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- Bertero 2022 Function (Oxf) + (In the current issue of Function, Juhaszov … In the current issue of Function, Juhaszova and colleagues3 substantially challenge—or rather expand, but do not tumble—this concept in revealing that in addition to H+, potassium ion (K+) flux through the F1Fo-ATP synthase (working the same way as H+) provides the majority of energy to produce ATP (Figure 1). Why was this was overlooked for more than six decades? Presumably because the F1Fo-ATP synthase has a > 107-fold selectivity for H+ over other cations.4 But what was not sufficiently considered is that due to the 106-fold higher cytosolic concentration for K+ (∼100 mM) than for H+(∼100 nM), such that K+ flux—driven mostly by the same high electrical driving force (∆Ψm) - could be comparable to H+ flux via the ATP synthase.e comparable to H+ flux via the ATP synthase.)