2GDX:
reference: Conformational switches modulate protein interactions in peptide antibiotic synthetases., Koglin A, Mofid MR, Lohr F, Schafer B, Rogov VV, Blum MM, Mittag T, Marahiel MA, Bernhard F, Dotsch V, Science. 2006 Apr 14;312(5771):273-6. PMID: 16614225

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