Bridged Proteolysis Targeting Chimera (PROTAC) Enables Degradation of Undruggable Targets
Open accessAbstract
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.”
From Recent advances in targeting the “undruggable” proteins: from drug discovery to clinical trials (2023) · cites this paper as [522]
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Discovery of the First-in-Class G9a/GLP PROTAC Degrader
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Coming of Age: Targeting Cyclin K in Cancers
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Lysosome and related protein degradation technologies
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Discovery and Characterization of a Novel Cereblon-Recruiting PRC1 Bridged PROTAC Degrader
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Targeting autophagy drug discovery: Targets, indications and development trends
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Advances in the mechanism of CDK4/6 inhibitor resistance in HR+/HER2− breast cancer
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Bifunctional robots inducing targeted protein degradation
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Discovery of small molecule degraders for modulating cell cycle
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Natural Compound‐Rhein and PROTACs Unleash Potent VEGFR‐2 Degraders
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Targeting the cell-cycle machinery for cancer therapy
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FDA-approved kinase inhibitors in PROTAC design, development and synthesis
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A Multi-Split-and-Mix Platform for a Variety of Targeted Protein Degradation
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Mechanisms that matter: unbiased cellular screening for degraders
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Harnessing Multiplexed Proteolysis-Targeting Chimera for Comprehensive Influenza A Virus Targeting
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Opportunities and challenges of PROTAC in the treatment of protein-driven diseases
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Engineering Polymeric Nano-PROTAC for Targeted Protein Degradation and Cancer Therapy
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Diversified design strategies for small-molecule PROTACs: How do we select?
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Bridged PROTAC, DNA-based PROTAC and hydrophobic tag technologies for targeted protein degradation
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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
- ORCID
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-11-30
- Volume
- 144
- Issue
- 49
- Pages
- 22622-22632
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- PMC
- PMC9772293
- 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
- green
- www.ncbi.nlm.nih.gov
- Licence
- 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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