Cited by 1,242Protein Degradation and InhibitorsUbiquitin and proteasome pathwaysChemical Synthesis and Analysis

Structural basis of PROTAC cooperative recognition for selective protein degradation

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Gadd, Morgan S, Testa, Andrea, Lucas, Xavier, Chan, Kwok-Ho, Chen, Wenzhang, Lamont, Douglas J, Zengerle, Michael, Ciulli, Alessio·2017·Nature Chemical Biology

Abstract

Inducing macromolecular interactions with small molecules to activate cellular signaling is a challenging goal. PROTACs (proteolysis-targeting chimeras) are bifunctional molecules that recruit a target protein in proximity to an E3 ubiquitin ligase to trigger protein degradation. Structural elucidation of the key ternary ligase-PROTAC-target species and its impact on target degradation selectivity remain elusive. We solved the crystal structure of Brd4 degrader MZ1 in complex with human VHL and the Brd4 bromodomain (Brd4 BD2). The ligand folds into itself to allow formation of specific intermolecular interactions in the ternary complex. Isothermal titration calorimetry studies, supported by surface mutagenesis and proximity assays, are consistent with pronounced cooperative formation of ternary complexes with Brd4 BD2. Structure-based-designed compound AT1 exhibits highly selective depletion of Brd4 in cells. Our results elucidate how PROTAC-induced de novo contacts dictate preferential recruitment of a target protein into a stable and cooperative complex with an E3 ligase for selective degradation.

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Crossref · 10.1038/nchembio.2329

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  • The cooperativity of a bifunctional proximity inducer system is attributable to the ligand-induced protein-protein interface.

    “By contrast, the cooperativity of a bifunctional proximity inducer system is attributable to the ligand-induced protein–protein interface37.”
  • In previous studies of bifunctional proximity inducers, a cooperativity term α has been used to characterize the effects of protein-protein interaction in ternary complex formation.

    “In previous studies of bifunctional proximity inducers, a cooperativity term (represented by α) has been used to characterize the effects of protein–protein interaction in ternary complex formation36,37.”
  • When plotted on a logarithmic scale, the MG dose-response curve has a sigmoid shape, in contrast to the bell-shaped dose-response curve produced by bifunctional proximity inducers.

    “When plotted on a logarithmic scale, the MG dose-response curve has a familiar sigmoid shape (Fig. 7c), which is in stark contrast to the bell-shaped dose-response curve produced by the bifunctional proximity inducers36,37.”
  • Several mechanisms contribute to increased selectivity of PROTACs, including steric incapability of some targets to form a productive ternary complex, or lack of a suitably positioned lysine residue for ubiquitination.

    “Several mechanisms have been shown to contribute to this increase in selectivity. This includes steric incapability of some targets to form a productive ternary complex, or lack of a suitably positioned lysine residue for ubiquitination.62−69”
  • It is widely believed that degraders uncouple efficacy from target occupancy.

    “It is widely believed that degraders uncouple efficacy from target occupancy (Gadd et al., 2017; Nowak et al., 2018; Olson et al., 2018; Roy et al., 2019).”

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Authors
Gadd, M. S., Testa, A., Lucas, X., Chan, K.-H., Chen, W., Lamont, D. J., Zengerle, M., & Ciulli, A.
Affiliations
University of Dundee (GB)
Corresponding author
Ciulli, Alessio
Venue
Nature Chemical Biology
Published
2017-03-13
Volume
13
Issue
5
Pages
514-521
ISSN
  • 1552-4450 (ISSN-L)
  • 1552-4469
OpenAlex
W2597078857
Cited by
1,242
References
60
Citations by year
2026: 173 · 2025: 173 · 2024: 176 · 2023: 159 · 2022: 138 · 2021: 129 · 2020: 133 · 2019: 86 · 2018: 46 · 2017: 26 · 2014: 1
FWCI
33.34
Type
journal article
Language
en
Open access
Locations
  • Nature Chemical Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Lancaster EPrints (Lancaster University) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Discovery Research Portal (University of Dundee) (submittedVersion, other-oa)
Funders
  • Wellcome Trust (100476, 094090/Z/10/Z, 094090, 100476/Z/12/Z)
  • Diamond Light Source (MX10071)
  • European Commission (H2020-MSCA-IF-2014, H2020- MSCA-IF-2015, H2020, 655516, H2020‐MSCA‐IF, H2020-MSCA)
  • Directorate for Biological Sciences
  • Horizon 2020 Framework Programme (H2020‐MSCAIF‐2014, H2020-MSCA, MSCA-IF-2014, H2020-MSCA-IF-2015)
  • Medical Research Council
  • Biotechnology and Biological Sciences Research Council (BB/J001201/1, BB/J001201/2)
  • H2020 Marie Skłodowska-Curie Actions (H2020-MSCA-IF-2014, H2020-MSCA-IF-2014-655516, H2020, 655516, H2020-MSCA-IF, H2020-MSCA-IF-2015, H2020-MSCA, 806323, H2020-MSCA-IF-2015-806323)
  • FP7 Ideas: European Research Council (311460)
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
PROTACs, BRD4, VHL E3 ubiquitin ligase, bromodomain, selective protein degradation, crystal structure, ternary complex, structure-based drug design, ubiquitination
MeSH terms
Elongin, Bromodomain Containing Proteins, Amino Acid Sequence, Dipeptides, Heterocyclic Compounds, 3-Ring, Humans, Models, Molecular, Nuclear Proteins, Protein Binding, Protein Conformation, Structure-Activity Relationship, Thermodynamics, Transcription Factors, Crystallography, X-Ray, Cell Cycle Proteins, Ubiquitin-Protein Ligases, Multiprotein Complexes, Von Hippel-Lindau Tumor Suppressor Protein, Small Molecule Libraries, Proteolysis

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