3SSO:
reference: A new structural form in the SAM/metal-dependent omethyltransferase family: MycE from the mycinamicin biosynthetic pathway., Akey DL, Li S, Konwerski JR, Confer LA, Bernard SM, Anzai Y, Kato F, Sherman DH, Smith JL, J Mol Biol. 2011 Oct 21;413(2):438-50. Epub 2011 Aug 23. PMID: 21884704

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