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Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
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The type-specific substance from Pneumococcus type 33B.

M J Watson

    The Biochemical Journal
    |March 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

    The capsular polysaccharide (S. 33B) from Pneumococcus type 33B was analyzed, revealing its detailed chemical composition and structure. Its hexasaccharide core was elucidated, including phosphate residue locations.

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    Area of Science:

    • Microbiology
    • Carbohydrate Chemistry
    • Structural Biology

    Background:

    • Pneumococcus type 33B is a significant bacterial pathogen.
    • Understanding the composition of its capsular polysaccharide (S. 33B) is crucial for vaccine development and pathogenesis studies.

    Purpose of the Study:

    • To determine the detailed chemical composition of S. 33B.
    • To elucidate the structure of the hexasaccharide obtained after degradation.
    • To identify the locations of phosphate residues within S. 33B.

    Main Methods:

    • Chemical analysis of S. 33B for P, hexose, total sugar, galactosamine, and d-glucose content.
    • Alkali degradation and enzymic dephosphorylation of S. 33B to yield a hexasaccharide.
    • Structural elucidation of the hexasaccharide using spectroscopic techniques (implied).

    Main Results:

    • S. 33B contains 2.89% P, 51% hexose, 69% total sugar, 18% galactosamine, and 20% d-glucose.
    • Degradation yielded a hexasaccharide with the structure: O-beta-d-glucopyranosyl-(1-->5)-O-beta-d-galactofuranosyl-(1-->3)-O-2-acetamido-2-deoxy-beta-d-galactopyranosyl-(1-->4)-O-[alpha-d-galactopyranosyl-(1-->2)]-alpha-d-galactopyranosyl-(1-->2)-ribitol.
    • Phosphate groups are attached to the hydroxyl group at position 5 of ribitol units and position 6 of hexopyranose residues.

    Conclusions:

    • The complete structure of the S. 33B hexasaccharide has been determined.
    • The specific locations of phosphate modifications in S. 33B have been identified.
    • This structural information provides a basis for understanding the biological role of S. 33B and for developing targeted interventions.