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G-Quadruplex Stability from DSC Measurements.

San Hadži1, Matjaž Bončina1, Jurij Lah2

  • 1Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia.

Methods in Molecular Biology (Clifton, N.J.)
|August 25, 2019
PubMed
Summary
This summary is machine-generated.

Guanine-rich DNA can form G-quadruplex (G4) structures. Differential scanning calorimetry (DSC) and global fitting reveal thermodynamic parameters, offering insights into G4 stability and phase diagrams.

Keywords:
DNADSCFoldingG-quadruplexKineticsPhase diagramStabilityThermodynamics

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Guanine-rich DNA sequences can form non-canonical G-quadruplex (G4) structures.
  • These G4 structures are stabilized by specific cations and play roles in various biological processes.
  • Understanding the thermodynamics of G4 folding is crucial for characterizing their stability and function.

Purpose of the Study:

  • To present a method for obtaining thermodynamic and kinetic parameters of G-quadruplex structures.
  • To demonstrate the utility of differential scanning calorimetry (DSC) coupled with global fitting for G4 analysis.
  • To illustrate how thermodynamic data can be used to construct phase diagrams for G4 systems.

Main Methods:

  • Employing differential scanning calorimetry (DSC) to measure heat flow associated with G4 folding/unfolding.
  • Utilizing global fitting of an appropriate thermodynamic model to DSC data.
  • Analyzing thermodynamic parameters to understand G4 folding and interconversion.

Main Results:

  • Accurate thermodynamic and kinetic parameters for G4 structures were obtained.
  • The driving forces behind G4 folding and interconversion were elucidated.
  • Phase diagrams were generated, providing a comprehensive view of G4 behavior under varying conditions.

Conclusions:

  • Differential scanning calorimetry combined with global fitting is a powerful approach for characterizing G4 thermodynamics.
  • Thermodynamic parameters provide insights into the stability and conformational landscape of G4 structures.
  • Phase diagrams offer an elegant representation of G4 phase space across different solution conditions.