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Lhcx proteins provide photoprotection via thermal dissipation of absorbed light in the diatom Phaeodactylum tricornutum

Author

Listed:
  • Jochen M. Buck

    (University of Konstanz)

  • Jonathan Sherman

    (The State University of New Jersey)

  • Carolina Río Bártulos

    (University of Konstanz)

  • Manuel Serif

    (University of Konstanz)

  • Marc Halder

    (University of Konstanz)

  • Jan Henkel

    (University of Konstanz
    University of Bern)

  • Angela Falciatore

    (Laboratory of Computational and Quantitative Biology)

  • Johann Lavaud

    (Université Laval)

  • Maxim Y. Gorbunov

    (The State University of New Jersey)

  • Peter G. Kroth

    (University of Konstanz)

  • Paul G. Falkowski

    (The State University of New Jersey)

  • Bernard Lepetit

    (University of Konstanz
    University of Konstanz)

Abstract

Diatoms possess an impressive capacity for rapidly inducible thermal dissipation of excess absorbed energy (qE), provided by the xanthophyll diatoxanthin and Lhcx proteins. By knocking out the Lhcx1 and Lhcx2 genes individually in Phaeodactylum tricornutum strain 4 and complementing the knockout lines with different Lhcx proteins, multiple mutants with varying qE capacities are obtained, ranging from zero to high values. We demonstrate that qE is entirely dependent on the concerted action of diatoxanthin and Lhcx proteins, with Lhcx1, Lhcx2 and Lhcx3 having similar functions. Moreover, we establish a clear link between Lhcx1/2/3 mediated inducible thermal energy dissipation and a reduction in the functional absorption cross-section of photosystem II. This regulation of the functional absorption cross-section can be tuned by altered Lhcx protein expression in response to environmental conditions. Our results provide a holistic understanding of the rapidly inducible thermal energy dissipation process and its mechanistic implications in diatoms.

Suggested Citation

  • Jochen M. Buck & Jonathan Sherman & Carolina Río Bártulos & Manuel Serif & Marc Halder & Jan Henkel & Angela Falciatore & Johann Lavaud & Maxim Y. Gorbunov & Peter G. Kroth & Paul G. Falkowski & Berna, 2019. "Lhcx proteins provide photoprotection via thermal dissipation of absorbed light in the diatom Phaeodactylum tricornutum," Nature Communications, Nature, vol. 10(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12043-6
    DOI: 10.1038/s41467-019-12043-6
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    Cited by:

    1. Wu, Wenbo & Tan, Ling & Chang, Haixing & Zhang, Chaofan & Tan, Xuefei & Liao, Qiang & Zhong, Nianbing & Zhang, Xianming & Zhang, Yuanbo & Ho, Shih-Hsin, 2023. "Advancements on process regulation for microalgae-based carbon neutrality and biodiesel production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 171(C).
    2. 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.
    3. Audrey Short & Thomas P. Fay & Thien Crisanto & Ratul Mangal & Krishna K. Niyogi & David T. Limmer & Graham R. Fleming, 2023. "Kinetics of the xanthophyll cycle and its role in photoprotective memory and response," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    4. Liqiang Yang & Xiaotong He & Shaoguo Ru & Yongyu Zhang, 2024. "Herbicide leakage into seawater impacts primary productivity and zooplankton globally," Nature Communications, Nature, vol. 15(1), pages 1-17, December.

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