Cited by 993Autophagy in Disease and TherapyUbiquitin and proteasome pathwaysParkinson's Disease Mechanisms and Treatments

Broad activation of the ubiquitin–proteasome system by Parkin is critical for mitophagy

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Chan, Nickie C., Salazar, Anna M., Pham, Anh H., Sweredoski, Michael J., Kolawa, Natalie J., Graham, Robert L.J., Hess, Sonja, Chan, David C.·2011·Human Molecular Genetics

Abstract

Parkin, an E3 ubiquitin ligase implicated in Parkinson's disease, promotes degradation of dysfunctional mitochondria by autophagy. Using proteomic and cellular approaches, we show that upon translocation to mitochondria, Parkin activates the ubiquitin-proteasome system (UPS) for widespread degradation of outer membrane proteins. This is evidenced by an increase in K48-linked polyubiquitin on mitochondria, recruitment of the 26S proteasome and rapid degradation of multiple outer membrane proteins. The degradation of proteins by the UPS occurs independently of the autophagy pathway, and inhibition of the 26S proteasome completely abrogates Parkin-mediated mitophagy in HeLa, SH-SY5Y and mouse cells. Although the mitofusins Mfn1 and Mfn2 are rapid degradation targets of Parkin, we find that degradation of additional targets is essential for mitophagy. These results indicate that remodeling of the mitochondrial outer membrane proteome is important for mitophagy, and reveal a causal link between the UPS and autophagy, the major pathways for degradation of intracellular substrates.

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  • The positive effect of mitochondrial uncoupling on autophagy has been established in many cellular and animal models, including adipocytes, MEFs, HeLa cells, HepG2 cells, SH-SY5Y neuroblastoma cells, and C57BL6 mice.

    “The positive effect of mitochondrial uncoupling on autophagy has been established in many cellular and animal models, including adipocytes [91], MEFs [92], HeLa cells [93], HepG2 cells [90], SH-SY5Y neuroblastoma cells [93], or C57BL6 mice [94].”

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Authors
Chan, N. C., Salazar, A. M., Pham, A. H., Sweredoski, M. J., Kolawa, N. J., Graham, R. L. J., Hess, S., & Chan, D. C.
Affiliations
  • California Institute of Technology (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Chan, David C.
Venue
Human Molecular Genetics
Published
2011-02-04
Volume
20
Issue
9
Pages
1726-1737
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2130979925
Cited by
993
References
42
Citations by year
2026: 28 · 2025: 36 · 2024: 56 · 2023: 43 · 2022: 53 · 2021: 80 · 2020: 79 · 2019: 62 · 2018: 67 · 2017: 51 · 2016: 75 · 2015: 72 · 2014: 97 · 2013: 81 · 2012: 75
FWCI
68.89
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Human Molecular Genetics (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion, cc-by-nc)
  • Research Portal (Queen's University Belfast) (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institute of General Medical Sciences (R01GM062967, GM062967)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
Keywords
Parkin, ubiquitin-proteasome system, mitophagy, Parkinson's disease, mitochondrial outer membrane proteins, 26S proteasome, K48-linked polyubiquitin, mitofusins, Mfn1, mitofusin 2, mitochondrial protein degradation, autophagy
MeSH terms
Animals, Autophagy, Cell Line, Humans, Mitochondria, Parkinson Disease, Mitochondrial Proteins, Ubiquitin, Ubiquitin-Protein Ligases, Proteasome Endopeptidase Complex, Mice

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