PROTAC-Mediated Degradation of Bruton’s Tyrosine Kinase Is Inhibited by Covalent Binding
Abstract
The impact of covalent binding on PROTAC-mediated degradation of BTK was investigated through the preparation of both covalent binding and reversible binding PROTACs derived from the covalent BTK inhibitor ibrutinib. It was determined that a covalent binding PROTAC inhibited BTK degradation despite evidence of target engagement, while BTK degradation was observed with a reversible binding PROTAC. These observations were consistently found when PROTACs that were able to recruit either IAP or cereblon E3 ligases were employed. Proteomics analysis determined that the use of a covalently bound PROTAC did not result in the degradation of covalently bound targets, while degradation was observed for some reversibly bound targets. This observation highlights the importance of catalysis for successful PROTAC-mediated degradation and highlights a potential caveat for the use of covalent target binders in PROTAC design.
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BTK has been the subject of intense PROTAC molecule experimentation across academia and industry.
“and has been the subject of intense PROTAC molecule experimentation across academia and industry166–168”
From PROTAC targeted protein degraders: the past is prologue (2022) · cites this paper as [168]
PROTACs binding covalently to the protein target probably lose the substoichiometric nature of their mechanism.
“PROTACs binding covalently to the protein target probably lose the substoichiometric nature of their mechanism 45 .”
From Targeted protein degradation: expanding the toolbox (2019) · cites this paper as [45]
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- Authors
- Tinworth, C. P., Lithgow, H., Dittus, L., Bassi, Z. I., Hughes, S. E., Muelbaier, M., Dai, H., Smith, I. E. D., Kerr, W. J., Burley, G. A., Bantscheff, M., & Harling, J. D.
- Affiliations
- University of Strathclyde (GB)
- GlaxoSmithKline (Germany) (DE)
- GlaxoSmithKline Research & Development Limited (United Kingdom) (GB)
- GlaxoSmithKline (United States) (US)
- Corresponding author
- Tinworth, Christopher P.
- ORCID
- Venue
- ACS Chemical Biology
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-02-26
- Volume
- 14
- Issue
- 3
- Pages
- 342-347
- ISSN
- 1554-8929 (ISSN-L)
- 1554-8937
- OpenAlex
- W2917078121
- Cited by
- 195
- References
- 28
- Citations by year
- 2026: 22 · 2025: 27 · 2024: 26 · 2023: 13 · 2022: 34 · 2021: 28 · 2020: 33 · 2019: 12
- FWCI
- 9.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Chemical Biology (publishedVersion)
- PubMed (publishedVersion)
- Strathprints: The University of Strathclyde institutional repository (University of Strathclyde) (acceptedVersion)
- Funders
- University of Strathclyde
- GlaxoSmithKline
- 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
- Health Sciences › Medicine › Genetics › Chronic Lymphocytic Leukemia Research
- Keywords
- PROTACs, Bruton's tyrosine kinase, ibrutinib, covalent binding, reversible binding, targeted protein degradation, cereblon E3 ligase, target engagement, PROTAC design
- MeSH terms
- Agammaglobulinaemia Tyrosine Kinase, Adenine, Piperidines, Protein Binding, Pyrazoles, Pyrimidines, Ubiquitin-Protein Ligases, Protein Kinase Inhibitors, Inhibitor of Apoptosis Proteins, Proteolysis
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