chemiosmosis


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chemiosmosis

The movement of ions across a selectively permeable membrane down an electrochemical gradient, usually understood to mean the respiratory chain in mitochondria. As the proton concentration increases in the intermembrane space, a strong electrochemical gradient is established across the inner membrane. The protons can return to the matrix through the ATP synthase complex, and their potential energy is used to synthesise ATP from ADP and inorganic phosphate (Pi).

chemiosmosis

see ELECTRON TRANSPORT SYSTEM.

chemiosmosis

a process in which a proton gradient across a mitochondrial membrane and ATP synthesis pump metabolites across a membrane.
References in periodicals archive ?
Thermodynamic constraints mean that chemiosmosis is strictly necessary for carbon and energy metabolism in all organisms that grow from simple chemical ingredients [autotrophy] today, and presumably the first free-living cells," said Lane.
This was a vital transition, as chemiosmosis is the only mechanism by which organisms could escape from the vents.