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  • Title: Structural investigation of an extracellular polysaccharide produced by the cariogenic bacterium Streptococcus mutans strain UA159.
    Author: Li B, Dobruchowska JM, Hoogenkamp MA, Gerwig GJ.
    Journal: Carbohydr Polym; 2012 Sep 01; 90(1):675-82. PubMed ID: 24751092.
    Abstract:
    The structure of an extracellular polysaccharide EPS159 produced from sucrose by Streptococcus mutans UA159 was investigated through the main oligosaccharides obtained from partial acid hydrolysis, monosaccharide/methylation analysis, and 1D/2D (1)H NMR spectroscopy. The results showed that EPS159 contained terminal, 3-substituted, 6-substituted, and 3,6-disubstituted α-D-glucopyranose residues in a molar percentage of 14, 18, 54, and 14%. The backbone of EPS159 was composed of →6)Glcp(1→ residues, and about 20% of the →6)Glcp(1→ residues was substituted at 3-OH by →3)Glcp(1→ and/or Glcp(1→ residues to form side chains. A composite model of EPS159, that includes all identified structural features, was formulated: [Formula, see text:].
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