role during infection was established. Loss of PBP4 resulted in an increased recovery of S. aureus from the livers of infected mice, which coincided with enhanced fitness within murine and human macrophages. Thicker cell walls correlate with reduced activity of peptidoglycan hydrolases. S. aureus has a family of 4 putative glucosaminidases, that are collectively crucial for growth. Loss of the major enzyme SagB, led to attenuation during murine infection and reduced survival in human macrophages. However, loss of the other three enzymes Atl, SagA and ScaH resulted in clustering dependent attenuation, in a zebrafish embryo, but not a murine, model of infection. A combination of pbp4 and sagB deficiencies resulted in a restoration of parental virulence. Our results, demonstrate the importance of appropriate cell wall structure and dynamics during pathogenesis, providing new insight to the mechanisms of disease. The prevalence of methicillin resistant Staphylococcus aureus (MRSA) in both hospitals and the wider community places a huge weight on healthcare providers. To discover new control regimes, it is therefore important to understand how the pathogen behaves within the relevant environment of the host. This is often hampered by the ability to obtain sufficient ex vivo pathogen samples for study. We have developed a method to isolate S. aureus from the infected host to be able to analyse cellular morphology and structure. S. aureus, isolated from an infected kidney abscess are smaller in size, with thicker cell walls than exponentially growing cells in vitro. Their cell wall peptidoglycan also is less crosslinked. These features suggested the role of components controlling cell wall homeostasis as being important for infections. We tested the role of PBP4, known to increase cell wall crosslinking and found a pbp4 mutant to have increased survival in macrophages and fitness within the murine host. Conversely the peptidoglycan hydrolase SagB, whose loss results in thinner cell walls was attenuated in the murine systemic model of infection, with concomitant loss of fitness within macrophages. Our study reveals an important adaptation to the host environment and the role of those components involved in cell wall homeostasis in vivo.
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16
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Masters EA, de Mesy Bentley KL, Gill AL, Hao SP, Galloway CA, Salminen AT, Guy DR, McGrath JL, Awad HA, Gill SR, Schwarz EM. Identification of Penicillin Binding Protein 4 (PBP4) as a critical factor for Staphylococcus aureus bone invasion during osteomyelitis in mice. PLoS Pathog 2020; 16:e1008988. [PMID: 33091079 PMCID: PMC7608983 DOI: 10.1371/journal.ppat.1008988] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 11/03/2020] [Accepted: 09/17/2020] [Indexed: 12/03/2022] Open
Abstract
Staphylococcus aureus infection of bone is challenging to treat because it colonizes the osteocyte lacuno-canalicular network (OLCN) of cortical bone. To elucidate factors involved in OLCN invasion and identify novel drug targets, we completed a hypothesis-driven screen of 24 S. aureus transposon insertion mutant strains for their ability to propagate through 0.5 μm-sized pores in the Microfluidic Silicon Membrane Canalicular Arrays (μSiM-CA), developed to model S. aureus invasion of the OLCN. This screen identified the uncanonical S. aureus transpeptidase, penicillin binding protein 4 (PBP4), as a necessary gene for S. aureus deformation and propagation through nanopores. In vivo studies revealed that Δpbp4 infected tibiae treated with vancomycin showed a significant 12-fold reduction in bacterial load compared to WT infected tibiae treated with vancomycin (p<0.05). Additionally, Δpbp4 infected tibiae displayed a remarkable decrease in pathogenic bone-loss at the implant site with and without vancomycin therapy. Most importantly, Δpbp4 S. aureus failed to invade and colonize the OLCN despite high bacterial loads on the implant and in adjacent tissues. Together, these results demonstrate that PBP4 is required for S. aureus colonization of the OLCN and suggest that inhibitors may be synergistic with standard of care antibiotics ineffective against bacteria within the OLCN. Staphylococcus aureus is the most prevalent pathogen in osteomyelitis, and its infection of bone is difficult to cure. S. aureus colonization of the osteocyte lacuno-canalicular network (OLCN) of cortical bone has been identified as a novel pathogenetic mechanism in chronic osteomyelitis. To elucidate factors involved in OLCN invasion, we conducted an in vitro genetic screen that identified pbp4 as a critical gene for S. aureus cell deformation and propagation through nanopores and demonstrated that PBP4 is critical for OLCN colonization in murine osteomyelitis. Thus, PBP4 inhibitors may be novel drugs to treat osteomyelitis in combination with standard of care antibiotics.
