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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A MULTIMER MODEL FOR P680, THE PRIMARY ELECTRON DONOR OF PHOTOSYSTEM II
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A MULTIMER MODEL FOR P680, THE PRIMARY ELECTRON DONOR OF PHOTOSYSTEM II

机译：P680的多用户模型，光电系统II的主电子供体

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摘要

We consider a model of the photosystem II (PS II) reaction center in which its spectral properties result from weak ( approximate to 100 cm(-1)) excitonic interactions between the majority of reaction center chlorins. Such a model is consistent with a structure similar to that of the reaction center of purple bacteria but with a reduced coupling of the chlorophyll special pair. We find that this model is consistent with many experimental studies of PS II. The similarity in magnitude of the exciton coupling and energetic disorder in PS II results in the exciton states being structurally highly heterogeneous, This model suggests that P680, the primary electron donor of PS II, should not be considered a dimer but a multimer of several weakly coupled pigments, including the pheophytin electron acceptor. We thus conclude that even if the reaction center of PS II is structurally similar to that of purple bacteria, its spectroscopy and primary photochemistry may be very different. [References: 26]
机译：我们考虑一个光系统II（PS II）反应中心的模型，该模型的光谱特性是由大多数反应中心二氢卟酚之间的弱（约100 cm（-1））激子相互作用引起的。这种模型与紫色细菌反应中心的结构相似，但叶绿素特殊对的偶联减少。我们发现该模型与PS II的许多实验研究一致。 PS II中激子耦合和高能障碍的大小相似导致激子态在结构上高度异质。该模型表明，PS II的主要电子供体P680不应被视为二聚体，而应被视为弱几个的多聚体偶合颜料，包括脱镁叶绿素电子受体。因此，我们得出结论，即使PS II的反应中心在结构上类似于紫色细菌的反应中心，其光谱学和初级光化学也可能有很大不同。 [参考：26]

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