Snake venom serine protease that induces platelet aggregation through activation of protease-activated platelet receptors (PAR1/F2R and PAR4/F2RL3). On F2R, the cleavage occurs at Arg41-Ser42 (like thrombin cleavage), and Arg46-Asn47. In normal condition of hemostasis, the cleavage of the Arg41-Ser42 bond liberates a new N-terminus that functions as an agonist. However after envenomation, the cleavage of Arg46-Asn47 bond degrades this potential agonist. This may explain why the snake protease is less potent than thrombin in causing platelet aggregation and release reaction. On F2RL3, a thrombin-like activity has also been proven by calcium release from lung fibroblasts transfected with this receptor. Possesses amidolytic activities. Inhibited by PMSF. The amidolytic activity is also inhibited by benzamidine derivatives. Monomer. Expressed by the venom gland. This protein seems to be found in both adult and newborn B.jararaca venoms. Does not have fibrinogen-clotting activity. Belongs to the peptidase S1 family. Snake venom subfamily.