Characterization of tectoRNA assembly with cationic conjugated polymers.

Area of Science:

• Biochemistry and Molecular Biology
• Polymer Chemistry
• Analytical Chemistry

Background:

• Quantifying molecular recognition between RNA structures is crucial for understanding biological processes.
• Existing methods for RNA association studies can be complex or lack sensitivity.
• Cationic conjugated polymers (CCPs) offer unique optical and electrostatic properties for molecular sensing.

Purpose of the Study:

• To develop a sensitive method for quantifying RNA-RNA associations using CCPs.
• To leverage fluorescence resonance energy transfer (FRET) for signal amplification in RNA detection.
• To determine solution dissociation constants for RNA-heterodimer formation.

Main Methods:

• Utilized a fluorophore-labeled probe RNA (RNA-F*) and a target RNA (RNA-T).
• Employed cationic conjugated polymers (CCPs) to bind to the negatively charged RNA structures.
• Monitored changes in F* intensity, indicative of FRET, upon RNA-heterodimer formation.

Main Results:

• Heterodimer formation between RNA-T and RNA-F* enhanced CCP binding due to increased negative charge.
• This enhanced binding led to reduced CCP-F* distance and increased FRET efficiency.
• The method allowed for the determination of solution dissociation constants by analyzing fluorescence intensity changes.

Conclusions:

• Cationic conjugated polymers provide a sensitive platform for quantifying RNA-RNA associations.
• The optical amplification of emissive polymers enhances the detection of molecular recognition events.
• This approach offers a valuable tool for studying RNA-based molecular interactions and binding affinities.