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Affiliation(s)
- Elysia A. Masters
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Karen L. de Mesy Bentley
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Orthopaedics, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Ann Lindley Gill
- Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Stephanie P. Hao
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Chad A. Galloway
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Alec T. Salminen
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Diamond R. Guy
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
| | - James L. McGrath
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Hani A. Awad
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Steven R. Gill
- Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Edward M. Schwarz
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Biomedical Engineering, University of Rochester Medical Center, Rochester, NY, United States of America
- Department of Orthopaedics, University of Rochester Medical Center, Rochester, NY, United States of America
- * E-mail:
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17
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Banner DJ, Firlar E, Jakubonis J, Baggia Y, Osborn JK, Shahbazian-Yassar R, Megaridis CM, Shokuhfar T. Correlative ex situ and Liquid-Cell TEM Observation of Bacterial Cell Membrane Damage Induced by Rough Surface Topology. Int J Nanomedicine 2020; 15:1929-1938. [PMID: 32256069 PMCID: PMC7093104 DOI: 10.2147/ijn.s232230] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 01/27/2020] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Nanoscale surface roughness has been suggested to have antibacterial and antifouling properties. Several existing models have attempted to explain the antibacterial mechanism of nanoscale rough surfaces without direct observation. Here, conventional and liquid-cell TEM are implemented to observe nanoscale bacteria/surface roughness interaction. The visualization of such interactions enables the inference of possible antibacterial mechanisms. METHODS AND RESULTS Nanotextures are synthesized on biocompatible polymer microparticles (MPs) via plasma etching. Both conventional and liquid-phase transmission electron microscopy observations suggest that these MPs may cause cell lysis via bacterial binding to a single protrusion of the nanotexture. The bacterium/protrusion interaction locally compromises the cell wall, thus causing bacterial death. This study suggests that local mechanical damage and leakage of the cytosol kill the bacteria first, with subsequent degradation of the cell envelope. CONCLUSION Nanoscale surface roughness may act via a penetrative bactericidal mechanism. This insight suggests that future research may focus on optimizing bacterial binding to individual nanoscale projections in addition to stretching bacteria between nanopillars. Further, antibacterial nanotextures may find use in novel applications employing particles in addition to nanotextures on fibers or films.
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Affiliation(s)
- David J Banner
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Emre Firlar
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL60607, USA
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Justas Jakubonis
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Yusuf Baggia
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Jodi K Osborn
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Reza Shahbazian-Yassar
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Constantine M Megaridis
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
| | - Tolou Shokuhfar
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL60607, USA
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL60607, USA
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18
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Abstract
Dating back to the 1960s, initial studies on the staphylococcal cell wall were driven by the need to clarify the mode of action of the first antibiotics and the resistance mechanisms developed by the bacteria. During the following decades, the elucidation of the biosynthetic path and primary composition of staphylococcal cell walls was propelled by advances in microbial cell biology, specifically, the introduction of high-resolution analytical techniques and molecular genetic approaches. The field of staphylococcal cell wall gradually gained its own significance as the complexity of its chemical structure and involvement in numerous cellular processes became evident, namely its versatile role in host interactions, coordination of cell division and environmental stress signaling.This chapter includes an updated description of the anatomy of staphylococcal cell walls, paying particular attention to information from the last decade, under four headings: high-resolution analysis of the Staphylococcus aureus peptidoglycan; variations in peptidoglycan composition; genetic determinants and enzymes in cell wall synthesis; and complex functions of cell walls. The latest contributions to a more precise picture of the staphylococcal cell envelope were possible due to recently developed state-of-the-art microscopy and spectroscopy techniques and to a wide combination of -omics approaches, that are allowing to obtain a more integrative view of this highly dynamic structure.
