The contribution of the subtilisin-like proteinase to virulence w

The contribution of the subtilisin-like proteinase to virulence was investigated in a mouse model. We found that the proteinase-deficient Tn917 mutants were significantly less virulent in mice. This clearly suggests that the S. suis subtilisin-like proteinase is an virulence determinant. Ge et al. [39] recently constructed a dipeptidyl peptidase IV deficient-mutant of S. suis and provided evidence for the critical role of this enzyme in the virulence of S. suis in a mouse model. This cell surface enzyme cleaves X-Pro/Ala dipeptides from the N-terminus of proteins but also possesses binding domains for fibronectin [39]. Given

the involvement of the cell surface subtilisin-like serine proteinase in S. suis virulence, check details studies are in progress to clone this proteinase and determine whether it may represent a promising candidate for a protein-based vaccine. Conclusion In summary, we identified a gene that codes for a cell surface subtilisin-like serine proteinase and that is widely distributed in S. suis strains. Evidences were brought for the involvement of this proteinase in S. suis virulence. Acknowledgements This study was supported by a grant from the Natural Sciences and Engineering Research Council of Canada (NSERC). We thank S. Lacouture, M.-P. Levasseur, and A. Turgeon for their technical assistance. References 1. Higgins R, Gottschalk M: Streptococcal Diseases. In Diseases

of Swine. 9th edition. Edited by: Straw BE, D’Allaire

S, Mengeling WL, Taylor DJ. Iowa: Iowa University Press; 2005:769–783. 2. Lun ZR, Wang QP, Chen XG, Li AX, Zhu XQ: Streptococcus suis : an emerging zoonotic pathogen. Lancet Infect EPZ015666 Dis 2007, 7:201–209.PubMedCrossRef 3. Wertheim HF, Nghia HD, Taylor W, Schultsz C: Streptococcus suis : an emerging human pathogen. Clin Infect Dis 2009, 48:617–625.PubMedCrossRef 4. Gottschalk M, Segura M: The pathogenesis of the meningitis caused by Streptococcus suis : the unresolved questions. Vet Microbiol 2000, 76:259–272.PubMedCrossRef 5. Segura M, Gottschalk M: Extracellular virulence selleck products factors of streptococci associated with animal diseases. Front Biosci 2004, 9:1157–1188.PubMedCrossRef 6. Charland N, Harel J, Kobisch M, Lacasse S, Gottschalk M: Streptococcus Vildagliptin suis serotype 2 mutants deficient in capsular expression. Microbiology 1998, 144:325–332.PubMedCrossRef 7. Baums CG, Valentin-Weigand P: Surface-associated and secreted factors of Streptococcus suis in epidemiology, pathogenesis and vaccine development. Anim Health Res Rev 2009, 10:65–83.PubMedCrossRef 8. Maeda H: Role of microbial proteases in pathogenesis. Microbiol Immunol 1996, 40:685–699.PubMed 9. Travis J, Potempa J: Bacterial proteinases as targets for the development of second-generation antibiotics. Biochim Biophys Acta 2000, 1477:35–50.PubMedCrossRef 10. Jobin MC, Grenier D: Identification and characterization of four proteases produced by Streptococcus suis .

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