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1. (Article ID: 691)
 
Haseley SR, Holst O, Brade H
Structural studies of the O-antigen isolated from the phenol- soluble lipopolysaccharide of Acinetobacter baumannii (DNA group 2) strain 9
European Journal of Biochemistry 251(1-2) (1998) 189-194
 

A polysaccharide containing D-GalNAc, D-Glc and 4-acetamido-4,6-dideoxy-D-glucose (Qui4NAc) was isolated from the phenol-soluble lipopolysaccharide originating from Acinetobacter baumannii strain 9. The structure of the repeating unit was shown by means of monosaccharide analyses, Smith-degradation, partial acid hydrolysis, mass spectrometry, and NMR spectroscopy to be a branched pentasaccharide, in which the tetrasaccharide backbone is built from amino sugars only.[formula: see text].The polysaccharide was identified by serological and western blot analyses as the O-antigen of the lipopolysaccharide.

Lipopolysaccharide, LPS, DNA, strain, structural, O-antigen, O antigen, group, Acinetobacter, Acinetobacter baumannii, structural studies, phenol soluble, Phenol, soluble

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2. (Article ID: 4329)
 
Knirel YA
Structure of O-antigens
Book: Bacterial lipopolysaccharides: Structure, chemical synthesis, biogenesis and interaction with host cells (2011) Chapter 3, 41-115
 

The lipopolysaccharide (LPS) is the major constituent of the outer leaflet of the outer membrane of Gram-negative bacteria. Its lipid A moiety is embedded in the membrane and serves as an anchor for the rest of the LPS molecule. The outermost repetitive glycan region of the LPS is linked to the lipid A through a core oligosaccharide (OS), and is designated as the O-specific polysaccharide (O-polysaccharide, OPS) or O-antigen. The O-antigen is the most variable portion of the LPS and provides serological specificity, which is used for bacterial serotyping. The OPS also provides protection to the microorganisms from host defenses such as complement mediated killing and phagocytosis, and is involved in interactions of bacteria with plants and bacteriophages. Studies of the OPSs ranging from the elucidation of their chemical structures and conformations to their biological and physico-chemical properties help improving classification schemes of Gram-negative bacteria. Furthermore, these studies contributed to a better understanding of the mechanisms of pathogenesis of infectious diseases, as well as provided information to develop novel vaccines and diagnostic reagents.

Lipopolysaccharide, synthesis, lipopolysaccharides, structure, Bacterial, host, O-antigen, O antigen, cell, O antigens, O-antigens, chemical, interaction, cells, PDF, chemical synthesis, biogenesis

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3. (Article ID: 4819)
 
Giguere D
Surface polysaccharides from Acinetobacter baumannii: Structures and syntheses
Carbohydrate Research 418 (2015) 29-43
 

The emergence of multidrug-resistance Acinetobacter baumannii requires novel approaches for prevention, treatment and diagnosis. The structures of surface polysaccharides from A. baumannii are valuable tools to understand pathogenesis, virulence and immunogenicity. The synthesis of bacterial mono- or polysaccharides may result in novel probes to become important therapeutic options in the fight against A. baumannii. This report exemplifies the relevance of glycochemistry for the development of new antibiotics.

lipopolysaccharides, capsular polysaccharides, Acinetobacter, Acinetobacter baumannii, polysaccharide synthesis, surface polysaccharides

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