Charge separation in the photosystem II reaction center resolved by multispectral two-dimensional electronic spectroscopy
| العنوان: | Charge separation in the photosystem II reaction center resolved by multispectral two-dimensional electronic spectroscopy |
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| المؤلفون: | Hoang H. Nguyen, Yin Song, Elizabeth L. Maret, Yogita Silori, Rhiannon Willow, Charles F. Yocum, Jennifer P. Ogilvie |
| المصدر: | Science Advances. 9 |
| بيانات النشر: | American Association for the Advancement of Science (AAAS), 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | Chemical Physics (physics.chem-ph), Multidisciplinary, Biological Physics (physics.bio-ph), Physics - Chemical Physics, FOS: Physical sciences, Physics - Biological Physics |
| الوصف: | The photosystem II reaction center (PSII-RC) performs the primary energy conversion steps of oxygenic photosynthesis. While the PSII-RC has been studied extensively, the similar timescales of energy transfer and charge separation, and the severely overlapping pigment transitions in the Qy region have led to multiple models of its charge separation mechanism and excitonic structure. Here we combine two-dimensional electronic spectroscopy (2DES) with a continuum probe and two-dimensional electronic vibrational spectroscopy (2DEV) to study the cyt b559-D1D2 PSII-RC at 77K. This multispectral combination correlates the overlapping Qy excitons with distinct anion and pigment-specific Qx and mid-IR transitions to resolve the charge separation mechanism and excitonic structure. Through extensive simultaneous analysis of the multispectral 2D data we find that charge separation proceeds on multiple timescales from a highly delocalized excited state via a single pathway in which PheoD1 is the primary electron acceptor, while ChlD1 and PD1 act in concert as the primary electron donor. 20 pages, 6 figures |
| تدمد: | 2375-2548 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df8ea29fdc6301818e8bd07cb5fb4707 https://doi.org/10.1126/sciadv.ade7190 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....df8ea29fdc6301818e8bd07cb5fb4707 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 23752548 |
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