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Variations in surface polymers of Streptococcus mutans.

D C Ellwood, J K Baird, J R Hunter

    Journal of Dental Research
    |April 1, 1976
    PubMed
    Summary
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    Streptococcus mutans cell wall composition and serological grouping show similarities, but enzyme activity varies. One strain, Ingbritt LH, produced different polysaccharides, possibly due to lab culture versus reisolation.

    Area of Science:

    • Microbiology
    • Biochemistry
    • Immunology

    Background:

    • Streptococcus mutans (S. mutans) is a key cariogenic bacterium.
    • Cell wall composition and serological grouping are important for bacterial classification.
    • Glycosyltransferases synthesize polysaccharides crucial for bacterial structure and function.

    Purpose of the Study:

    • To investigate the correlation between cell wall composition, serological grouping, and glycosyltransferase activity in S. mutans.
    • To identify variations in polysaccharide synthesis among different S. mutans strains.

    Main Methods:

    • Analysis of cell wall sugars and proteins.
    • Serological grouping of S. mutans strains.
    • Enzymatic assays of glycosyltransferases using sucrose as a substrate.

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    Main Results:

    • Cell wall composition generally correlated with serological groups, with notable similarities between groups c and E.
    • Polysaccharide structures formed by glycosyltransferases from groups b and d showed similarities, but enzyme activity varied.
    • Three Ingbritt strains had identical cell wall composition but differed in polysaccharide synthesis by their glycosyltransferases, with Ingbritt LH showing distinct differences.

    Conclusions:

    • Serological grouping and cell wall composition are related but do not fully explain variations in glycosyltransferase activity.
    • Environmental factors, such as laboratory culture versus reisolation (e.g., Ingbritt LH vs. Ingbritt B), may influence polysaccharide synthesis.
    • Further research is needed to elucidate the mechanisms behind observed differences in polysaccharide production, particularly in strains commonly found in dental plaque.