Cited by 83Ubiquitin and proteasome pathwaysHeat shock proteins researchAutophagy in Disease and Therapy

Compromising the 19S proteasome complex protects cells from reduced flux through the proteasome

Open access
Tsvetkov, Peter, Mendillo, Marc L, Zhao, Jinghui, Carette, Jan E, Merrill, Parker H, Cikes, Domagoj, Varadarajan, Malini, van Diemen, Ferdy R +5 more·2015·eLife

Abstract

Proteasomes are central regulators of protein homeostasis in eukaryotes. Proteasome function is vulnerable to environmental insults, cellular protein imbalance and targeted pharmaceuticals. Yet, mechanisms that cells deploy to counteract inhibition of this central regulator are little understood. To find such mechanisms, we reduced flux through the proteasome to the point of toxicity with specific inhibitors and performed genome-wide screens for mutations that allowed cells to survive. Counter to expectation, reducing expression of individual subunits of the proteasome's 19S regulatory complex increased survival. Strong 19S reduction was cytotoxic but modest reduction protected cells from inhibitors. Protection was accompanied by an increased ratio of 20S to 26S proteasomes, preservation of protein degradation capacity and reduced proteotoxic stress. While compromise of 19S function can have a fitness cost under basal conditions, it provided a powerful survival advantage when proteasome function was impaired. This means of rebalancing proteostasis is conserved from yeast to humans.

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Authors
Tsvetkov, P., Mendillo, M. L., Zhao, J., Carette, J. E., Merrill, P. H., Cikes, D., Varadarajan, M., van Diemen, F. R., Penninger, J. M., Goldberg, A. L., Brummelkamp, T. R., Santagata, S., & Lindquist, S.
Affiliations
  • Whitehead Institute for Biomedical Research (US)
  • Howard Hughes Medical Institute (US)
  • Harvard University (US)
  • Stanford Medicine (US)
  • Brigham and Women's Hospital (US)
  • Institute of Molecular Biotechnology (AT)
  • Department of Biochemistry, Netherlands Cancer Institute, Amsterdam, Netherlands
  • The Netherlands Cancer Institute (NL)
Corresponding author
  • Santagata, Sandro
  • Lindquist, Susan
Venue
eLife
Published
2015-09-01
Volume
4
ISSN
2050-084X (ISSN-L)
OpenAlex
W2119348362
Cited by
83
References
79
Citations by year
2026: 4 · 2025: 6 · 2024: 4 · 2023: 13 · 2022: 12 · 2021: 7 · 2020: 14 · 2019: 4 · 2018: 4 · 2017: 6 · 2016: 5 · 2015: 3
FWCI
2.60
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
Funders
  • EMBO (ALTF 739-2011)
  • National Institutes of Health (K08NS064168)
  • The Medical Foundation (Charles A. King Trust)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
proteasome inhibitors, proteostasis, proteotoxic stress, protein degradation
MeSH terms
Cell Line, Cell Survival, Epithelial Cells, Humans, Hepatocytes, Proteasome Endopeptidase Complex

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