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Structure of the red-shifted Fittonia albivenis photosystem I

Author

Listed:
  • Xiuxiu Li

    (University of Jinan)

  • Guoqiang Huang

    (Tsinghua University
    Fudan University)

  • Lixia Zhu

    (University of Jinan)

  • Chenyang Hao

    (University of Jinan)

  • Sen-Fang Sui

    (Tsinghua University
    Southern University of Science and Technology)

  • Xiaochun Qin

    (University of Jinan)

Abstract

Photosystem I (PSI) from Fittonia albivenis, an Acanthaceae ornamental plant, is notable among green plants for its red-shifted emission spectrum. Here, we solved the structure of a PSI–light harvesting complex I (LHCI) supercomplex from F. albivenis at 2.46-Å resolution using cryo-electron microscopy. The supercomplex contains a core complex of 14 subunits and an LHCI belt with four antenna subunits (Lhca1–4) similar to previously reported angiosperm PSI–LHCI structures; however, Lhca3 differs in three regions surrounding a dimer of low-energy chlorophylls (Chls) termed red Chls, which absorb far-red beyond visible light. The unique amino acid sequences within these regions are exclusively shared by plants with strongly red-shifted fluorescence emission, suggesting candidate structural elements for regulating the energy state of red Chls. These results provide a structural basis for unraveling the mechanisms of light harvest and transfer in PSI–LHCI of under canopy plants and for designing Lhc to harness longer-wavelength light in the far-red spectral range.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50655-9
    DOI: 10.1038/s41467-024-50655-9
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    References listed on IDEAS

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    1. Dvir Harris & Hila Toporik & Gabriela S. Schlau-Cohen & Yuval Mazor, 2023. "Energetic robustness to large scale structural fluctuations in a photosynthetic supercomplex," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. 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.
    3. Christina Lunde & Poul Erik Jensen & Anna Haldrup & Juergen Knoetzel & Henrik Vibe Scheller, 2000. "The PSI-H subunit of photosystem I is essential for state transitions in plant photosynthesis," Nature, Nature, vol. 408(6812), pages 613-615, November.
    4. Alexey Amunts & Omri Drory & Nathan Nelson, 2007. "The structure of a plant photosystem I supercomplex at 3.4 Å resolution," Nature, Nature, vol. 447(7140), pages 58-63, May.
    5. Adam Ben-Shem & Felix Frolow & Nathan Nelson, 2003. "Crystal structure of plant photosystem I," Nature, Nature, vol. 426(6967), pages 630-635, December.
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