Mitochondrial Inner Membrane Proton Gradient (PMF)

The mitochondrial inner membrane proton gradient is a fundamental electrochemical gradient established across the inner mitochondrial membrane during cellular respiration. It is essential for ATP synthesis in eukaryotic cells and underpins the process of oxidative phosphorylation. The gradient is generated by the electron transport chain (ETC), which pumps protons (H⁺) from the mitochondrial matrix into the intermembrane space, creating a pH gradient and a voltage gradient. This proton-motive force drives protons back into the matrix through ATP synthase, catalyzing ATP production. Disruption or uncoupling of this proton gradient impairs cellular energy production and can contribute to metabolic diseases or cell death. Modulation of proton leak is explored as a therapeutic avenue for various diseases.

Other names

Proton-motive forceElectrochemical proton gradientΔpΔμH+

Proton gradient drives ATP synthesis via ATP synthase; uncoupling agents dissipate the gradient.