Dr St茅phane Mesnage
School of Biosciences
Senior Lecturer
+44 114 222 4405
Full contact details
School of Biosciences
Firth Court
Western Bank
葫芦影业
S10 2TN
- Profile
-
- 2019 - present: Senior Lecturer, School of Biosciences, University of 葫芦影业, UK
- 2012 - 2018: Lecturer, Dept. of Molecular Biology and Biotechnology, University of 葫芦影业, UK
- 2010 - 2012: Marie Curie (IEF) Fellow, Dept. of Molecular Biology and Biotechnology, University of 葫芦影业, UK
- 2002 - 2010: INSERM Charg茅 de Recherches, University of Paris 6, France
- 2000 - 2002: EMBO Research assistant, John Innes Centre, Norwich, UK
- 1996 - 2000: PhD, Pasteur Institute, Paris, France
- Research interests
-
My work is focused on the study of the bacterial cell wall using essentially two Gram-positive pathogens (Staphylococcus aureus, Enterococcus faecalis) as models. I am interested in three major areas of research.
Analysis of protein-cell wall interactions
The essential cell wall peptidoglycan polymer network forms a scaffold for the display of a large variety of proteins involved in cell division, metabolism, cell-cell communication and in pathogen interaction with the host. Although several multimodular cell wall binding domains have been identified to date in bacteria, both their structural organisation and binding mechanism (binding motif, subcellular localisation) have remained elusive.
The aim of this project is to understand the molecular mechanisms underpinning protein-bacterial cell wall interactions and subcellular localisation of surface proteins.
Beyond these fundamental questions, the aim is to develop a translational research program to (i) develop peptidoglycan binding domains as new functional probes to provide a nanoscale topological map of the cell surface; (ii) provide an experimental rationale to engineer and target therapeutic molecules against pathogens.
This project involves multidisciplinary approaches across several disciplines including molecular biology, biochemistry, biophysics, structural biology and state-of-the-art super resolution microscopy.
Control of peptidoglycan hydrolysis during growth
During growth, the insertion of new precursors and separation of daughter cells requires limited cleavage of the peptidoglycan molecule by peptidoglycan hydrolases.
Depending on the bond they cleave, these enzymes are classified as N-acetylmuramidases, N-acetylglucosaminidases, N-acetylmuramoyl L-alanine amidases, endopeptidases or carboxypeptidases (Fig. 2). In addition to their contribution to cell growth and division, some peptidoglycan hydrolases play a role in adhesion and in amplification of the inflammatory response by releasing muramyl-peptides.
The lytic activity of some peptidoglycan hydrolases (called autolysins) is potentially lethal and can lead to cell lysis and death. How bacteria control autolytic activities is poorly understood.
I am studying several mechanisms that may be responsible for the control of autolytic activities: (i) the subcellular targeting of autolysins; (ii) the impact of peptidoglycan structural properties on autolytic activities and (iii) the contribution of the electrochemical gradient across the cytoplasmic membrane to the control of peptidoglycan hydrolysis.
We routinely analyse peptidoglycan hydrolase substrate specificity by a combination of rp-HPLC and mass spectrometry. The enzymatic activity of autolysins is measured spectrophotometrically.
Role of Enterococcus faecalis cell wall metabolism in the interaction with the host
Lysozyme is the major component of the innate immune system and represents the first line of defense against pathogens. E. faecalis is highly resistant to lysozyme, with a minimal inhibitory concentration (MIC) above 50 mg/ml.
This extreme resistance has been partly explained by an additive effect of peptidoglycan O-acetylation and de-N-acetylation, as well as teichoic acid D-alanylation. It was also shown that full lysozyme resistance requires a signalling cascade involving the extracytoplasm
ic function (ECF) sigma factor SigV. Interestingly, E. faecalis strains harbouring multiple deletions in these pathways are still resistant to lysozyme. The identification of novel factors involved in lysozyme resistance is currently underway using random transposon mutagenesis. The mutants isolated will be further characterised in vivo.
- Publications
-
Show: Featured publications All publications
Featured publications
Journal articles
All publications
Journal articles
- . Carbohydrate Polymers, 347, 122686-122686.
- . Virus Research, 347, 199426-199426.
