National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, 100101, China.
College of Life Sciences, University of Chinese Academy of Sciences, 19(A) Yuquan Road, Shijingshan District, Beijing, 100049, China.
Plant Cell Physiol. 2021 Oct 29;62(7):1108-1120. doi: 10.1093/pcp/pcab072.
Photosynthesis is the process conducted by plants and algae to capture photons and store their energy in chemical forms. The light-harvesting, excitation transfer, charge separation and electron transfer in photosystem II (PSII) are the critical initial reactions of photosynthesis and thereby largely determine its overall efficiency. In this review, we outline the rapidly accumulating knowledge about the architectures and assemblies of plant and green algal PSII-light harvesting complex II (LHCII) supercomplexes, with a particular focus on new insights provided by the recent high-resolution cryo-electron microscopy map of the supercomplexes from a green alga Chlamydomonas reinhardtii. We make pair-wise comparative analyses between the supercomplexes from plants and green algae to gain insights about the evolution of the PSII-LHCII supercomplexes involving the peripheral small PSII subunits that might have been acquired during the evolution and about the energy transfer pathways that define their light-harvesting and photoprotective properties.
光合作用是植物和藻类进行的将光子捕获并将其能量以化学形式储存的过程。在光合作用中，光捕获、激发能传递、电荷分离和电子转移在光系统 II（PSII）中进行，这些是光合作用的关键初始反应，因此在很大程度上决定了光合作用的整体效率。在这篇综述中，我们概述了关于植物和绿藻 PSII-光捕获复合物 II（LHCII）超复合体的结构和组装的快速积累的知识，特别关注最近来自绿藻衣藻的超复合体的高分辨率冷冻电子显微镜图谱提供的新见解。我们对来自植物和绿藻的超复合体进行了两两比较分析，以深入了解 PSII-LHCII 超复合体的进化，包括可能在进化过程中获得的外围小 PSII 亚基，以及定义其光捕获和光保护特性的能量转移途径。
