Structure of the plant photosystem I supercomplex at 2.6 Å resolution
Structure of the plant photosystem I supercomplex at 2.6 Å resolution
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DOI：
10.1038/nplants.2017.14
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发表时间：
2017-03-01
期刊：
影响因子：
18
通讯作者：
Nelson, Nathan
中科院分区：
文献类型：
--
作者：
Mazor, Yuval;Borovikova, Anna;Nelson, Nathan
四种复杂的膜复合物进行含氧光合作用的光反应。光系统I （PSI）是两个大型反应中心之一，负责将光子转化为维持生命所需的化学能。在植物的类囊体膜中，PSI与其集成的光收集天线，光收集复合物I （LHCI）一起被发现在一个包含数百种光收集色素的膜超复合物中。本文报道了植物PSI-LHCI在2.6埃分辨率下的晶体结构。该结构揭示了PsaK的结构，PsaK是植物状态转变的重要核心亚基，围绕电子转移中心的水分子保守网络，以及桥接PSI及其LHCI天线的脂质精细结构。我们讨论了结构对能量传递和PSI演化的影响。
Four elaborate membrane complexes carry out the light reaction of oxygenic photosynthesis. Photosystem I ( PSI) is one of two large reaction centres responsible for converting light photons into the chemical energy needed to sustain life. In the thylakoid membranes of plants, PSI is found together with its integral light-harvesting antenna, light-harvesting complex I (LHCI), in a membrane supercomplex containing hundreds of light-harvesting pigments. Here, we report the crystal structure of plant PSI-LHCI at 2.6 angstrom resolution. The structure reveals the configuration of PsaK, a core subunit important for state transitions in plants, a conserved network of water molecules surrounding the electron transfer centres and an elaborate structure of lipids bridging PSI and its LHCI antenna. We discuss the implications of the structure for energy transfer and the evolution of PSI.