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-Structure paper
タイトル | Structural insights into photosystem II supercomplex and trimeric FCP antennae of a centric diatom Cyclotella meneghiniana. |
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ジャーナル・号・ページ | Nat Commun, Vol. 14, Issue 1, Page 8164, Year 2023 |
掲載日 | 2023年12月9日 |
著者 | Songhao Zhao / Lili Shen / Xiaoyi Li / Qiushuang Tao / Zhenhua Li / Caizhe Xu / Cuicui Zhou / Yanyan Yang / Min Sang / Guangye Han / Long-Jiang Yu / Tingyun Kuang / Jian-Ren Shen / Wenda Wang / |
PubMed 要旨 | Diatoms are dominant marine algae and contribute around a quarter of global primary productivity, the success of which is largely attributed to their photosynthetic capacity aided by specific ...Diatoms are dominant marine algae and contribute around a quarter of global primary productivity, the success of which is largely attributed to their photosynthetic capacity aided by specific fucoxanthin chlorophyll-binding proteins (FCPs) to enhance the blue-green light absorption under water. We purified a photosystem II (PSII)-FCPII supercomplex and a trimeric FCP from Cyclotella meneghiniana (Cm) and solved their structures by cryo-electron microscopy (cryo-EM). The structures reveal detailed organizations of monomeric, dimeric and trimeric FCP antennae, as well as distinct assemblies of Lhcx6_1 and dimeric FCPII-H in PSII core. Each Cm-PSII-FCPII monomer contains an Lhcx6_1, an FCP heterodimer and other three FCP monomers, which form an efficient pigment network for harvesting energy. More diadinoxanthins and diatoxanthins are found in FCPs, which may function to quench excess energy. The trimeric FCP contains more chlorophylls c and fucoxanthins. These diversified FCPs and PSII-FCPII provide a structural basis for efficient light energy harvesting, transfer, and dissipation in C. meneghiniana. |
リンク | Nat Commun / PubMed:38071196 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.72 - 3.48 Å |
構造データ | EMDB-35987, PDB-8j5k: EMDB-36054, PDB-8j7z: EMDB-37267, PDB-8w4o: EMDB-37268, PDB-8w4p: |
化合物 | ChemComp-OEX: ChemComp-FE2: ChemComp-CLA: ChemComp-PHO: ChemComp-BCR: ChemComp-SQD: ChemComp-PL9: ChemComp-LHG: ChemComp-LMG: ChemComp-CL: ChemComp-DGD: ChemComp-BCT: ChemComp-HEM: ChemComp-A86: ChemComp-ET4: ChemComp-DD6: ChemComp-KC2: ChemComp-KC1: |
由来 |
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キーワード | PHOTOSYNTHESIS / PSII-FCPII supercomplex / Cm-FCP-trimer / PSII-FCPII |