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Published on: December 4, 2018
A dimer-specific function of the transcription factor NFATp.
James V Falvo1, Charles H Lin, Alla V Tsytsykova
1Immune Disease Institute and Harvard Medical School, 800 Huntington Avenue, Boston, MA 02115, USA.
The transcription factor NFATp dimerizes to activate tumor necrosis factor (TNF) gene transcription. DNA binding induces NFATp dimerization, enabling interaction with coactivator CBP for gene regulation.
Area of Science:
- Molecular Biology
- Gene Regulation
- Transcription Factors
Background:
- NFATp (Nuclear Factor of Activated T-cells) integrates signaling pathways via protein interactions.
- NFATp monomers recruit bZIP proteins to DNA, but dimer function remains unclear.
Purpose of the Study:
- Determine the NFATp dimer's consensus DNA binding site.
- Characterize monomer- and dimer-specific DNA binding patterns.
- Investigate the role of NFATp dimerization in TNF gene transcription.
Main Methods:
- Electrophoretic mobility shift assays (EMSAs) to study DNA binding.
- Reporter gene assays to measure transcriptional activity.
- Co-immunoprecipitation to assess protein interactions.
Main Results:
- NFATp dimer binds noncooperatively to the TNF promoter.
- Dimerization-specific subdomains of NFATp are essential for TNF transcription.
- NFATp interacts with the coactivator CBP for TNF gene activation.
Conclusions:
- DNA-directed NFATp dimerization potentiates context-specific activation domain function.
- NFATp dimerization is crucial for TNF gene transcription via CBP interaction.
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