Figure 7.

Schematic of the dimeric complex III model by Bazil et al. [99]. The 6 states represent the number of electrons in complex III. The model includes one-electron transfer reactions (orange arrows): ubiquinol oxidation at the Qo site (one electron goes to heme bL, the other goes through ISP, cytochrome c1, and finally to cytochrome c) as well as oxygen reduction to superoxide. The model also has a two-electron transfer reaction: Q reduction at the Qi site. The figure was reprinted/adapted from Ref. [99].