Cited by 122Protein Degradation and InhibitorsUbiquitin and proteasome pathwaysChemical Synthesis and Analysis

Plasticity of the Cullin-RING Ligase Repertoire Shapes Sensitivity to Ligand-Induced Protein Degradation

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Mayor-Ruiz, Cristina, Jaeger, Martin G., Bauer, Sophie, Brand, Matthias, Sin, Celine, Hanzl, Alexander, Mueller, André C., Menche, Jörg +1 more·2019·Molecular Cell

Abstract

Inducing protein degradation via small molecules is a transformative therapeutic paradigm. Although structural requirements of target degradation are emerging, mechanisms determining the cellular response to small-molecule degraders remain poorly understood. To systematically delineate effectors required for targeted protein degradation, we applied genome-scale CRISPR/Cas9 screens for five drugs that hijack different substrate receptors (SRs) of cullin RING ligases (CRLs) to induce target proteolysis. We found that sensitivity to small-molecule degraders is dictated by shared and drug-specific modulator networks, including the COP9 signalosome and the SR exchange factor CAND1. Genetic or pharmacologic perturbation of these effectors impairs CRL plasticity and arrests a wide array of ligases in a constitutively active state. Resulting defects in CRL decommissioning prompt widespread CRL auto-degradation that confers resistance to multiple degraders. Collectively, our study informs on regulation and architecture of CRLs amenable for targeted protein degradation and outlines biomarkers and putative resistance mechanisms for upcoming clinical investigation.

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Crossref · 10.1016/j.molcel.2019.07.013

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  • Target identification and elucidation of the mechanism of action of degraders via functional genomics was initially mostly driven by pooled CRISPR/Cas9 screens with a positive selection readout based on cellular fitness.

    “Target identification and elucidation of the mechanism of action of degraders via functional genomics was initially mostly driven by pooled CRISPR/Cas9 screens with a positive selection readout based on cellular fitness (“drug resistance screens”).168,232,233”
  • CRBN loss is inconsequential for KBM7 proliferation.

    “Previous studies have shown that CRBN loss is inconsequential for KBM7 proliferation15.”
  • Most emerging mutations occur directly in the SR of the involved E3 ligase.

    “In line with previous studies that employed CRISPR/Cas9 screens13–15, we show that most emerging mutations occur directly in the SR of the involved E3 ligase.”
  • Impaired UBE2M function confers degrader resistance through inactivation of a substantial number of CRL complexes.

    “UBE2M is an essential E2 enzyme in the neddylation cascade whose impaired function confers degrader resistance through the inactivation of a substantial number of CRL complexes.141”

    From Chasing molecular glue degraders: screening approaches (2022) · cites this paper as [141]

  • Several functional genomics campaigns have helped map how the repertoire of CRLs and their regulators shape degrader efficacy, outlining putative resistance mechanisms.

    “Several functional genomics campaigns in recent years have helped map how the repertoire of CLRs and their regulators shape degrader efficacy, thus also outlining putative resistance mechanisms.141-151”

    From Chasing molecular glue degraders: screening approaches (2022) · cites this paper as [141]

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Authors
Mayor-Ruiz, C., Jaeger, M. G., Bauer, S., Brand, M., Sin, C., Hanzl, A., Mueller, A. C., Menche, J., & Winter, G. E.
Affiliations
Austrian Academy of Sciences (AT)
Corresponding author
Winter, Georg E.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2019-08
Volume
75
Issue
4
Pages
849-858.e8
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2969906935
Cited by
119
References
80
Citations by year
2026: 16 · 2025: 15 · 2024: 15 · 2023: 20 · 2022: 22 · 2021: 15 · 2020: 15 · 2019: 1
FWCI
4.47
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Boehringer Ingelheim Fonds
  • Österreichischen Akademie der Wissenschaften (EMBO-LTF ALTF 676-2017)
  • Apex Foundation
  • Medizinische Universität Wien
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
Keywords
cullin-RING ligases, targeted protein degradation, small-molecule degraders, substrate receptor, COP9 signalosome, CAND1, drug resistance, CRISPR-Cas9 screen, proteolysis
MeSH terms
COP9 Signalosome Complex, Humans, Transcription Factors, Cullin Proteins, Proteolysis

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