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The initial charge separation step in oxygenic photosynthesis.
Yoneda, Yusuke; Arsenault, Eric A; Yang, Shiun-Jr; Orcutt, Kaydren; Iwai, Masakazu; Fleming, Graham R.
Afiliación
  • Yoneda Y; Department of Chemistry, University of California, Berkeley, CA, 94720, United States.
  • Arsenault EA; Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, United States.
  • Yang SJ; Research Center of Integrative Molecular Systems, Institute for Molecular Science, National Institute of Natural Sciences, Okazaki, Aichi, 444-8585, Japan.
  • Orcutt K; Department of Chemistry, University of California, Berkeley, CA, 94720, United States.
  • Iwai M; Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, United States.
  • Fleming GR; Kavli Energy Nanoscience Institute at Berkeley, Berkeley, CA, 94720, United States.
Nat Commun ; 13(1): 2275, 2022 04 27.
Article en En | MEDLINE | ID: mdl-35477708
Photosystem II is crucial for life on Earth as it provides oxygen as a result of photoinduced electron transfer and water splitting reactions. The excited state dynamics of the photosystem II-reaction center (PSII-RC) has been a matter of vivid debate because the absorption spectra of the embedded chromophores significantly overlap and hence it is extremely difficult to distinguish transients. Here, we report the two-dimensional electronic-vibrational spectroscopic study of the PSII-RC. The simultaneous resolution along both the visible excitation and infrared detection axis is crucial in allowing for the character of the excitonic states and interplay between them to be clearly distinguished. In particular, this work demonstrates that the mixed exciton-charge transfer state, previously proposed to be responsible for the far-red light operation of photosynthesis, is characterized by the ChlD1+Phe radical pair and can be directly prepared upon photoexcitation. Further, we find that the initial electron acceptor in the PSII-RC is Phe, rather than PD1, regardless of excitation wavelength.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxígeno / Complejo de Proteína del Fotosistema II Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxígeno / Complejo de Proteína del Fotosistema II Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido