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Related Experiment Videos

Sequence-specific DNA-binding dominated by dehydration

T Lundbäck1, T Härd

  • 1Center for Structural Biochemistry, Karolinska Institutet, Huddinge, Sweden.Thomas. Lundback@csb.ki.se

Proceedings of the National Academy of Sciences of the United States of America
|May 14, 1996
PubMed
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Glucocorticoid receptor DNA binding thermodynamics were studied using calorimetry. Dehydration and solvent reorganization significantly influence binding, impacting enthalpy and entropy changes.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Biochemistry

Background:

  • The glucocorticoid receptor (GR) plays a crucial role in gene regulation.
  • Understanding the thermodynamics of GR DNA-binding domain (DBD) interactions with DNA is vital for deciphering gene expression mechanisms.

Purpose of the Study:

  • To investigate the thermodynamic principles governing the binding of the GR DBD to various DNA sequences.
  • To elucidate the contributions of dehydration and solvent effects to the binding thermodynamics.

Main Methods:

  • Fluorescence spectroscopy was employed to monitor binding interactions.
  • Isothermal titration calorimetry (ITC) was utilized to determine the thermodynamic parameters (enthalpy, entropy, heat capacity) of binding.

Main Results:

Related Experiment Videos

  • Calorimetric heat capacity changes (ΔCp°obs) align with predictions based on solvent-accessible surface area dehydration.
  • A strong linear correlation between enthalpy change (ΔHo(obs)) and entropy change (ΔSo(obs)) suggests a dominant role for solvent reorganization.
  • Structural comparisons revealed that removing a methyl group at the DNA-protein interface is enthalpically favorable but entropically unfavorable, likely due to ordered water molecule replacement.

Conclusions:

  • Dehydration and solvent reorganization are key drivers of the thermodynamics in GR DBD-DNA interactions.
  • The study provides a detailed thermodynamic and structural rationale for differential binding affinities to similar DNA sites.
  • Findings contribute to understanding sequence-specific DNA recognition by transcription factors.