1GPJ:
reference: V-shaped structure of glutamyl-tRNA reductase, the first enzyme of tRNA-dependent tetrapyrrole biosynthesis., Moser J, Schubert WD, Beier V, Bringemeier I, Jahn D, Heinz DW, EMBO J 2001 Dec 3;20(23):6583-90. PMID: 11726494

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