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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: 2291)
 
Grimmecke HD, Knirel YA, Shashkov AS, Kiesel B, Lauk W, Voges M
Structure of the capsular polysaccharide and the O-side-chain of the lipopolysaccharide from Acetobacter methanolicus MB 70, and of oligosaccharides resulting from their degradation by the bacteriophage Acm6
Carbohydrate Research 253 (1994) 277-282
 

Acetobacter methanolicus MB 70 was shown to be related to the type strain of this species MB 58/4 (IMET 10945) having the same galactan →2)-β-D-Galf-(1→3)-β-D-Galp-(1→ as the capsular polysaccharide (CPS) and the O-side-chain of the lipopolysaccharide (LPS). Additionally, a glucan built up of the disaccharide repeating unit →6)-α-D-Glcp-(1→2)-α-D-Glcp-(1→ was identified in strain MB 70. In the CPS, the polymers were present in the ratio approximately 1:1, whereas the glucan preponderated in the LPS. Bacteriophage Acm6 specific to A. methanolicus MB 70 hydrolysed selectively the glucan component of both CPS and LPS. Structural elucidation of the resulting oligosaccharides led to the identification of the phage-associated depolymerase as an endo-α-(1→6)-D-glucopyranoside hydrolase.

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