Agkistrodon piscivorus venom proteins

The venom of Agkistrodon piscivorus (Cottonmouth) is a complex mixture of proteins that function synergistically to cause systemic and local toxicity. Major components include snake venom metalloproteinases (SVMPs), which degrade the basement membrane of blood vessels leading to hemorrhage, and phospholipases A2 (PLA2s), which cause myonecrosis and inflammation (Lomonte et al., 2014). Serine proteases in the venom act as thrombin-like enzymes, depleting fibrinogen and causing venom-induced consumptive coagulopathy, while L-amino-acid oxidases contribute to tissue damage through the production of reactive oxygen species and induction of apoptosis (Sunagar et al., 2015). Disintegrins are also present, which inhibit platelet aggregation by competitively binding to the integrin alpha-IIb-beta-3 receptor (UniProt, 2023). These proteins are the primary therapeutic targets for antivenoms like CroFab and Anavip, which utilize purified antibody fragments to sequester and neutralize the toxins (FDA, 2018). Beyond their role in envenomation, these proteins have been studied as molecular templates for developing anticoagulants and anti-cancer agents due to their high specificity for physiological receptors. Clinical management of envenomation requires monitoring of hematologic parameters to assess the efficacy of neutralization. The diversity of these proteins necessitates a polyvalent approach to treatment to ensure all toxic components are addressed.

Other names

Cottonmouth venom proteinsWater moccasin venom toxinsAgkistrodon piscivorus venom proteomeAgkistrodon piscivorus venom metalloproteinases, phospholipases A2, serine proteases, L-amino-acid oxidases, disintegrins, and related venom proteins

Neutralization of toxic enzymatic and non-enzymatic activities through antibody binding, preventing interaction with host substrates and receptors (FDA, 2018).