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-Structure paper
タイトル | Structural basis for energy harvesting and dissipation in a diatom PSII-FCPII supercomplex. |
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ジャーナル・号・ページ | Nat Plants, Vol. 5, Issue 8, Page 890-901, Year 2019 |
掲載日 | 2019年7月29日 |
著者 | Ryo Nagao / Koji Kato / Takehiro Suzuki / Kentaro Ifuku / Ikuo Uchiyama / Yasuhiro Kashino / Naoshi Dohmae / Seiji Akimoto / Jian-Ren Shen / Naoyuki Miyazaki / Fusamichi Akita / |
PubMed 要旨 | 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. |
リンク | Nat Plants / PubMed:31358960 |
手法 | EM (単粒子) |
解像度 | 3.3 - 3.8 Å |
構造データ | EMDB-9775, PDB-6j3y: |
化合物 | 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: |
由来 |
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キーワード | ELECTRON TRANSPORT / Photosystem |