title: Proteases of an early colonizer can hinder Streptococcus mutans colonization in vitro.
abstract: Streptococcus mutans is the primary cariogen that produces several virulence factors that are modulated by a competence-stimulating peptide (CSP) signaling system. In this study, we sought to determine if proteases produced by early dental plaque colonizers such as Streptococcus gordonii interfere with the subsequent colonization of S. mutans BM71 on the existing streptococcal biofilms. We demonstrated that S. mutans BM71 colonized much less efficiently in vitro on streptococcal biofilms than on Actinomyces naeslundii biofilms. Several oral streptococci, relative to A. naeslundii, produced proteases that inactivated the S. mutans CSP. We further demonstrated that cell protein extracts from S. gordonii, but not from A. naeslundii, interfered with S. mutans BM71 colonization. In addition, S. mutans BM71 colonized more efficiently on the sgc protease knockout mutant of S. gordonii than on the parent biofilms. In conclusion, proteases of early colonizers can interfere with subsequent colonization by S. mutans in vitro.
authors.affiliation: Department of Periodontics and Endodontics, University at Buffalo, State University of New York, Buffalo, NY 14214, USA. bwang@buffalo.edu
authors.forename: B-Y
authors.initials: BY
authors.lastname: Wang
authors.forename: A
authors.initials: A
authors.lastname: Deutch
authors.forename: J
authors.initials: J
authors.lastname: Hong
authors.forename: H K
authors.initials: HK
authors.lastname: Kuramitsu
mesh_terms: D000190:Actinomyces / Q000502:physiology; D000898:Antibiosis; D001422:Bacterial Adhesion / Q000187:drug effects; D001426:Bacterial Proteins / Q000187:drug effects / Q000494:pharmacology*; D001430:Bacteriocins / Q000032:analysis; D001431:Bacteriological Techniques; D018441:Biofilms; D002364:Caseins / Q000187:drug effects; D003773:Dental Plaque / Q000382:microbiology; D055786:Gene Knockout Techniques; D006801:Humans; D010447:Peptide Hydrolases / Q000494:pharmacology*; D057057:Serine Proteases / Q000494:pharmacology; D013291:Streptococcus / Q000201:enzymology; D054773:Streptococcus gordonii / Q000201:enzymology* / Q000235:genetics / Q000502:physiology; D034361:Streptococcus mitis / Q000201:enzymology; D013295:Streptococcus mutans / Q000187:drug effects* / Q000502:physiology; D019533:Streptococcus oralis / Q000201:enzymology
chemical_list: D001426:Bacterial Proteins; D001430:Bacteriocins; D002364:Caseins; C026018:azocasein; C423628:competence factor, Streptococcus; D010447:Peptide Hydrolases; D057057:Serine Proteases