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Structure and function of a huge photosystem I-fucoxanthin chlorophyll supercomplex from a coccolithophore

作　　者：Shen LL#, Ren F#, Wang YC#, Li ZH#, Zheng MY#, Li XY, Fan WZ, Yang YY, Sang M, Liu C, Han GY, Qin S, Fan JH, Tian LJ*, Kuang TY, Shen JR, Wang WD*
影响因子：45.8
刊物名称：Science
出版年份：2025
卷：389  期：6765  页码：eadv2132

论文摘要：

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.
全文链接：https://www.science.org/doi/10.1126/science.adv2132
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