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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Dissecting functional roles of p53 N-terminal transactivation domains by microarray expression analysis
Rieko Ohki1, Tatsuya Kawase, Tsutomu Ohta
1Radiobiology Division, National Cancer Center Research Institute, Tsujiji 5-1-1, Chuo-ku, Tokyo 104-0045, Japan.
Cancer Science
|January 20, 2007
Summary
The tumor suppressor p53 protein
Area of Science:
- Molecular Biology
- Cancer Research
- Genetics
Background:
- The p53 protein is a crucial tumor suppressor.
- Its function relies on transcriptional activation.
- Post-translational modifications, like phosphorylation, regulate p53 activity.
Purpose of the Study:
- To investigate the distinct roles of p53's two transactivation domains (TADs).
- To understand the impact of phosphorylation within these TADs on target gene induction.
- To analyze how different p53 forms affect gene expression patterns.
Main Methods:
- Microarray expression analysis was used.
- Compared gene induction by full-length p53 (FL-p53), p53 lacking the first TAD (Delta1stTAD), and p53 with mutated TAD serine residues (TAD-S/A).
Main Results:
- FL-p53, Delta1stTAD, and TAD-S/A exhibited unique target gene induction profiles.
- Delta1stTAD induced apoptosis-related genes not activated by FL-p53.
- TAD-S/A failed to induce approximately 80% of FL-p53 target genes, including Hdm2 and Bax.
Conclusions:
- The two TADs and their phosphorylation are critical for p53's transcriptional regulation.
- Differential roles of N-terminal TADs significantly influence p53's activity.
- Phosphorylation within TADs is essential for the induction of many p53 target genes.
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