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Affiliation(s)
- Rita Sobral
- UCIBIO-REQUIMTE, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
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19
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Ślusarz R, Samaszko-Fiertek J, Dmochowska B, Madaj J. Molecular dynamics study on the influence of C-terminal sugar substitution on dynamics and conformation of vancomycin derivatives. J Carbohydr Chem 2017. [DOI: 10.1080/07328303.2017.1347669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Rafał Ślusarz
- Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland
| | | | | | - Janusz Madaj
- Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland
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20
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Hildebrandt P, Surmann K, Salazar MG, Normann N, Völker U, Schmidt F. Alternative fluorescent labeling strategies for characterizing gram-positive pathogenic bacteria: Flow cytometry supported counting, sorting, and proteome analysis of Staphylococcus aureus retrieved from infected host cells. Cytometry A 2016; 89:932-940. [PMID: 27643682 DOI: 10.1002/cyto.a.22981] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 07/01/2016] [Accepted: 08/30/2016] [Indexed: 01/10/2023]
Abstract
Staphylococcus aureus is a Gram-positive opportunistic pathogen that is able to cause a broad range of infectious diseases in humans. Furthermore, S. aureus is able to survive inside nonprofessional phagocytic host cell which serve as a niche for the pathogen to hide from the immune system and antibiotics therapies. Modern OMICs technologies provide valuable tools to investigate host-pathogen interactions upon internalization. However, these experiments are often hampered by limited capabilities to retrieve bacteria from such an experimental setting. Thus, the aim of this study was to develop a labeling strategy allowing fast detection and quantitation of S. aureus in cell lysates or infected cell lines by flow cytometry for subsequent proteome analyses. Therefore, S. aureus cells were labeled with the DNA stain SYTO® 9, or Vancomycin BODIPY® FL (VMB), a glycopeptide antibiotic binding to most Gram-positive bacteria which was conjugated to a fluorescent dye. Staining of S. aureus HG001 with SYTO 9 allowed counting of bacteria from pure cultures but not in cell lysates from infection experiments. In contrast, with VMB it was feasible to stain bacteria from pure cultures as well as from samples of infection experiments. VMB can also be applied for histocytochemistry analysis of formaldehyde fixed cell layers grown on coverslips. Proteome analyses of S. aureus labeled with VMB revealed that the labeling procedure provoked only minor changes on proteome level and allowed cell sorting and analysis of S. aureus from infection settings with sensitivity similar to continuous gfp expression. Furthermore, VMB labeling allowed precise counting of internalized bacteria and can be employed for downstream analyses, e.g., proteomics, of strains not easily amendable to genetic manipulation such as clinical isolates. © 2016 International Society for Advancement of Cytometry.
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Affiliation(s)
- Petra Hildebrandt
- Department Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany.,ZIK-FunGene University Medicine Greifswald, Department Functional Genomics, Greifswald, Germany
| | - Kristin Surmann
- Department Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany.,ZIK-FunGene University Medicine Greifswald, Department Functional Genomics, Greifswald, Germany
| | - Manuela Gesell Salazar
- Department Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany
| | - Nicole Normann
- Department Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany.,ZIK-FunGene University Medicine Greifswald, Department Functional Genomics, Greifswald, Germany
| | - Uwe Völker
- Department Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany.,ZIK-FunGene University Medicine Greifswald, Department Functional Genomics, Greifswald, Germany
| | - Frank Schmidt
- Department Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany. .,ZIK-FunGene University Medicine Greifswald, Department Functional Genomics, Greifswald, Germany.
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β-Lactam resistance in methicillin-resistant Staphylococcus aureus USA300 is increased by inactivation of the ClpXP protease. Antimicrob Agents Chemother 2014; 58:4593-603. [PMID: 24867990 DOI: 10.1128/aac.02802-14] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) has acquired the mecA gene encoding a peptidoglycan transpeptidase, penicillin binding protein 2a (PBP2a), which has decreased affinity for β-lactams. Quickly spreading and highly virulent community-acquired (CA) MRSA strains recently emerged as a frequent cause of infection in individuals without exposure to the health care system. In this study, we found that the inactivation of the components of the ClpXP protease substantially increased the β-lactam resistance level of a CA-MRSA USA300 strain, suggesting that the proteolytic activity of ClpXP controls one or more pathways modulating β-lactam resistance. These pathways do not involve the control of mecA expression, as the cellular levels of PBP2a were unaltered in the clp mutants. An analysis of the cell envelope properties of the clpX and clpP mutants revealed a number of distinct phenotypes that may contribute to the enhanced β-lactam tolerance. Both mutants displayed significantly thicker cell walls, increased peptidoglycan cross-linking, and altered composition of monomeric muropeptide species compared to those of the wild types. Moreover, changes in Sle1-mediated peptidoglycan hydrolysis and altered processing of the major autolysin Atl were observed in the clp mutants. In conclusion, the results presented here point to an important role for the ClpXP protease in controlling cell wall metabolism and add novel insights into the molecular factors that determine strain-dependent β-lactam resistance.
