Cited by 154Protein Degradation and InhibitorsUbiquitin and proteasome pathwaysChemical Synthesis and Analysis

Bridged Proteolysis Targeting Chimera (PROTAC) Enables Degradation of Undruggable Targets

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Xiong, Yan, Zhong, Yue, Yim, Hyerin, Yang, Xiaobao, Park, Kwang-Su, Xie, Ling, Poulikakos, Poulikos I., Han, Xiaoran +4 more·2022·Journal of the American Chemical Society

Abstract

Proteolysis Targeting Chimeras (PROTACs) are attractive therapeutic modalities for degrading disease-causing proteins. While many PROTACs have been developed for numerous protein targets, current small-molecule PROTAC approaches cannot target undruggable proteins that do not have small-molecule binders. Here, we present a novel PROTAC approach, termed bridged PROTAC, which utilizes a small-molecule binder of the target protein's binding partner to recruit the protein complex into close proximity with an E3 ubiquitin ligase to target undruggable proteins. Applying this bridged PROTAC strategy, we discovered MS28, the first-in-class degrader of cyclin D1, which lacks a small-molecule binder. MS28 effectively degrades cyclin D1, with faster degradation kinetics and superior degradation efficiency than CDK4/6, through recruiting the CDK4/6-cyclin D1 complex to the von Hippel-Lindau E3 ligase. MS28 also suppressed the proliferation of cancer cells more effectively than CDK4/6 inhibitors and degraders. Altogether, the bridged PROTAC strategy could provide a generalizable platform for targeting undruggable proteins.

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  • MS28 (221) is a PROTAC that selectively degrades Cyclin D1, consisting of a VHL ligand linked to CDK4/6 ligand palbociclib, and its degradation of Cyclin D1 relies on CDK6, VHL, and the ubiquitinase system.

    “In a recent study, Jin’s team proposed an innovative strategy for developing bridging PROTACs and successfully synthesized MS28 (221), a PROTAC that selectively degrades Cyclin D1 (Table 4). MS28 consists of a VHL ligand linked to the CDK4/6 ligand palbociclib, and its degradation of Cyclin D1 relies on CDK6, VHL, and the ubiquitinase system.”

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Authors
Xiong, Y., Zhong, Y., Yim, H., Yang, X., Park, K.-S., Xie, L., Poulikakos, P. I., Han, X., Xiong, Y., Chen, X., Liu, J., & Jin, J.
Affiliations
  • Tisch Cancer Institute (US)
  • University of North Carolina at Chapel Hill (US)
  • Cullgen Inc., San Diego, California 92130, United States
Corresponding author
Jin, Jian
Venue
Journal of the American Chemical Society
Published
2022-11-30
Volume
144
Issue
49
Pages
22622-22632
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W4310380205
Cited by
154
References
50
Citations by year
2026: 49 · 2025: 50 · 2024: 33 · 2023: 22
FWCI
8.57
Type
journal article
Language
en
Open access
Locations
  • Journal of the American Chemical Society (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (R01CA218600, R01CA230854, R01CA260666, R01CA268384, R01CA268519)
  • National Institute of General Medical Sciences (T32GM062754)
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, protein degradation, undruggable targets, E3 ubiquitin ligase, VHL, cyclin D1, CDK4/6, small-molecule binders, tumor cell proliferation
MeSH terms
Proteolysis Targeting Chimera, Proteins, Cyclin D1, Ubiquitin-Protein Ligases, Proteolysis

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