ATPase activity in compartment C4 relative to total ATPase activity at given ATP concentration (A), or related to maximal ATP synthase rate (B).

<p>Regardless of the used model, NKA inhibition reduces the relative activity in compartment C4. Here, the ATPase activities are calculated with inhibited respiration and regeneration of ATP by exogenous and endogenous PK, as in the experiments performed in spectrophotometer in this work.