Bothrops phospholipase A2 (PLA2)

Bothrops phospholipases A2 (PLA2s) are a diverse group of enzymes found in the venom of pit vipers belonging to the Bothrops genus, which are responsible for the majority of snakebite accidents in Latin America (Gutiérrez & Lomonte, 2013). These enzymes primarily function by hydrolyzing the sn-2 ester bond of glycerophospholipids, leading to the release of fatty acids and lysophospholipids that disrupt cell membranes and trigger inflammatory cascades (Lomonte et al., 2009). In the context of envenomation, Bothrops PLA2s induce severe local effects such as myonecrosis, edema, and hemorrhage, as well as systemic effects like anticoagulation and neurotoxicity (Fernandes et al., 2014). While traditional treatment relies on equine-derived antivenoms, these often fail to neutralize the local tissue damage effectively due to the rapid action of PLA2s (Gutiérrez et al., 1998). Consequently, these enzymes have become critical targets for small-molecule inhibitors like Varespladib, which aim to provide early intervention and reduce the morbidity associated with snakebites (Lewin et al., 2016). Understanding the structural diversity of these enzymes, including both catalytically active (Asp49) and inactive but toxic (Lys49) variants, is essential for developing broad-spectrum therapeutics (UniProt, 2024).

Other names

Snake venom phospholipase A2svPLA2Bothropic PLA2MyotoxinPhosphatidylcholine 2-acylhydrolaseGroup IIA secretory phospholipase A2

Inhibitors like Varespladib act as competitive antagonists that bind to the active site of the PLA2 enzyme, specifically interacting with the catalytic residues (e.g., His48, Asp49) and the calcium-binding loop, thereby preventing the binding and hydrolysis of phospholipid substrates and the subsequent release of inflammatory mediators (Lewin et al., 2016; PubChem, 2024).