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Proteolytic activity of oral streptococci
K A Homer1, R A Whiley, D Beighton
1Hunterian Dental Research Unit, London Hospital Medical College, U.K.
FEMS Microbiology Letters
|February 1, 1990
Summary
Oral streptococci exhibit varying proteolytic activity, with Streptococcus oralis and Streptococcus sanguis showing the highest. This enhanced protein degradation may contribute to their success in dental plaque environments.
Area of Science:
- Microbiology
- Oral Biology
- Biochemistry
Background:
- Oral streptococci are key colonizers of the human mouth.
- Proteolytic activity in oral bacteria can influence the oral environment and microbial ecology.
- Understanding the enzymatic capabilities of different oral streptococci is crucial for dental research.
Purpose of the Study:
- To compare the proteolytic activity among eight species of oral streptococci.
- To investigate the correlation between bacterial protein degradation and the hydrolysis of synthetic substrates.
- To explore the potential role of proteolytic activity in the ecological success of Streptococcus oralis in dental plaque.
Main Methods:
- Assessed the proteolytic activity of eight oral streptococci species by measuring the degradation of fluorescein isothiocyanate-conjugated bovine serum albumin (FITC-BSA).
- Measured the hydrolysis of synthetic endopeptidase substrates to quantify enzymatic activity.
- Correlated FITC-BSA degradation with the hydrolysis rates of synthetic substrates.
Main Results:
- Streptococcus mutans and Streptococcus sobrinus demonstrated the lowest proteolytic activity.
- Streptococcus oralis and Streptococcus sanguis exhibited the highest proteolytic activity among the tested species.
- A significant positive correlation was observed between the degradation of FITC-BSA and the hydrolysis of synthetic endopeptidase substrates.
Conclusions:
- Proteolytic activity varies significantly among oral streptococci species.
- The ability to degrade proteins, as measured by FITC-BSA hydrolysis, is linked to the breakdown of synthetic endopeptidase substrates.
- The pronounced proteolytic capacity of Streptococcus oralis may be a contributing factor to its proliferation and success within dental plaque, particularly in nutrient-limited conditions.