2XTR:
reference: Activation of colicin M by the FkpA prolyl cis-trans isomerase/chaperone., Helbig S, Patzer SI, Schiene-Fischer C, Zeth K, Braun V, J Biol Chem. 2010 Dec 13. PMID: 21149455

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