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Structural studies of the capsular polysaccharide from Aerococcus viridans var. homari.

✍ Scribed by Kerstin Hermansson; Lennart Kenne; Bengt Lindberg; B. Arie; Robert G. Brown; James E. Stewart

Book ID
102992547
Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
490 KB
Volume
208
Category
Article
ISSN
0008-6215

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✦ Synopsis

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.

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