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Journal Article

The thylakoid proton antiporter KEA3 regulates photosynthesis in response to the chloroplast energy status

MPS-Authors
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Uflewski,  M.
Regulation of Photosynthesis, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Rindfleisch,  T.       
BioinformaticsCIG, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Korkmaz,  K.
Regulation of Photosynthesis, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Tietz,  E.
Regulation of Photosynthesis, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Mielke,  S.
Regulation of Photosynthesis, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Correa Galvis,  V.
Regulation of Photosynthesis, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Luzarowski,  M.
Small Molecules, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Skirycz,  A.
Small-Molecule Signalling, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Strand,  D.
Organelle Biology and Biotechnology, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Hertle,  A. P.
Organelle Biology and Biotechnology, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Walther,  D.       
BioinformaticsCIG, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Armbruster,  U.
Regulation of Photosynthesis, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Citation

Uflewski, M., Rindfleisch, T., Korkmaz, K., Tietz, E., Mielke, S., Correa Galvis, V., et al. (2024). The thylakoid proton antiporter KEA3 regulates photosynthesis in response to the chloroplast energy status. Nature Communications, 15: 2792. doi:10.1038/s41467-024-47151-5.


Cite as: https://hdl.handle.net/21.11116/0000-000F-1B03-0
Abstract
Plant photosynthesis contains two functional modules, the light-driven reactions in the thylakoid membrane and the carbon-fixing reactions in the chloroplast stroma. In nature, light availability for photosynthesis often undergoes massive and rapid fluctuations. Efficient and productive use of such variable light supply requires an instant crosstalk and rapid synchronization of both functional modules. Here, we show that this communication involves the stromal exposed C-terminus of the thylakoid K+-exchange antiporter KEA3, which regulates the ΔpH across the thylakoid membrane and therefore pH-dependent photoprotection. By combining in silico, in vitro, and in vivo approaches, we demonstrate that the KEA3 C-terminus senses the energy state of the chloroplast in a pH-dependent manner and regulates transport activity in response. Together our data pinpoint a regulatory feedback loop by which the stromal energy state orchestrates light capture and photoprotection via multi-level regulation of KEA3.