4ZGP:
reference: Cdc123, a Cell Cycle Regulator Needed for eIF2 Assembly, Is an ATP-Grasp Protein with Unique Features., Panvert M, Dubiez E, Arnold L, Perez J, Mechulam Y, Seufert W, Schmitt E, Structure. 2015 Sep 1;23(9):1596-608. doi: 10.1016/j.str.2015.06.014. Epub 2015, Jul 23. PMID: 26211610

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