Cited by 252Protein Degradation and InhibitorsChemical Synthesis and AnalysisUbiquitin and proteasome pathways

Trivalent PROTACs enhance protein degradation via combined avidity and cooperativity

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Imaide, Satomi, Riching, Kristin M., Makukhin, Nikolai, Vetma, Vesna, Whitworth, Claire, Hughes, Scott J., Trainor, Nicole, Mahan, Sarah D. +9 more·2021·Nature Chemical Biology

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Abstract

Bivalent proteolysis-targeting chimeras (PROTACs) drive protein degradation by simultaneously binding a target protein and an E3 ligase and forming a productive ternary complex. We hypothesized that increasing binding valency within a PROTAC could enhance degradation. Here, we designed trivalent PROTACs consisting of a bivalent bromo and extra terminal (BET) inhibitor and an E3 ligand tethered via a branched linker. We identified von Hippel-Lindau (VHL)-based SIM1 as a low picomolar BET degrader with preference for bromodomain containing 2 (BRD2). Compared to bivalent PROTACs, SIM1 showed more sustained and higher degradation efficacy, which led to more potent anticancer activity. Mechanistically, SIM1 simultaneously engages with high avidity both BET bromodomains in a cis intramolecular fashion and forms a 1:1:1 ternary complex with VHL, exhibiting positive cooperativity and high cellular stability with prolonged residence time. Collectively, our data along with favorable in vivo pharmacokinetics demonstrate that augmenting the binding valency of proximity-induced modalities can be an enabling strategy for advancing functional outcomes.

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  • The degradation efficacy of PROTACs is influenced by valence number, and the trivalent PROTAC SIM1 exhibits significantly enhanced degradation compared to its divalent counterpart.

    “Researchers discovered that the degradation efficacy of PROTACs is influenced by valence number. The trivalent PROTAC named SIM1, developed by Satomi Imaide’s team, exhibited significantly enhanced degradation compared to its divalent counterpart.521”

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Authors
Imaide, S., Riching, K. M., Makukhin, N., Vetma, V., Whitworth, C., Hughes, S. J., Trainor, N., Mahan, S. D., Murphy, N., Cowan, A. D., Chan, K.-H., Craigon, C., Testa, A., Maniaci, C., Urh, M., Daniels, D. L., & Ciulli, A.
Affiliations
  • University of Dundee (GB)
  • Promega (United States) (US)
Corresponding author
  • Daniels, Danette L.
  • Ciulli, Alessio
Venue
Nature Chemical Biology
Published
2021-10-21
Volume
17
Issue
11
Pages
1157-1167
ISSN
  • 1552-4450 (ISSN-L)
  • 1552-4469
OpenAlex
W3205001044
Cited by
251
References
62
Citations by year
2026: 38 · 2025: 59 · 2024: 57 · 2023: 45 · 2022: 44 · 2021: 8
FWCI
12.33
Type
journal article
Language
en
Open access
Locations
  • Nature Chemical Biology (publishedVersion)
  • Research Square (acceptedVersion, cc-by)
  • ChemRxiv (acceptedVersion, cc-by)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Discovery Research Portal (University of Dundee) (submittedVersion, other-oa)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
  • Wellcome Trust (094090/Z/10/Z, strategic awards to Dundee 100476/Z/12/Z and 094090/Z/10/Z, 100476/Z/12/Z)
  • Ono Pharmaceutical
  • European Research Council (Starting Grant ERC-2012-StG-311460 DrugE3CRLs)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
protein degradation, BET inhibitors, SIM1, BRD2, avidity, positive cooperativity, ternary complex, anticancer activity, pharmacokinetics
MeSH terms
Humans, Ubiquitin-Protein Ligases, Proteolysis

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