Determination of the Structure of the Repeated Unit of the Azospirillum brasilense SR75 O-Specific Polysaccharide and Homology of the lps Loci in the Plasmids of Azospirillum brasilense strains SR75 and Sp245 |
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Authors: | Yu P Fedonenko I V Borisov O N Konnova E L Zdorovenko E I Katsy S A Konnova and V V Ignatov |
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Institution: | (1) Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, Russia;(2) Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia |
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Abstract: | The structural identity of the repeated unit in O-specific polysaccharides (OPSs) present in the outer membrane of strain
SR75 of the bacterium Azospirillum brasilense, isolated from wheat rhizosphere in Saratov oblast, and the previously studied OPSs of A. brasilense strain Sp245, isolated from surfacesterilized wheat roots in Brazil, has been demonstrated. Plasmid profiles, DNA restriction,
and hybridization assays suggested that A. brasilense strains SR75 and Sp245 have different genomic structures. It was shown that homologous lps loci of both strains were localized in their plasmid DNA. This fact allows us to state that, despite their different origin,
the development of the strains studied was convergent. Presumably, the habitation of these bacteria in similar ecological
niches influenced this process in many respects.
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Translated from Mikrobiologiya, Vol. 74, No. 5, 2005, pp. 626–632.
Original Russian Text Copyright ? 2005 by Fedonenko, Borisov, O. Konnova, Zdorovenko, Katsy, S. Konnova, Ignatov. |
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Keywords: | lipopolysaccharides structure of O-specific polysaccharides plasmids Azospirillum brasilense |
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