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Updated: Jun 9, 2025

Monitoring Stub1-Mediated Pexophagy
Published on: May 12, 2023
AAA+ ATPase chaperone p97/VCPFAF2 governs basal pexophagy
Fumika Koyano1, Koji Yamano2, Tomoyuki Hoshina2
1Department of Biomolecular Pathogenesis, Medical Research Institute, Tokyo Medical and Dental University (TMDU) (Medical Research Laboratory, Institute of Integrated Research, Institute of Science Tokyo), 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8510, Japan. koyano-fm.biom@tmd.ac.jp.
Mammalian FAF2/UBXD8 maintains peroxisomal homeostasis by controlling peroxisomal membrane protein turnover. Its absence triggers pexophagy, the autophagic clearance of peroxisomes, highlighting a role in regulating organelle stability.
Area of Science:
- Cell Biology
- Molecular Biology
- Organelle Biology
Background:
- Peroxisomes are vital organelles involved in lipid metabolism and detoxification.
- Mechanisms governing peroxisomal membrane protein (PMP) maintenance are not fully understood.
- FAF2/UBXD8 is a p97/VCP cofactor associated with cellular membranes.
Purpose of the Study:
- To investigate the role of FAF2/UBXD8 in maintaining peroxisomal homeostasis.
- To elucidate the mechanisms regulating peroxisomal membrane protein turnover.
- To understand the connection between FAF2/UBXD8, p97/VCP, and peroxisomal dynamics.
Main Methods:
- Cellular studies using FAF2-deficient cells.
- Analysis of peroxisomal membrane protein PMP70 levels and localization.
- Investigation of autophagy adaptor OPTN recruitment to peroxisomes.
- Assessment of pexophagy induction upon FAF2 deficiency or p97/VCP inhibition.
Main Results:
- FAF2 deficiency leads to PMP70 accumulation and subsequent pexophagy.
- PMP70 accumulation recruits the autophagy adaptor OPTN to peroxisomes.
- Inhibition of p97/VCP also induces pexophagy.
- FAF2 acts with p97/VCP to negatively regulate pexophagy, not involved in biogenesis.
Conclusions:
- FAF2/UBXD8 and p97/VCP collaborate to extract ubiquitylated PMPs, preventing unnecessary pexophagy.
- This mechanism maintains peroxisomal integrity under steady-state conditions.
- The p97/VCPFAF2 complex plays a crucial role in regulating peroxisomal homeostasis and preventing excessive autophagy.
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