3GYY:
reference: Evidence for an allosteric mechanism of substrate release from membrane-transporter accessory binding proteins., Marinelli F, Kuhlmann SI, Grell E, Kunte HJ, Ziegler C, Faraldo-Gomez JD, Proc Natl Acad Sci U S A. 2011 Nov 14. PMID: 22084072

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