Metalloprotease that is highly active against alpha-(FGA) and beta-chains (FGB) of fibrinogen molecules. Binds 1 zinc ion per subunit. Inhibited by EDTA, beta-mercaptoethanol, but not by PMSF, p-tosyl-L-phenylalanine chloromethyl ketone, p-tosyl-L-lysine chloromethyl ketone, soybean trypsin inhibitor and aprotinin. Monomer. Expressed by the venom gland. Acidic protein of about 24 kDa. Belongs to the venom metalloproteinase (M12B) family.