Journal
BIOCHEMISTRY-MOSCOW
Volume 75, Issue 5, Pages 606-613Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S000629791005010X
Keywords
Azospirillum; capsular antigens; polysaccharide structure
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Funding
- Russian Foundation for Basic Research [08-04-00669]
- Grant Counsel of the Russian Federation President [NSh 3171.2008.4]
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Antigenic differences were revealed between the cell wall outer membrane lipopolysaccharides and the capsular high molecular weight bioglycans for a typical strain of the nitrogen-fixing rhizobacterium Azospirillum lipoferum Sp59b using antibodies prepared against the homologous lipopolysaccharide and lipopolysaccharide-protein complex. From the capsular lipopolysaccharide-protein and polysaccharide-lipid complexes of A. lipoferum Sp59b, polysaccharides were isolated and their structure was for the first time established in Azospirillum by monosaccharide analysis which included determination of the absolute configurations, methylation, O-deacetylation, and one- and two-dimensional NMR spectroscopy. The polysaccharides of the capsular complexes were shown to have identical structure of the branched tetrasaccharide repeating unit, which differs from the structure of the O-specific polysaccharide within the outer membrane lipopolysaccharide of this strain.
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