TAILIEUCHUNG - Báo cáo khoa học: Structure of the O-polysaccharide fromProteus myxofaciens Classification of the bacterium into a newProteusO-serogroup

The O-polysaccharide (O-antigen) was obtained from the lipopolysaccharide of Proteus myxofaciens,aProteus strain producing copious amounts of slime, which was isolated from the gypsy moth larvae. The structure of the polysaccharide was studied by chemical analysis and 1 H and 13 C NMR spectroscopy, including 2D COSY, TOCSY, ROESY and H-detected 1 H, 13 CHMQC experiments. | Eur. J. Biochem. 270 3182-3188 2003 FEBS 2003 doi Structure of the O-polysaccharide from Proteus myxofaciens Classification of the bacterium into a new Proteus O-serogroup Zygmunt Sidorczyk1 Anna N. Kondakova2 Krystyna Zych1 Sof ya N. Senchenkova2 Alexander S. Shashkov2 Dominika Drzewiecka1 and Yuriy A. Knirel2 1 Department of General Microbiology Institute of Microbiology and Immunology University of Lodz Poland . Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Moscow Russian Federation The O-polysaccharide O-antigen was obtained from the lipopolysaccharide of Proteus myxofaciens a Proteus strain producing copious amounts of slime which was isolated from the gypsy moth larvae. The structure of the polysaccharide was studied by chemical analysis and 1H and 13C NMR spectroscopy including 2D COSY TOCSY ROESY and H-detected 1H 13C HMQC experiments. It was found that the polysaccharide contains an amide of glucuronic acid GlcA with an unusual a-linked amino acid Ne- R -1-carboxyethyl -L-lysine 2S 8R-alaninolysine 2S 8R-AlaLys and has a linear tetrasaccharide repeating unit of the following structure 25 S2 -AlaLys This structure is unique among known bacterial polysaccharide structures. On the basis of these and serological data it is proposed that P. myxofaciens be classified into a new Proteus serogroup O60 of which this strain is the single representative. Structural and serological relatedness of P. myxofaciens to other AlaLys-containing O-antigens of Proteus and Providencia is discussed. Keywords lipopolysaccharide Ne- R -1-carboxyethyl -L-lysine O-polysaccharide O-serogroup Proteus myxo-faciens. - 4 -P-D-GlcM- l- 6 -a-D-GalpNAc- l- 6 -P-D-Glc NAc- l- 3 -P-D-GlcpNAc- l- Gram-negative bacteria of the genus Proteus from the family Enterobacteriaceae are divided into four species P. vulgaris P. mirabilis P. penneri and P. hauseri as well as three unnamed Proteus genomospecies 4 5 and 6 1 2 . They are widely .

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