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Updated: Jul 17, 2025
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Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
Published on: September 17, 2012
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Design principles for cyclin K molecular glue degraders
Zuzanna Kozicka1,2, Dakota J Suchyta1,3, Vivian Focht1
1Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.
Nature Chemical Biology
|September 7, 2023
Summary
Molecular glues degrade cyclin K by linking it to an E3 ligase. This study reveals key binding interactions and shows these degraders offer unique therapeutic potential distinct from kinase inhibitors.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Molecular glue degraders represent a promising therapeutic strategy.
- The design principles for molecular glues remain poorly understood.
- Existing glues deplete cyclin K by linking CDK12-cyclin K to the DDB1-CUL4-RBX1 E3 ligase.
Purpose of the Study:
- To investigate the mechanisms by which diverse small molecules induce cyclin K degradation.
- To establish a conceptual framework for rational molecular glue design.
- To explore the therapeutic potential of cyclin K degraders.
Main Methods:
- Evaluation of 91 candidate degraders using structural, biophysical, and cellular studies.
- Structure-activity relationship analysis.
- Assessment of transcriptional signatures.
Main Results:
- All evaluated molecular glues require simultaneous binding to CDK12 and engagement of DDB1 interfacial residues (specifically Arg928) for activity.
- Previously identified kinase inhibitors function as 'cryptic' degraders.
- The activity of these glues is tuneable and does not necessitate strong inhibitory properties.
- Cyclin K degraders exhibit distinct transcriptional profiles compared to CDK12 inhibitors.
Conclusions:
- Simultaneous binding to CDK12 and DDB1 is crucial for molecular glue activity.
- Molecular glues offer unique therapeutic avenues separate from traditional kinase inhibition.
- This work provides a foundation for the rational design of novel molecular glues.
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