Structure, assembly and energy transfer of plant photosystem II supercomplex
Structure, assembly and energy transfer of plant photosystem II supercomplex
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植物光系统II超级复合体的结构、组装和能量传递
DOI：
10.1016/j.bbabio.2018.03.007
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发表时间：
2018-09-01
影响因子：
4.3
通讯作者：
Li, Mei
中科院分区：
文献类型：
--
作者：
Cao, Peng;Su, Xiaodong;Li, Mei
在光系统II（PSII）周围，外围天线系统吸收太阳光能量并将其转移到核心复合物，在那里发生水分解和氧释放反应。植物的外周触角由多种捕光复合物II（LHCII）组成。最近，C2 S2 M2型PSII-LHCII超复合物的三维结构从豌豆（PsPSII）已解决了在2.7埃分辨率使用单粒子冷冻电子显微镜方法。大的同二聚体超复合物具有> 1400 kDa的总分子量。每个单体具有被强烈和适度结合的LHCII三聚体以及CP 29、CP 26和CP 24单体包围的核心复合物。在这里，我们回顾并提出了详细的分析，这种超分子机械的结构特征。具体地说，我们讨论了不同物种的PSII放氧中心周围的结构差异。此外，我们总结了现有的知识的结构和周边天线复合物的位置，并剖析了激发能量从周边天线的核心复合物的转移途径。这些详细的高分辨率结构信息为理解植物PSII-LHCII超复合物的功能行为提供了坚实的基础。
Around photosystem II (PSII), the peripheral antenna system absorbs sunlight energy and transfers it to the core complex where the water-splitting and oxygen-evolving reaction takes place. The peripheral antennae in plants are composed of various light-harvesting complexes II (LHCII). Recently, the three-dimensional structure of the C2S2M2-type PSII-LHCII supercomplex from Pisum sativum (PsPSII) has been solved at 2.7-angstrom resolution using the single-particle cryo-electron microscopy method. The large homodimeric supercomplex has a total molecular weight of > 1400 kDa. Each monomer has a core complex surrounded by strongly and moderately bound LHCII trimers, as well as CP29, CP26, and CP24 monomers. Here, we review and present a detailed analysis of the structural features of this supramolecular machinery. Specifically, we discuss the structural differences around the oxygen-evolving center of PSII from different species. Furthermore, we summarize the existing knowledge of the structures and locations of peripheral antenna complexes, and dissect the excitation energy transfer pathways from the peripheral antennae to the core complex. This detailed high-resolution structural information provides a solid basis for understanding the functional behavior of plant PSII-LHCII supercomplex.