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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Identifying G-Quadruplex-DNA-Disrupting Small Molecules.

Jérémie Mitteaux1, Pauline Lejault1, Filip Wojciechowski2

  • 1Institut de Chimie Moléculaire, ICMUB CNRS UMR 6302, UBFC, 21078 Dijon, France.

Journal of the American Chemical Society
|August 4, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed new in vitro assays to find molecules that destabilize G-quadruplex DNA (G4). This work identifies a phenylpyrrolocytosine (PhpC) analog as a promising G4-disrupting agent for potential neurobiology applications.

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Molecular Biology

Background:

  • G-quadruplex DNA (G4) research has focused on ligands that bind and stabilize G4 structures.
  • Molecules that destabilize G4s are needed for applications in neurobiology, particularly for diseases linked to G4 overrepresentation.

Purpose of the Study:

  • To develop reliable in vitro assays for identifying small molecules that destabilize G4 structures.
  • To characterize a novel G4-destabilizing molecule.

Main Methods:

  • Developed a new G4-unfold assay, adapted from a G4-helicase assay.
  • Utilized biophysical (CD, UV-vis) and biochemical (PAGE, FRET-melting) techniques.
  • Adapted a qPCR stop assay for G4 destabilization analysis.

Main Results:

  • Established a multipronged workflow for G4 destabilization assay development.
  • Identified a phenylpyrrolocytosine (PhpC)-based G-clamp analog as a G4-disrupting molecule.
  • Validated the properties of the PhpC analog through complementary in vitro evaluations.

Conclusions:

  • The developed assays provide a reliable method for identifying G4 destabilizers.
  • The PhpC-based G-clamp analog serves as a prototype for G4-disrupting small molecules.
  • This research opens avenues for developing chemical biology tools to target G4s in disease contexts.