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1. (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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2. (Article ID: 5498)
 
Sigida EN, Fedonenko YP, Shashkov AS, Toukach PV, Shelud'ko AV, Zdorovenko EL, Knirel YA, Konnova SA
Structural studies of O-specific polysaccharide(s) and biological activity toward plants of the lipopolysaccharide from Azospirillum brasilense SR8
International Journal of Biological Macromolecules 126 (2019) 246-253
 

Lipopolysaccharide (LPS) was extracted from dry bacterial cells of plant-growth-promoting bacterium Azospirillum brasilense SR8 (IBPPM 5). The O-specific polysaccharide (OPS) was obtained by mild acid hydrolysis of the lipopolysaccharide and studied by sugar analysis, 1H and 13C NMR spectroscopy, including 1H,1H COSY, TOCSY, ROESY, and 1H,13C HSQC and HMBC experiments, computational NMR-based structure analysis, and Smith degradation. The OPS was shown to contain two types of repeating units of the following structure: Both OPS structures are present in A. brasilense 54, from which structure 1 has been reported earlier (Fedonenko et al., 2011), whereas to our knowledge structure 2 has not been hitherto found in bacterial saccharides. Treatment of wheat seedling roots with LPS of A. brasilense SR8 increased the number of root hair deformations as compared to seedlings grown without LPS, but had no effect on adsorption of the bacteria to the root surface. A. brasilense SR8 was able to utilize LPS of several structurally related Azospirillum strains.

Lipopolysaccharide, structure, O-specific polysaccharide, Azospirillum brasilense, Chemotaxis, NMR simulation, Root hair deformation

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