Snake venom serine protease (SVSP)

Snake venom serine proteases (SVSPs) are a major class of enzymatic toxins found predominantly in the venom of vipers (Viperidae) [1.2.1, 1.4.1]. These enzymes are structurally homologous to chymotrypsin-like serine proteases and typically function by mimicking or disrupting the human hemostatic system [1.2.1, 1.2.2]. SVSPs act on various components of the blood coagulation cascade, including fibrinogen, prothrombin, and factors V and X [1.2.1, 1.4.2]. Their activity often leads to rapid clot formation or, more commonly, consumption coagulopathy and hemorrhage in snakebite victims [1.3.2, 1.3.3]. In the context of envenomation, they are critical therapeutic targets for antivenoms and emerging small-molecule inhibitors like nafamostat [1.3.1, 1.3.5]. Beyond their toxic roles, specific SVSPs have been isolated and developed into therapeutic agents, such as batroxobin and ancrod, used to treat thrombotic disorders [1.2.1, 1.4.3]. Their high specificity and resistance to endogenous inhibitors make them both potent toxins and valuable tools in hematological research [1.2.1, 1.4.3]. They are also used in clinical diagnostics to assess blood clotting irregularities [1.2.1, 1.4.3].

Other names

Viper venom serine proteaseSnake venom serine proteinaseThrombin-like enzymeTLEFibrinogenolytic enzymeProcoagulant serine proteaseKallikrein-like enzyme

SVSP inhibitors, such as nafamostat, act by binding to the active site of the enzyme, specifically targeting the canonical catalytic triad (His-Asp-Ser), thereby preventing the proteolysis of fibrinogen and the activation of coagulation factors [1.3.1, 1.3.5].