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Ślusarz R, Szulc M, Madaj J. Molecular modeling of Gram-positive bacteria peptidoglycan layer, selected glycopeptide antibiotics and vancomycin derivatives modified with sugar moieties. Carbohydr Res 2014; 389:154-64. [DOI: 10.1016/j.carres.2014.02.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 01/31/2014] [Accepted: 02/02/2014] [Indexed: 10/25/2022]
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Turner RD, Vollmer W, Foster SJ. Different walls for rods and balls: the diversity of peptidoglycan. Mol Microbiol 2014; 91:862-74. [PMID: 24405365 PMCID: PMC4015370 DOI: 10.1111/mmi.12513] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/08/2014] [Indexed: 01/22/2023]
Abstract
Peptidoglycan performs the essential role of resisting turgor in the cell walls of most bacteria. It determines cell shape, and its biosynthesis is the target for many important antibiotics. The fundamental chemical building blocks of peptidoglycan are conserved: repeating disaccharides cross-linked by peptides. However, these blocks come in many varieties and can be assembled in different ways. So beyond the fundamental similarity, prodigious chemical, organizational and architectural diversity is revealed. Here, we track the evolution of our current understanding of peptidoglycan and underpinning technical and methodological developments. The origin and function of chemical diversity is discussed with respect to some well-studied example species. We then explore how this chemistry is manifested in elegant and complex peptidoglycan organization and how this is interpreted in different and sometimes controversial architectural models. We contend that emerging technology brings about the possibility of achieving a complete understanding of peptidoglycan chemistry, through architecture, to the way in which diverse species and populations of cells meet the challenges of maintaining viability and growth within their environmental niches, by exploiting the bioengineering versatility of peptidoglycan.
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Affiliation(s)
- Robert D Turner
- The Krebs Institute, Department of Molecular Biology and Biotechnology, Firth Court, Western Bank, The University of Sheffield, Sheffield, S10 2TN, UK
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Desmarais SM, De Pedro MA, Cava F, Huang KC. Peptidoglycan at its peaks: how chromatographic analyses can reveal bacterial cell wall structure and assembly. Mol Microbiol 2013; 89:1-13. [PMID: 23679048 DOI: 10.1111/mmi.12266] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/15/2013] [Indexed: 02/02/2023]
Abstract
The peptidoglycan (PG) cell wall is a unique macromolecule responsible for both shape determination and cellular integrity under osmotic stress in virtually all bacteria. A quantitative understanding of the relationships between PG architecture, morphogenesis, immune system activation and pathogenesis can provide molecular-scale insights into the function of proteins involved in cell wall synthesis and cell growth. High-performance liquid chromatography (HPLC) has played an important role in our understanding of the structural and chemical complexity of the cell wall by providing an analytical method to quantify differences in chemical composition. Here, we present a primer on the basic chemical features of wall structure that can be revealed through HPLC, along with a description of the applications of HPLC PG analyses for interpreting the effects of genetic and chemical perturbations to a variety of bacterial species in different environments. We describe the physical consequences of different PG compositions on cell shape, and review complementary experimental and computational methodologies for PG analysis. Finally, we present a partial list of future targets of development for HPLC and related techniques.
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25
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Kim SJ, Singh M, Preobrazhenskaya M, Schaefer J. Staphylococcus aureus peptidoglycan stem packing by rotational-echo double resonance NMR spectroscopy. Biochemistry 2013; 52:3651-9. [PMID: 23617832 PMCID: PMC3796188 DOI: 10.1021/bi4005039] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Staphylococcus aureus grown in the presence of an alanine-racemase inhibitor was labeled with d-[1-(13)C]alanine and l-[(15)N]alanine to characterize some details of the peptidoglycan tertiary structure. Rotational-echo double-resonance NMR of intact whole cells was used to measure internuclear distances between (13)C and (15)N of labeled amino acids incorporated in the peptidoglycan, and from those labels to (19)F of a glycopeptide drug specifically bound to the peptidoglycan. The observed (13)C-(15)N average distance of 4.1-4.4 Å between d- and l-alanines in nearest-neighbor peptide stems is consistent with a local, tightly packed, parallel-stem architecture for a repeating structural motif within the peptidoglycan of S. aureus.
