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Proximity to Photosystem II is necessary for activation of Plastid Terminal Oxidase (PTOX) for photoprotection

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  • Pablo Ignacio Calzadilla

    (Faculty of Science and Engineering, University of Manchester)

  • Junliang Song

    (Faculty of Science and Engineering, University of Manchester)

  • Patrick Gallois

    (Medicine and Health, University of Manchester)

  • Giles Nicholas Johnson

    (Faculty of Science and Engineering, University of Manchester)

Abstract

The Plastid Terminal Oxidase (PTOX) is a chloroplast localized plastoquinone oxygen oxidoreductase suggested to have the potential to act as a photoprotective safety valve for photosynthesis. However, PTOX overexpression in plants has been unsuccessful at inducing photoprotection, and the factors that control its activity remain elusive. Here, we show that significant PTOX activity is induced in response to high light in the model species Eutrema salsugineum and Arabidopsis thaliana. This activation correlates with structural reorganization of the thylakoid membrane. Over-expression of PTOX in mutants of Arabidopsis thaliana perturbed in thylakoid stacking also results in such activity, in contrast to wild type plants with normal granal structure. Further, PTOX activation protects against photoinhibition of Photosystem II and reduces reactive oxygen production under stress conditions. We conclude that structural re-arrangements of the thylakoid membranes, bringing Photosystem II and PTOX into proximity, are both required and sufficient for PTOX to act as a Photosystem II sink and play a role in photoprotection.

Suggested Citation

  • Pablo Ignacio Calzadilla & Junliang Song & Patrick Gallois & Giles Nicholas Johnson, 2024. "Proximity to Photosystem II is necessary for activation of Plastid Terminal Oxidase (PTOX) for photoprotection," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44454-x
    DOI: 10.1038/s41467-023-44454-x
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    References listed on IDEAS

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    1. Thomas Pfannschmidt & Anders Nilsson & John F. Allen, 1999. "Photosynthetic control of chloroplast gene expression," Nature, Nature, vol. 397(6720), pages 625-628, February.
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