Daboia siamensis venom serine protease (DsSVSP)

Daboia siamensis venom serine proteases (SVSPs) are a major family of enzymatic toxins found in the venom of the Eastern Russell's viper, a medically significant species in Southeast Asia and parts of East Asia. These enzymes primarily disrupt the host's hemostatic system by mimicking or activating key components of the coagulation cascade. The most prominent member, Factor V activator (RVV-V), specifically cleaves and activates coagulation Factor V, leading to rapid, uncontrolled thrombin generation. Other SVSPs include thrombin-like enzymes and fibrinogenases that directly degrade fibrinogen, resulting in the formation of unstable fibrin clots and the depletion of clotting factors. This process culminates in venom-induced consumptive coagulopathy (VICC), a life-threatening condition characterized by systemic hemorrhage and potential organ failure, such as acute kidney injury. In a clinical setting, these proteases are the primary targets for neutralization by specific monovalent and polyvalent antivenoms, which bind to the toxins and inhibit their enzymatic activity. Beyond their role in envenomation, SVSPs are studied as biochemical tools and templates for developing novel anticoagulant and procoagulant therapeutics due to their high substrate specificity.

Other names

Eastern Russell's viper venom serine proteaseSnake venom serine proteaseRussell's viper venom serine proteinaseRVV-VFactor V activatorThrombin-like enzymeFibrinogenase

Neutralization of enzymatic activity through antibody-mediated binding, which prevents the activation of coagulation factors (such as Factor V) and the degradation of fibrinogen, thereby halting the progression of consumptive coagulopathy.