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The NF-kappa B p65 promoter
1Dana-Farber Cancer Institute, Department of Pathology, Harvard Medical School, Boston, MA 02115.
Journal of Acquired Immune Deficiency Syndromes
|March 1, 1993
Summary
The human p65 promoter, lacking TATA/CCAAT sequences but containing SP1 sites, was analyzed. It does not bind NF-kappa B and is not activated by PMA/PHA, revealing key promoter elements.
Area of Science:
- Molecular biology
- Gene regulation
Background:
- The transcription factor NF-kappa B plays a crucial role in immune responses and cellular processes.
- Understanding the regulatory mechanisms of NF-kappa B subunits, like p65, is essential for comprehending gene expression control.
Purpose of the Study:
- To clone and determine the nucleotide sequence of the human p65 promoter.
- To identify regulatory elements within the p65 promoter and assess its transcriptional activity.
Main Methods:
- Cloning and sequencing of the human p65 gene promoter.
- Bioinformatic analysis for consensus sequences (TATA, CCAAT, SP1, NF-kappa B binding sites).
- Transient transfection assays with deletion mutants in Jurkat cells, treated with phorbol ester (PMA) and phytohemagglutinin (PHA).
Main Results:
- The p65 promoter lacks TATA and CCAAT consensus sequences.
- Three SP1 transcription factor binding sites were identified within the p65 promoter.
- No predicted NF-kappa B binding sites were found in the p65 promoter, unlike the p50 subunit promoter.
- PMA and PHA treatments did not activate the p65 promoter in Jurkat cells.
- Deletion analysis mapped essential promoter elements.
Conclusions:
- The human p65 promoter possesses unique regulatory features, including the absence of TATA/CCAAT boxes and NF-kappa B binding sites, but presence of SP1 binding sites.
- The p65 promoter is not directly activated by PMA or PHA in Jurkat cells, suggesting alternative regulatory pathways.
- Essential elements for p65 promoter function were identified through deletion mapping.