Abstract
Two classes of paralytic toxins were isolated from the venom of Agelenopsis aperta and their chemical and larvicidal properties characterized. Five acylpolyamine toxins (alpha-agatoxins) of molecular masses 452, 488, 489, 504, and 505 Da produce immediate but reversible paralysis in Manduca sexta following injection. Six insecticidal peptides (mu-agatoxins) produce a gradual but irreversible paralysis. The complete amino acid sequences (36-38 residues) of the mu-agatoxins are presented. These peptides contain eight half-cystines and are quite similar in sequence. At least four of these toxins are amidated at the carboxyl terminus. The secondary structure of one of these toxins (mu-Aga V) was investigated.
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