| Autor: |
Michal Uflewski, Tobias Rindfleisch, Kübra Korkmaz, Enrico Tietz, Sarah Mielke, Viviana Correa Galvis, Beatrix Dünschede, Marcin Luzarowski, Aleksandra Skirycz, Markus Schwarzländer, Deserah D. Strand, Alexander P. Hertle, Danja Schünemann, Dirk Walther, Anja Thalhammer, Martin Wolff, Ute Armbruster |
| Rok vydání: |
2022 |
| Popis: |
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 regulatory C-terminus (RCT) of the thylakoid K+-exchange antiporter KEA3. RCT-mediated control of KEA3 contributes to the balance between light capture and photoprotection. By combiningin silico, in vitro, andin vivoapproaches, we demonstrate that the RCT senses the energy state of the chloroplast in form of both, phosphorylation and redox potential, in a pH-dependent manner and regulates KEA3 activity in response. Together our data pinpoint a regulatory feedback loop by which the stromal energy state orchestrates light capture and photoprotection via KEA3. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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