5YIO:
reference: The NMR solution structure of Mycobacterium tuberculosis F-ATP synthase subunit epsilon provides new insight into energy coupling inside the rotary engine., Joon S, Ragunathan P, Sundararaman L, Nartey W, Kundu S, Manimekalai MSS, Bogdanovic N, Dick T, Gruber G, FEBS J. 2018 Mar;285(6):1111-1128. doi: 10.1111/febs.14392. Epub 2018 Feb 6. PMID: 29360236

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