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Updated: May 17, 2026

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Human Cdc14A regulates Wee1 stability by counteracting CDK-mediated phosphorylation
Sara Ovejero1, Patricia Ayala, Avelino Bueno
1Instituto de Biología Molecular y Celular del Cáncer and Departamento de Microbiología y Genética, Universidad de Salamanca/Consejo Superior de Investigaciones Científicas, 37007 Salamanca, Spain.
Cdc14A dephosphorylates Wee1, preventing its degradation and counteracting Cdk1-cyclin B1 activity. This regulation is crucial for maintaining proper mitotic timing and cell cycle progression.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Mitotic progression relies on precise regulation of Cdk1-cyclin B1 activity.
- Wee1/Myt1 kinases and Cdc25 phosphatases balance Cdk1 activity.
- Cdk1 phosphorylates Wee1, priming it for degradation via Plk1.
Purpose of the Study:
- Investigate the role of Cdc14A in regulating Wee1 stability.
- Elucidate the mechanism by which Cdc14A affects Wee1 phosphorylation and degradation.
Main Methods:
- Depletion of Cdc14A in cellular models.
- Analysis of Wee1 protein levels and phosphorylation status.
- Identification of binding domains and specific phosphorylation sites.
Main Results:
- Cdc14A depletion significantly reduces Wee1 protein levels.
- Cdc14A binds to Wee1's amino-terminal domain.
- Cdc14A dephosphorylates Wee1 at Ser-123 and Ser-139, inhibiting Plk1 interaction and Wee1 degradation.
Conclusions:
- Cdc14A stabilizes Wee1 by reversing Cdk1-mediated phosphorylation.
- Cdc14A acts as a negative regulator of Cdk1-cyclin B1 activity.
- This pathway is essential for controlling mitotic entry and timing.
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