1KMO:
reference: Structural basis of gating by the outer membrane transporter FecA., Ferguson AD, Chakraborty R, Smith BS, Esser L, van der Helm D, Deisenhofer J, Science 2002 Mar 1;295(5560):1715-9. PMID: 11872840

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