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Xu, Lingna; Wang, Liquan; Tong, Chao
Autophagy, 07/2023, Volume: 19, Issue: 7Journal Article
Miga is an evolutionarily conserved protein that localizes to the outer membrane of mitochondria and mediates endoplasmic reticulum (ER)-mitochondrial contacts through interaction with VAP proteins in the ER. We recently reported that Miga is required for autophagosome-lysosome fusion during macroautophagy/autophagy. Miga binds to Atg14 and Uvrag, two alternative subunits of the class III phosphatidylinositol 3-kinase (PtdIns3K) complex. Miga regulates phosphatidylinositol-3-phosphate (PtdIns3P) levels through its interaction with Uvrag and its ER-mitochondrial contact site (ERMCS) tethering activity. Miga stabilizes Atg14, which maintains steady levels of the SNARE protein, Syx17. We propose that Miga establishes a direct link between mitochondria and autophagy to maintain cellular homeostasis.
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