Amino acid sequence of a snake venom toxin that binds to the muscarinic acetylcholine receptor.

The green mamba, Dendroaspis angusticeps, has two protein toxins that bind to the muscarinic acetylcholine receptor. The sequence of muscarinic toxin 2 was determined with an automatic gas phase sequencer. The C-terminal residue is Asp as determined by hydrazinolysis and amino acid analysis. Toxin 2 has 65 amino acid residues and a formula weight of 7040. It is homologous to a large number of other snake venom toxins as short alpha-neurotoxins, cardiotoxins/cytotoxins and angusticeps-type toxins of mamba venoms. The sequence is confirmed in the accompanying article (Ducancel, F., Rowan, E.G., Cassart, E., Harvey, A. L., Menez, A. and Boulain, J.-C. Toxicon 29, 516-520, 1991).