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PARP co-activates B-MYB through enhanced phosphorylation at cyclin/cdk2 sites
G Santilli1, M N Cervellera, T K Johnson
1Department of Oncology and Neurosciences, Section of Medical Oncology, Universita' G. D'Annunzio, 66100 Chieti, Italy.
Oncogene
|January 10, 2002
Summary
Poly(ADP-ribose) polymerase (PARP) enhances the oncogenic transcription factor B-MYB
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Poly(ADP-ribose) polymerase (PARP) is a key protein involved in genome stability and transcription.
- B-MYB is an oncogenic transcription factor crucial for cell proliferation, survival, and differentiation.
- B-MYB activity is regulated by phosphorylation during the S phase of the cell cycle.
Purpose of the Study:
- To investigate the role of PARP in regulating B-MYB activity.
- To elucidate the mechanism by which PARP influences B-MYB phosphorylation and co-activation.
Main Methods:
- Utilized mammalian cell culture systems.
- Employed site-directed mutagenesis to alter B-MYB phosphorylation sites.
- Assessed PARP-induced phosphorylation and co-activation of B-MYB.
Main Results:
- PARP binds to and enhances the transactivating potential of B-MYB.
- PARP induces phosphorylation of B-MYB at sites targeted by cyclin-dependent kinase 2 (cdk2).
- Mutating B-MYB's cdk2 phosphorylation sites renders it unresponsive to PARP-induced phosphorylation and co-activation.
Conclusions:
- PARP acts as a co-factor for B-MYB by promoting its phosphorylation by cyclin/cdk2.
- PARP integrates cyclin-dependent kinase signaling with gene transcription regulation.
- This interaction reveals a novel mechanism controlling gene transcription and cellular processes.