Photosynthesis is a fundamental biological process involving the conversion of solar energy into chemical energy. The initial photochemical and photophysical events of photosynthesis are mediated by photosystem II (PSII) and photosystem I (PSI). Both PSII and PSI are multi-subunit supramolecular machineries composed of a core complex and a peripheral antenna system. The antenna system serves to capture light energy and transfer it to the core efficiently. Both PSII and PSI in the green lineage (plants and green algae) and PSI in red algae have an antenna system comprising a series of chlorophyll- and carotenoid-binding membrane proteins belonging to the light-harvesting complex (LHC) superfamily, including LHCII and LHCI. However, the antenna size and subunit composition vary considerably in the two photosystems from diverse organisms. On the basis of the plant and algal LHCII and LHCI structures that have been solved by X-ray crystallography and single-particle cryo-electron microscopy we review the detailed structural features and characteristic pigment properties of these LHCs in PSII and PSI. This article is part of a Special Issue entitled Light harvesting, edited by Dr. Roberta Croce.

中文翻译：

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结构分析和捕光配合物I和II的比较。

光合作用是一个基本的生物过程，涉及将太阳能转换为化学能。光合作用的初始光化学和光物理事件是由光系统II（PSII）和光系统I（PSI）介导的。PSII和PSI都是由核心复合体和外围天线系统组成的多亚单位超分子机器。天线系统用于捕获光能并将其有效传输到核心。绿系（植物和绿藻）中的PSII和PSI和红藻中的PSI都具有一个天线系统，该天线系统包含一系列属于光捕获复合体（LHC）超家族的叶绿素和类胡萝卜素结合膜蛋白，包括LHCII和LHCI。然而，在来自不同生物体的两个光系统中，天线尺寸和亚基组成差异很大。基于X射线晶体学和单粒子低温电子显微镜已解决的植物和藻类LHCII和LHCI结构，我们综述了PSII和PSI中这些LHC的详细结构特征和特征性颜料性质。本文是Roberta Croce博士编辑的《光的收获》特刊的一部分。