Abstract
Botulism due to food poisoning is caused mainly by protein toxins, botulinum neurotoxins (BoNTs), produced by Clostridium botluinum in seven known immunological serotypes. These are the most potent toxins and poisons known. BoNT effects blockade of neuromuscular transmission by preventing neurotransmitter release. Human botulism is most frequently caused by types A, B, and E. Recent studies have shown that immunization with a 43-kDa C-terminal fragment (Hc, residues 860-1296) of BoNT/A affords excellent protection against BoNT/A poisoning. We raised antibodies (Abs) against BoNT/A in horse, and against pentavalent toxoid (BoNTs A, B, C, D, E) in human volunteers and outbred mice. Thirty-one 19-residue peptides that started at residue 855, overlapped consecutively by 5 residues, and encompassed the entire length of the Hc of BoNT/A were synthesized and used for mapping the Ab-binding regions recognized by the anti-BoNT/A antisera. Horse Abs against BoBT/A were bound by peptides 855-873, 939-957, 1079-1097/1093-1111 overlap, 1191-1209/1205-1223 overlap, 1261-1279 and 1275-1296. In addition, peptides 883-901, 911-929, 995-1013, 1023-1041/1037-1055 overlap, 1121-1139, and 1149-1167 gave low, but significant and reproducible, bindin...Continue Reading
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