Cited by 577Protein Degradation and InhibitorsHistone Deacetylase Inhibitors ResearchUbiquitin and proteasome pathways

Pharmacological perturbation of CDK9 using selective CDK9 inhibition or degradation

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Olson, Calla M, Jiang, Baishan, Erb, Michael A, Liang, Yanke, Doctor, Zainab M, Zhang, Zinan, Zhang, Tinghu, Kwiatkowski, Nicholas +9 more·2018·Nature Chemical Biology

Abstract

Cyclin-dependent kinase 9 (CDK9), an important regulator of transcriptional elongation, is a promising target for cancer therapy, particularly for cancers driven by transcriptional dysregulation. We characterized NVP-2, a selective ATP-competitive CDK9 inhibitor, and THAL-SNS-032, a selective CDK9 degrader consisting of a CDK-binding SNS-032 ligand linked to a thalidomide derivative that binds the E3 ubiquitin ligase Cereblon (CRBN). To our surprise, THAL-SNS-032 induced rapid degradation of CDK9 without affecting the levels of other SNS-032 targets. Moreover, the transcriptional changes elicited by THAL-SNS-032 were more like those caused by NVP-2 than those induced by SNS-032. Notably, compound washout did not significantly reduce levels of THAL-SNS-032-induced apoptosis, suggesting that CDK9 degradation had prolonged cytotoxic effects compared with CDK9 inhibition. Thus, our findings suggest that thalidomide conjugation represents a promising strategy for converting multi-targeted inhibitors into selective degraders and reveal that kinase degradation can induce distinct pharmacological effects compared with inhibition.

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  • 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”
  • Degradation target profiles often differ vastly from parental inhibitor selectivity profiles because of a non-linear dependence on binding.

    “Similarly, because of a non-linear dependence on binding, degradation target profiles often differ vastly from parental inhibitor selectivity profiles (Olson et al., 2018)”
  • 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).”
  • CRBNN351D led to a marked sensitization (15-fold shift in EC50) to THAL-SNS-032.

    “Simultaneously, it led to a marked sensitization (15-fold shift in EC50) to the CDK9-targeting PROTAC THAL-SNS-03240 (Extended Data Fig. 6B and C).”
  • Selective degradation of CDK9 was achieved by converting the non-selective CDK inhibitor SNS-032 into a degrader.

    “For example, selective degradation of CDK9 was achieved by converting the non-selective CDK inhibitor SNS-032 into a degrader[9].”

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Research works printed but not linked: 1

  1. [41]Edwards A Haas W Proteomics in Systems Biology: Methods and Protocols Reinders J 1 13 Springer New York New York, NY 2016

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Authors
Olson, C. M., Jiang, B., Erb, M. A., Liang, Y., Doctor, Z. M., Zhang, Z., Zhang, T., Kwiatkowski, N., Boukhali, M., Green, J. L., Haas, W., Nomanbhoy, T., Fischer, E. S., Young, R. A., Bradner, J. E., Winter, G. E., & Gray, N. S.
Affiliations
  • Harvard University (US)
  • California Sea Grant (US)
  • Whitehead Institute for Biomedical Research (US)
Corresponding author
Gray, Nathanael S
Venue
Nature Chemical Biology
Published
2017-12-18
Volume
14
Issue
2
Pages
163-170
ISSN
  • 1552-4450 (ISSN-L)
  • 1552-4469
OpenAlex
W2781383440
Cited by
552
References
49
Citations by year
2026: 41 · 2025: 78 · 2024: 71 · 2023: 63 · 2022: 69 · 2021: 77 · 2020: 77 · 2019: 51 · 2018: 24 · 2017: 1
FWCI
17.42
Type
journal article
Language
en
Open access
Locations
  • Nature Chemical Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion)
  • PMC
Funders
  • National Cancer Institute (R01CA179483, R01CA218278)
  • National Institute of General Medical Sciences (T32GM007753)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Histone Deacetylase Inhibitors Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
CDK9, transcription elongation, CDK9 inhibitor, SNS-032, cereblon, E3 ubiquitin ligase, apoptosis, transcriptional dysregulation, cancer therapy
MeSH terms
Humans, Ligands, Oxazoles, Peptide Hydrolases, Phosphorylation, Protein Binding, Protein Conformation, Thalidomide, Thiazoles, Apoptosis, Crystallography, X-Ray, Inhibitory Concentration 50, Proteomics, Cyclin-Dependent Kinase 9, Ubiquitin-Protein Ligases, Cell Line, Tumor, Protein Kinase Inhibitors, Adaptor Proteins, Signal Transducing, Cell Proliferation

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