Acting on peptide bonds (peptidases);
Fully activates human clotting factor V by a single cleavage at the Trp-Tyr-Leu-Arg1545!Ser-Asn-Asn-Gly bond. Cattle, but not rabbit, factor V is cleaved, and no other proteins of the clotting system are attacked. Esterase activity is observed on Bz-Arg-OEt and Tos-Arg-OMe, and amidase activity on Phe-pipecolyl-Arg-NHPhNO2
Known from venom of Vipera russelli. Inhibited by di-isopropyl fluorophosphate, unlike the metallopeptidase russellysin (EC 184.108.40.206) that is specific for factor X . In peptidase family S1 (trypsin family) .