Thrombin-like snake venom serine protease that coagulates human plasma and bovine fibrinogen by hydrolysis of the alpha chains (FGA) (minimum coagulation dose is 120 ug on fibrinogen). Has fibrinogenolytic activities, and degrades preferentially the Aalpha chain (FGA). Shows amidolytic activity toward N-benzoyl-L-Arg-p-nitroanilide, has a lower activity than Cdc SII. In vivo, intravenous injection induces defibrin(ogen)ation and a loss of the righting reflex and opisthotoxins, together with a typical gyroxin-like effect (18-20 minutes). Subcutaneous injection into the footpads induces moderate edema. Potentiates local hemorrhagic activity induced by metalloproteinases (BaP1). Strongly inhibited by PMSF. Not inhibited by EDTA, aprotinin, pepstatin, leupeptin, and bestatin. Monomer. Expressed by the venom gland. Does not induce myotoxicity or hemorrhage, when injected intramuscularly. Is not lethal when administered either intravenously or intraperitoneally into mice (maximum dose tested is 20 ug) (PubMed:23178323). Belongs to the peptidase S1 family. Snake venom subfamily.