9JJ8

Structural insights into the PSI-FCPI supercomplex from the coccolithophore Emiliania huxleyi

This is a non-PDB format compatible entry.

Summary for 9JJ8

• Entry DOI: 10.2210/pdb9jj8/pdb
• EMDB information: 61519
• Descriptor: Photosystem I P700 chlorophyll a apoprotein A1, Photosystem I reaction center subunit XII, PSI-K, ... (52 entities in total)
• Functional Keywords: psi-fcpi supercomplex, photosynthesis
• Biological source: Emiliania huxleyi CCMP1516; More
• Total number of polymer chains: 51
• Total formula weight: 1907798.59

Authors

Shen, L.L.,Li, Z.H.,Wang, W.D. (deposition date: 2024-09-13, release date: 2025-08-20, Last modification date: 2026-06-24)

Primary citation

Shen, L.,Ren, F.,Wang, Y.C.,Li, Z.,Zheng, M.,Li, X.,Fan, W.,Yang, Y.,Sang, M.,Liu, C.,Han, G.,Qin, S.,Fan, J.,Tian, L.,Kuang, T.,Shen, J.R.,Wang, W.
Structure and function of a huge photosystem I-fucoxanthin chlorophyll supercomplex from a coccolithophore.
Science, 389:eadv2132-eadv2132, 2025

PubMed 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 (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.

PubMed: 40934304
DOI: 10.1126/science.adv2132

Experimental method

ELECTRON MICROSCOPY (2.79 Å)