4yz7
From Proteopedia
Crystal structure of Piratoxin I (PrTX-I) complexed to aristolochic acid
Structural highlights
Function[PA2H1_BOTPI] Snake venom phospholipase A2 (PLA2) homolog that lacks enzymatic activity, but displays myotoxin and edema-inducing activities in vivo. In vitro neuromuscular activities have also been observed, but they are not found in vivo and can be explained by the destabilization of the muscle membrane by the toxin. The myotoxic activity is inhibited by rosmarinic acid (RA).[1] [2] Publication Abstract from PubMedOne of the main challenges in toxicology today is to develop therapeutic alternatives for the treatment of snake venom injuries that are not efficiently neutralized by conventional serum therapy. Venom phospholipases A2 (PLA2s) and PLA2-like proteins play a fundamental role in skeletal muscle necrosis, which can result in permanent sequelae and disability. This leads to economic and social problems, especially in developing countries. In this work, we performed structural and functional studies with Piratoxin-I, a Lys49-PLA2 from Bothropspirajai venom, complexed with two compounds present in several plants used in folk medicine against snakebites. These ligands partially neutralized the myotoxic activity of PrTX-I towards binding on the two independent sites of interaction between Lys49-PLA2 and muscle membrane. Our results corroborate the previously proposed mechanism of action of PLA2s-like and provide insights for the design of structure-based inhibitors that could prevent the permanent injuries caused by these proteins in snakebite victims. Structural Basis for the Inhibition of a Phospholipase A2-Like Toxin by Caffeic and Aristolochic Acids.,Fernandes CA, Cardoso FF, Cavalcante WG, Soares AM, Dal-Pai M, Gallacci M, Fontes MR PLoS One. 2015 Jul 20;10(7):e0133370. doi: 10.1371/journal.pone.0133370., eCollection 2015. PMID:26192963[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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