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Structure of photosystem I-LHCI-LHCII from the green alga Chlamydomonas reinhardtii in State 2

Author

Listed:
  • Zihui Huang

    (Zhejiang University School of Medicine)

  • Liangliang Shen

    (Institute of Botany, Chinese Academy of Sciences
    University of Chinese Academy of Science)

  • Wenda Wang

    (Institute of Botany, Chinese Academy of Sciences)

  • Zhiyuan Mao

    (Institute of Botany, Chinese Academy of Sciences
    University of Chinese Academy of Science)

  • Xiaohan Yi

    (Zhejiang University School of Medicine)

  • Tingyun Kuang

    (Institute of Botany, Chinese Academy of Sciences)

  • Jian-Ren Shen

    (Institute of Botany, Chinese Academy of Sciences
    Institute for Interdisciplinary Science, and Graduate School of Natural Science and Technology, Okayama University)

  • Xing Zhang

    (Zhejiang University School of Medicine
    Zhejiang University School of Medicine
    Zhejiang University Medical Center)

  • Guangye Han

    (Institute of Botany, Chinese Academy of Sciences)

Abstract

Photosystem I (PSI) and II (PSII) balance their light energy distribution absorbed by their light-harvesting complexes (LHCs) through state transition to maintain the maximum photosynthetic performance and to avoid photodamage. In state 2, a part of LHCII moves to PSI, forming a PSI-LHCI-LHCII supercomplex. The green alga Chlamydomonas reinhardtii exhibits state transition to a far larger extent than higher plants. Here we report the cryo-electron microscopy structure of a PSI-LHCI-LHCII supercomplex in state 2 from C. reinhardtii at 3.42 Å resolution. The result reveals that the PSI-LHCI-LHCII of C. reinhardtii binds two LHCII trimers in addition to ten LHCI subunits. The PSI core subunits PsaO and PsaH, which were missed or not well-resolved in previous Cr-PSI-LHCI structures, are observed. The present results reveal the organization and assembly of PSI core subunits, LHCI and LHCII, pigment arrangement, and possible pathways of energy transfer from peripheral antennae to the PSI core.

Suggested Citation

  • Zihui Huang & Liangliang Shen & Wenda Wang & Zhiyuan Mao & Xiaohan Yi & Tingyun Kuang & Jian-Ren Shen & Xing Zhang & Guangye Han, 2021. "Structure of photosystem I-LHCI-LHCII from the green alga Chlamydomonas reinhardtii in State 2," Nature Communications, Nature, vol. 12(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21362-6
    DOI: 10.1038/s41467-021-21362-6
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    Cited by:

    1. Xiuxiu Li & Guoqiang Huang & Lixia Zhu & Chenyang Hao & Sen-Fang Sui & Xiaochun Qin, 2024. "Structure of the red-shifted Fittonia albivenis photosystem I," Nature Communications, Nature, vol. 15(1), pages 1-14, December.

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