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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.
Organizational Affiliation:
State Key Laboratory of Forage Breeding-by-Design and Utilization, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
University of Chinese Academy of Science, Yuquan Rd, Shijingshan District, Beijing, China.
Key Laboratory of Coastal Biology and Biological Resource Utilization, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, China.
National Basic Science Data Center, Beijing, China.
China National Botanical Garden, Beijing, China.
Academician Workstation of Agricultural High-Tech Industrial Area of the Yellow River Delta, National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying, China.
School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi, China.
Research Institute for Interdisciplinary Science, Advanced Research Field, Graduate School of Environmental, Life, Natural Science and Technology, Okayama University, Okayama, Japan.
AF [auth i] EF [auth j] HF [auth l] LE [auth b] LF [auth l]
AF [auth i], EF [auth j], HF [auth l], LE [auth b], LF [auth l], MDA [auth h], ME [auth b], MF [auth l], NE [auth b], OC [auth a], OE [auth b], OF [auth m], PC [auth a], PE [auth b], QC [auth a], RC [auth a], RE [auth b], SF [auth k], VE [auth f], YE [auth f]
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