Snake prothrombin activator that attacks the hemostatic system of prey. This protein is functionally similar to blood coagulation factor Xa (By similarity). Potent calcium-independent prothrombin activator, possesses high hemorrhagic activity along with metalloproteinase activity. Has considerably stronger activity than FXa. Binds divalent metal cations. Inhibited by EDTA, but not by PMSF. Activity is not dependent on the presence of calcium ions, phospholipids or FXa inhibitor. Monomer. Expressed by the venom gland. N-glycosylated. The molecular weight was determined to be 72 kDa with an isoelectric point of 6.67.