Modeling of exciton quenching in photosystem II.
Modeling of exciton quenching in photosystem II.
复制标题
光系统 II 中激子猝灭的建模。
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Ruban
中科院分区：
文献类型：
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作者：
L. Valkunas;G. Trinkunas;J. Chmeliov;A. Ruban
激发能量转移和捕获的人工假设的陷阱在光系统II（PSII）的粗粒度模型进行了建模。该模型是基于这样的假设，即在色素-蛋白质复合物内的激发能量转移比复合物间的激发能量转移快得多。因此，激发能量转移和捕获率的反应中心（RC）被重新缩放的相关熵因子和一个额外的捕获率的一个特定的色素-蛋白质复合物负责的非光化学猝灭（NPQ）必须纳入理论框架。对于分析，考虑PSII的二聚体模型。NPQ陷阱的激发淬灭的效率，取决于它们的定位和捕获率，进行了分析。得出的结论是，NPQ猝灭剂的最高效率可以实现时，它们被定位在主要的捕光复合物，LHCII，在这种状态下的激发弛豫是快速的，皮秒的顺序，甚至更快。国家负责NPQ的起源进行了讨论。
Excitation energy transfer and trapping by the artificially postulated traps in photosystem II (PSII) were modeled in terms of a coarse-grained model. The model is based on the assumption that the excitation energy transfer within a pigment-protein complex is much faster than the intercomplex excitation energy transfer. As a result, the excitation energy transfer and trapping rates by the reaction center (RC) were rescaled by the relevant entropic factors and an additional trapping rate for a specific pigment-protein complex responsible for the non-photochemical quenching (NPQ) had to be included into the theoretical framework. For the analysis, dimeric models of PSII were considered. The efficiency of the excitation quenching by the NPQ traps, depending on their positioning and on the trapping rate, was analyzed. It was concluded that the highest efficiency of the NPQ quencher could be achieved when they are localized in the major light-harvesting complexes, LHCII, and the excitation relaxation in this state is fast, of the order of picoseconds and even faster. The origin of the state responsible for NPQ is discussed.