2FYH:
reference: Characterization of a heat-stable enzyme possessing GTP-dependent RNA ligase activity from a hyperthermophilic archaeon, Pyrococcus furiosus., Kanai A, Sato A, Fukuda Y, Okada K, Matsuda T, Sakamoto T, Muto Y, Yokoyama S, Kawai G, Tomita M, RNA. 2009 Mar;15(3):420-31. Epub 2009 Jan 20. PMID: 19155324

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