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[The structure of O-specific polysaccharide of Yersinia frederiksenii serotype O:16,29 lipopolysaccharide].

A branched chain octose, 3,6-dideoxy-4-C-(L-glycero-1'-hydroxyethyl)-D-xylo- hexose, was isolated from the lipopolysaccharide of Yersinia frederiksenii, serovar O: 16.29 and identified as yersiniose A from Y. pseudotuberculosis, serovar VI. Mild hydrolysis of the lipopolysaccharide with acetic acid afforded a rhamnan. Structural features of the trisaccharide repeating unit were elucidated on the basic of 13C NMR spectral data, methylation studies and periodate oxidation. Using these data as well as data on sugar composition and methylation studies of the lipopolysaccharide, the following structural pattern of the repeating unit of O-specific polysaccharide was proposed: (formula; see text)