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Title | Structural basis for energy harvesting and dissipation in a diatom PSII-FCPII supercomplex. |
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Journal, issue, pages | Nat Plants, Vol. 5, Issue 8, Page 890-901, Year 2019 |
Publish date | Jul 29, 2019 |
![]() | Ryo Nagao / Koji Kato / Takehiro Suzuki / Kentaro Ifuku / Ikuo Uchiyama / Yasuhiro Kashino / Naoshi Dohmae / Seiji Akimoto / Jian-Ren Shen / Naoyuki Miyazaki / Fusamichi Akita / ![]() |
PubMed Abstract | Light-harvesting antenna systems in photosynthetic organisms harvest solar energy and transfer it to the photosynthetic reaction centres to initiate charge-separation and electron-transfer reactions. ...Light-harvesting antenna systems in photosynthetic organisms harvest solar energy and transfer it to the photosynthetic reaction centres to initiate charge-separation and electron-transfer reactions. Diatoms are one of the important groups of oxyphototrophs and possess fucoxanthin chlorophyll a/c-binding proteins (FCPs) as light harvesters. The organization and association pattern of FCP with the photosystem II (PSII) core are unknown. Here we solved the structure of PSII-FCPII supercomplexes isolated from a diatom, Chaetoceros gracilis, by single-particle cryoelectron microscopy. The PSII-FCPII forms a homodimer. In each monomer, two FCP homotetramers and three FCP monomers are associated with one PSII core. The structure reveals a highly complicated protein-pigment network that is different from the green-type light-harvesting apparatus. Comparing these two systems allows the identification of energy transfer and quenching pathways. These findings provide structural insights into not only excitation-energy transfer mechanisms in the diatom PSII-FCPII, but also changes of light harvesters between the red- and green-lineage oxyphototrophs during evolution. |
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Methods | EM (single particle) |
Resolution | 3.3 - 3.8 Å |
Structure data | EMDB-9775, PDB-6j3y: |
Chemicals | ![]() ChemComp-FE2: ![]() ChemComp-CLA: ![]() ChemComp-PHO: ![]() ChemComp-BCR: ![]() ChemComp-SQD: ![]() ChemComp-BCT: ![]() ChemComp-LHG: ![]() ChemComp-LMG: ![]() ChemComp-OEX: ![]() ChemComp-DGD: ![]() ChemComp-PL9: ![]() ChemComp-HEM: ![]() ChemComp-A86: ![]() ChemComp-LMU: |
Source |
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![]() | ELECTRON TRANSPORT / Photosystem |