本文报道了huxleyi （Emiliania huxleyi）球石藻（cocolithophore）的PSI-岩藻黄素叶绿素a/c结合蛋白（FCPI）超复合物的结构，该复合物在2.79埃分辨率下显示了一个巨大的Eh-PSI-FCPI超复合物，除了PSI核心外，还包含38个外围Eh-FCPI天线和一个连接蛋白（EhLP）。在Eh-PSI-FCPI中发现了819个色素网络，其捕获和转移光能的量子效率为95%。这阐明了其模块化Eh-FCPI安排如何有助于扩大PSI横截面和有效的光收集。
研究人员表示，光系统I （PSI）是一种色素蛋白复合物，在光合作用中将光能转化为化学能。在光合生物中，PSI-LHC（光收集复合体）结构在大小上表现出很大的差异，反映了对不同光环境的适应。
附：英文原文
Title: Structure and function of a huge photosystem I–fucoxanthin chlorophyll supercomplex from a coccolithophore
Author: Lili Shen, Fei Ren, Yin-Chu Wang, Zhenhua Li, Mengyuan Zheng, Xiaoyi Li, Wenzheng Fan, Yanyan Yang, Min Sang, Cheng Liu, Guangye Han, Song Qin, Jianhua Fan, Lijin Tian, Tingyun Kuang, Jian-Ren Shen, Wenda Wang
Issue&Volume: 2025-09-11
Abstract: Photosystem I (PSI) is a pigment-protein complex, which converts light energy into chemical energy in photosynthesis. Among photosynthetic organisms, PSI-LHC (light-harvesting complex) structures exhibit substantial differences in their sizes, reflecting adaptation to different light environments. Here we report the structure of a PSI-fucoxanthin chlorophyll a/c binding protein (FCPI) supercomplex from the coccolithophore Emiliania huxleyi (Eh) at 2.79-angstrom resolution by cryo–electron microscopy, which showed a huge Eh-PSI-FCPI supercomplex containing 38 peripheral Eh-FCPI antennae and a linker protein (EhLP) in addition to the PSI core. A network of 819 pigments was found in Eh-PSI-FCPI, which functions to capture and transfer light energy with 95% quantum efficiency. This elucidates how its modular Eh-FCPI arrangement contributes to the expansion of PSI cross section and efficient light harvesting.
DOI: adv2132
Source: https://www.science.org/doi/10.1126/science.adv2132