Probing G-quadruplex-ligand binding using DNA intrinsic fluorescence.

Area of Science:

• Biochemistry
• Molecular Biology
• Drug Discovery

Background:

• G-quadruplexes (G4s) are four-stranded DNA structures in guanine-rich regions.
• These structures are found in critical cellular areas like telomeres and promoters.
• Targeting G4s with small molecules is a promising strategy for new anti-cancer, neurological, and antiviral drugs.

Purpose of the Study:

• To introduce a novel optical assay for quantifying small molecule binding to G-quadruplexes.
• To enable the assessment and comparison of G4-binding affinities of various ligands in solution.
• To facilitate the development of G4-targeting therapeutics.

Main Methods:

• An optical assay utilizing the intrinsic fluorescence quenching of DNA G-quadruplexes.
• Direct quantification of ligand binding to specific G4 topologies in solution.
• Comparative analysis of small molecule G4 ligand affinities.

Main Results:

• The assay successfully quantifies ligand binding to distinct G4 structures.
• Demonstrated the ability to assess and compare G4 binding affinities of different small molecules.
• Validated the utility of the fluorescence quenching method for G4 ligand evaluation.

Conclusions:

• The developed optical assay provides a quick and reliable method for evaluating small molecule G4 ligands.
• This assay will support and accelerate the development of novel G4-targeting therapies.
• The intrinsic fluorescence quenching method offers a valuable tool for G4 structural biology and drug discovery.