4ML1:
reference: The multidrug resistance IncA/C transferable plasmid encodes a novel domain swapped dimeric protein disulfide isomerase., Premkumar L, Kurth F, Neyer S, Schembri MA, Martin JL, J Biol Chem. 2013 Dec 5. PMID: 24311786

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