title: Serological cross-reaction between the lipopolysaccharide O-polysaccharaide antigens of Escherichia coli O157:H7 and strains of Citrobcter freundii and Citrobacter sedlakii.
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 freunndii 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)-alpha-D Rhap-(1-3)-beta-D-Rhap-(1-4)-beta-D-Glcp-(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-alpha-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.
authors.affiliation: Institute for Biological Sciences, National Research Council, Ottawa, Ont., Canada.
authors.forename: E
authors.initials: E
authors.lastname: Vinogradov
authors.forename: J W
authors.initials: JW
authors.lastname: Conlan
authors.forename: M B
authors.initials: MB
authors.lastname: Perry
mesh_terms: D000372:Agglutination Tests; D000907:Antibodies, Bacterial / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D002240:Carbohydrate Sequence; D002954:Citrobacter / Q000276:immunology*; D016971:Citrobacter freundii / Q000276:immunology; D003429:Cross Reactions; D004544:El Salvador; D019453:Escherichia coli O157 / Q000276:immunology*; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D019081:O Antigens / Q000737:chemistry / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000911:Antibodies, Monoclonal; D019081:O Antigens