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Related Experiment Videos

p63 consensus DNA-binding site: identification, analysis and application into a p63MH algorithm.

C A Perez1, J Ott, D J Mays

  • 1Department of Biochemistry, Center in Molecular Toxicology, The Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA.

Oncogene
|June 15, 2007
PubMed
Summary
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The p63 transcription factor binds DNA differently than p53, with a more flexible binding site. This difference helps p63 regulate specific genes, impacting cellular processes.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • p53 and p63 are transcription factors crucial for cellular functions.
  • Differences in their DNA-binding sites (DBS) may explain their distinct roles.
  • Understanding these differences is key to deciphering gene regulation.

Purpose of the Study:

  • To identify the specific DNA-binding preferences of p63 using SELEX.
  • To compare p63's DNA-binding consensus with that of p53.
  • To investigate how DBS variations influence transcriptional regulation by p63 and p53.

Main Methods:

  • Systematic Evolution of Ligands by Exponential Enrichment (SELEX) to identify p63 ligands.
  • Bioinformatic analysis to determine the consensus DNA-binding site for p63.

Related Experiment Videos

  • Comparative analysis of p63 and p53 DNA-binding sequences.
  • Development of the p63MH algorithm for motif identification.
  • Functional assays to assess transcriptional activation from response elements (REs).

    • Main Results:

    • p63 preferentially binds to a degenerate 20 bp DNA sequence: 5'-RRRC(A/G)(A/T)GYYYRRRC(A/T)(C/T)GYYY-3'.
    • The p63 DBS is more degenerate than the p53 consensus, with specific nucleotide enrichments.
    • Differences in DBS influenced p63 and p53's transcriptional activity on selected REs.
    • The p63MH algorithm successfully identified p63-regulated genes with functional p63 REs.

    Conclusions:

    • The sequence composition of DNA-binding sites is a significant factor in target gene discrimination between p63 and p53.
    • p63 exhibits distinct DNA-binding preferences compared to p53, contributing to its unique regulatory functions.
    • The identified p63 consensus sequence and the p63MH algorithm provide valuable tools for studying p63-mediated gene regulation.