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DNA binding protein dbpA binds Cdk5 and inhibits its activity
M Moorthamer1, S Zumstein-Mecker, B Chaudhuri
1Oncology Research, Novartis Pharma AG, Basel, Switzerland.
FEBS Letters
|April 1, 1999
Summary
The DNA binding protein dbpA
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Cell cycle progression is regulated by cyclin-dependent kinases (Cdks).
- Cdk5, primarily found in neurons, is activated by p35, also brain-specific.
- Cdk5's role in myogenesis and its regulation in differentiation are unclear.
Purpose of the Study:
- To identify Cdk5-interacting proteins.
- To investigate the regulatory mechanisms of Cdk5 activity during cell differentiation.
Main Methods:
- Yeast two-hybrid system screening of a HeLa cDNA library.
- Biochemical analyses of protein-protein interactions and kinase inhibition.
Main Results:
- A C-terminal domain of DNA binding protein A (dbpA(Cdelta)) binds to Cdk5.
- dbpA(Cdelta) inhibits p35-activated Cdk5 kinase activity.
- dbpA(Cdelta) also interacts with and inhibits Cdk4/cyclin D1, but not Cdk2/cyclin A.
Conclusions:
- The DNA binding protein A (dbpA) interacts with and inhibits Cdk5 and Cdk4.
- This suggests a potential cross-talk between dbpA-mediated signaling and Cdk5/Cdk4 pathways.
- dbpA may play a role in regulating cell differentiation processes involving these kinases.