4DT0:
reference: The Structure of Subunit E of the Pyrococcus horikoshii OT3 A-ATP Synthase Gives Insight into the Elasticity of the Peripheral Stalk., Balakrishna AM, Hunke C, Gruber G, J Mol Biol. 2012 Apr 16. PMID: 22516614

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