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1. (Article ID: 1778)
 
Knirel YA, Kochetkov NK
The structure of lipopolysaccharides of gram-negative bacteria. III. The structure of O-antigens: A review
Biochemistry (Moscow) 59(12) (1994) 1325-1383
 

This review summarizes data on the composition and structure of the O-antigens, the polysaccharide chains of the outer-membrane lipopolysaccharides (LPS) of Gram-negative bacteria defining the immunospecificity of these microbial cells. Special reference is given to some structural features of the O-antigens, such as the presence of unique monosaccharides and noncarbohydrate components, masked regularity, and the occurrence in one microorganism of LPS with structurally different polysaccharide chains. Antigenic relationships between microorganisms belonging to different taxonomic groups are discussed.

structure, O-antigen, chemical composition, bacterial lipopolysaccharides, Salmonella livingstone C1

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2. (Article ID: 1891)
 
Paramonov NA, Shashkov AS, Knirel YA, Soldatkina MA, Zakharova IY
Antigenic polysaccharides of bacteria. 39. Structure of O-specific polysaccharides of Pseudomonas cepacia serogroups C, I, O1 and O4
Bioorganicheskaya Khimia = Bioorganic Chemistry [Russian] 20(8-9) (1994) 984-993
 

Like some Pseudomonas cepacia serogroups studied earlier, serogroups C, I (Nakamura), O1 and O4 (Heidt) are characterized by the presence of at least two structurally different O-antigenic polysaccharide chains in cell-wall lipopolysaccharides. On the basis of acid hydrolysis, methylation, 1H- and 13C-NMR spectroscopy, including computer-assisted 13C-NMR-based analysis, the complete structures of the predominant polysaccharides of serogroups I (I), C and O4 (III) and the minor polysaccharides of serogroups I (II) and O1 (V) were established, and the structure of the predominant polysaccharide of serogroup O1 (IV) established earlier (Cox A. D., Wilkinson S. G.@Carbohydr. Res. 1990. V. 195. No 2. P. 295-301) was confirmed.

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