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Structural basis for assembly and function of a diatom photosystem I-light-harvesting supercomplex

Author

Listed:
  • Ryo Nagao

    (Okayama University)

  • Koji Kato

    (Okayama University)

  • Kentaro Ifuku

    (Kyoto University)

  • Takehiro Suzuki

    (RIKEN Center for Sustainable Resource Science)

  • Minoru Kumazawa

    (Kyoto University)

  • Ikuo Uchiyama

    (National Institutes of Natural Sciences)

  • Yasuhiro Kashino

    (University of Hyogo)

  • Naoshi Dohmae

    (RIKEN Center for Sustainable Resource Science)

  • Seiji Akimoto

    (Kobe University)

  • Jian-Ren Shen

    (Okayama University)

  • Naoyuki Miyazaki

    (Osaka University
    University of Tsukuba)

  • Fusamichi Akita

    (Okayama University
    PRESTO)

Abstract

Photosynthetic light-harvesting complexes (LHCs) play a pivotal role in collecting solar energy for photochemical reactions in photosynthesis. One of the major LHCs are fucoxanthin chlorophyll a/c-binding proteins (FCPs) present in diatoms, a group of organisms having important contribution to the global carbon cycle. Here, we report a 2.40-Å resolution structure of the diatom photosystem I (PSI)-FCPI supercomplex by cryo-electron microscopy. The supercomplex is composed of 16 different FCPI subunits surrounding a monomeric PSI core. Each FCPI subunit showed different protein structures with different pigment contents and binding sites, and they form a complicated pigment–protein network together with the PSI core to harvest and transfer the light energy efficiently. In addition, two unique, previously unidentified subunits were found in the PSI core. The structure provides numerous insights into not only the light-harvesting strategy in diatom PSI-FCPI but also evolutionary dynamics of light harvesters among oxyphototrophs.

Suggested Citation

  • Ryo Nagao & Koji Kato & Kentaro Ifuku & Takehiro Suzuki & Minoru Kumazawa & Ikuo Uchiyama & Yasuhiro Kashino & Naoshi Dohmae & Seiji Akimoto & Jian-Ren Shen & Naoyuki Miyazaki & Fusamichi Akita, 2020. "Structural basis for assembly and function of a diatom photosystem I-light-harvesting supercomplex," Nature Communications, Nature, vol. 11(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16324-3
    DOI: 10.1038/s41467-020-16324-3
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    Cited by:

    1. 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.
    2. 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.
    3. 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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