The O-antigenic polysaccharides of the lipopolysaccharides produced by three isolates of Pseudomonas cepacia serogroup A were analysed by composition, methylation, periodate oxidation, and two-dimensional nuclear magnetic resonance methods. They were found to be identical linear unbranched polymers of a repeating trisaccharide unit containing 2-acetamido-2-deoxy-D-galactose and L-rhamnose residues (2:1) and have the structure [-->3)-alpha-D-GalpNAc-(1-->3)-beta-D-GalpNAc-(1-->4)-alpha-L-Rhap -(1-->]n.
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Beynon et al. (1993) studied this question.
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