Cationic state distribution over the chlorophyll d-containing P(D1)/P(D2) pair in photosystem II
Cationic state distribution over the chlorophyll d-containing P(D1)/P(D2) pair in photosystem II
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光系统 II 中含叶绿素 d 的 P(D1)/P(D2) 对的阳离子态分布
DOI：
10.1016/j.bbabio.2011.12.003
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Ishikita H
中科院分区：
文献类型：
--
作者：
Saito K;Shen JR;Ishikita H
光系统II（PSII）中的叶绿素（Chl）辅因子主要是Chld，也存在少量Chla分子。探讨Chla可能参与A. marina，PD1·+/PD2·+电荷比使用在1.9-nm分辨率下分析的PSII晶体结构进行研究，同时考虑含Chld的PD1/PD2对的所有可能性，即，Chld/Chld、Chla/Chld和Chld/Chla对。Chld/Chld和Chla/Chld对导致相对于PD2·+的较大的PD1·+群体，如在来自其他物种的PSII中的Chla/Chla同源二聚体对中所鉴定的，细长热聚球藻然而，Chld/Chla对具有约50/50的PD 1·+/PD 2·+比率，这与先前对A.码头PSII。本研究结果强烈排除了Chld/Chla对在A中充当PD 1/PD 2的可能性。码头PSII。这篇文章是特刊的一部分，题为：光合作用研究的可持续性：从自然到人工。
Most of the chlorophyll (Chl) cofactors in photosystem II (PSII) from Acaryochloris marina are Chld, although a few Chla molecules are also present. To evaluate the possibility that Chla may participate in the PD1/PD2Chl pair in PSII from A. marina, the PD1•+/PD2•+charge ratio was investigated using the PSII crystal structure analyzed at 1.9-Å resolution, while considering all possibilities for the Chld-containing PD1/PD2pair, i.e., Chld/Chld, Chla/Chld, and Chld/Chla pairs. Chld/Chld and Chla/Chld pairs resulted in a large PD1•+population relative to PD2•+, as identified in Chla/Chla homodimer pairs in PSII from other species, e.g., Thermosynechococcus elongatus PSII. However, the Chld/Chla pair possessed a PD1•+/PD2•+ratio of approximately 50/50, which is in contrast to previous spectroscopic studies on A. marina PSII. The present results strongly exclude the possibility that the Chld/Chla pair serves as PD1/PD2in A. marina PSII. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial.