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Related Experiment Videos

The type-specific polysaccharides of Streptococcus suis.

S D Elliott, J Y Tai

    The Journal of Experimental Medicine
    |December 1, 1978
    PubMed
    Summary

    This study isolated and characterized capsular polysaccharides from Streptococcus suis types 1 and 2. The findings reveal distinct sugar compositions and molar ratios, aiding in understanding bacterial serotypes.

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    AN INACTIVE PRECURSOR OF STREPTOCOCCAL PROTEINASE.

    The Journal of experimental medicine·2009

    Area of Science:

    • Microbiology
    • Biochemistry
    • Immunology

    Background:

    • Streptococcus suis is a significant zoonotic pathogen.
    • Understanding the composition of its capsular polysaccharides is crucial for serotyping and vaccine development.

    Purpose of the Study:

    • To isolate and characterize the type-specific capsular polysaccharides of Streptococcus suis types 1 and 2.
    • To compare these polysaccharides with those of group B streptococci.

    Main Methods:

    • Lysozyme digestion of Streptococcus suis types 1 and 2.
    • Isolation of capsular polysaccharides via ethanol precipitation.
    • Purification and characterization using Sepharose 6B chromatography and Kd value determination.

    Main Results:

    • Purified type 1 polysaccharide contains galactose, glucose, N-acetyl glucosamine, N-acetyl galactosamine, and sialic acid (Kd=0.074).
    • Purified type 2 polysaccharide contains rhamnose, galactose, glucose, N-acetyl glucosamine, and sialic acid (Kd=0.185).
    • Distinct molar ratios were determined for the sugar components of both types.

    Conclusions:

    • The study successfully isolated and characterized the capsular polysaccharides of S. suis types 1 and 2.
    • The distinct chemical compositions provide a basis for serological differentiation and potential therapeutic strategies.

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