Zinc metalloproteinase that exhits a weak hemorrhagic activity. Degrades preferentially the Aalpha- (FGA) and Bbeta-chains (FGB) of fibrinogen, and partially degrades gamma-chain (FGG) at higher concentration. Induces a mild myotoxicity, but lacks coagulant activity on human plasma or bovin fibrinogen and defibrinating activity. Binds 1 zinc ion per subunit. Inhibited by EDTA, and o-phenanthroline, but not inhibited by PMSF, pepstatin A, and aprotinin. Monomer. Expressed by the venom gland. The N-terminus is blocked. Contains 3 disulfide bonds. Average mass. The minimal hemorrhagic dose is 0.85 mg/kg by intradermal injection into mice. Accounts for about 45% of venom proteins. Belongs to the venom metalloproteinase (M12B) family. P-I subfamily.