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Nucleo-cytoplasmic environment modulates spatiotemporal p53 phase separation.

Debalina Datta1, Ambuja Navalkar1, Arunima Sakunthala1,2

  • 1Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai 400076, India.

Science Advances
|December 11, 2024
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Summary
This summary is machine-generated.

Transcription factors like p53 form liquid-like condensates essential for gene regulation. Mutations can impair p53 function by altering condensate properties, impacting DNA binding and cellular activity.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Liquid-liquid phase separation (LLPS) is crucial for gene regulation via transcription factor condensates.
  • The tumor suppressor p53's function is linked to its phase separation behavior.

Purpose of the Study:

  • To investigate the spatiotemporal formation and material properties of p53 condensates.
  • To understand how these properties influence p53's transcriptional function and DNA binding.
  • To explore the impact of cancer-associated mutations on p53 condensate behavior.

Main Methods:

  • Utilized cellular models and in vitro biophysical studies.
  • Analyzed p53 condensate formation, material properties, and DNA binding in different cellular compartments.
  • Investigated the role of nuclear components like RNA and DNA in modulating p53 phase separation.

Main Results:

  • Wild-type p53 forms liquid-like nuclear condensates with DNA binding and transcriptional activity.
  • Cancer-associated mutations lead to misfolded, rigidified p53 condensates with reduced DNA binding.
  • Cytoplasmic p53 forms condensates that rapidly solidify.
  • RNA and non-specific DNA promote liquid-like p53 condensates, while specific DNA promotes p53 tetramer dissolution.

Conclusions:

  • p53 phase separation dynamics are critical for its function in gene regulation.
  • Altered condensate properties due to mutations impair tumor suppressor activity.
  • The cellular environment and DNA interactions finely tune p53 condensate behavior and function.