TAILIEUCHUNG - Báo cáo khoa học: Structural and serological studies on a new 4-deoxy-D-arabino-hexosecontaining O-specific polysaccharide from the lipopolysaccharide of Citrobacter braakii PCM 1531 (serogroup O6)

The O-specific polysaccharide ofCitrobacter braakiiPCM 1531 (serogroupO6) was isolated bymild acid hydrolysis of the lipopolysaccharide (LPS) and found to containD-fucose, L-rhamnose, 4-deoxy-D-arabino-hexose andO-acetyl groups in molar ratios 2 : 1 : 1 : 1. On the basis of methylation analysis and 1 Hand13 C NMR spectroscopy data, the structure of the branched tetrasaccharide repeating unit of theO-specific polysaccharidewas established. | Eur. J. Biochem. 270 2732-2738 2003 FEBS 2003 doi Structural and serological studies on a new 4-deoxy-D-arabino-hexose-containing O-specific polysaccharide from the lipopolysaccharide of Citrobacter braakii PCM 1531 serogroup O6 Ewa Katzenellenbogen1 Nina A. Kocharova2 George V. Zatonsky2 Danuta Witkowska1 Maria Bogulska1 Alexander S. Shashkov2 Andrzej Gamian1 and Yuriy A. Knirel2 1L. Hirszfeld Institute of Immunology and Experimental Therapy Polish Academy of Sciences Wroclaw Poland 2N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Moscow Russia The O-specific polysaccharide of Citrobacter braakii PCM 1531 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 H 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 PCM 1531 is not related serologically to other known 4-deoxy-D-arabino-hexose-containing LPS from Citrobacter PCM 1487 serogroup O5 or C. youngae PCM 1488 sero-group O36 . Two other strains of Citrobacter PCM 1504 and PCM 1505 which together with strain PCM 1531 have been classified in serogroup O6 were shown to be serologically distinct from strain PCM 1531 and should be reclassified into another serogroup. Keywords Citrobacter braakii lipopolysaccharide O-anti-gen structure serological specificity 4-deoxy-D-arabino-hexose. Certain strains of the genus Citrobacter often cause serious opportunistic infections. Most frequently these bacteria are the aetiological factor of enteric diseases but they are also associated with extraintestinal disorders among which the most significant are neonatal meningitis and brain abscesses 1 2 . On the basis of genetic studies the

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