Bitis arietans snake venom serine protease (BaSVSP)

Bitis arietans snake venom serine protease (BaSVSP) refers to a group of enzymes found in the venom of the Puff adder, a medically significant viper in Africa. These enzymes primarily disrupt the host hemostatic system by targeting the coagulation cascade, particularly through thrombin-like or fibrinogenolytic activities (PMID: 17467233). By cleaving fibrinogen, BaSVSPs can induce the formation of unstable fibrin clots or lead to the total depletion of fibrinogen, resulting in consumptive coagulopathy and severe systemic hemorrhage (PMID: 30145354). Structurally, these proteases belong to the S1 family of peptidases and utilize a conserved catalytic triad consisting of histidine, aspartate, and serine to perform their proteolytic functions. In a clinical context, BaSVSPs are the primary targets for neutralization by polyvalent antivenoms, such as the SAIMR polyvalent antivenom, which contains antibodies that bind and inactivate these toxins (PMID: 25448304). Furthermore, research into small-molecule inhibitors like nafamostat mesylate has demonstrated their potential as adjunct treatments to inhibit SVSP activity and delay the onset of systemic envenomation effects (PMID: 33035560). Their high specificity for coagulation factors also makes them valuable in diagnostic hematology and as templates for developing novel anticoagulant therapies.

Other names

Puff adder venom serine proteaseBitis arietans SVSPBitis arietans thrombin-like enzymeBitis arietans fibrinogenolytic enzyme

Antivenoms utilize polyclonal antibodies to bind and neutralize the enzymatic activity of the proteases, while small-molecule inhibitors like nafamostat act as competitive inhibitors of the serine protease catalytic triad.