- . Carbohydrate Polymers, 122983-122983.
- . Journal of Biological Chemistry, 105529-105529.
- . Journal of Biological Chemistry, 105494-105494.
- . Communications Biology, 6(1).
- . Nature Communications, 13(1).
- . Journal of Biological Chemistry.
- . International Journal of Molecular Sciences, 22(13).
- . Cell Reports, 31(12).
- . mBio, 11(2).
- . Nature Chemical Biology.
- . Cell, 179(3), 703-712.e7.
- . Infection and Immunity.
- . PLOS Pathogens, 15(5).
- . Nature Communications, 9(1).
- . eLife, 7.
- . BMC Genomics, 18(1).
- . PLoS Pathogens, 13(7).
- . IUCrJ, 4(Pt 2), 185-198.
- . Analytical and Bioanalytical Chemistry, 409(2), 551-560.
- . Applied and Environmental Microbiology, 82(16), 4975-4981.
- . Frontiers in Microbiology, 7.
- . mBio, 6(4).
- . Molecular Microbiology, 96(3), 596-608.
- . MicrobiologyOpen, 4(2), 220-234.
- . Journal of Biological Chemistry, 290(8), 5203-5213.
- . Nat Commun, 5, 4269.
- . J Biol Chem, 289(25), 17767-17779.
- . Infect Immun, 81(11), 4271-4279.
- . Mol Microbiol, 87(5), 1100-1112.
- , 1, 1401-1407.
- . J Bacteriol, 194(22), 6066-6073.
- . Molecular Microbiology, 82(5), 1096-1109.
- . Antimicrob Agents Chemother, 55(2), 910-912.
- . J Mol Biol, 398(4), 507-517.
- . FEBS Lett, 583(18), 3033-3038.
- . Antimicrob Agents Chemother, 53(4), 1667-1669.
- . J Biol Chem, 283(28), 19845-19853.
- . Nucleic Acids Res, 35(20), 6870-6883.
- . FEBS Lett, 581(4), 693-696.
- . J Bacteriol, 188(24), 8513-8519.
- . Proc Natl Acad Sci U S A, 103(13), 5012-5017.
- . J Bacteriol, 187(11), 3833-3838.
- . Int J Med Microbiol, 293(7-8), 619-624.
- . J Bacteriol, 184(23), 6448-6456.
- . Science, 297(5579), 243-246.
- . Mol Microbiol, 43(6), 1615-1627.
- . Curr Top Microbiol Immunol, 271, 87-113.
- . J Bacteriol, 184(1), 331-334.
- . Microbiology, 147(Pt 5), 1343-1351.
- Conserved anchoring mechanisms between crystalline cell surface S-layer proteins and secondary cell wall polymers in Gram-positive bacteria? Response. TRENDS MICROBIOL, 9(2), 49-50.
- . EMBO J, 19(17), 4473-4484.
- . Infect Immun, 67(9), 4847-4850.
- . J Appl Microbiol, 87(2), 251-255.
- . J Appl Microbiol, 87(2), 256-260.
- . Mol Microbiol, 31(3), 927-936.
- . J Bacteriol, 180(1), 52-58.
- . FEMS Microbiology Reviews, 20(1-2), 47-98.
- . FEMS Microbiol Rev, 20(1-2), 47-98.
- . Mol Microbiol, 23(6), 1147-1155.
- . Gene, 170(2), 213-216.
- . Molecular Microbiology.
- . PHAGE.
- . Biomolecular NMR Assignments.
- . Nature Microbiology.
- . eLife, 10.
Chapters
- , Protein Bioinformatics (pp. 111-132). Springer US
- , Handbook of Proteolytic Enzymes (pp. 1401-1407). Elsevier
Conference proceedings papers
- Determining the structure of the enterococcal polysaccharide antigen. FEBS OPEN BIO, Vol. 12 (pp 41-41)
- A Family of T6SS Antibacterial Effectors related to L,D-transpeptidases Targets the Peptidoglycan. BIOPHYSICAL REVIEWS, Vol. 13(6) (pp 1408-1409)
- Automated Analysis of Bacterial Peptidoglycan Structure. GLYCOBIOLOGY, Vol. 26(12) (pp 1457-1457)
Preprints
Links