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Related Experiment Videos

Glycerolphosphate-containing cell wall polysaccharides from Streptococcus sanguis.

L I Emdur, C Saralkar, J G McHugh

    Journal of Bacteriology
    |November 1, 1974
    PubMed
    Summary

    Six unique cell wall polysaccharides from Streptococcus sanguis were purified and characterized. Formamide extraction appears to break phosphodiester bonds, yielding varied polysaccharide structures from a common precursor.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Glycobiology

    Background:

    • Streptococcus sanguis possesses complex cell wall structures.
    • Understanding bacterial cell wall composition is crucial for antimicrobial development.

    Purpose of the Study:

    • To purify and characterize novel glycerolphosphate-containing tetraheteroglycans from Streptococcus sanguis.
    • To investigate the structural integrity and origin of these polysaccharides.

    Main Methods:

    • Purification using alcohol/acetone precipitation and Sephadex G-75/DEAE-cellulose chromatography.
    • Purity assessment via analytical disc gel electrophoresis and immune double diffusion.
    • Structural analysis including polyacrylamide gel electrophoresis and formamide treatment.

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    Main Results:

    • Six pure tetraheteroglycans (a, b-1 to b-5) were isolated.
    • Polysaccharides shared similar molar ratios of l-rhamnose, d-glucose, and N-acetyl d-glucosamine but differed in glycerol and phosphate content.
    • Formamide treatment induced changes in polysaccharide mobility, suggesting phosphodiester bond breakage.

    Conclusions:

    • The isolated polysaccharides represent fragments of a common cell wall polysaccharide.
    • Formamide extraction at high temperatures can lead to artifactual degradation via phosphodiester bond cleavage.
    • Preliminary data suggest l-rhamnose as the terminal sugar and glycerol linked via a phosphodiester bond.