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Structural studies of the capsular polysaccharide from Aerococcus viridans var. homari
K Hermansson1, L Kenne, B Lindberg
1Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, Sweden.
Abstract:
The capsular polysaccharide from Aerococcus viridans var. homari has been investigated, using n.m.r. spectroscopy, methylation analysis, and specific degradations as the main methods. The polysaccharide is composed of tetrasaccharide repeating-units having the following structure. (Formula; see text) In this structure, D-QuiN stands for 2-amino-2,6-dideoxy-D-glucose (quinovosamine). Two of the three acidic sugars found, namely, L-altruronic acid and 4-O-[(S)-1-carboxyethyl]-D-glucose, have not been found in any other natural source. As evident from the n.m.r. spectra, the L-altruronic acid is not present in the 1C4 conformation, but flips to a conformation close to this on carboxyl reduction.