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Interaction and functional collaboration of p300 and C/EBPbeta
S Mink1, B Haenig, K H Klempnauer
1Hans Spemann Laboratory, Max Planck Institute for Immunobiology, Freiburg, Germany.
Molecular and Cellular Biology
|October 29, 1997
Summary
The study identifies p300 as a coactivator for C/EBPbeta, demonstrating its role in gene transcription. P300 enhances C/EBPbeta and Myb cooperation, revealing a novel mechanism for transactivator synergy in gene regulation.
Area of Science:
- Molecular Biology
- Gene Regulation
- Protein Interactions
Background:
- Transcriptional coactivators like p300 and CBP are crucial for gene expression.
- C/EBPbeta is a key transcription factor in the myelomonocytic lineage.
Purpose of the Study:
- To investigate the role of p300 in C/EBPbeta-mediated transactivation.
- To elucidate the interaction between p300 and C/EBPbeta.
- To understand p300's function in cooperative transcription activation.
Main Methods:
- Adenovirus E1A inhibition assays.
- Ectopic expression of p300.
- Co-immunoprecipitation to study protein interactions.
- Analysis of transcription factor synergy.
Main Results:
- Adenovirus E1A inhibits C/EBPbeta activity, but p300 can reverse this inhibition.
- C/EBPbeta and p300 directly interact, with specific binding domains identified.
- p300 acts as a coactivator for both C/EBPbeta and Myb.
- p300 enhances synergistic transcriptional activity between C/EBPbeta and Myb.
Conclusions:
- p300 is a bona fide coactivator for C/EBPbeta.
- p300 mediates cooperation between transcription factors binding to distinct p300 domains.
- p300 plays a novel role in coordinating multiple transactivators for gene regulation.