2VUG:
reference: The structure of an archaeal homodimeric ligase which has RNA circularization activity., Brooks MA, Meslet-Cladiere L, Graille M, Kuhn J, Blondeau K, Myllykallio H, van Tilbeurgh H, Protein Sci. 2008 Aug;17(8):1336-45. Epub 2008 May 29. PMID: 18511537

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