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Intergeneric Communication in Dental Plaque Biofilms

By Hua Xie, Guy S. Cook, J. William Costerton, Greg Bruce, Timothy M. Rose and Richard J. Lamont


Dental plaque is a complex biofilm that accretes in a series of discrete steps proceeding from a gram-positive streptococcus-rich biofilm to a structure rich in gram-negative anaerobes. This study investigated information flow between two unrelated plaque bacteria, Streptococcus cristatus and Porphyromonas gingivalis. A surface protein of S. cristatus caused repression of the P. gingivalis fimbrial gene (fimA), as determined by a chromosomal fimA promoter-lacZ reporter construct and by reverse transcription-PCR. Signaling activity was associated with a 59-kDa surface protein of S. cristatus and showed specificity for the fimA gene. Furthermore, P. gingivalis was unable to form biofilm microcolonies with S. cristatus. Thus, S. cristatus is capable of modulating virulence gene expression in P. gingivalis, consequently influencing the development of pathogenic plaque

Topics: Physiology and Metabolism
Publisher: American Society for Microbiology
Year: 2000
OAI identifier:
Provided by: PubMed Central
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