Structure of the O-polysaccharide of Cronobacter sakazakii O2 with a randomly O-acetylated l-rhamnose residue

Studies by sugar analysis and partial acid hydrolysis along with one- and two-dimensional 1H and 13C NMR spectroscopy and high-resolution ESI MS showed that the O-polysaccharide (O-antigen) Cronobacter sakazakii ATCC 29004 (serotype O2) possesses a branched hexasaccharide O-unit with a randomly mono-O-acetylated terminal rhamnose residue in the side chain and the following structure:A similar structure has been reported for the O-polysaccharide of C. sakazakii 767, which differs in the presence of an additional lateral α-d-Glcp residue on GlcNAc and the pattern of O-acetylation (Czerwicka, M., Forsythe, S. J.; Bychowska, A.; Dziadziuszko, H.; Kunikowska, D.; Stepnowski, P.; Kaczynski, Z. Carbohydr. Res.2010, 345, 908–913).

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