Vibronic coherence in oxygenic photosynthesis.

Autor: Fuller FD; Department of Physics and Biophysics, University of Michigan, Ann Arbor, Michigan 48109, USA., Pan J; Department of Physics and Biophysics, University of Michigan, Ann Arbor, Michigan 48109, USA., Gelzinis A; 1] Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, 10222 Vilnius, Lithuania [2] Center for Physical Sciences and Technology, Gostauto 9, 01108 Vilnius, Lithuania., Butkus V; 1] Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, 10222 Vilnius, Lithuania [2] Center for Physical Sciences and Technology, Gostauto 9, 01108 Vilnius, Lithuania., Senlik SS; Department of Physics and Biophysics, University of Michigan, Ann Arbor, Michigan 48109, USA., Wilcox DE; Department of Physics and Biophysics, University of Michigan, Ann Arbor, Michigan 48109, USA., Yocum CF; Department of Molecular, Cellular and Developmental Biology and Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA., Valkunas L; 1] Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, 10222 Vilnius, Lithuania [2] Center for Physical Sciences and Technology, Gostauto 9, 01108 Vilnius, Lithuania., Abramavicius D; Department of Theoretical Physics, Faculty of Physics of Vilnius University, Sauletekio Avenue 9, 10222 Vilnius, Lithuania., Ogilvie JP; Department of Physics and Biophysics, University of Michigan, Ann Arbor, Michigan 48109, USA.
Jazyk: angličtina
Zdroj: Nature chemistry [Nat Chem] 2014 Aug; Vol. 6 (8), pp. 706-11. Date of Electronic Publication: 2014 Jul 13.
DOI: 10.1038/nchem.2005
Abstrakt: Photosynthesis powers life on our planet. The basic photosynthetic architecture consists of antenna complexes that harvest solar energy and reaction centres that convert the energy into stable separated charge. In oxygenic photosynthesis, the initial charge separation occurs in the photosystem II reaction centre, the only known natural enzyme that uses solar energy to split water. Both energy transfer and charge separation in photosynthesis are rapid events with high quantum efficiencies. In recent nonlinear spectroscopic experiments, long-lived coherences have been observed in photosynthetic antenna complexes, and theoretical work suggests that they reflect underlying electronic-vibrational resonances, which may play a functional role in enhancing energy transfer. Here, we report the observation of coherent dynamics persisting on a picosecond timescale at 77 K in the photosystem II reaction centre using two-dimensional electronic spectroscopy. Supporting simulations suggest that the coherences are of a mixed electronic-vibrational (vibronic) nature and may enhance the rate of charge separation in oxygenic photosynthesis.
Databáze: MEDLINE
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