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• W1567698145 abstract "Experiments with the aerotolerant anaerobe Streptococcus lactis provide the opportunity for determining the proton motive force (Δ p ) in dividing cells. The two components of Δ p , ΔΨ (the transmembrane potential) and ΔpH (the chemical gradient of H + ), were determined by the accumulation of radiolabeled tetraphenylphosphonium (TPP + ) and benzoate ions. The ΔΨ was calibrated with the K + diffusion potential in starved, valinomycin-treated cells. With resting, glycolyzing cells, the Δ p was measured also by the accumulation of the non-metabolizable sugar thiomethyl-β-galactoside (TMG). In resting cells the Δ p , calculated either by adding ΔΨ and Z ΔpH or from the levels of TMG, was relatively constant between pH 5 to 7, decreasing from 160 to 150 mV and decreasing further to 100 mV at pH 8.0. With the TPP + probe for ΔΨ, we confirmed our previous finding that the K + ions dissipate ΔΨ and increase ΔpH, whereas Na + ions have little effect on ΔΨ and no effect on ΔpH. [ 3 H]TPP + and [ 14 C]benzoate were added during exponential phase to S. lactis cells growing at pH 5 to 7 at 28°C in a defined medium with glucose as energy source. As with resting cells, the ΔpH and ΔΨ were dependent on the pH of the medium. At pH 5.1, the ΔpH was equivalent to 60 mV (alkaline inside) and decreased to 25 mV at pH 6.8. The ΔΨ increased from 83 mV (negative inside) at pH 5.1 to 108 mV at pH 6.8. The Δ p , therefore, was fairly constant between pH 5 and 7, decreasing from 143 to 133 mV. The values for Δ p in growing cells, just as in resting cells, are consistent with a system in which the net efflux of H + ions is effected by a membrane-bound adenosine triphosphatase and glycolytically generated adenosine triphosphate. The data suggest that in both growing and resting cells the pH of the medium and its K + concentration are the two principal factors that determine the relative contribution of ΔpH and ΔΨ to the proton motive force." @default.
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• W1567698145 date "1980-07-01" @default.
• W1567698145 modified "2023-09-25" @default.
• W1567698145 title "Proton Motive Force During Growth of <i>Streptococcus lactis</i> Cells" @default.
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• W1567698145 doi "https://doi.org/10.1128/jb.143.1.128-134.1980" @default.
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