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Affiliation(s)
- Sung Joon Kim
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76706
| | - Manmilan Singh
- Department of Chemistry, Washington University, St. Louis, MO 63130
| | - Maria Preobrazhenskaya
- Gause Institute of New Antibiotics, Russian Academy of Medical Sciences, Moscow 119021, Russia
| | - Jacob Schaefer
- Department of Chemistry, Washington University, St. Louis, MO 63130
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26
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CHEN SHIANGLIANG, WENG YIHMING, HUANG JANJENG, LIN KOUJOONG. PHYSICOCHEMICAL CHARACTERISTICS AND BACTERIOSTATIC ABILITY OF MODIFIED LYSOZYME FROM LACTIC ACID-INDUCED GELLED EGG WHITE POWDER. J FOOD PROCESS PRES 2011. [DOI: 10.1111/j.1745-4549.2011.00584.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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In vivo synergism of ceftobiprole and vancomycin against experimental endocarditis due to vancomycin-intermediate Staphylococcus aureus. Antimicrob Agents Chemother 2011; 55:3977-84. [PMID: 21730114 DOI: 10.1128/aac.00402-11] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The efficacy of ceftobiprole combined with vancomycin was tested against two vancomycin-intermediate Staphylococcus aureus (VISA) strains, PC3 and Mu50, in rats with experimental endocarditis. Animals with infected aortic vegetations were treated for 3 days with doses simulating the kinetics after intravenous administration in humans of (i) the standard dose of ceftobiprole of 500 mg every 12 h (b.i.d.) (SD-ceftobiprole), (ii) a low dose of ceftobiprole of 250 mg b.i.d. (LD-ceftobiprole), (iii) a very low dose of ceftobiprole of 125 mg b.i.d. (VLD-ceftobiprole), (iv) SD-vancomycin of 1 g b.i.d., or (v) LD- or VLD-ceftobiprole combined with SD-vancomycin. Low dosages of ceftobiprole were purposely used to highlight positive drug interactions. Treatment with SD-ceftobiprole sterilized 12 of 14 (86%) and 10 of 13 (77%) vegetations infected with PC3 and Mu50, respectively (P < 0.001 versus controls). In comparison, LD-ceftobiprole sterilized 10 of 11 (91%) vegetations infected with PC3 (P < 0.01 versus controls) but only 3 of 12 (25%) vegetations infected with Mu50 (P > 0.05 versus controls). VLD-ceftobiprole and SD-vancomycin alone were ineffective against both strains (≤8% sterile vegetations). In contrast, the combination of VLD-ceftobiprole and SD-vancomycin sterilized 7 of 9 (78%) and 6 of 14 (43%) vegetations infected with PC3 and Mu50, respectively, and the combination of LD-ceftobiprole and SD-vancomycin sterilized 5 of 6 (83%) vegetations infected with Mu50 (P < 0.05 versus controls and monotherapy). Thus, ceftobiprole monotherapy simulating standard therapeutic doses was active against VISA experimental endocarditis. Moreover, subtherapeutic LD- and VLD-ceftobiprole synergized with ineffective vancomycin to restore efficacy. Hence, combining ceftobiprole with vancomycin broadens the therapeutic margin of these two compounds against VISA infections.
