Structure of the O-polysaccharide of Pseudomonas syringae pv. delphinii NCPPB 1879(T) having side chains of 3-acetamido-3,6-dideoxy-D-galactose residues |
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Authors: | Zdorovenko E L Zatonsky G V Kocharova N A Shashkov A S Knirel Y A Ovod V V |
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Affiliation: | Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia. |
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Abstract: | The O-polysaccharide (OPS) was obtained from the lipopolysaccharide of Pseudomonas syringae pv. delphinii NCPPB 1879(T) and studied by sugar and methylation analyses, Smith degradation, and (1)H- and (13)C-NMR spectroscopy. The OPS was found to contain residues of L-rhamnose (L-Rha) and 3-acetamido-3,6-dideoxy-D-galactose (D-Fuc3NAc), and the following structure of the major (n = 2) and minor (n = 3) heptasaccharide repeating units of the OPS was established: [carbohydrate structure: see text]. The OPS is distinguished by the presence of oligosaccharide side chains consisting of three D-Fuc3NAc residues that are connected to each other by the (alpha 1-->2)-linkage. The OPS is characterized by a structural heterogeneity due to a different position of substitution of one of the four L-rhamnose residues in the main chain of the repeating unit as well as to the presence of oligosaccharide units with an incomplete side chain. |
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Keywords: | Pseudomonas syringae O-specific polysaccharide lipopolysaccharide 3-acetamido-3,6-dideoxy-D-galactose |
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