Daboia siamensis venom metalloproteinase (DsSVMP)

Daboia siamensis venom metalloproteinases (DsSVMPs) are a diverse group of zinc-dependent enzymes that constitute a major toxic component of the Eastern Russell's viper venom (UniProt, 2023). These enzymes are classified into different groups, primarily P-I and P-III, based on their domain structure, which includes metalloproteinase, disintegrin-like, and cysteine-rich domains (PubMed, PMID: 28235531). Their primary biological role in envenomation is the degradation of the extracellular matrix, specifically targeting the basement membrane of vascular endothelial cells, which results in profuse local and systemic hemorrhage (PubMed, PMID: 30145355). Furthermore, certain DsSVMPs act as potent procoagulants by activating Factor X or prothrombin, leading to venom-induced consumption coagulopathy (VICC) and potentially fatal bleeding (NIH, 2022). In the context of drug development, DsSVMPs are targeted by small-molecule inhibitors such as batimastat and marimastat, which bind the catalytic zinc ion, as well as metal chelators like unithiol (DMPS) (PubMed, PMID: 32824330). These therapeutic strategies aim to supplement traditional antivenom therapy, which can sometimes struggle to neutralize the rapid tissue-damaging effects of these enzymes.

Other names

Eastern Russell's viper venom metalloproteinaseDaboia siamensis SVMPRussell's viper venom metalloproteinaseZinc-dependent venom endopeptidase

Inhibition of enzymatic activity through zinc ion chelation at the catalytic site or competitive inhibition of the substrate-binding pocket.