Zinc metalloprotease that preferentially degrades Aalpha chain of fibrinogen (FGA) (at a dose of 5 ug, whereas at a dose of 10 ug, both FGA and FGB are completely degraded). Degrades fibrin gel in a dose-dependent manner, as well blood clots formed in vitro (thrombolytic activity). Induces hemorrhage (in the dorsal skin of mice), with an MHD of 50 ug. The basal membrane components collagen (all chains of type IV) (COL4A4), fibronectin (FN1), laminin and nidogen are all degraded by this toxin. Binds 1 zinc ion per subunit. Inhibited by the chelating agents EDTA, EGTA and 1,10-phenanthroline. Is not inhibited by serine proteinase inhibitors aprotinin, leupeptin and benzamidine. Optimum pH is 6.0-10.5. Optimum temperature is 37 degrees Celsius. Monomer. Expressed by the venom gland. Is unable to promote plasma coagulation. Does not degrade gamma chain of fibrinogen (FGG) (PubMed:23385358). Belongs to the venom metalloproteinase (M12B) family. P-I subfamily.