Uncoupler
Type of bilogical molecule / From Wikipedia, the free encyclopedia
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An uncoupler or uncoupling agent is a molecule that disrupts oxidative phosphorylation in prokaryotes and mitochondria or photophosphorylation in chloroplasts and cyanobacteria by dissociating the reactions of ATP synthesis from the electron transport chain. The result is that the cell or mitochondrion expends energy to generate a proton-motive force, but the proton-motive force is dissipated before the ATP synthase can recapture this energy and use it to make ATP. Because the intracellular supply of protons is replenished, uncouplers actually stimulate cellular metabolism. Uncouplers are capable of transporting protons through mitochondrial and lipid membranes.