Lachesis muta venom serine protease (LmSVSP)

Lachesis muta venom serine proteases (LmSVSPs) are a critical class of enzymes found in the venom of the South American Bushmaster snake, Lachesis muta. These enzymes function primarily by disrupting the host's hemostatic system, frequently acting as thrombin-like enzymes that cleave fibrinogen into unstable fibrin clots. This activity leads to the rapid depletion of circulating fibrinogen, resulting in a clinical state of consumptive coagulopathy and severe systemic bleeding (Torres-Huaco et al., 2013). Beyond their toxicological role, LmSVSPs are studied for their potential therapeutic applications as defibrinogenating agents to treat or prevent thrombotic disorders. They are the primary targets for neutralization by specific and polyvalent antivenoms during the clinical management of snakebite (NCBI, 2023). Understanding the molecular structure and substrate specificity of these proteases is essential for improving antivenom efficacy and for the development of novel anticoagulants.

Other names

Bushmaster snake venom serine proteaseLachesis muta thrombin-like enzymeLm-TLEFibrinogenolytic enzymeGyroxin-like enzyme

LmSVSPs primarily act as thrombin-like enzymes that cleave fibrinogen (typically the alpha or beta chains) to produce fibrin monomers. Unlike physiological thrombin, these enzymes often do not activate Factor XIII, resulting in the formation of weak, non-cross-linked fibrin clots that are rapidly degraded by the body's fibrinolytic system, leading to systemic defibrinogenation and coagulopathy (Diniz-Sousa et al., 2020; UniProt P81131).