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1. (Article ID: 732)
 
Katzenellenbogen E, Zatonsky GV, Kocharova NA, Bogulska M, Korzeniowska-Kowal A, Shashkov AS, Gamian A, Knirel YA
Structure of a new 2-deoxy-2-[(R)-3-hydroxybutyramido]-D-glucose-containing O-specific polysaccharide from the lipopolysaccharide of Citrobacter gillenii PCM1542
Carbohydrate Research 337(17) (2002) 1541-1546
 

The O-specific polysaccharide of Citrobacter gillenii PCM1542 from serotype O-12a,12 b is composed of one residue each of D-glucose, D-GlcNAc, 2-deoxy-2-[(R)-3-hydroxybutyramido]-D-glucose (D-GlcNAcyl) and two GalNAc residues. On the basis of sugar and methylation analyses of the intact and Smith degraded polysaccharides, along with 1D and 2D 1H and 13C NMR spectroscopy, the following structure of the branched pentasaccharide repeating unit of the O-specific polysaccharide was established:This structure differs significantly from that of the O-specific polysaccharide of C. gillenii PCM1544 from the same serotype O-12a,12 b, which has been established earlier (Kuebler-Kielz.shtsls;b, J. et al. Carbohydr. Res. 2001, 331, 331-336). Serological studies confirmed that the two O-antigens are not related and suggested that strains PCM1542 and 1544 should be classified into different O-serogroups.

Lipopolysaccharide, structure, Bacterial, polysaccharide, O-antigen, O-specific, O-specific polysaccharide, serological classification, enterobacteria, 13C NMR, Citrobacter, 1H NMR, Citrobacter gillenti

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2. (Article ID: 733)
 
Katzenellenbogen E, Zatonsky GV, Kocharova NA, Witkowska D, Bogulska M, Shashkov AS, Gamian A, Knirel YA
Structural and serological studies on a new 4-deoxy-D-arabino-hexose-containing O-specific polysaccharide from the lipopolysaccharide of Citrobacter braakii PCM1531 (serogroup O6)
European Journal of Biochemistry 270(13) (2003) 2732-2738
 

The O-specific polysaccharide of Citrobacter braakii PCM1531 (serogroup O6) was isolated by mild acid hydrolysis of the lipopolysaccharide (LPS) and found to contain d-fucose, l-rhamnose, 4-deoxy-d-arabino-hexose and O-acetyl groups in molar ratios 2 : 1 : 1 : 1. On the basis of methylation analysis and 1H and 13C NMR spectroscopy data, the structure of the branched tetrasaccharide repeating unit of the O-specific polysaccharide was established. Using various serological assays, it was demonstrated that the LPS of strain PCM1531 is not related serologically to other known 4-deoxy-d-arabino-hexose-containing LPS from Citrobacter PCM1487 (serogroup O5) or C. youngae PCM1488 (serogroup O36). Two other strains of Citrobacter, PCM1504 and PCM1505, which, together with strain PCM1531, have been classified in serogroup O6, were shown to be serologically distinct from strain PCM1531 and should be reclassified into another serogroup.

Lipopolysaccharide, structure, structural, polysaccharide, O-specific, O-specific polysaccharide, serological, serogroup, serological specificity, O-antigen structure, Citrobacter, Citrobacter braakii, 4-deoxy-D-arabino-hexose

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