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• W2024406086 abstract "Sensory rhodopsin-I (SRI) functions as a color discriminating receptor in halobacterial phototaxis. SRI exists in the membrane as a molecular complex with a signal transducer protein. Excitation of its thermally stable form, SRI(587), generates a long-lived photointermediate of its photocycle, S(373), and an attractant phototactic response. S(373) decays thermally in a few seconds into SRI(587.) However, when S(373) is excited by UV-blue light, it photoconverts into SRI(587) in less than a second, generating a repellent phototactic response. Only one intermediate of this back-photoreaction, S(b)(510), is known. We studied the back-photoreaction in both native SRI and its transducer free form fSRI by measuring laser flash induced absorption changes of S(373) photoproducts from 100 ns to 1 s in the 350-750 nm range. Using global exponential fitting, we determined the spectra and kinetics of the photointermediates. S(373) and fS(373) when pumped with 355 nm laser light generate in less than 100 ns two intermediate species: a previously undetected species that absorbs maximally at about 410 nm, S(b)(410), and the previously described S(b)(510). These two intermediates appear to be in a rapid equilibrium, which probably entails protonation change of the Schiff base chromophore. At pH 6 this system relaxes to SRI(587) via another intermediate absorbing maximally around 550 nm, which thermally decays back to the ground state. The same intermediates are seen in the presence and absence of transducer; however, the kinetics are affected by binding of the transducer." @default.
• W2024406086 created "2016-06-24" @default.
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• W2024406086 date "2000-11-16" @default.
• W2024406086 modified "2023-10-17" @default.
• W2024406086 title "New Photointermediates in the Two Photon Signaling Pathway of Sensory Rhodopsin-I" @default.
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• W2024406086 doi "https://doi.org/10.1021/bi0013290" @default.
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