Measuring RNA-Ligand Interactions with Microscale Thermophoresis

Area of Science:

• Molecular Biology
• Biochemistry
• Chemical Biology

Background:

• Recent advancements highlight RNA's diverse roles beyond its intermediate function in molecular biology.
• The discovery of novel RNA functions necessitates the development of RNA-targeting small molecule probes for biological investigation and therapeutic potential.
• Existing methods for measuring RNA-small molecule interactions often present limitations in routine applicability and broad scope.

Purpose of the Study:

• To introduce and validate microscale thermophoresis (MST) as a robust technique for studying RNA interactions.
• To demonstrate the utility of MST in quantifying binding affinities of RNA-involved complexes.
• To showcase MST's application in investigating peptide-RNA interactions and small molecule-mediated displacement assays.

Main Methods:

• Microscale thermophoresis (MST) was employed to measure the directed movement of molecules along a temperature gradient.
• MST was utilized to determine binding affinities for various RNA-related interactions.
• The technique was applied to assess peptide-RNA binding, RNA-small molecule interactions, and competitive displacement assays.

Main Results:

• MST demonstrated high sensitivity in measuring binding affinities, effective in the nanomolar to micromolar range.
• The study successfully applied MST to analyze peptide-RNA interactions.
• MST effectively characterized RNA-small molecule interactions and the displacement of RNA-bound peptides by small molecules.

Conclusions:

• Microscale thermophoresis (MST) is a sensitive and broadly applicable technique for studying RNA interactions.
• MST facilitates the characterization of RNA-small molecule and peptide-RNA binding affinities.
• This method aids in the development of RNA-targeting small molecule probes for biological and therapeutic applications.