3ZK2:
reference: A new type of na(+)-driven ATP synthase membrane rotor with a two-carboxylate ion-coupling motif., Schulz S, Iglesias-Cans M, Krah A, Yildiz O, Leone V, Matthies D, Cook GM, Faraldo-Gomez JD, Meier T, PLoS Biol. 2013 Jun;11(6):e1001596. doi: 10.1371/journal.pbio.1001596. Epub 2013 , Jun 25. PMID: 23824040

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