Daboia siamensis serine protease venom toxins (SVSPs)

Daboia siamensis serine protease venom toxins (SVSPs) are a group of enzymatic proteins found in the venom of the Eastern Russell's viper, a snake of significant medical importance in Southeast Asia. These toxins primarily act on the host's hemostatic system, functioning as procoagulants that trigger the blood clotting cascade. Key members include Factor V activators, such as RVV-V, and thrombin-like enzymes that directly cleave fibrinogen into fibrin. This enzymatic activity leads to the formation of weak, friable clots and the rapid depletion of essential clotting factors. The resulting condition, known as venom-induced consumption coagulopathy (VICC), causes systemic hemorrhage and can lead to fatal complications like acute kidney injury or pituitary infarction. Therapeutically, these toxins are the primary targets for specific monovalent and polyvalent antivenoms, which neutralize their proteolytic activity through antibody binding. Beyond their role in envenomation, SVSPs are studied as templates for the development of novel anticoagulant drugs and diagnostic reagents for coagulation disorders. Effective management of envenomation requires early administration of antivenom to prevent the irreversible consumption of coagulation factors.

Other names

Snake venom serine proteasesSVSPsRussell's viper venom serine proteasesRVV-VFactor V activatorRVAFRVBFThrombin-like enzymes

Neutralization of enzymatic activity through antibody binding