Structures of the O-specific polymers from the lipopolysaccharides of the reference strains for Pseudomonas cepacia serogroups O3 and O5.

The putative O-specific polymers of lipopolysaccharides from two reference strains of Pseudomonas cepacia have been isolated and characterized. Both polymers have disaccharide repeating-units. Structure 1 was established for the O3 polymer, and structure 2 for the O5 polymer. Polymers with the same repeating units have been found previously as the O antigens of other bacteria. ----2)-beta-D-Ribf-(1----4)-alpha-D-GalpNAc-(1---- ----4)-alpha-L-Rhap-(1----3)-beta-D-ManpNAc-(1----