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The rod-shaped ATG2A-WIPI4 complex tethers membranes in vitro
Takanori Otomo1, Saikat Chowdhury1,2, Gabriel C Lander1
1Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Contact (Thousand Oaks (Ventura County, Calif.))
|February 16, 2019
Summary
The ATG2A-WIPI4 complex links membranes during autophagy, crucial for phagophore expansion. This protein complex tethers the omegasome to other membranes, advancing our understanding of autophagy mechanisms.
Area of Science:
- Cell Biology
- Molecular Biology
- Autophagy Research
Background:
- Autophagy is a vital cellular process for degrading damaged components.
- Phagophore biogenesis, the initial step in autophagy, involves the omegasome, a specific endoplasmic reticulum (ER) subdomain.
- Understanding the molecular mechanisms of phagophore expansion is key to comprehending autophagy.
Purpose of the Study:
- To investigate the role of the ATG2A-WIPI4 complex in phagophore expansion.
- To elucidate the structural and functional properties of ATG2A and WIPI4 in membrane tethering.
Main Methods:
- Structural biology techniques to determine the complex's architecture.
- Biochemical assays to assess membrane-interacting capabilities.
- Localization studies at the omegasome during autophagy.
Main Results:
- The ATG2A-WIPI4 complex acts as a molecular bridge, tethering membranes.
- ATG2A possesses dual membrane-binding domains, facilitating its role in membrane association.
- WIPI4's PI3P-binding ability directs the complex to specific membrane sites.
Conclusions:
- The ATG2A-WIPI4 complex is essential for mediating membrane interactions during phagophore expansion.
- This complex links the omegasome to surrounding membranes like the ER and vesicles, facilitating autophagosome formation.
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