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Kern T, Giffard M, Hediger S, Amoroso A, Giustini C, Bui NK, Joris B, Bougault C, Vollmer W, Simorre JP. Dynamics Characterization of Fully Hydrated Bacterial Cell Walls by Solid-State NMR: Evidence for Cooperative Binding of Metal Ions. J Am Chem Soc 2010; 132:10911-9. [DOI: 10.1021/ja104533w] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Thomas Kern
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Mathilde Giffard
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Sabine Hediger
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Ana Amoroso
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Cécile Giustini
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Nhat Khai Bui
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Bernard Joris
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Catherine Bougault
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Waldemar Vollmer
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
| | - Jean-Pierre Simorre
- Institut de Biologie Structurale, UMR5075 (CEA/CNRS/UJF), 38027 Grenoble, France, Laboratoire de Chimie Inorganique et Biologique, UMR-E3 (CEA/UJF), FRE3200 (CEA/CNRS), INAC, CEA, 38054 Grenoble, France, Centre d’ingénierie des protéines, Institut de Chimie B6A, Université de Liège, Sart-Tilman, B4000 Liège, Belgium, and Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Richardson Road, Newcastle upon Tyne NE2 4AX, United Kingdom
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29
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Architecture of peptidoglycan: more data and more models. Trends Microbiol 2010; 18:59-66. [DOI: 10.1016/j.tim.2009.12.004] [Citation(s) in RCA: 244] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2009] [Revised: 10/28/2009] [Accepted: 12/08/2009] [Indexed: 01/09/2023]
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30
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Sharif S, Singh M, Kim SJ, Schaefer J. Staphylococcus aureus peptidoglycan tertiary structure from carbon-13 spin diffusion. J Am Chem Soc 2009; 131:7023-30. [PMID: 19419167 DOI: 10.1021/ja808971c] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The cell-wall peptidoglycan of Staphylococcus aureus is a heterogeneous, highly cross-linked polymer of unknown tertiary structure. We have partially characterized this structure by measuring spin diffusion from (13)C labels in pentaglycyl cross-linking segments to natural-abundance (13)C in the surrounding intact cell walls. The measurements were performed using a version of centerband-only detection of exchange (CODEX). The cell walls were isolated from S. aureus grown in media containing [1-(13)C]glycine. The CODEX spin diffusion rates established that the pentaglycyl bridge of one peptidoglycan repeat unit of S. aureus is within 5 A of the glycan chain of another repeat unit. This surprising proximity is interpreted in terms of a model for the peptidoglycan lattice in which all peptide stems in a plane perpendicular to the glycan mainchain are parallel to one another.
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Affiliation(s)
- Shasad Sharif
- Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
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31
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Burgess BR, Dobson RC, Bailey MF, Atkinson SC, Griffin MD, Jameson GB, Parker MW, Gerrard JA, Perugini MA. Structure and Evolution of a Novel Dimeric Enzyme from a Clinically Important Bacterial Pathogen. J Biol Chem 2008; 283:27598-27603. [DOI: 10.1074/jbc.m804231200] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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32
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Affiliation(s)
- Waldemar Vollmer
- Institute for Cell and Molecular Biosciences, Medical School, University of Newcastle upon Tyne, Newcastle upon Tyne, UK.
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McCallum N, Karauzum H, Getzmann R, Bischoff M, Majcherczyk P, Berger-Bächi B, Landmann R. In vivo survival of teicoplanin-resistant Staphylococcus aureus and fitness cost of teicoplanin resistance. Antimicrob Agents Chemother 2006; 50:2352-60. [PMID: 16801412 PMCID: PMC1489778 DOI: 10.1128/aac.00073-06] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Glycopeptide resistance, in a set of in vitro step-selected teicoplanin-resistant mutants derived from susceptible Staphylococcus aureus SA113, was associated with slower growth, thickening of the bacterial cell wall, increased N-acetylglucosamine incorporation, and decreased hemolysis. Differential transcriptome analysis showed that as resistance increased, some virulence-associated genes became downregulated. In a mouse tissue cage infection model, an inoculum of 10(4) CFU of strain SA113 rapidly produced a high-bacterial-load infection, which triggered MIP-2 release, leukocyte infiltration, and reduced leukocyte viability. In contrast, with the same inoculum of the isogenic glycopeptide-resistant derivative NM67, CFU initially decreased, resulting in the elimination of the mutant in three out of seven cages. In the four cages in which NM67 survived, it partially regained wild-type characteristics, including thinning of the cell wall, reduced N-acetylglucosamine uptake, and increased hemolysis; however, the survivors also became teicoplanin hypersusceptible. The elimination of the teicoplanin-resistant mutants and selection of teicoplanin-hypersusceptible survivors in the tissue cages indicated that glycopeptide resistance imposes a fitness burden on S. aureus and is selected against in vivo, with restoration of fitness incurring the price of resistance loss.
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Affiliation(s)
- N McCallum
- Institute of Medical Microbiology, University of Zürich, 8006 Zurich, Switzerland.
