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Electrophoretic transport of thallium ion in mitochondria

, : Electrophoretic transport of thallium ion in mitochondria. Journal of Membrane Biology 44(2): 187-194

The distribution of Tl+ between rat liver mitochondria and the medium was studied; mM or smaller concentrations of Tl+ were labeled with 204Tl. The Tl+ distribution responded to transient diffusion potentials in a way that indicated electrophoretic movements of Tl+. The diffusion potentials were induced by efflux of K+ in response to addition of valinomycin to nonrespiring mitochondria suspended in a medium with low concentrations of K+ or by efflux of H+ induced by making the medium more alkaline in the presence of a protonophorous (proton-conducting) uncoupling agent. Changes in membrane potential induced by valinomycin were followed with the aid of safranin. Tl+ brought about collapse of the diffusion potential. Apparently Tl+ is able to penetrate the mitochondrial membrane electrophoretically.

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