Ultrafast spectroscopy of the electron transfer in photosynthetic reaction centres: towards a better understanding of electron transfer in biological systems
Ultrafast spectroscopy of the electron transfer in photosynthetic reaction centres: towards a better understanding of electron transfer in biological systems
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光合反应中心电子转移的超快光谱：更好地理解生物系统中的电子转移
DOI：
10.1098/rsta.1998.0176
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Wachtveitl
中科院分区：
文献类型：
--
作者：
W. Zinth;P. Huppmann;T. Arlt;J. Wachtveitl
飞秒光谱表明，在光合反应中心的初级电子转移是一个超快的逐步反应，其中电子是通过一个色素链转移。在第一个反应步骤中，电子从特殊对转移到辅助细菌叶绿素，时间常数约为。3便士。第二个亚皮秒反应将电子带到细菌脱镁叶绿素，然后在200 ps内到达醌QA。天然和突变的反应中心的实验产生的能量，重组能量和电子耦合的反应中心的信息。一致的理论处理的数据表明，标准的非绝热理论很好地描述了在室温下的初级电子转移过程。然而，对于一个特殊的快速反应突变体在低温下，非绝热理论的极限可能会达到。
Femtosecond spectroscopy shows that primary electron transfer in photosynthetic reaction centres is an ultrafast stepwise reaction where the electron is transferred via a chain of pigments. In a first reaction step, the electron is transferred from the special pair to the accessory bacteriochlorophyll with a time constant of ca. 3 ps. A second, subpicosecond reaction carries the electron to a bacteriopheophytin before it reaches the quinone QA within 200 ps. Experiments on native and mutated reaction centres yield information on energetics, reorganization energies and electronic coupling of the reaction centre. A consistent theoretical treatment of the data shows that standard non–adiabatic theory describes well the primary electron transfer process at room temperature. However, for a special fast reacting mutant at low temperatures, the limits of non–adiabatic theory may be reached.