4U8Y:
reference: Coupling of remote alternating-access transport mechanisms for protons and substrates in the multidrug efflux pump AcrB., Eicher T, Seeger MA, Anselmi C, Zhou W, Brandstatter L, Verrey F, Diederichs K, Faraldo-Gomez JD, Pos KM, Elife. 2014 Sep 19;3. doi: 10.7554/eLife.03145. PMID: 25248080

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