Theoretical Study of the Environment Effect on Excitation Energy Transfer in Photosynthetic Light Harvesting System
Theoretical Study of the Environment Effect on Excitation Energy Transfer in Photosynthetic Light Harvesting System
复制标题
环境对光合光采集系统激发能量转移影响的理论研究
DOI：
10.1021/acs.jpcb.0c00266
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发表时间：
2020
影响因子：
3.3
通讯作者：
JianHua Wei
中科院分区：
文献类型：
--
作者：
XueYan Cui;YiJing Yan;JianHua Wei
近年来，二维电子光谱实验证明，光合作用捕光系统中的激发能量传递(EET)呈现长寿命的电子量子拍频信号。自在捕光系统中被发现后，量子相干效应引起了广泛的讨论。为了说明Fenna-Matthews-Olson(FMO)和藻蓝蛋白645(PC645)复合体中的EET过程，局部蛋白质环境通常被认为是相同的；然而，这对捕光复合体的实际结构分析是矛盾的。采用耗散运动方程理论，给出了非均相蛋白质环境对能量传递过程的影响，并给出了精确的数值结果。我们证明了能量传递过程依赖于FMO复合体的局部非均匀环境。对于PC645复合体，也发现了类似的良好协议。此外，我们还讨论了通过控制环境特性，不同发色团在激发能量传递过程中的最佳值。
In recent years, two-dimensional (2D) electronic spectroscopy experiments prove that the excitation energy transfer (EET) in photosynthetic light-harvesting systems presents long-lived electronic quantum beating signals. After being discovered in the light-harvesting system, the quantum coherence effect has aroused widespread discussion. To illustrate the EET process in the Fenna–Matthews–Olson (FMO) and phycocyanin 645 (PC645) complex, the local protein environment is often thought to be the same; however, this is ambivalent to the practical structural analysis of the light-harvesting complex. By adopting the dissipaton equation of motion theory, we present the effect of a heterogeneous protein environment on the energy transfer process with accurate numerical results. We demonstrate that the energy transfer process relies on the local heterogeneous environment for the FMO complex. A similar good agreement is found for the PC645 complex. Furthermore, we discuss the optimal value of different chromophores in the excitation energy transfer process by controlling the environmental characteristics.