Abstract
The structure of the Vibrio mimicus W-26768 O-antigen polysaccharide has been investigated by sugar and methylation analyses, Smith degradation, and NMR spectroscopy. It is proposed that it is composed of chains of β-(1 → 4)-linked 3,6-dideoxy-3-[( R)-3-hydroxybutyramido]- d-glucopyranosyl residues ( d-Qui p3NR), ∼60% of which are substituted in the 2-position with 2-acetamido-2-deoxy-α- d-galactopyranosyl groups. The polysaccharide does not seem to be composed of oligosaccharide repeating units but has a less regular structure, schematically indicated below. ▪
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