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The C-terminus of p63 contains multiple regulatory elements with different functions
W E Straub1, T A Weber, B Schäfer
1Institute of Biophysical Chemistry, Goethe University, Frankfurt am Main, Germany.
Cell Death & Disease
|March 3, 2011
Summary
The transcription factor p63 has two key isoforms regulating development and oocyte stability. Its C-terminal inhibitory domain uses binding and sumoylation to control p63 activity and concentration.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- The transcription factor p63 exists in multiple isoforms with vital roles in ectodermal development and oocyte genetic stability.
- Two critical p63 isoforms possess a C-terminal inhibitory domain that negatively regulates their transcriptional activity.
Purpose of the Study:
- To identify critical regions within the p63 C-terminal inhibitory domain using alanine scanning.
- To elucidate the mechanisms by which the C-terminal domain inhibits p63 transcriptional activity and regulates its intracellular concentration.
Main Methods:
- Extensive alanine scanning mutagenesis of the p63 C-terminal inhibitory domain.
- Assays to measure transcriptional activity of p63 mutants.
- Analysis of intracellular p63 levels for sumoylation-deficient mutants.
Main Results:
- A stretch of approximately 13 amino acids within the inhibitory domain was identified as crucial for its binding function.
- Sumoylation-deficient p63 mutants showed reduced intracellular concentration, suggesting sumoylation controls p63 levels.
- These findings indicate that the C-terminal domain inhibits p63 through both direct transcriptional masking and indirect regulation of protein concentration.
Conclusions:
- The C-terminal inhibitory domain of p63 functions through a dual mechanism involving direct masking of the transactivation domain and indirect regulation of protein stability via sumoylation.
- Understanding these regulatory mechanisms is critical for comprehending p63's roles in ectodermal development and oocyte genetic stability.
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