4LX9:
reference: Implications for the evolution of eukaryotic amino-terminal acetyltransferase (NAT) enzymes from the structure of an archaeal ortholog., Liszczak G, Marmorstein R, Proc Natl Acad Sci U S A. 2013 Sep 3;110(36):14652-7. doi:, 10.1073/pnas.1310365110. Epub 2013 Aug 19. PMID: 23959863

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