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- W2105110688 abstract "Checkerboard immunoblotting, a versatile new technique for examining multiple antigen and antibody interactions simultaneously, was applied in studies of epitopes in the cholera enterotoxin (CT)-related heat-labile enterotoxin (LT) family. The purified antigens used included the following: the B-subunit proteins from two CTs (CT-B-1 and CT-B-2), from classical and El Tor biotype strains of Vibrio cholerae, respectively; human LT-B-1 (H-LT-B-1) and porcine LT-B (P-LT-B) derived from LTs produced by Escherichia coli strains of human (H) and porcine (P) origins, respectively; and genetically engineered chimeric P-LT-Bs with amino acid substitutions from H-LT-B-1. The antigens were used in native, partially denatured, and CNBr-fragmented forms. The antisera included a variety of mouse monoclonal antibodies against these proteins as well as polyclonal hyperimmune sera and sera from adult American volunteer vaccinees or convalescents from induced cholera. Rabbit antisera against synthetic peptides of the CT-B-1 subunit were also used. In some instances, the effect of GM1 ganglioside on antibody binding was evaluated. The reactivity of the monoclonal antibodies was directed primarily against conformational epitopes: some were specific for homologous antigen; some were promiscuously reactive; and some recognized particular related proteins. Individual amino acids (most notably amino acid 46) exerted a dominant effect on epitope formation--in some instances, in a complementary fashion. Epitope expression was also affected by distant amino acid residues (polar effects). Some reactions were blocked by GM1 treatment of the immobilized antigen, indicating that the epitope was involved in or affected by GM1 binding. Polyclonal antibody responses varied within and among animal species. Human serum antitoxic responses were higher in convalescents from induced cholera than in recipients of a genetically engineered live vaccine, and the convalescent sera (from El Tor biotype cholera patients) generally preferred CT-B-2 to CT-B-1. The results demonstrate the potential significance of the differences among these immunologically related enterotoxins and may help provide direction to further vaccine development." @default.
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- W2105110688 date "1990-07-01" @default.
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- W2105110688 title "Study of epitopes of cholera enterotoxin-related enterotoxins by checkerboard immunoblotting" @default.
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- W2105110688 doi "https://doi.org/10.1128/iai.58.7.2352-2360.1990" @default.
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