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Updated: Mar 31, 2026

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
CK1δ activity is modulated by CDK2/E- and CDK5/p35-mediated phosphorylation
Chiara Ianes1, Pengfei Xu, Natalie Werz
1Department of General and Visceral Surgery, Surgery Centre, Ulm University Hospital, Albert‑Einstein‑Allee 23, 89081 Ulm, Germany.
Casein kinase 1 delta (CK1δ) activity is modulated by interactions with Cyclin-dependent kinases (CDKs). This discovery offers new avenues for developing therapeutic strategies targeting neurological diseases and cancer.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Casein kinase 1 (CK1) protein kinases are highly conserved and ubiquitously expressed, regulating vital cellular processes.
- Dysregulation of CK1 activity is implicated in neurological diseases and cancer, making it a key drug development target.
- Understanding CK1 regulation mechanisms is crucial for advancing therapeutic strategies.
Purpose of the Study:
- To identify cellular kinases that modulate the activity of Casein kinase 1 delta (CK1δ).
- To investigate the functional consequences of interactions between CK1δ and other kinase complexes.
- To explore the therapeutic potential of modulating CK1δ activity in cancer.
Main Methods:
- Site-specific phosphorylation analysis of CK1δ's C-terminal domain.
- In vitro kinase assays to assess CK1δ activity.
- Cell-based assays using pancreatic cancer cells treated with Dinaciclib.
Main Results:
- Cyclin-dependent kinase 2/Cyclin E (CDK2/E) and Cyclin-dependent kinase 5/p35 (CDK5/p35) were identified as modulators of CK1δ activity.
- Pre-incubation with CDK2/E or CDK5/p35 reduced in vitro CK1δ activity.
- Inhibition of CDKs by Dinaciclib increased CK1δ activity in pancreatic cancer cells.
Conclusions:
- CK1δ activity is regulated by its interplay with CDK2/E and CDK5/p35 complexes.
- These findings provide novel insights into CK1δ regulation.
- The study highlights potential CK1δ-targeting therapeutic strategies for cancer and neurological disorders.
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