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Nucleosomes accelerate transcription factor dissociation.

Yi Luo1, Justin A North, Sean D Rose

  • 1Biophysics Graduate Program, The Ohio State University, Columbus, OH 43210, USA, Department of Physics, The Ohio State University, Columbus, OH 43210, USA and Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.

Nucleic Acids Research
|December 20, 2013
PubMed
Summary
This summary is machine-generated.

Nucleosomes dramatically increase transcription factor (TF) dissociation rates from DNA, explaining rapid TF exchange in vivo. This reveals how chromatin structure regulates gene expression dynamics.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • Transcription factors (TFs) regulate gene expression by binding to specific DNA sequences.
  • In vitro, TFs bind DNA with long residence times, but in vivo, they exchange rapidly (seconds).
  • The factors controlling this rapid in vivo TF dissociation remain largely unknown.

Purpose of the Study:

  • To investigate the binding and dissociation dynamics of TFs at their DNA recognition sites.
  • To determine how nucleosomes and chromatin structure affect TF dynamics.
  • To elucidate the mechanisms behind rapid in vivo TF exchange.

Main Methods:

  • Utilized single molecule total internal reflection fluorescence (smTIRF) microscopy.
  • Studied TF dynamics on duplex DNA, single nucleosomes, and short nucleosome arrays.
  • Quantified TF binding and dissociation rates under different DNA contexts.

Main Results:

  • TF dissociation rates increased by 1000-fold within nucleosomes and nucleosome arrays compared to duplex DNA.
  • Nucleosomes significantly accelerate TF dissociation from their DNA-binding sites.
  • This effect explains the rapid exchange of TFs observed in vivo.

Conclusions:

  • Chromatin structure, specifically nucleosomes, plays a critical role in regulating TF dynamics.
  • Nucleosomes not only impede TF binding but drastically enhance TF dissociation rates.
  • These findings provide a mechanism for rapid TF turnover in vivo, impacting gene regulation.