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CDK9 (PITALRE): a multifunctional cdc2-related kinase.
1Department of Pathology, Anatomy, and Cell Biology, Sbarro Institute for Cancer Research and Molecular Medicine, Jefferson Medical College, Philadelphia, Pennsylvania 19107, USA.
Journal of Cellular Physiology
|March 26, 1999
Summary
Cyclin-dependent kinase 9 (CDK9) is a serine-threonine kinase regulating processes beyond cell division, like differentiation. It associates with HIV-Tat and is involved in transcription via the P-TEFb complex.
Area of Science:
- Molecular Biology
- Biochemistry
- Cell Biology
Background:
- Cyclin-dependent kinase 9 (CDK9), also known as PITALRE, is a serine-threonine kinase.
- Unlike other cdc2-like kinases, CDK9 activity is not regulated by the cell cycle.
- CDK9 plays roles in physiological processes such as differentiation.
Purpose of the Study:
- To investigate the functions and interactions of CDK9.
- To understand CDK9's role in cellular processes beyond cell-cycle regulation.
- To explore CDK9's involvement in transcription and potential association with viral proteins.
Main Methods:
- Immunoprecipitation assays to identify CDK9 interacting partners.
- Biochemical assays to study kinase activity.
- Analysis of CDK9 association with HIV-Tat protein.
- Investigation of CDK9's role in the TAK and P-TEFb complexes.
Main Results:
- CDK9 interacts with T-family cyclins.
- CDK9 immunoprecipitates with unidentified regulatory polypeptides.
- CDK9 associates with the HIV-Tat protein.
- CDK9 is responsible for kinase activity in the TAK and P-TEFb complexes, indicating a role in transcription.
Conclusions:
- CDK9 is a key regulator in processes like differentiation and transcription.
- CDK9's interaction with HIV-Tat suggests a role in AIDS pathogenesis.
- CDK9's involvement in the P-TEFb complex highlights its significance in transcriptional regulation.