1WVT:
reference: Molecular properties of two proteins homologous to PduO-type ATP:cob(I)alamin adenosyltransferase from Sulfolobus tokodaii., Tanaka Y, Sasaki T, Kumagai I, Yasutake Y, Yao M, Tanaka I, Tsumoto K, Proteins. 2007 Aug 1;68(2):446-57. PMID: 17492665

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