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Common antigenic determinant in the receptor binding sites of Escherichia coli enterotoxin and cholera toxin |
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| Authors: | Takao Tsuji Akihiro Ogawa Takashi Miyata Tatsuya Iida Takeshi Honda Toshio Miwatani |
| Affiliation: | Department of Bacteriology and Serology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565, Japan;Faculty of Science, Kyushu University, 33 Higashi-ku, Fukuoka, Fukuoka 812, Japan |
| Abstract: | Abstract A mutant (TUH No. 9) of a porcine strain of enterotoxigenic Escherichia coli (ETEC) produces as abnormal B subunit (B') of heat-labile enterotoxin (LT), which has aspartate instead of glycine at residue 33 from the N-terminus and does not bind to the receptor, GM1 ganglioside. The antigenicities of the receptor-binding site of LT were analyzed. The antibody, which could not bind to the B' subunit in the anti-B subunit of porcine LT(LTp)-serum, could bind to cholera toxin (CT), LTp and LT produced by a human ETEC strain (LTh), suggesting that it recognizes a common epitope of LTp, LTh and CT. Thus glycine at residue 33 from the N-terminus in the B subunit of CT, LTh and LTp may be related to the common epitope of these three toxins. The bindings of CT, LTh and LTp to the antibody were inhibited by the GM1 ganglioside. These data indicate that the antibody recognizes a common epitope in the receptor (GM1 ganglioside)-binding site of CT, LTh and LTp. |
| Keywords: | Escherichia coli cholera toxin heat-labile enterotoxin GM1 ganglioside common antigenic determinant |
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