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• W1547667074 abstract "The electrogenicity of H+/Ca2+ exchange in vacuolar membrane (tonoplast) vesicles from Beta was studied to elucidate the role of this transport system in vacuolar Ca2+ accumulation. To overcome the inherently high proton permeability of tonoplast vesicles, the pH difference established by the primary H(+)-ATPase was titrated to a uniform value by variation of the concentration either of ATP or of a permanent anion (Cl-). This enabled manipulation of membrane potential independently of the transmembrane pH difference, with a higher inside-positive membrane potential produced at lower Cl- concentrations. The rate and the extent of uncoupler-sensitive Ca2+ uptake are both stimulated about 2-fold in conditions of more positive membrane potential, suggesting that the transport system translocates positive charge outward during Ca2+ uptake. A minimum integral H+:Ca2+ stoichiometry of 3 results in a driving force for Ca2+ accumulation in the vacuole amounting to -140 mV in typical physiological conditions. It is concluded that the antiporter is thermodynamically competent to account for Ca2+ accumulation in plant vacuoles and that its reversal in vivo is unlikely." @default.
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• W1547667074 date "1990-06-01" @default.
• W1547667074 modified "2023-09-27" @default.
• W1547667074 title "Voltage sensitivity of H+/Ca2+ antiport in higher plant tonoplast suggests a role in vacuolar calcium accumulation." @default.
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• W1547667074 doi "https://doi.org/10.1016/s0021-9258(19)38713-7" @default.
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