Snake venom zinc metalloprotease that inhibits platelet aggregation by binding specifically to platelet glycoprotein VI (GP6) and platelet glycoprotein Ib alpha (GP1BA). It inhibits the interaction between collagen and platelet GP6 by cleaving GP6 (at '225-Glu-|-Ala-226' and '238-Val-|-Phe-239' bonds), and inhibits vWF-induced platelet aggregation by cleaving GP1BA and vWF. Cleavage of GP1BA occurs at two distinct sites to generate two soluble fragments. It also cleaves alpha- (FGA) and subsequently the gamma-chain (FGG) of fibrinogen, leaving the beta-chain unaffected. It also inhibits collagen-, convulxin- and ristocetin-induced platelet aggregation. It blocks the adhesion of platelet to immobilized collagen, but only exerts a slight inhibition to fibrinogen. In vivo, it exerts potent antithrombotic effect. Binds 1 zinc ion per subunit. Inhibited by EDTA, and O-phenanthrolene. Monomer. Expressed by the venom gland. Belongs to the venom metalloproteinase (M12B) family. P-I subfamily.