Purification of cross-reacting protein antigen shared by Yersinia enterocolitica and other gram-negative bacteria with monoclonal antibody.
A monoclonal antibody against the Yersinia enterocolitica 60-kilodalton (kDa) antigen, designated cross-reacting protein antigen (CRPA), was obtained by cell fusion. The CRPA common to gram-negative bacteria was purified from Y. enterocolitica by the affinity chromatography with the monoclonal antibody (IgG1) thus obtained. The purified CRPA showed a single band of 60 kDa in SDS-polyacrylamide gel electrophoresis (SDS-PAGE), and reacted with rabbit antisera against Y. enterocolitica, Vibrio cholerae, Escherichia coli, Pseudomonas aeruginosa, and Shigella sonnei in Western blot analysis. The monoclonal antibody, however, reacted with a 60 kDa peptide from Y. enterocolitica, but not with the antigens from other gram-negative bacteria such as V. cholerae, E. coli, S. sonnei, Salmonella enteritidis, Serratia marcescens, Klebsiella pneumoniae, Proteus mirabilis, and P. aeruginosa. The results suggested that both species-specific and cross-reactive epitopes were present on a CRPA molecule.
Department of Microbiology, Kyorin University School of Medicine, Tokyo.
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Yamaguchi
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Taguchi
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Katura
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Kumada
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Uekusa
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Ogata
D000818:Animals; D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial / Q000302:isolation & purification*; D001426:Bacterial Proteins / Q000302:isolation & purification*; D003429:Cross Reactions; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D006090:Gram-Negative Bacteria / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D015008:Yersinia enterocolitica / Q000276:immunology*
D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial; D001426:Bacterial Proteins