[Structure of the O-specific polysaccharide chain of the lipopolysaccharide from Yersinia intermedia serotype O:4.33].

O-specific polysaccharide has been isolated on autohydrolysis of lipopolysaccharide from Yersinia intermedia O: 4.33 (strain 1476) and shown to consist of the yersiniose B (3.6-dideoxy-4-C-(1-hydroxyethyl)-xylo-hexose) and 2-acetamido-2-deoxy-D-galactose residues in a molar ratio of 1 : 2. Acid hydrolysis, methylation. solvolysis with anhydrous hydrogen fluoride. and 13C-NMR studies indicate the polysaccharide to be composed of trisaccharide repeating units of the following structure: (Formula: see text).