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  Quantum Mechanics/Molecular Mechanics Study on the Photoreactions of Dark- and Light-Adapted States of a Blue-Light YtvA LOV Photoreceptor

Chang, X.-P., Gao, Y.-J., Fang, W.-H., Cui, G., & Thiel, W. (2017). Quantum Mechanics/Molecular Mechanics Study on the Photoreactions of Dark- and Light-Adapted States of a Blue-Light YtvA LOV Photoreceptor. Angewandte Chemie International Edition, 56(32), 9341-9345. doi:10.1002/anie.201703487.

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 Urheber:
Chang, Xue-Ping1, Autor
Gao, Yuan-Jun1, Autor
Fang, Wei-Hai1, Autor
Cui, Ganglong1, Autor
Thiel, Walter2, Autor           
Affiliations:
1College of Chemistry, Beijing Normal University, Xin-Jie-Kou Outer St. 19, 100875 Beijing (China), ou_persistent22              
2Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445590              

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Schlagwörter: ab inito calculations; chromophores; photobiology; photochemistry; proteins
 Zusammenfassung: The dark- and light-adapted states of YtvA LOV domains exhibit distinct excited-state behavior. We have employed high-level QM(MS-CASPT2)/MM calculations to study the photochemical reactions of the dark- and light-adapted states. The photoreaction from the dark-adapted state starts with an S1→T1 intersystem crossing followed by a triplet-state hydrogen transfer from the thiol to the flavin moiety that produces a diradical intermediate, and a subsequent internal conversion that triggers a barrierless C−S bond formation in the S0 state. The energy profiles for these transformations are different for the four conformers of the dark-adapted state considered. The photochemistry of the light-adapted state does not involve the triplet state: photoexcitation to the S1 state triggers C−S bond cleavage followed by recombination in the S0 state; both these processes are essentially barrierless and thus ultrafast. The present work offers new mechanistic insights into the photoresponse of flavin-containing blue-light photoreceptors.

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Sprache(n): eng - English
 Datum: 2017-05-302017-04-042017-06-202017-07-102017-08-01
 Publikationsstatus: Erschienen
 Seiten: 5
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1002/anie.201703487
 Art des Abschluß: -

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Titel: Angewandte Chemie International Edition
  Andere : Angew. Chem., Int. Ed.
  Andere : Angew. Chem. Int. Ed.
  Andere : Angewandte Chemie, International Edition
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Weinheim : Wiley-VCH
Seiten: - Band / Heft: 56 (32) Artikelnummer: - Start- / Endseite: 9341 - 9345 Identifikator: ISSN: 1433-7851
CoNE: https://pure.mpg.de/cone/journals/resource/1433-7851