Structural elucidation of the specific capsular polysaccharide of Rhodococcus equi serotype 7

  • Masoud H
  • Richards J
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Structural analysis of the specific capsular polysaccharide produced by Rhodococcus equi serotype 7 indicated it to be a high-molecular-weight polymer consisting of equal molar amounts of d-galactose, d-mannose, l-rhamnose, and pyruvic acid. By employing a combination of chemical and NMR techniques, it was established that the polysaccharide is composed of the linear repeating trisaccharide units, {A figure is presented} →3)-α-d-Galp-(1→3)-α-d-Manp-(1→3)-α-l-Rhapp-(1→, in which the cyclic pyruvic acid acetal groups bridging the O-4 and O-6 positions of the α-d-Manp residues have the S-configuration. The1H and13C NMR spectra of the native and pyruvic acetal-free polysaccharides were fully assigned. © 1994.

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  • Hussein Masoud

  • James C. Richards

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