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- W2039698971 abstract "1. Mitochondria from aerobically grown wild-type yeast Saccharomyces cerevisiae, incubated anaerobically in a K+-containing medium are impermeable to protons. Permeability to protons was induced by uncoupler in the presence of valinomycin. Swelling in potassium acetate and energy-dependent K+ transport induced by valinomycin were similar to those of mammalian mitochondria except that the extent of the volume changes or of K+ uptake was considerably smaller with yeas mitochondria. 2. Mitochondria isolated from a cytoplasmic respiration-deficient “petite” mutant were also quite impermeable to H+. As in wild-type yeast mitochondria, valinomycin enhanced the passive permeability for K+ in the mutant mitochondria and, together with an uncoupler, induced proton permeability. However, no ATP-dependent K+ uptake could be demonstrated. 3. In contrast to wild-type yeast mitochondria, mitochondria from the respiration-deficient mutant exhibited neither uncoupler-sensitive 32Pi-ATP exchange nor a decrease in 8-anilino-1-naphthalene sulphonic acid, sodium salt (ANS) fluorescence on addition of ATP. It is concluded that although the permeability characteristics of the mutant mitochondria are similar to those of normal yeast mitochondria, the terminal segment of the energy-transfer system is rendered non-functional by the cytoplasmic mutation." @default.
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- W2039698971 date "1972-01-01" @default.
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- W2039698971 title "Translocation of protons and potassium ions across the mitochondrial membrane of respiring and respiration-deficient yeasts" @default.
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- W2039698971 doi "https://doi.org/10.1016/0005-2728(72)90162-4" @default.
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