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1. (Article ID: 1095)
 
Perepelov AV, Shashkov AS, Senchenkova SN, Knirel YA, Literacka E, Kaca W
Structure of the O-specific polysaccharide of the bacterium Proteus mirabilis O29
Biochemistry (Moscow) 65(2) (2000) 176-179
 

An O-specific polysaccharide was obtained by mild acid degradation of P. mirabilis O29 lipopolysaccharide (LPS) and found to contain 2-acetamido-2-deoxy-D-galactose and D-glucuronic acid (D-GlcA) in the ratio 3:1. Studies fo the polysaccharide by 1H- and 13C NMR spectroscopy including two-dimensional correlation spectroscopy (COSY), total correlation spectroscopy (TOCSY), nuclear Overhauser effect spectroscopy (NOESY), and H-detected 1H,13C-heteronuclear multiple-quantum coherence (HMQC) experiments demonstrated the following structure of the branched tetrasaccharide repeating unit: (see formula in text).

Lipopolysaccharide, LPS, structure, strain, structural, characterization, polysaccharide, O-antigen, bacteria, O-specific, O-specific polysaccharide, Proteus, Proteus mirabilis, serological, chemical, immunochemical

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2. (Article ID: 2259)
 
Holst O, Brade H
Isolation and structural analysis of the tetrasaccharide 3-deoxy-5-O-[3-O-(3-O-a-D-glucopyranosyl-L-glycero-a-D-manno-heptopyranosyl)-L-glycero-a-D-manno-heptopyranosyl]-D-manno-octulosonic acid from the core region of the lipopolysaccharide of Salmonella minnesota strain R5 (rough mutant chemotype RcP-)
Carbohydrate Research 245 (1993) 159-163
 

No abstract available

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3. (Article ID: 2260)
 
Kovác P
Synthesis of ligands related to the O-specific antigen of Shigella dysenteriae type 1. Part 5. di and tri-saccharide glycosyl donors for the synthesis of fragments of the O-specific antigen of Shigella dysenteriae type 1
Carbohydrate Research 245 (1993) 219-231
 

Methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-l-rhamnopyranosyl)-(1 → 3)-2,4-di-O-benzoyl-α-l-rhamnopyranoside was treated with dichloromethyl methyl ether and ZnCl2 to give O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-l-rhamnopyranosyl)-(1 → 3)-2,4-di-O-benzoyl-α-l-rhamnopyranosyl chloride. Similar treatment of methyl O-(3,4-,6-tri-O-acetyl-2-azido-2-deoxy-α-d-glycopyranosyl)-(1 → →3)-2,4-di-O-benzoyl-α-l-rhamnopyranoside (13) gave crystalline O-(3,4,6-tri-O-acetyl-2-azido-2-deoxy-α-d-glucopyranosyl)-(1 → 3)-2,4-di-O-benzoyl-α-l-rhamnopyranosyl chloride (14), which was also obtained by treatment of methyl O-(3,4,6-tri-O-acetyl-2-azido-2-deoxoy-α-d-glucopyranosyl)-(1 → 3)-2,4-di-O-benzoyl-1-thio-α,l-rhamnopyranoside (12) with chlorine. In contrast to the conversion 12 → 14, which was stereospecific, the reaction of methyl O-(3,4,6-tri-O-acetyl-2-azido-2-deoxy-α-d-glucopyranosyl)-(1 → 3)-(O-2,4-di-O-benzoyl-α-l-rhamnopyranosyl)-(1 → 3)-2,4-di-O-benzoyl-1-thio-α-l-rhamnopyranoside with chlorine gave a mixture of the corresponding α-(16) and β-(17) glycosyl chlorides. Condensation of the mixed chlorides 16 and 17 with 1,3,4,6-tetra-O-acetyl-α-d-galactopyranose, followed by reduction-acetylation of the product, gave a fully protected derivative of the tetrasaccharide α-d-Glcp NAc-(1 → 3)-α-l-Rhap-(1 → 3)-α-l-Rhap-(1 → 2)-α-d-Galp.

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4. (Article ID: 2261)
 
Gray JSS, Brand JM, Koerner TAW, Montgomery R
Structure of an extracellular polysaccharide produced by Erwinia chrysanthemi
Carbohydrate Research 245 (1993) 271-287
 

Erwinia chrysanthemi pv zeae strain SR260, a phytopathogen of corn, produced from lactose an acidic extracellular polysaccharide which was purified and found to consist of L-rhamnose, D-mannose, D-glucose, and D-glucuronic acid in the ratio of 3:1:1:1. A combination of chemical (carboxyl-group reduction, methylation analysis, periodate oxidation, Smith degradation, and lithium-ethylenediamine degradation) and physical (1 and 2D NMR spectroscopy) methods revealed that the polysaccharide is composed of a hexasaccharide repeating unit 1: [formula: see text]

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