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The structure of the O-specific polysaccharide chain of the Shewanella algae BrY lipopolysaccharide
Authors:Vinogradov Evgeny  Korenevsky Anton  Beveridge Terry J
Affiliation:Institute for Biological Sciences, National Research Council, 100 Sussex Dr., ON, K1A 0R6, Ottawa, Canada. evguenii.vinogradov@nrc.ca
Abstract:An acidic O-specific polysaccharide was obtained by mild acid degradation of the Shewanella algae strain BrY lipopolysaccharide and was found to contain L-rhamnose, 2-acetamido-4-[D-3-hydroxybutyramido)]-2,4,6-trideoxy-D-glucose (D-BacNAc4NHbu), and 2-amino-2,6-dideoxy-L-galactose, N-acylated by the 4-carboxyl group of L-malic acid (L-malyl-(4-->2)-alpha-L-FucN) in the ratio 2:1:1. 1H and 13C NMR spectroscopy was applied to the intact polysaccharide, and the following structure of the repeating unit was established:-3)-alpha-D-BacNAc4NHbu-(1-->3)-alpha-L-Rha-(1-->2)-alpha-L-Rha-(1-->2)-L-malyl-(4-->2)-alpha-L-FucN-(1-. The repeating unit includes linkage via the residue of malic acid, reported here for the first time as a component of bacterial polysaccharides.
Keywords:Lipopolysaccharide   O-Chain   Shewanella, S. algae
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