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Navarre WW, Schneewind O. Surface proteins of gram-positive bacteria and mechanisms of their targeting to the cell wall envelope. Microbiol Mol Biol Rev 1999; 63:174-229. [PMID: 10066836 PMCID: PMC98962 DOI: 10.1128/mmbr.63.1.174-229.1999] [Citation(s) in RCA: 925] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The cell wall envelope of gram-positive bacteria is a macromolecular, exoskeletal organelle that is assembled and turned over at designated sites. The cell wall also functions as a surface organelle that allows gram-positive pathogens to interact with their environment, in particular the tissues of the infected host. All of these functions require that surface proteins and enzymes be properly targeted to the cell wall envelope. Two basic mechanisms, cell wall sorting and targeting, have been identified. Cell well sorting is the covalent attachment of surface proteins to the peptidoglycan via a C-terminal sorting signal that contains a consensus LPXTG sequence. More than 100 proteins that possess cell wall-sorting signals, including the M proteins of Streptococcus pyogenes, protein A of Staphylococcus aureus, and several internalins of Listeria monocytogenes, have been identified. Cell wall targeting involves the noncovalent attachment of proteins to the cell surface via specialized binding domains. Several of these wall-binding domains appear to interact with secondary wall polymers that are associated with the peptidoglycan, for example teichoic acids and polysaccharides. Proteins that are targeted to the cell surface include muralytic enzymes such as autolysins, lysostaphin, and phage lytic enzymes. Other examples for targeted proteins are the surface S-layer proteins of bacilli and clostridia, as well as virulence factors required for the pathogenesis of L. monocytogenes (internalin B) and Streptococcus pneumoniae (PspA) infections. In this review we describe the mechanisms for both sorting and targeting of proteins to the envelope of gram-positive bacteria and review the functions of known surface proteins.
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Affiliation(s)
- W W Navarre
- Department of Microbiology & Immunology, UCLA School of Medicine, Los Angeles, California 90095, USA
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36
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Hiramatsu K. Vancomycin resistance in staphylococci. Drug Resist Updat 1998; 1:135-50. [PMID: 16904400 DOI: 10.1016/s1368-7646(98)80029-0] [Citation(s) in RCA: 145] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/1997] [Revised: 02/24/1998] [Accepted: 02/28/1998] [Indexed: 10/25/2022]
Abstract
Recent emergence of vancomycin resistance in methicillin-resistant Staphylococcus aureus (VRSA) has posed a new threat to hospital infection control and antibiotic chemotherapy. Relatively low-level resistance of VRSA compared to that of vancomycin-resistant enterococci (VRE), and prevalence of S. aureus clinical strains heterogeneously resistant to vancomycin (hetero-VRSA), challenge the value of routine antibiotic susceptibility tests as a tool for the prediction of clinical efficacy of vancomycin therapy. This review summarizes the history of emergence of glycopeptide resistance in staphylococci and considers the mechanism of resistance in these organisms.
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Affiliation(s)
- K Hiramatsu
- Department of Bacteriology, Juntendo University, Tokyo, Japan.
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37
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Prayitno NR, Archibald AR. Distribution of muropeptides in walls of Bacillus subtilis and a temperature-sensitive mutant. World J Microbiol Biotechnol 1996; 12:579-84. [PMID: 24415418 DOI: 10.1007/bf00327718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 01/31/1996] [Accepted: 02/03/1996] [Indexed: 11/26/2022]
Abstract
Attempts to correlate differences in cell shape with aspects of peptidoglycan structure were investigated. The parent strain, Bacillus subtilis 168, and its temperature-sensitive tagB mutant were grown in the chemostat under different growth conditions. The composition of the peptidoglycan was similar in all samples, regardless of cellular shape and anionic polymer content. Muropeptides, released by digestion with muramidase, comprised mainly dimers and monomers with only small amounts of trimer and traces of tetramer muropeptide. Overall, cross-linking did not vary greatly and the cross-linking index was less than 38%. Reverse-phase HPLC separation showed a complex fine structure. The principal muropeptides in all samples appeared to be the tetra monomer, tetra-tetra dimer and tetra-tetra-tetra trimer. While the major components looked the same in all samples, two specific components, a monomer and a dimer, were seen exclusively in the samples that had coccal morphology.
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Affiliation(s)
- N R Prayitno
- Microbial and Genetic Engineering Division, R & D Center for Biotechnology, The Indonesia Institute of Sciences, JI. Raya Bogor Km.46, 16911, Cibinong, Indonesia
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38
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Labischinski H, Maidhof H. Chapter 2 Bacterial peptidoglycan: overview and evolving concepts. BACTERIAL CELL WALL 1994. [DOI: 10.1016/s0167-7306(08)60405-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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39
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de Jonge BL, Sidow T, Chang YS, Labischinski H, Berger-Bachi B, Gage DA, Tomasz A. Altered muropeptide composition in Staphylococcus aureus strains with an inactivated femA locus. J Bacteriol 1993; 175:2779-82. [PMID: 8478340 PMCID: PMC204585 DOI: 10.1128/jb.175.9.2779-2782.1993] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Tn551 inactivation of femA, a factor involved in methicillin resistance of Staphylococcus aureus, caused the production of peptidoglycan in which the fraction of monoglycyl- and serine-containing muropeptides was increased at the expense of pentaglycyl muropeptides. femA mutants have a specific block in the biosynthesis of pentaglycine cross bridges after the addition of the first glycine residue.
