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• W1974846830 startingPage "3834" @default.
• W1974846830 abstract "Proton translocation experiments with intact cells of Halobacterium salinarium overproducing sensory rhodopsin I (SRI) revealed transport activity of SRI in a two-photon process. The vectoriality of proton translocation depends on pH, being outwardly directed above, and inwardly directed below, pH 5.7. Activation of the transport cycle requires excitation of the initial dark state of SRI, SRI590, to form the intermediate SRI380. Action spectra identify the photocycle intermediates SRI380 and SRI520 as the two photochemically reactive species in the outwardly directed transport process. As shown by flash photolysis experiments, SRI520 undergoes a so-far unknown photochemical reaction to SRI380 with a half-time of <200 micros. Mutation of SRI residue Asp-76, the residue which is equivalent to the proton acceptor Asp-85 in bacteriorhodopsin, to asparagine leads to inactivation of proton translocation. This demonstrates that the underlying mechanisms of proton transport in both retinal proteins share similar features. However, SRI is to our knowledge the first case where photochemical reactions between two thermally unstable photoproducts of a retinal protein constitute a catalytic ion transport cycle." @default.
• W1974846830 created "2016-06-24" @default.
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• W1974846830 date "1995-04-25" @default.
• W1974846830 modified "2023-10-13" @default.
• W1974846830 title "The photoreceptor sensory rhodopsin I as a two-photon-driven proton pump." @default.
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• W1974846830 doi "https://doi.org/10.1073/pnas.92.9.3834" @default.
• W1974846830 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/42056" @default.
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