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. 2021 Aug 20;118(34):e2106750118. doi: 10.1073/pnas.2106750118

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Fig. 3. — Ubiquinone binding site. (A) A UQ8 in cyt bo₃ EM structure in MSP nanodisc is bound in the groove formed by TM0, TM1, and TM2. The head group of the ubiquinone is hydrogen bonded with residues R71^I and D75^I. (B) Surface representation of a UQ8 molecule bound in the groove formed by TM0, TM1, and TM2. (C) Superposition of the cyt bo₃ EM structure in MSP nanodiscs (yellow) and in SMA (green). In both cyt bo₃ structures, the density of H98^I indicates dual conformations, and “conformation 2” of H98^I is likely to form hydrogen bond with E14^I_.