151. Analysis of the Streptococcus agalactiae exoproteome
- Author
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Concetta Beninati, Salvatore Papasergi, I Pernice, Carmelo Biondo, Roberta Galbo, Patrick Trieu-Cuot, Claire Poyart, Giacomo Signorino, Maria Domina, Giuseppe Teti, Veronica Lanza-Cariccio, Elie Metchnikoff Laboratory, University of Messina, Dipartimento di Scienze Biologiche e Ambientali, Service de Bactériologie, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Cochin [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Biologie des Bactéries pathogènes à Gram-positif, Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS), This study was supported by grants Progetti di Ricerca di Rilevante Interesse nazionale 2005 (DM n° 287/2005) and 2008 (DM n° 1407/2008) from the Ministero dell'Istruzione, dell'Università e della Ricerca of Italy., and Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Proteomics ,Proteome ,Virulence Factors ,Biophysics ,Virulence ,Biology ,medicine.disease_cause ,Biochemistry ,Mass Spectrometry ,Microbiology ,Streptococcus agalactiae ,03 medical and health sciences ,Bacterial Proteins ,Bacterial infections ,Gene expression ,medicine ,Extracellular ,Secretion ,Pathogen ,030304 developmental biology ,0303 health sciences ,030306 microbiology ,Streptococcus ,Streptococcal Vaccines ,[SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology ,3. Good health - Abstract
The two-component regulatory system CovRS is the main regulator of virulence gene expression in Group B Streptococcus (GBS), the leading cause of invasive infections in neonates. In this study we analyzed by mass spectrometry the GBS extracellular protein complex (i.e. the exoproteome) of NEM316 wild-type (WT) strain and its isogenic covRS deletion mutant (ΔcovRS). A total of 53 proteins, 49 of which had classical secretion signals, were identified: 12 were released by both strains while 21 and 20 were released exclusively by WT and ΔcovRS strains, respectively. In addition to known surface proteins, we detected here unstudied cell-wall associated proteins and/or orthologs of putative virulence factors present in other pathogenic streptococci. While the functional role of these proteins remains to be elucidated, our data suggest that the analysis of the exoproteome of bacterial pathogens under different gene expression conditions may be a powerful tool for the rapid identification of novel virulence factors and vaccine candidates. Biological significance We believe that this manuscript will be of interest to Journal of Proteomics readers since the paper describes the identification of several putative virulence factors and vaccine candidates of the group B streptococcus, an important pathogen, using a simple proteomics strategy involving LC–MS analysis of culture supernatants obtained from two strains with divergent gene expression patterns. This technique provided the most comprehensive inventory of extracellular proteins obtained from a single streptococcal species thus far. The approach described has the added benefit of being easily applicable to a large number of different strains, making it ideal for the identification of conserved vaccine candidates.
- Published
- 2013