A fluorescent intercalator displacement assay for establishing DNA binding selectivity and affinity

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Understanding DNA binding properties is crucial for drug development and molecular biology.
• Existing methods for DNA binding analysis can be complex and time-consuming.

Purpose of the Study:

• To present a novel protocol for a fluorescent intercalator displacement (FID) assay.
• To demonstrate the utility of the FID assay for characterizing DNA-ligand interactions.

Main Methods:

• The study details a protocol based on fluorescent intercalator displacement.
• This method involves monitoring changes in fluorescence upon binding of a test molecule to DNA.

Main Results:

• The FID assay effectively establishes DNA binding selectivity, affinity, and stoichiometry.
• The assay can also determine binding site size and distinguish between different modes of DNA binding.

Conclusions:

• The presented FID assay protocol offers a robust and versatile method for DNA binding analysis.
• This assay is valuable for researchers investigating DNA-protein or DNA-small molecule interactions.