Cited by 247Ubiquitin and proteasome pathwaysAutophagy in Disease and TherapyHeat shock proteins research

The AAA-ATPase p97 is essential for outer mitochondrial membrane protein turnover

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Xu, Shan, Peng, Guihong, Wang, Yang, Fang, Shengyun, Karbowski, Mariusz·2011·Molecular Biology of the Cell

Abstract

Recent studies have revealed a role for the ubiquitin/proteasome system in the regulation and turnover of outer mitochondrial membrane (OMM)-associated proteins. Although several molecular components required for this process have been identified, the mechanism of proteasome-dependent degradation of OMM-associated proteins is currently unclear. We show that an AAA-ATPase, p97, is required for the proteasomal degradation of Mcl1 and Mfn1, two unrelated OMM proteins with short half-lives. A number of biochemical assays, as well as imaging of changes in localization of photoactivable GFP-fused Mcl1, revealed that p97 regulates the retrotranslocation of Mcl1 from mitochondria to the cytosol, prior to, or concurrent with, proteasomal degradation. Mcl1 retrotranslocation from the OMM depends on the activity of the ATPase domain of p97. Furthermore, p97-mediated retrotranslocation of Mcl1 can be recapitulated in vitro, confirming a direct mitochondrial role for p97. Our results establish p97 as a novel and essential component of the OMM-associated protein degradation pathway.

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Authors
Xu, S., Peng, G., Wang, Y., Fang, S., & Karbowski, M.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
Karbowski, Mariusz
Venue
Molecular Biology of the Cell
Published
2011-02
Volume
22
Issue
3
Pages
291-300
ISSN
  • 1059-1524 (ISSN-L)
  • 1939-4586
OpenAlex
W2082069715
Cited by
243
References
46
Citations by year
2026: 5 · 2025: 6 · 2024: 12 · 2023: 14 · 2022: 12 · 2021: 16 · 2020: 21 · 2019: 16 · 2018: 17 · 2017: 15 · 2016: 23 · 2015: 15 · 2014: 23 · 2013: 19 · 2012: 16
FWCI
6.26
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • Molecular Biology of the Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
National Institute of General Medical Sciences (R01GM083131)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
Keywords
VCP, AAA+ ATPase, mitochondrial outer membrane, protein turnover, proteasomal degradation, Mcl-1, Mfn1, retrotranslocation, ubiquitin-proteasome system, mitochondrial protein degradation, ATPase domain
MeSH terms
Adenosine Triphosphatases, Cytosol, HeLa Cells, Humans, Nuclear Proteins, Recombinant Fusion Proteins, Protein Structure, Tertiary, Proto-Oncogene Proteins c-bcl-2, GTP Phosphohydrolases, Protein Transport, Mitochondrial Proteins, Membrane Transport Proteins, Mitochondrial Membrane Transport Proteins, Proteasome Endopeptidase Complex, Green Fluorescent Proteins, Mitochondrial Membranes, Protein Stability, Myeloid Cell Leukemia Sequence 1 Protein

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