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The CDK inhibitor CR8 acts as a molecular glue degrader that depletes cyclin K.

Nature | 2020

Molecular glue compounds induce protein-protein interactions that, in the context of a ubiquitin ligase, lead to protein degradation1. Unlike traditional enzyme inhibitors, these molecular glue degraders act substoichiometrically to catalyse the rapid depletion of previously inaccessible targets2. They are clinically effective and highly sought-after, but have thus far only been discovered serendipitously. Here, through systematically mining databases for correlations between the cytotoxicity of 4,518 clinical and preclinical small molecules and the expression levels of E3 ligase components across hundreds of human cancer cell lines3-5, we identify CR8-a cyclin-dependent kinase (CDK) inhibitor6-as a compound that acts as a molecular glue degrader. The CDK-bound form of CR8 has a solvent-exposed pyridyl moiety that induces the formation of a complex between CDK12-cyclin K and the CUL4 adaptor protein DDB1, bypassing the requirement for a substrate receptor and presenting cyclin K for ubiquitination and degradation. Our studies demonstrate that chemical alteration of surface-exposed moieties can confer gain-of-function glue properties to an inhibitor, and we propose this as a broader strategy through which target-binding molecules could be converted into molecular glues.

Pubmed ID: 32494016 RIS Download

Associated grants

  • Agency: NCI NIH HHS, United States
    Id: R35 CA253125
  • Agency: NCI NIH HHS, United States
    Id: P50 CA206963
  • Agency: NHLBI NIH HHS, United States
    Id: R01 HL082945
  • Agency: NIGMS NIH HHS, United States
    Id: T32 GM007753
  • Agency: NCI NIH HHS, United States
    Id: R01 CA214608
  • Agency: NCI NIH HHS, United States
    Id: R01 CA218278
  • Agency: Howard Hughes Medical Institute, United States
  • Agency: NCI NIH HHS, United States
    Id: P01 CA066996
  • Agency: NCI NIH HHS, United States
    Id: K08 CA230220

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Non-profit plasmid repository dedicated to helping scientists around the world share high-quality plasmids. Facilitates archiving and distributing DNA-based research reagents and associated data to scientists worldwide. Repository contains over 65,000 plasmids, including special collections on CRISPR, fluorescent proteins, and ready-to-use viral preparations. There is no cost for scientists to deposit plasmids, which saves time and money associated with shipping plasmids themselves. All plasmids are fully sequenced for validation and sequencing data is openly available. We handle the appropriate Material Transfer Agreements (MTA) with institutions, facilitating open exchange and offering intellectual property and liability protection for depositing scientists. Furthermore, we curate free educational resources for the scientific community including a blog, eBooks, video protocols, and detailed molecular biology resources.

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RRID:SCR_005375

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