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ATPase-regulated autophagosome biogenesis
Viola Nähse1,2,3, Kay O Schink1,4, Harald Stenmark1,2
1Centre for Cancer Cell Reprogramming, Faculty of Medicine, University of Oslo, montebello, Oslo Norway.
Autophagy
|September 18, 2023
Summary
ZFYVE1 protein
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- Omegasomes, endoplasmic reticulum structures, are implicated in autophagosome biogenesis.
- The precise function of ZFYVE1/DFCP1 in omegasomes and autophagy remains unclear.
- ZFYVE1 depletion does not impede bulk autophagy, posing a paradox.
Purpose of the Study:
- To investigate the role of ZFYVE1's ATPase domain in omegasome function and autophagy.
- To elucidate the mechanism by which ZFYVE1 regulates omegasome constriction and autophagosome completion.
Main Methods:
- Site-directed mutagenesis of ZFYVE1's ATPase domain.
- Analysis of omegasome morphology, expansion, and maturation.
- Assessment of bulk and selective autophagy in ZFYVE1 knockout/mutant cells.
Main Results:
- ZFYVE1 dimerization is regulated by ATP binding and hydrolysis.
- Mutations affecting ATP binding/hydrolysis inhibit omegasome constriction but not expansion.
- Selective autophagy pathways (mitophagy, aggregate clearance) are impaired in ZFYVE1 mutants, unlike bulk autophagy.
Conclusions:
- ZFYVE1's ATPase activity is crucial for omegasome constriction and autophagosome completion.
- ATP-dependent ZFYVE1 conformational changes likely provide energy for omegasome dynamics.
- ZFYVE1 regulates selective autophagy, highlighting its specific role beyond bulk autophagy.
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