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-Structure paper
Title | Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits. |
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Journal, issue, pages | Nat Plants, Vol. 5, Issue 3, Page 263-272, Year 2019 |
Publish date | Mar 8, 2019 |
Authors | Xiaochun Qin / Xiong Pi / Wenda Wang / Guangye Han / Lixia Zhu / Mingmei Liu / Linpeng Cheng / Jian-Ren Shen / Tingyun Kuang / Sen-Fang Sui / |
PubMed Abstract | Photosystem I (PSI) is a highly efficient natural light-energy converter, and has diverse light-harvesting antennas associated with its core in different photosynthetic organisms. In green algae, an ...Photosystem I (PSI) is a highly efficient natural light-energy converter, and has diverse light-harvesting antennas associated with its core in different photosynthetic organisms. In green algae, an extremely large light-harvesting complex I (LHCI) captures and transfers energy to the PSI core. Here, we report the structure of PSI-LHCI from a green alga Bryopsis corticulans at 3.49 Å resolution, obtained by single-particle cryo-electron microscopy, which revealed 13 core subunits including subunits characteristic of both prokaryotes and eukaryotes, and 10 light-harvesting complex a (Lhca) antennas that form a double semi-ring and an additional Lhca dimer, including a novel four-transmembrane-helix Lhca. In total, 244 chlorophylls were identified, some of which were located at key positions for the fast energy transfer. These results provide a firm structural basis for unravelling the mechanisms of light-energy harvesting, transfer and quenching in the green algal PSI-LHCI, and important clues as to how PSI-LHCI has changed during evolution. |
External links | Nat Plants / PubMed:30850820 |
Methods | EM (single particle) |
Resolution | 3.49 Å |
Structure data | |
Chemicals | ChemComp-CLA: ChemComp-PQN: ChemComp-LHG: ChemComp-8CT: ChemComp-HTG: ChemComp-SF4: ChemComp-DGD: ChemComp-CHL: ChemComp-XAT: ChemComp-LMG: |
Source |
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Keywords | PLANT PROTEIN / PSI-LHCI |