Dissecting functional roles of p53 N-terminal transactivation domains by microarray expression analysis.

Full Abstract

The p53 protein exerts its tumor suppressive function mainly by acting as a transcription activator. Two transactivation domains (TADs) located at the amino-terminus of p53 are required for transcription activation, and the activity of TADs is tightly regulated by post-translational modifications, such as phosphorylation. We attempted to dissect the functions of the two TADs and phosphorylation within the TADs by analyzing p53 target genes induced by full-length p53 (FL-p53), N-terminally deleted p53 isoform lacking the first TAD (Delta1stTAD) and p53 carrying point mutations at all serine residues within the two TADs (TAD-S/A). By performing a comprehensive survey by employing microarray expression analysis, the induction of target genes by FL-p53, Delta1stTAD and TAD-S/A was analyzed. All p53s showed different target gene induction patterns, suggesting the importance of the two TADs and phosphorylation within the TADs in target gene induction. Although Delta1stTAD showed a marked decrease in the ability to induce genes induced by FL-p53, Delta1stTAD induced many apoptosis-related genes that were not induced by FL-p53, suggesting the roles of these Delta1stTAD-induced genes in Delta1stTAD-dependent apoptosis. Approximately 80% of genes induced by FL-p53 were not induced by TAD-S/A, including 29 previously reported p53 target genes such as Hdm2 and Bax, emphasizing the importance of phosphorylation within the TADs. These results demonstrate the significance of the regulation and differential roles of the N-terminal TADs in p53 transcriptional activity.

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Author information

Author/s: Ohki, Rieko (R); Kawase, Tatsuya (T); Ohta, Tsutomu (T); Ichikawa, Hitoshi (H); Taya, Yoichi (Y);

Affiliation: Radiobiology Division, National Cancer Center Research Institute, Tsujiji 5-1-1, Chuo-ku, Tokyo 104-0045, Japan.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Cancer science (Cancer Sci), published in England. (Language: eng)

Reference: 2007-Feb; vol 98 (issue 2) : pp 189-200

Dates: Created 2007/01/19; Completed 2007/02/23; Revised 2008/11/21;

PMID: 17233836, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

Comments and Corrections

ErratumIn: Cancer Sci. 2007 Mar;98(3):464.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Oligonucleotide Array Sequence Analysis
Phosphorylation
Temperature
Transcriptional Activation - genetics
Tumor Suppressor Protein p53 - chemistry; genetics; metabolism
Up-Regulation

Associated Chemicals: Tumor Suppressor Protein p53 (0)

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