1CIA:
reference: Replacement of catalytic histidine-195 of chloramphenicol acetyltransferase: evidence for a general base role for glutamate., Lewendon A, Murray IA, Shaw WV, Gibbs MR, Leslie AG, Biochemistry 1994 Feb 22;33(7):1944-50. PMID: 7906544

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