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Title | Structural basis for energy transfer in a huge diatom PSI-FCPI supercomplex. |
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Journal, issue, pages | Nat Commun, Vol. 11, Issue 1, Page 5081, Year 2020 |
Publish date | Oct 8, 2020 |
Authors | Caizhe Xu / Xiong Pi / Yawen Huang / Guangye Han / Xiaobo Chen / Xiaochun Qin / Guoqiang Huang / Songhao Zhao / Yanyan Yang / Tingyun Kuang / Wenda Wang / Sen-Fang Sui / Jian-Ren Shen / |
PubMed Abstract | Diatom is an important group of marine algae and contributes to around 20% of the global photosynthetic carbon fixation. Photosystem I (PSI) of diatoms is associated with a large number of ...Diatom is an important group of marine algae and contributes to around 20% of the global photosynthetic carbon fixation. Photosystem I (PSI) of diatoms is associated with a large number of fucoxanthin-chlorophyll a/c proteins (FCPIs). We report the structure of PSI-FCPI from a diatom Chaetoceros gracilis at 2.38 Å resolution by single-particle cryo-electron microscopy. PSI-FCPI is a monomeric supercomplex consisting of 12 core and 24 antenna subunits (FCPIs), and 326 chlorophylls a, 34 chlorophylls c, 102 fucoxanthins, 35 diadinoxanthins, 18 β-carotenes and some electron transfer cofactors. Two subunits designated PsaR and PsaS were found in the core, whereas several subunits were lost. The large number of pigments constitute a unique and huge network ensuring efficient energy harvesting, transfer and dissipation. These results provide a firm structural basis for unraveling the mechanisms of light-energy harvesting, transfer and quenching in the diatom PSI-FCPI, and also important clues to evolutionary changes of PSI-LHCI. |
External links | Nat Commun / PubMed:33033236 / PubMed Central |
Methods | EM (single particle) |
Resolution | 2.38 Å |
Structure data | EMDB-30012, PDB-6ly5: |
Chemicals | ChemComp-DD6: ChemComp-A86: ChemComp-CLA: ChemComp-KC1: ChemComp-SQD: ChemComp-LMT: ChemComp-DGD: ChemComp-LHG: ChemComp-LMG: ChemComp-PQN: ChemComp-BCR: ChemComp-SF4: ChemComp-HOH: |
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Keywords | PHOTOSYNTHESIS / diatom / PSI-FCPI / photosysyem |