Structure, Function, and Variations of the Photosystem I-Antenna Supercomplex from Different Photosynthetic Organisms.
Structure, Function, and Variations of the Photosystem I-Antenna Supercomplex from Different Photosynthetic Organisms.
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不同光合生物的光系统I-天线超级复合体的结构、功能和变化。
DOI：
10.1007/978-3-031-00793-4_11
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发表时间：
2022
影响因子：
--
通讯作者：
Jian
中科院分区：
文献类型：
--
作者：
Jian
光系统I(PSI)是一种蛋白质复合体，参与光合作用中铁还蛋白的光诱导电荷分离、电子转移和还原反应，最终导致固定二氧化碳所需的NAD(P)-还原为NAD(P)H。在真核藻类中，PSI与捕光复合体I(LHCI)亚单位结合，形成PSI-LHCI超复合体。LHCI收集光能并将其传输到PSI核心，在那里发生电荷分离和电子转移反应。在进化过程中，LHCI中蛋白质亚单位及其结合的色素的数量和序列因生物种类的不同而发生巨大变化，这是生物对不同光环境适应的结果。在这一章中，我将描述到目前为止用X射线结晶学或冷冻电子显微镜研究的不同生物的PSI-LHCI超复合体的结构，重点是不同生物中发现的与PSI核心相关的LHCI亚单位的数量、结构和结合模式的差异。
Photosystem I (PSI) is a protein complex functioning in light-induced charge separation, electron transfer, and reduction reactions of ferredoxin in photosynthesis, which finally results in the reduction of NAD(P)- to NAD(P)H required for the fixation of carbon dioxide. In eukaryotic algae, PSI is associated with light-harvesting complex I (LHCI) subunits, forming a PSI-LHCI supercomplex. LHCI harvests and transfers light energy to the PSI core, where charge separation and electron transfer reactions occur. During the course of evolution, the number and sequences of protein subunits and the pigments they bind in LHCI change dramatically depending on the species of organisms, which is a result of adaptation of organisms to various light environments. In this chapter, I will describe the structure of various PSI-LHCI supercomplexes from different organisms solved so far either by X-ray crystallography or by cryo-electron microscopy, with emphasis on the differences in the number, structures, and association patterns of LHCI subunits associated with the PSI core found in different organisms.