Methods for thermal denaturation studies of nucleic acids in complex with fluorogenic dyes.

Area of Science:

• Biophysics
• Molecular Biology
• Spectroscopy

Background:

• Thermal denaturation is crucial for studying nucleic acid biophysics.
• Standard methods use absorbance at 260nm, but noncanonical structures and ligand binding necessitate alternative wavelengths.
• Identifying the optimal wavelength for monitoring denaturation is often challenging.

Purpose of the Study:

• To develop a versatile system for obtaining absorbance-temperature profiles across the UV-visible spectrum.
• To enable precise analysis of nucleic acid secondary structure stability and RNA-ligand interactions.
• To offer a flexible alternative to fixed-wavelength spectrophotometry.

Main Methods:

• Development of an apparatus and software to acquire full UV-visible spectra during thermal denaturation.
• Extraction of absorbance-temperature profiles at user-defined wavelengths.
• Adaptation of a qPCR instrument for measuring secondary structure stability in fluorescent nucleic acid-ligand complexes.

Main Results:

• The developed system allows for comprehensive spectral analysis of thermal denaturation.
• It facilitates the selection of optimal wavelengths for diverse nucleic acid structures and ligand-binding studies.
• A qPCR-based method is presented for fluorescent complex stability assessment.

Conclusions:

• The new system enhances the study of nucleic acid thermal denaturation by providing spectral flexibility.
• It supports accurate characterization of nucleic acid secondary structures and their interactions with ligands.
• This approach broadens the applicability of biophysical techniques in molecular biology research.