Theoretical examination of quantum coherence in a photosynthetic system at physiological temperature

被引:725
作者
Ishizaki, Akihito [1 ,2 ]
Fleming, Graham R. [1 ,2 ]
机构
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA
基金
日本学术振兴会;
关键词
photosynthesis; electronic energy transfer; quantum dynamics; FMO ANTENNA COMPLEXES; ENERGY-TRANSFER; BACTERIOCHLOROPHYLL PROTEIN; DYNAMICS; SPECTROSCOPY; RELAXATION; TEPIDUM;
D O I
10.1073/pnas.0908989106
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The observation of long-lived electronic coherence in a photosynthetic pigment-protein complex, the Fenna-Matthews-Olson (FMO) complex, is suggestive that quantum coherence might play a significant role in achieving the remarkable efficiency of photosynthetic electronic energy transfer (EET), although the data were acquired at cryogenic temperature [Engel GS, et al. (2007) Evidence for wavelike energy transfer through quantum coherence in photosynthetic systems. Nature 446: 782-786]. In this paper, the spatial and temporal dynamics of EET through the FMO complex at physiological temperature are investigated theoretically. The numerical results reveal that quantum wave-like motion persists for several hundred femtoseconds even at physiological temperature, and suggest that the FMO complex may work as a rectifier for unidirectional energy flow from the peripheral light-harvesting antenna to the reaction center complex by taking advantage of quantum coherence and the energy landscape of pigments tuned by the protein scaffold. A potential role of quantum coherence is to overcome local energetic traps and aid efficient trapping of electronic energy by the pigments facing the reaction center complex.
引用
收藏
页码:17255 / 17260
页数:6
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