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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Unlocking p53 response elements: DNA shape is the key

Marina Farkas1, Steven McMahon1

  • 1Department of Biochemistry and Molecular Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA.

Molecular & Cellular Oncology
|May 24, 2021
PubMed

Insights

The tumor suppressor protein p53 (53 kDa) shows dose-dependent selectivity for genome regulatory sequences. DNA shape dictates p53 binding modes, influencing cell death or survival outcomes.

Area of Science:

  • Molecular Biology
  • Genomics
  • Cell Biology

Background:

  • The tumor suppressor protein p53 (53 kDa) recognizes specific regulatory sequences (REs) in the genome.
  • p53 exhibits dose-dependent selectivity, with higher concentrations generally required for binding REs linked to cell death than cell survival genes.

Purpose of the Study:

  • To provide a mechanistic explanation for the dose-dependent selectivity of p53 binding to genomic regulatory sequences.
  • To elucidate how DNA sequence variations influence p53's biological outcomes.

Main Methods:

  • Analysis of DNA sequence and shape.
  • Biochemical characterization of DNA-binding modes.

Main Results:

  • Subtle differences in DNA shape, encoded within RE DNA sequences, were identified as key determinants of p53 binding.
  • These sequence-encoded DNA shape variations lead to the utilization of two distinct biochemical DNA-binding modes by p53.

Conclusions:

  • The distinct DNA-binding modes utilized by p53, dictated by DNA shape, provide a mechanistic basis for its differential regulation of cell death and survival pathways.
  • Understanding these mechanisms can offer insights into cancer biology and therapeutic strategies targeting p53.
Keywords:
DNA bindingcell fategenome recognitionp53

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