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• W2007373469 abstract "Sensory rhodopsin II (SRII) in Halobacterium salinarum membranes is a phototaxis receptor that signals through its bound transducer HtrII for avoidance of blue-green light. In the present study we investigated the proton movements during the photocycle of SRII in the HtrII-free and HtrII-complexed form. We monitored sustained light-induced pH changes with a pH electrode, and laser flash-induced pH changes with the pH indicator pyranine using sealed membrane vesicles and open sheets containing the free or the complexed receptor. The results demonstrated that SRII takes up a proton in M-to-O conversion and releases it during O-decay. The uptake and release are from and to the extracellular side, and therefore SRII does not transport the proton across the membrane. The pH dependence of the SRII photocycle indicated the presence of a protonatable group (pKa ∼7.5) in the extracellular proton-conducting path, which plays a role in proton uptake by the Schiff base in the M-to-O conversion. The extracellular proton circulation produced by SRII was not blocked by HtrII complexation, unlike the cytoplasmic proton conduction in SRI that was found in the same series of measurements to be blocked by its transducer, HtrI. The implications of this finding for current models of SRI and SRII signaling are discussed." @default.
• W2007373469 created "2016-06-24" @default.
• W2007373469 creator A5059177152 @default.
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• W2007373469 date "1999-10-01" @default.
• W2007373469 modified "2023-10-16" @default.
• W2007373469 title "Proton Circulation During the Photocycle of Sensory Rhodopsin II" @default.
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• W2007373469 doi "https://doi.org/10.1016/s0006-3495(99)77055-4" @default.
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