Conductance matching of oxidative phosphorylation

This necessary and sufficient condition called conductance matching of oxidative phosphorylation relates the ratio of load and phosphorylation conductance to the degree of coupling.1 Thus, for any given degree of coupling and value of the conductance of phosphorylation, we can exactly... 

For mitochondria, L33 is an overall phenomenological coefficient lumping together all the conductances of ATP-utilizing processes, while Lx x shows the conductance of phosphorylation. If these two coefficients match according to Eq. (11.111), then the natural steady state of oxidative phosphorylation is at the optimal efficiency. Stucki called Eq. (11.111) the condition of conductance matching of oxidative phosphorylation, and presented an experimental verification. 

Here L is called the conductance matching of oxidative phosphorylation, and is defined by L = LpsJ -q (Stucki, 1980). 

The optimum output power JxX )0Vt and the efficiency 0/, A, Tn)( nl are calculated from the plots of JxXx vs. x and JxXx r) vs. x, respectively. A transition from qv to q causes a 12% drop in output power (./,.V,) and a 51% increase in efficiency. For a favorable ATP production at optimal efficiency of oxidative phosphorylation, we should have q < 1. With the consideration of conductance matching, Stucki (1980) determined four production functions, which are given in Table 11.4. 

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