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Affiliation(s)
- B L de Jonge
- Rockefeller University, New York, New York 10021
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Henze U, Sidow T, Wecke J, Labischinski H, Berger-Bächi B. Influence of femB on methicillin resistance and peptidoglycan metabolism in Staphylococcus aureus. J Bacteriol 1993; 175:1612-20. [PMID: 8383661 PMCID: PMC203954 DOI: 10.1128/jb.175.6.1612-1620.1993] [Citation(s) in RCA: 114] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The inactivation of FemB by insertion of Tn551 in the central part of the femB open reading frame was shown to increase susceptibility of methicillin-resistant Staphylococcus aureus strains toward beta-lactam antibiotics to the same extent as did inactivation of femA. Strains carrying the methicillin resistance determinant (mec) and expressing PBP 2' were affected to the same extent as were strains selected for in vitro resistance, which did not express PBP 2'. Both femA and femB, which form an operon, are involved in a yet unknown manner in the glycine interpeptide bridge formation of the S. aureus peptidoglycan. FemB inactivation was shown to reduce the glycine content of peptidoglycan by approximately 40%, depending on the S. aureus strain. The reduction of the interpeptide bridge glycine content led to significant reduction in peptidoglycan cross-linking, as measured by gel permeation high-pressure liquid chromatography of muramidase-digested cell walls. Maximum peptide chain length was reduced by approximately 40%. It is shown that the complete pentaglycine interpeptide bridge is important for the sensitivity against beta-lactam antibiotics and for the undisturbed activity of the staphylococcal cell wall-synthesizing and hydrolyzing enzymes, as was also apparent from electron microscopic examinations, which revealed aberrant placement of cross walls and retarded cell separation, leading to a pseudomulticellular phenotype of the cells for both femA and femB mutants.
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Affiliation(s)
- U Henze
- Institute of Medical Microbiology, University of Zürich, Switzerland
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Labischinski H. Consequences of the interaction of beta-lactam antibiotics with penicillin binding proteins from sensitive and resistant Staphylococcus aureus strains. Med Microbiol Immunol 1992; 181:241-65. [PMID: 1474963 DOI: 10.1007/bf00198846] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- H Labischinski
- Robert Koch-Institute of the Federal Health Organization, Berlin, Federal Republic of Germany
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de Jonge B, Chang Y, Gage D, Tomasz A. Peptidoglycan composition of a highly methicillin-resistant Staphylococcus aureus strain. The role of penicillin binding protein 2A. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(19)49903-1] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Gally DL, Hancock IC, Harwood CR, Archibald AR. Cell wall assembly in Bacillus megaterium: incorporation of new peptidoglycan by a monomer addition process. J Bacteriol 1991; 173:2548-55. [PMID: 1901569 PMCID: PMC207819 DOI: 10.1128/jb.173.8.2548-2555.1991] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The pattern of cross-linking in the peptidoglycan of Bacillus megaterium has been studied by the pulsed addition of radiolabeled diaminopimelic acid. The distribution of label in muropeptides, generated by digestion with Chalaropsis muramidase and separated by high-performance liquid chromatography, stabilized after 0.15 of a generation time. The proportion of label in the acceptor and donor positions of isolated muropeptide dimers stabilized over the same period of time. The results have led to the formulation a new model for the assembly of peptidoglycan into the cylindrical wall of B. megaterium by a monomer addition process. Single nascent glycan peptide strands form cross-linkages only with material at the inner surface of the wall. Maturation is a direct consequence of subsequent incorporation of further new glycan peptide strands, and there is no secondary cross-linking process. The initial distribution of muropeptides is constant. It follows that the final pattern of cross-linking in the wall is determined solely by, and can be forecast from, this repetitive pattern of incorporation. In a modified form, this model can also be applied to assembly of cell walls in rod-shaped gram-negative bacteria.
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Affiliation(s)
- D L Gally
- Department of Microbiology, Medical School, Newcastle upon Tyne, United Kingdom
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