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- W2067740037 abstract "The effect of octylguanidine and oligomycin on the oxygen uptake of rat liver mitochondria and on the ATPase activity of sonic submitochondrial particles has been studied. 1. Octylguanidine inhibits state 3 respiration with glutamate-malate and succinate as substrates, but much lower concentrations are required to inhibit oxygen uptake with the former substrates. State 4 respiration is unaffected by octylguanidine. 2. The titration-curve for the octylguanidine inhibition of glutamate-malate oxidation is hyperbolic and apparently biphasic, half-maximal inhibition is obtained at 30 muM octylguanidine. The octylguanidine-curve for inhibition of succinate oxidation is sigmoid with half-maximal inhibition at about 250 muM. 3. Octylguanidine and oligomycin show additive inhibitory action on state 3 respiration with both glutamate plus malage and succinate as respiratory substrates. 4. Concentrations of oligomycin or octylguanidine, which added separately are ineffective on state 3 respiration, become inhibitory when the two inhibitors are added together. 5. Octylguanidine inhibits the ATPase activity of sonic submitochondrial particles with a hyperbolic titration-curve analogous to that obtained for oligomycin inhibition. The inhibitory actions of octylguanidine and oligomycin on the ATPase activity are additive. 6. It is concluded that octylguanidine acts directly on the ATPase complex and that its binding at the action site is mutually exclusive with the binding of oligomycin. A kinetic explanation is given for the reported higher sensitivity of site I phosphorylation to octylguanidine." @default.
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- W2067740037 date "1975-06-01" @default.
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- W2067740037 title "On the Mechanism of Action of Alkylguanidines on Oxidative Phosphorylation in Mitochondria" @default.
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- W2067740037 doi "https://doi.org/10.1111/j.1432-1033.1975.tb02131.x" @default.
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