ANALYSIS OF PRIMARY PHOTOCHEMICAL PROCESSES IN BACTERIORHODOPSIN

U. Dinur; B. Honig; M. Ottolenghi

doi:10.1111/j.1751-1097.1981.tb05455.x

ANALYSIS OF PRIMARY PHOTOCHEMICAL PROCESSES IN BACTERIORHODOPSIN

U. Dinur, B. Honig, M. Ottolenghi

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27 Scopus citations

Abstract

Abstract— The sequence of primary events following light absorption by light adapted bacteriorhodopsin (bR₅₇₀) is considered by analyzing recent picosecond absorption and emission data. The analysis is facilitated by theoretical calculations which allow us to characterize the properties of the first excited singlet state. It is concluded that excitation leads to the eventual population of a photochemically important nonfluorescent excited state (I) which decays into a photoproduct (J₆₂₅)‐ In J₆₂₅, which is most probably a ground state molecule, the chromophore has undergone a structural change, presumably trans→ 13‐cis isomerization. It is suggested that the subsequent process reflects a relaxation of the protein environment involving proton transfer.

Original language	English
Pages (from-to)	523-527
Number of pages	5
Journal	Photochemistry and Photobiology
Volume	33
Issue number	4
DOIs	https://doi.org/10.1111/j.1751-1097.1981.tb05455.x
State	Published - 1 Jan 1981
Externally published	Yes

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry

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abstract = "Abstract— The sequence of primary events following light absorption by light adapted bacteriorhodopsin (bR570) is considered by analyzing recent picosecond absorption and emission data. The analysis is facilitated by theoretical calculations which allow us to characterize the properties of the first excited singlet state. It is concluded that excitation leads to the eventual population of a photochemically important nonfluorescent excited state (I) which decays into a photoproduct (J625)‐ In J625, which is most probably a ground state molecule, the chromophore has undergone a structural change, presumably trans→ 13‐cis isomerization. It is suggested that the subsequent process reflects a relaxation of the protein environment involving proton transfer.",

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AU - Honig, B.

AU - Ottolenghi, M.

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N2 - Abstract— The sequence of primary events following light absorption by light adapted bacteriorhodopsin (bR570) is considered by analyzing recent picosecond absorption and emission data. The analysis is facilitated by theoretical calculations which allow us to characterize the properties of the first excited singlet state. It is concluded that excitation leads to the eventual population of a photochemically important nonfluorescent excited state (I) which decays into a photoproduct (J625)‐ In J625, which is most probably a ground state molecule, the chromophore has undergone a structural change, presumably trans→ 13‐cis isomerization. It is suggested that the subsequent process reflects a relaxation of the protein environment involving proton transfer.

AB - Abstract— The sequence of primary events following light absorption by light adapted bacteriorhodopsin (bR570) is considered by analyzing recent picosecond absorption and emission data. The analysis is facilitated by theoretical calculations which allow us to characterize the properties of the first excited singlet state. It is concluded that excitation leads to the eventual population of a photochemically important nonfluorescent excited state (I) which decays into a photoproduct (J625)‐ In J625, which is most probably a ground state molecule, the chromophore has undergone a structural change, presumably trans→ 13‐cis isomerization. It is suggested that the subsequent process reflects a relaxation of the protein environment involving proton transfer.

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ER -

ANALYSIS OF PRIMARY PHOTOCHEMICAL PROCESSES IN BACTERIORHODOPSIN

Abstract

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