Abstract
Fast atom bombardment (FAB) mass spectrometry was used to identify a new small myotoxin from the venom of the prairie rattlesnake ( Crotalus viridis viridis). FAB mass spectrometry and Edman degradation were used to characterize its structure. This toxin is similar to myotoxin I from C. v. concolor. except that it possesses an additional C-terminal asparaginyl-alanine. At 45 residues it is the longest known myotoxin a homolog. A myotoxin of 43 residues, identical to myotoxin I from C. v. concolor, was also found. To date no other species has been shown to produce more than one length of myotoxin. The present paper documents 42-, 43-, and 45-residue myotoxins from the venom of a single animal.
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