Abstract
A strain of Citrobacter sedlakii showing serological cross-reaction with Escherichia coli O157 antisera was demonstrated to produce a lipopolysaccharide O-antigen having an identical structure with that of the E. coli O157 O-antigen. A strain of Citrobacter freundii showing similar cross-reaction with E. coli O157 specific monoclonal antibody was shown to produce a lipopolysaccharide O-antigen composed of a trisaccharide repeating unit having the structure [–2)-α- D Rha p-(1–3)-β- D-Rha p-(1–4)-β- D-Glc p-(1–]. This O-antigen differs from that of the E. coli O157 O-antigen and also lacks a component 2-substituted 4-amino-4,6-dideoxy-α- D-mannopyranosyl residue implicated as the common epitope in the lipopolysaccharide O-antigens of previously investigated bacterial species showing serological cross-reactivity with E. coli O157 antisera. The C. freundii O-antigen presents an interesting example of structural mimicry within a bacterial polysaccharide antigen.
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