Agkistrodon acutus venom metalloproteinase (AaVMP)

Agkistrodon acutus venom metalloproteinases (SVMPs) are a diverse group of zinc-dependent proteolytic enzymes found in the venom of the sharp-nosed pit viper, a medically significant snake species in East Asia (UniProt Consortium, 2024). These enzymes, which include specific isoforms like acutolysin A, B, and C, belong to the reprolysin (M12B) family and are the primary agents responsible for the severe local and systemic hemorrhage characteristic of A. acutus envenomation (Bi et al., 2005). SVMPs function by degrading key structural components of the vascular basement membrane, such as type IV collagen, laminin, and fibronectin, which leads to the weakening and eventual rupture of capillary vessels (Sánchez and Rodríguez-Acosta, 2008). Beyond their hemorrhagic activity, these enzymes also contribute to tissue necrosis and interfere with the coagulation cascade by degrading fibrinogen or activating prothrombin (Toxins, 2018). The primary therapeutic intervention is the administration of specific antivenoms, which contain antibodies that bind and neutralize the toxins (World Health Organization, 2016). Additionally, research into small-molecule inhibitors like batimastat and marimastat suggests potential for adjunctive therapy to limit early tissue damage before hospital-based antivenom treatment is available (PubMed, 2021).

Other names

AcutolysinSharp-nosed pit viper venom metalloproteinaseHundred-pace viper venom metalloproteinaseSnake venom metalloproteinaseSVMP

Neutralization of proteolytic activity through antibody binding or competitive inhibition of the zinc-dependent catalytic site.