Fig. 2. Two proposed mechanisms of electron transfer. Symmetric (A) and asymmetric electron flow (B) through CIII are shown. Ubiquinol trail from CI to CIII is shown as a black thick line. The electron trail and transport of protons are shown as a black line. The hemes and FeS clusters are shown as spheres and the ubiquinol molecule are shown as sticks in the red oval. The ubiquinone binding site is shown in the blue dashed circle. The transmembrane region is indicated by two curved lines. The proximal and distal domains of CIII are colored in cyan and yellow, respectively. The CI and CIV are colored in magenta and grey, respectively. CI, complex I; CIII, complex III; CIV, complex IV.

Applied Microscopy 2018;48:81-6

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