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- W2005369504 abstract "The effects of the ionophorous or transport-inducing antibiotics, valinomycin, nigericin, monensin, dianemycin, X-206, X-464 and X-537A on the light-induced proton, K+ and Na+ uptake, electron transport and ATP formation were studied. Nigericin, monensin, dianemycin, X-206, X-464 and X-537A uncoupled photophosphorylation in the presence of a suitable alkali metal cation, inducing the uptake of the alkali metal cation while inhibiting the light-induced pH change. The selectivity for alkali-metal cations exhibited by these antibiotics was determined and found to be similar to that determined in mitochondrial and artificial membranes. The ratios of K+/ΔDH+ determined at a given concentration of antibiotics were in the order of 6–10, whereas the Na+/ΔDH+ ratios for a similar inhibition of the light-induced proton uptake were between 10–40. Valinomycin primarily enhanced permeability to K+, carbonyl cyanide p-trifluoromethoxyphenylhydrazone enhanced permeability to H+, and gramicidin that to both K+ and H−. With suboptimal concentrations of nigericin which only slightly uncoupled phosphorylation but induced a measurable K+ uptake, the addition of valinomycin synergistically uncoupled photophosphorylation. These results suggest the participation of a membrane potential in ATP formation in chloroplasts and are discussed in comparison with similar effects described for subchloroplast and chromatophore particles." @default.
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- W2005369504 title "II. Effects of ionophorous antibiotics in chloroplasts" @default.
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- W2005369504 doi "https://doi.org/10.1016/0005-2728(70)90172-6" @default.
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