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  • Title: Immunochemical characterization of type i carbohydrate antigen of "Streptococcus milleri" (Streptococcus anginosus).
    Author: Konagawa R, Yakushiji T, Inoue M.
    Journal: Zentralbl Bakteriol; 1990 Oct; 274(1):40-9. PubMed ID: 2124490.
    Abstract:
    Type-specific carbohydrate antigen of the serotype i "Streptococcus milleri" was extracted with trichloroacetic acid from purified cell walls of the type strain K39K. The extracts were then purified by chromatography on DEAE-Sephadex A-25 and Sephadex G-100 columns. The purified serotype i carbohydrate antigen produced a single precipitin band against its homologous type-specific antiserum, which fused with the band produced by the autoclaved extract of the type strain cells. The serotype i antigen was a polysaccharide composed of rhamnose, galactose and glucose in a molar ratio of 1.6:6.8:1.0. The quantitative precipitin inhibition test with various haptenic sugars showed that galactose as well as lactose produced the greatest inhibition, which suggested that a galactose in terminal beta linkage is the immunodeterminant of the serotype i-specific antigen. Galactose was detected in the autoclaved extracts from cells of all the 15 serotype i strains tested.
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