Theoretical examination of quantum coherence in a photosynthetic system at physiological temperature
Theoretical examination of quantum coherence in a photosynthetic system at physiological temperature
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DOI：
10.1073/pnas.0908989106
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发表时间：
2009-10-13
影响因子：
11.1
通讯作者：
Fleming, Graham R.
中科院分区：
文献类型：
--
作者：
Ishizaki, Akihito;Fleming, Graham R.
对光合色素-蛋白质复合物 Fenna-Matthews-Olson (FMO) 复合物中长寿命电子相干性的观察表明，量子相干性可能在实现光合电子能量转移 (EET) 的显着效率方面发挥重要作用，尽管数据是在低温下获得的 [Engel GS, et al. 2017]。 (2007) 光合作用系统中通过量子相干性进行波状能量转移的证据。自然 446：782-786]。本文从理论上研究了生理温度下 EET 通过 FMO 复合体的时空动态。数值结果表明，即使在生理温度下，量子波状运动也能持续数百飞秒，并表明FMO复合体可以利用量子相干性和蛋白质支架调节的颜料能量景观，作为从外围光捕获天线到反应中心复合体的单向能量流的整流器。量子相干性的一个潜在作用是克服局部能量陷阱，并帮助面向反应中心复合体的颜料有效捕获电子能。
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.