1887

Abstract

is found ubiquitously in the human oral cavity and is mainly associated with bacterial communities implicated in the establishment and development of periodontal disease. The ability to become integrated within biofilm communities is crucial to the growth and survival of oral bacteria, and involves inter-bacterial coaggregation, metabolic cooperation, and synergy against host defences. In this article we show that the chymotrypsin-like proteinase (CTLP), found within a high-molecular-mass complex on the cell surface, mediates adherence of to other potential periodontal pathogens, , , and . Proteolytic activity per se did not appear to be required for the interactions, and expression of the major outer-sheath protein (Msp) was not necessary, except for binding . Biofilms of densely packed cells and matrix, up to 40 µm in depth, were formed between and on salivary pellicle, with cells enriched in the upper layers. Expression of CTLP, but not Msp, was critical for dual-species biofilm formation with . did not form dual-species biofilms with any of the other three periodontal bacterial species under various conditions. Synergy between and was also shown by increased inhibition of blood clotting, which was CTLP-dependent. The results demonstrate the critical role of CTLP in interactions of with other oral micro-organisms, leading to synergy in microbial community development and host tissue pathogenesis.

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2012-03-01
2021-08-01
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