Snake venom serine protease that has fibrinogenolytic activities. Also possess esterolysis and amidolytic activities. Selectively cleaves Arg-|-Xaa bonds. Inhibited by NPGB, leupeptin, aprotinin and PMSF, but not by EDTA, SBTI, heparin and hirudin. AaV-SP-II. Monomer. Expressed by the venom gland. Belongs to the peptidase S1 family. Snake venom subfamily. AaV-SP-I is sequenced from 25-48 and its carbohydrate contents is 9%, whereas AaV-SP-II is sequenced from 25-64 and its carbohydrate contents is 4%.