3ZCN:
reference: Conserved inhibitory mechanism and competent ATP binding mode for adenylyltransferases with fic fold., Goepfert A, Stanger FV, Dehio C, Schirmer T, PLoS One. 2013 May 30;8(5):e64901. doi: 10.1371/journal.pone.0064901. Print 2013. PMID: 23738009

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