4.7 Article

Atg38 is required for autophagy-specific phosphatidylinositol 3-kinase complex integrity

Journal

JOURNAL OF CELL BIOLOGY
Volume 203, Issue 2, Pages 299-313

Publisher

ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201304123

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Funding

  1. Ministry of Education, Culture, Sports, Science and Technology of Japan
  2. Grants-in-Aid for Scientific Research [23570190, 24659017, 25460063] Funding Source: KAKEN

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Autophagy is a conserved eukaryotic process of protein and organelle self-degradation within the vacuole/lysosome. Autophagy is characterized by the formation of an autophagosome, for which Vps34-dervied phosphatidylinositol 3-phosphate (PI3P) is essential. In yeast, Vps34 forms two distinct protein complexes: complex I, which functions in autophagy, and complex II, which is involved in protein sorting to the vacuole. Here we identify and characterize Atg38 as a stably associated subunit of complex I. In atg38. cells, autophagic activity was significantly reduced and PI3-kinase complex I dissociated into the Vps15-Vps34 and Atg14-Vps30 subcomplexes. We find that Atg38 physically interacted with Atg14 and Vps34 via its N terminus. Further biochemical analyses revealed that Atg38 homodimerizes through its C terminus and that this homodimer formation is indispensable for the integrity of complex I. These data suggest that the homodimer of Atg38 functions as a physical linkage between the Vps15-Vps34 and Atg14-Vps30 subcomplexes to facilitate complex I formation.

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