1V4G:
reference: Crystal structure of gamma-glutamylcysteine synthetase: insights into the mechanism of catalysis by a key enzyme for glutathione homeostasis., Hibi T, Nii H, Nakatsu T, Kimura A, Kato H, Hiratake J, Oda J, Proc Natl Acad Sci U S A 2004 Oct 19;101(42):15052-7. Epub 2004 Oct 11. PMID: 15477603

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).