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- W1505654893 abstract "1. α-p-Chlorophenoxyisobutyric acid, the ethyl ester of which is widely used as an antihypercholesterolaemic drug, is an inhibitor of energy-transfer reactions in isolated rat liver mitochondria. 2. The compound at lower concentrations (<4.0μmol/mg of mitochondrial protein) inhibits state 3 oxidation, stimulates state 4 oxidation, abolishes respiratory control and stimulates the latent adenosine triphosphatase activity of mitochondria. The inhibition imposed on state 3 oxidation is relieved by dinitrophenol. 3. At higher concentrations it inhibits coupled phosphorylation as well as dinitrophenol-stimulated adenosine triphosphatase activity. The inhibition of state 3 oxidation under these conditions is not reversed by uncouplers. 4. The three coupling sites of phosphorylation exhibit differential susceptibility to inactivation by this compound. Coupled phosphorylation at the first site is abolished at a drug concentration of 3.0μmol/mg of protein. The third site is inactivated when the concentration of the drug reaches 5.0μmol/mg of protein. The second site is the most refractory and drug concentrations of the order of 10.0μmol/mg of protein are required effectively to inhibit phosphorylation at this site. 5. The compound also inhibits ATP-dependent reversal of electron transport as well as the adenosine triphosphatase activity in submitochondrial particles. 6. The oxidation of NADH and succinate in these particles is not inhibited. 7. These properties indicate that the compound acts as an ‘inhibitory uncoupler’ of energy-transfer reactions in isolated mitochondria." @default.
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- W1505654893 title "Mode of inhibition of mitochondrial energy transduction by chlorophenoxyisobutyrate" @default.
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- W1505654893 doi "https://doi.org/10.1042/bj1420253" @default.
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