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1. (Article ID: 4724)
 
Sigida EN, Fedorova EE, Zdorovenko EL, Burygin GL, Konnova SA, Ignatov VV
Characterization of the lipopolysaccharides of serogroup II Azospirillum strains
Mikrobiologiia = Microbiology [Russian] 83(4) (2014) 326-334
 

Lipopolysaccharides of six Azospirillum brasilense strains (SR50, SR80, SR88, SR109, SR111, SR115) and A. lipoferum SR 42 isolated from the rhizosphere of cereal plants of Saratov oblast, Russia and referred to serogroup II by serological analysis were studied. In the lipid A fatty acid composition, the lipopolysaccharides under study were similar to those of other Azospirillum strains and were characterized by a predominance of 3-hydroxytetradecanoic, 3-hydroxyhexadecanoic, and octadecenoic acids. Monosaccharide analysis of the O-specific polysaccharides (including determination of the absolute configurations, methylation analysis, and one- and two-dimensional NMR spectroscopy) revealed the presence of two types of repeating units in varying ratios. A high degree of serological similarity between the strains under study was shown to result from the presence of repeating units with identical structure of their O antigens.

lipopolysaccharides, Azospirillum, structure of the Ospecific polysaccharide, serological investigation

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2. (Article ID: 4844)
 
Fedonenko YP, Sigida EN, Konnova SA, Ignatov VV
Structure and serology of O-antigens of nitrogen-fixing rhizobacteria of the genus Azospirillum
Russian Chemical Bulletin = Izvestiia Akademii nauk. Seriia khimicheskaia 64(5) (2015) 1024-1031
 

The review presents a discussion of the published data of 2002 to 2014 dealing with structural studies of O-specific polysaccharides, representatives of the Azospirillum diazotrophic rhizobacteria, summarizing the results of a series of authors? studies. Some general structures incorporated in O-specific polysaccharides responsible for classification of bacterial cultures into serogroups on the basis of immunochemical studies were characterized. The structures of O-specific polysaccharides of seven azospirillum strains identical to those of previously studied strains are presented in this review for the first time.

lipopolysaccharides, O-specific polysaccharides, Structures, Azospirillum, O-antigenic determinants

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