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Carbohydr Res. 2011 Sep 27;346(13):1924-9. doi: 10.1016/j.carres.2011.05.014. Epub 2011 May 19.

Structures and genetics of Kdo-containing O-antigens of Cronobacter sakazakii G2706 and G2704, the reference strains of serotypes O5 and O6.

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N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.


Cronobacter sakazakii G2706 and G2704 are the reference strains of serotypes O5 and O6 in the serological classification of this species proposed recently. Mild acid degradation of the lipopolysaccharides of both strains resulted in cleavage of the O-polysaccharide chains at the acid-labile linkage of 3-deoxy-d-manno-oct-2-ulosonic acid (Kdo) to yield oligosaccharides representing repeating units of the O-polysaccharides. The oligosaccharides and alkali-degraded lipopolysaccharides were studied by sugar analysis along with 1D and 2D (1)H and (13)C NMR spectroscopy, and the following O-polysaccharide structures were established: The structure of strain G2706 is unique among the known bacterial polysaccharide structures, whereas that of strain G2704 is identical to the structure of Cronobacter malonaticus 3267 [MacLean, L. L.; Vinogradov, E.; Pagotto, F.; Farber, J. M.; Perry, M. B. Biochem. Cell Biol.2009, 87, 927-932], except for that the latter lacks O-acetylation. Putative functions of the genes in the O-antigen gene clusters of C. sakazakii strains studied are in agreement with the O-polysaccharide structures.

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