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Structural basis for energy transfer in a huge diatom PSI-FCPI supercomplex

Author

Listed:
  • Caizhe Xu

    (The Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Xiong Pi

    (Tsinghua University)

  • Yawen Huang

    (Tsinghua University)

  • Guangye Han

    (The Chinese Academy of Sciences)

  • Xiaobo Chen

    (The Chinese Academy of Sciences
    Hebei University of Science and Technology)

  • Xiaochun Qin

    (University of Jinan)

  • Guoqiang Huang

    (Tsinghua University)

  • Songhao Zhao

    (The Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yanyan Yang

    (The Chinese Academy of Sciences)

  • Tingyun Kuang

    (The Chinese Academy of Sciences)

  • Wenda Wang

    (The Chinese Academy of Sciences)

  • Sen-Fang Sui

    (Tsinghua University
    Southen University of Science and Technology)

  • Jian-Ren Shen

    (The Chinese Academy of Sciences
    Okayama University)

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 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.

Suggested Citation

  • 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, 2020. "Structural basis for energy transfer in a huge diatom PSI-FCPI supercomplex," Nature Communications, Nature, vol. 11(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18867-x
    DOI: 10.1038/s41467-020-18867-x
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    Cited by:

    1. Senjie Lin & Shuaishuai Wu & Jiamin He & Xiaoyu Wang & Arthur R. Grossman, 2024. "Shining light on dinoflagellate photosystem I," Nature Communications, Nature, vol. 15(1), pages 1-4, December.
    2. Koji Kato & Ryo Nagao & Yoshifumi Ueno & Makio Yokono & Takehiro Suzuki & Tian-Yi Jiang & Naoshi Dohmae & Fusamichi Akita & Seiji Akimoto & Naoyuki Miyazaki & Jian-Ren Shen, 2022. "Structure of a tetrameric photosystem I from a glaucophyte alga Cyanophora paradoxa," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    3. 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, 2023. "Structural insights into photosystem II supercomplex and trimeric FCP antennae of a centric diatom Cyclotella meneghiniana," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    4. Long-Sheng Zhao & Ning Wang & Kang Li & Chun-Yang Li & Jian-Ping Guo & Fei-Yu He & Gui-Ming Liu & Xiu-Lan Chen & Jun Gao & Lu-Ning Liu & Yu-Zhong Zhang, 2024. "Architecture of symbiotic dinoflagellate photosystem I–light-harvesting supercomplex in Symbiodinium," Nature Communications, Nature, vol. 15(1), pages 1-13, December.

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