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- W1514491637 abstract "The relationship between the steady-state level of membrane potential (delta psi) and the rates of energy production and consumption has been studied in mitochondria and submitochondrial particles. The energy-linked reactions investigated were oxidative phosphorylation (with NADH, succinate, and beta-hydroxybutyrate as respiratory substrates) and nucleoside triphosphate-driven transhydrogenation from NADH to NADP and uphill electron transfer from succinate to NAD. Results have shown the following. 1) Attenuation of the rates of the energy-producing reactions results in a parallel change in the rates of the energy-consuming reactions with little or no change in the magnitude of steady-state delta psi. 2) At low rates of energy production and consumption, steady-state delta psi decreases. However, this is due largely to the energy leak of the system which lowers static-head delta psi when the rate of energy production is slow. 3) When the rate of energy production and static-head delta psi are held constant, and the rate of energy consumption is diminished by partial inhibition or the use of suboptimal conditions (e.g. subsaturating substrate concentrations), then even a small decrease in the rate of energy consumption results in an upward adjustment of the level of steady-state delta psi. The lower the rate of energy input, the greater the upward adjustment of steady-state delta psi upon suppression of the rate of energy consumption. 4) The above results have been discussed with regard to the role of bulk-phase delta mu H+ or delta psi in the mitochondrial energy transfer reactions." @default.
- W1514491637 created "2016-06-24" @default.
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- W1514491637 date "1987-10-01" @default.
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- W1514491637 title "Studies on the mechanism of oxidative phosphorylation. Flow-force relationships in mitochondrial energy-linked reactions." @default.
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- W1514491637 doi "https://doi.org/10.1016/s0021-9258(18)47918-5" @default.
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