6AWF:
reference: New crystal forms of the integral membrane Escherichia coli quinol:fumarate reductase suggest that ligands control domain movement., Starbird CA, Tomasiak TM, Singh PK, Yankovskaya V, Maklashina E, Eisenbach M, Cecchini G, Iverson TM, J Struct Biol. 2017 Nov 20. pii: S1047-8477(17)30193-4. doi:, 10.1016/j.jsb.2017.11.004. PMID: 29158068

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