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Exploring the ATG9A interactome uncovers interaction with VPS13A.

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Autophagy protein ATG9A interacts with lipid synthesis and trafficking proteins, including VPS13A. This discovery reveals new roles for ATG9A beyond its known function in autophagosome expansion.

Keywords:
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • ATG9A is a core autophagy protein involved in autophagosome expansion, potentially acting as a lipid scramblase.
  • Its function is thought to involve interaction with ATG2A, a lipid transfer protein.
  • ATG9A also plays roles in membrane repair and lipid droplet homeostasis.

Purpose of the Study:

  • To identify novel ATG9A interactors within and beyond the autophagy pathway.
  • To elucidate the functional significance of these interactions.

Main Methods:

  • Interactome analysis using mass spectrometry.
  • Co-immunoprecipitation assays to confirm direct interactions.

Main Results:

  • Mass spectrometry identified proteins involved in lipid synthesis and trafficking, including ACSL3, VPS13A, and VPS13C.
  • Direct interaction between ATG9A and VPS13A was confirmed.
  • A distinct ATG9A-VPS13A complex was observed, separate from the ATG9A-ATG2A complex.

Conclusions:

  • ATG9A interacts with key proteins in lipid metabolism, suggesting broader roles in cellular lipid homeostasis.
  • The formation of a distinct ATG9A-VPS13A complex points to novel regulatory mechanisms in cellular processes.
  • Further research is warranted to explore the functional implications of these newly identified interactions.