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Lebecq A, Doumane M, Fangain A, Bayle V, Leong JX, Rozier F, Marques-Bueno MD, Armengot L, Boisseau R, Simon ML, Franz-Wachtel M, Macek B, Üstün S, Jaillais Y, Caillaud MC. The Arabidopsis SAC9 enzyme is enriched in a cortical population of early endosomes and restricts PI(4,5)P 2 at the plasma membrane. eLife 2022; 11:73837. [PMID: 36044021 PMCID: PMC9436410 DOI: 10.7554/elife.73837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 07/09/2022] [Indexed: 01/10/2023] Open
Abstract
Membrane lipids, and especially phosphoinositides, are differentially enriched within the eukaryotic endomembrane system. This generates a landmark code by modulating the properties of each membrane. Phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] specifically accumulates at the plasma membrane in yeast, animal, and plant cells, where it regulates a wide range of cellular processes including endocytic trafficking. However, the functional consequences of mispatterning PI(4,5)P2 in plants are unknown. Here, we functionally characterized the putative phosphoinositide phosphatase SUPPRESSOR OF ACTIN9 (SAC9) in Arabidopsis thaliana (Arabidopsis). We found that SAC9 depletion led to the ectopic localization of PI(4,5)P2 on cortical intracellular compartments, which depends on PI4P and PI(4,5)P2 production at the plasma membrane. SAC9 localizes to a subpopulation of trans-Golgi Network/early endosomes that are enriched in a region close to the cell cortex and that are coated with clathrin. Furthermore, it interacts and colocalizes with Src Homology 3 Domain Protein 2 (SH3P2), a protein involved in endocytic trafficking. In the absence of SAC9, SH3P2 localization is altered and the clathrin-mediated endocytosis rate is reduced. Together, our results highlight the importance of restricting PI(4,5)P2 at the plasma membrane and illustrate that one of the consequences of PI(4,5)P2 misspatterning in plants is to impact the endocytic trafficking.
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Affiliation(s)
- Alexis Lebecq
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | - Mehdi Doumane
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | - Aurelie Fangain
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | - Vincent Bayle
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | - Jia Xuan Leong
- University of Tübingen, Center for Plant Molecular Biology (ZMBP), Tübingen, Germany
| | - Frédérique Rozier
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | | | - Laia Armengot
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | - Romain Boisseau
- Division of Biological Science, University of Montana, Missoula, United States
| | | | - Mirita Franz-Wachtel
- Interfaculty Institute for Cell Biology, Department of Quantitative Proteomics, University of Tübingen, Tübingen, Germany
| | - Boris Macek
- Interfaculty Institute for Cell Biology, Department of Quantitative Proteomics, University of Tübingen, Tübingen, Germany
| | - Suayib Üstün
- University of Tübingen, Center for Plant Molecular Biology (ZMBP), Tübingen, Germany.,Faculty of Biology & Biotechnology, Ruhr-University Bochum, Bochum, Germany
| | - Yvon Jaillais
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
| | - Marie-Cécile Caillaud
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, Lyon, France
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