Valinomycin-Induced Uptake of Potassium in Membrane Vesicles from Escherichia coli
- 1 July 1971
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 68 (7) , 1488-1492
- https://doi.org/10.1073/pnas.68.7.1488
Abstract
Osmotically shocked Escherichia coli and membrane vesicle ghosts from E. coli cells have lost the ability to accumulate potassium by active transport. The addition of valinomycin to the membrane ghosts restores the capacity to accumulate radioactive (42)K and (86)Rb by a temperature- and energy-dependent process. Membrane vesicles prepared from mutants of E. coli altered in potassium transport show defects in the valinomycin-stimulated accumulation of (42)K that are related to the defects in the intact cells.Keywords
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