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1. (Article ID: 2844)
 
Ariza MA, Martin-Luengo F, Valero-Guillen PL
A family of diacyltrehaloses isolated from Mycobacterium fortuitum
Microbiology 140 (1994) 1989-1994
 

A trehalose-containing glycolipid was detected in several strains of Mycobacterium fortuitum and characterized as 2,3-di-O-acyltrehalose (DAT) by combined NMR spectroscopy, IR spectroscopy, GLC and GLC-MS. Lipid constituents of the molecule were identified as a mixture of straight-chain (14-18 carbon atoms) and methyl-branched-chain (17-21 carbon atoms) fatty acyl groups. DAT was further fractionated by reverse phase TLC into four fractions that were designated DAT-I-DAT-IV. DAT-I contained 70-75% straight-chain acyl substituents (hexadecanoyl and octadecanoyl predominating) and 25-30% 2-methyl branched substituents (mainly 2-methyl octadecadienoyl). DAT-II was composed of a mixture in which the acyl groups were almost exclusively 2-methyl branched, with 2-methyl octadecadienoyl and 2-methyl octadecen-2-oyl predominating. DAT-III, which was the major isolated fraction, consisted of compounds in which the ratio linear to branched acyl groups varied between 0.8 to 0.9, 2-methyl octadecen-2-oyl, hexadecanoyl and octadecanoyl being the most abundant. Finally, DAT-IV comprised a mixture of DAT molecules containing mostly 2-methyl octadecadienoyl, 2-methyl octadecen-2-oyl, 2-methyl eicosadienoyl and 2-methyl eicosen-2-oyl groups.

glycolipid, acyltrehalose, glycolipid Mycobacterium fortuitum, Mycobacterium fortuitum

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2. (Article ID: 2962)
 
Ratnayake S, Widmalm G, Weintraub A, Medina EC
Structural studies of the Escherichia coli O90 O-antigen polysaccharide
Carbohydrate Research 263 (1994) 209-215
 

The O-specific side-chain of the lipopolysaccharide from Escherichia coli O90 has been investigated using methylation analysis, partial hydrolysis, and NMR spectroscopy as the principal methods. It is concluded that the polysaccharide is composed of tetrasaccharide repeating-units having the following structure: [see text]. The polysaccharide contains approximately one mole of O-acetyl groups per repeating unit, located on the fucose residue.

Lipopolysaccharide, Escherichia coli, blood group antigen

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