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A rapid aureochrome opto-switch enables diatom acclimation to dynamic light

Author

Listed:
  • Huan Zhang

    (Westlake University
    Westlake Institute for Advanced Study)

  • Xiaofeng Xiong

    (Westlake University)

  • Kangning Guo

    (Westlake University)

  • Mengyuan Zheng

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    China National Botanical Garden)

  • Tianjun Cao

    (Westlake University
    Westlake Institute for Advanced Study)

  • Yuqing Yang

    (Westlake University)

  • Jiaojiao Song

    (Westlake University)

  • Jie Cen

    (Westlake University)

  • Jiahuan Zhang

    (Westlake University)

  • Yanyou Jiang

    (Westlake University)

  • Shan Feng

    (Westlake University
    Westlake University)

  • Lijin Tian

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    China National Botanical Garden)

  • Xiaobo Li

    (Westlake University
    Westlake Institute for Advanced Study)

Abstract

Diatoms often outnumber other eukaryotic algae in the oceans, especially in coastal environments characterized by frequent fluctuations in light intensity. The identities and operational mechanisms of regulatory factors governing diatom acclimation to high light stress remain largely elusive. Here, we identified the AUREO1c protein from the coastal diatom Phaeodactylum tricornutum as a crucial regulator of non-photochemical quenching (NPQ), a photoprotective mechanism that dissipates excess energy as heat. AUREO1c detects light stress using a light-oxygen-voltage (LOV) domain and directly activates the expression of target genes, including LI818 genes that encode NPQ effector proteins, via its bZIP DNA-binding domain. In comparison to a kinase-mediated pathway reported in the freshwater green alga Chlamydomonas reinhardtii, the AUREO1c pathway exhibits a faster response and enables accumulation of LI818 transcript and protein levels to comparable degrees between continuous high-light and fluctuating-light treatments. We propose that the AUREO1c-LI818 pathway contributes to the resilience of diatoms under dynamic light conditions.

Suggested Citation

  • Huan Zhang & Xiaofeng Xiong & Kangning Guo & Mengyuan Zheng & Tianjun Cao & Yuqing Yang & Jiaojiao Song & Jie Cen & Jiahuan Zhang & Yanyou Jiang & Shan Feng & Lijin Tian & Xiaobo Li, 2024. "A rapid aureochrome opto-switch enables diatom acclimation to dynamic light," Nature Communications, Nature, vol. 15(1), pages 1-18, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49991-7
    DOI: 10.1038/s41467-024-49991-7
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    References listed on IDEAS

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