Reactions and rate constants for complex III.

Reverse rate constants marked (Kr) are calculated from the respective forward rate constants and midpoint potentials (ΔE) as described in [23]. Although the reactions of electron transport are shown in simplified form as bimolecular, in fact they are performed (and simulated in the model) as transitions between the states of the whole complex (monomolecular). The units of rate constants are described in the legend of Table 1 ( s−1 for monomolecular reactions and s−1·(nmol/mg prot)−1 for the rate constants of bimolecular binding).