title: Immunity to heat-labile enterotoxins of porcine and human Escherichia coli strains achieved with synthetic cholera toxin peptides.
abstract: Antiserum to a synthetic peptide, CTP3, consisting of residues 50 to 64 of the B subunit of cholera enterotoxin (CT), a sequence which is conserved in heat-labile enterotoxins from Escherichia coli strains of human (H-LT) or porcine (P-LT) origin, cross-reacted with and neutralized all three enterotoxins. It also cross-reacted with genetically engineered chimeric B subunit proteins in which H-LT amino acids had been substituted for the corresponding residues in P-LT. Antisera against another CT peptide, CTP1, consisting of residues 8 to 20, were weakly cross-reactive with H-LT but not with P-LT, whereas antisera against four other CT peptides were not cross-reactive with the heterologous enterotoxins. A single dose of CTP3-linked tetanus toxoid, by itself nonimmunogenic, primed rabbits to a vigorous immune response to subsequent administration of single, small, subimmunizing doses of any of the three enterotoxins.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000992:Antitoxins / Q000096:biosynthesis; D001427:Bacterial Toxins / Q000276:immunology*; D002772:Cholera Toxin / Q000276:immunology*; D003429:Cross Reactions; D000242:Cyclic AMP / Q000096:biosynthesis; D004768:Enterotoxins / Q000276:immunology*; D004926:Escherichia coli / Q000276:immunology*; D029968:Escherichia coli Proteins; D006801:Humans; D007115:Immunization Schedule; D046911:Macromolecular Substances; D009842:Oligopeptides / Q000138:chemical synthesis / Q000276:immunology; D013552:Swine / Q000382:microbiology
chemical_list: D000907:Antibodies, Bacterial; D000992:Antitoxins; D001427:Bacterial Toxins; D004768:Enterotoxins; D029968:Escherichia coli Proteins; D046911:Macromolecular Substances; D009842:Oligopeptides; D002772:Cholera Toxin; C027538:heat-labile enterotoxin, E coli; D000242:Cyclic AMP