1WKB:
reference: Crystal Structure of Leucyl-tRNA Synthetase from the Archaeon Pyrococcus horikoshii Reveals a Novel Editing Domain Orientation., Fukunaga R, Yokoyama S, J Mol Biol 2005 Feb 11;346(1):57-71. Epub 2004 Dec 19. PMID: 15663927

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