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• W1973906711 abstract "The voltage dependence of light-induced proton pumping was studied with bacteriorhodopsin (bR) from Halobacterium salinarum, expressed in the plasma membrane of oocytes from Xenopus laevis in the range −160 mV to +60 mV at different light intensities. Depending on the applied field, the quenching effect by blue light, which bypasses the normal photo and transport cycle, is drastically increased at inhibiting (negative) potentials, and is diminished at pump current increasing (positive) potentials. At any potential, two processes with different time constants for the M → bR decay of ∼5 ms (τ1) and ∼20 ms (τ2) are obtained. At pump-inhibiting potentials, a third, long-lasting process with τ3 ≈ 300 ms at neutral pH is observed. The fast processes (τ1, τ2) can be assigned to the decay of M2 in the normal pump cycle, i.e., to the reprotonation of the Schiff base via the cytoplasmic side, whereas τ3 is due to the decay of M1 without net pumping, i.e., the reprotonation of the Schiff base via the extracellular side. The results are supported by determination of photocurrents induced by bR on planar lipid films. The pH dependence of the slow decay of M1 is fully in agreement with the interpretation that the reprotonation of the Schiff base occurs from the extracellular side. The results give strong evidence that an externally applied electrical field changes the ratio of the M1 and the M2 intermediate. As a consequence, the transport cycle branches into a nontransporting cycle at negative potentials. This interpretation explains the current-voltage behavior of bR on a new basis, but agrees with the isomerisation, switch, transfer model for vectorial transport." @default.
• W1973906711 created "2016-06-24" @default.
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• W1973906711 date "1998-01-01" @default.
• W1973906711 modified "2023-10-11" @default.
• W1973906711 title "Voltage Dependence of Proton Pumping by Bacteriorhodopsin Is Regulated by the Voltage-Sensitive Ratio of M1 to M2" @default.
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• W1973906711 doi "https://doi.org/10.1016/s0006-3495(98)77797-5" @default.
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