4YZ7 image
Entry Detail
PDB ID:
4YZ7
Keywords:
Title:
Crystal structure of Piratoxin I (PrTX-I) complexed to aristolochic acid
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2015-03-24
Release Date:
2015-08-05
Method Details:
Experimental Method:
Resolution:
1.96 Å
R-Value Free:
0.23
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Basic phospholipase A2 homolog piratoxin-1
Chain IDs:A, B
Chain Length:121
Number of Molecules:2
Biological Source:Bothrops pirajai
Primary Citation
Structural Basis for the Inhibition of a Phospholipase A2-Like Toxin by Caffeic and Aristolochic Acids.
Plos One 10 e0133370 e0133370 (2015)
PMID: 26192963 DOI: 10.1371/journal.pone.0133370

Abstact

One 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.

Legend

Protein

Chemical

Disease

Primary Citation of related structures