Location of the O-methyl groups in the O polysaccharide of Pseudomonas syringae pv. phaseolicola |
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Authors: | Zdorovenko E L Ovod V V Zatonsky G V Shashkov A S Kocharova N A Knirel Y A |
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Institution: | N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow. |
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Abstract: | The O-methylation pattern of the O polysaccharide (OPS) of the lipopolysaccharide of Pseudomonas syringae pv. phaseolicola GSPB 1552 was revealed by methylation (CD3I) analysis, Smith degradation, and NMR spectroscopy. Together with the major O repeats consisting of D-rhamnopyranose (D-Rhap) and D-fucofuranose (D-Fucf), there are minor repeats (approximately 30%) containing 3-O-methyl-D-rhamnose (D-acofriose), which is 2-substituted in the interior repeats and occupies the terminal non-reducing end of the OPS. It was suggested that the methylated O repeats are linked to each other nearby the non-reducing end of the OPS and that the 'biological' O repeat of the OPS has the following structure: molecular structure: see text]. |
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