Structure of the O‐chain of the phenol‐phase soluble cellular lipopolysaccharide of Yersinia enterocolitica serotype O:9

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Abstract
The phenol-phase soluble cellular lipopolysaccharide isolated by the phenol/water extraction method from Yersinia enterocolitica serotpye O:9 cells was shown by hydrolytic, periodate oxidation, methylation and nuclear magnetic resonance studies to be an S-type lipopolysaccharide with a linear O-antigenic polysaccharide of 1,2-linked 4,6-dideoxy-4-formamido-α-d-mannopyranosyl units. The serological cross-reactivity between Y. enterocolitica serotype O:9 and the lipopolysaccharides of Vibrio cholerae and Brucella species can now be related to the presence of N-acylated 4-amino-4, 6-dideoxy-α-d-mannopyranosyl residues in their respective O-antigenic chains.