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Adhesin degradation: a possible function for a Prevotella loescheii protease?
1Laboratory of Microbial Ecology, National Institute of Dental Research, US National Institutes of Health, Bethesda, Maryland.
Oral Microbiology and Immunology
|October 1, 1993
Summary
Prevotella loescheii produces a protease that breaks down a key adhesin involved in coaggregation with Streptococcus oralis. This enzyme may facilitate bacterial detachment and relocation within dental plaque biofilms.
Area of Science:
- Microbiology
- Oral biology
- Enzymology
Background:
- Prevotella loescheii is a bacterium found in dental plaque.
- Bacterial coaggregation is a crucial process in biofilm formation.
- Proteases play diverse roles in bacterial physiology and interactions.
Purpose of the Study:
- To characterize the proteases produced by Prevotella loescheii PK1295.
- To identify the specific protease responsible for hydrolyzing the coaggregation adhesin.
- To elucidate the potential role of this protease in bacterial detachment and relocation.
Main Methods:
- Isoelectric focusing to separate proteases.
- Enzyme activity assays using various substrates including a fimbria-associated adhesin.
- Biochemical characterization of the active protease (isoelectric point, molecular weight).
Main Results:
- At least three distinct proteases were identified in P. loescheii PK1295.
- A specific protease (pI 8.5, Mr 36,000) was found to hydrolyze the adhesin mediating coaggregation with Streptococcus oralis 34.
- This protease also degraded gelatin, casein, and fibrin.
Conclusions:
- Prevotella loescheii possesses a potent protease capable of cleaving its own coaggregation adhesin.
- This proteolytic activity may enable P. loescheii to detach from Streptococcus oralis.
- The findings suggest a mechanism for bacterial relocation within dental plaque ecosystems.