Monitoring Equilibrium Changes in RNA Structure by ‘Peroxidative’ and ‘Oxidative’ Hydroxyl Radical Footprinting

Overview

This protocol describes how to quantify the Mg(II)-dependent formation of RNA tertiary structure using hydroxyl radical footprinting. The method involves end labeling, gel purification, and pre-folding of RNA to ensure its conformational integrity.

Key Study Components

Area of Science

• Biochemistry
• Molecular Biology
• RNA Structure Analysis

Background

• Understanding RNA folding is crucial for elucidating its functional roles.
• Hydroxyl radical footprinting provides insights into RNA tertiary structures.
• Mg(II) ions play a significant role in RNA folding dynamics.
• Quantifying RNA structure formation can aid in the study of various biological processes.

Purpose of Study

• To ascertain how RNA molecules fold using hydroxyl radical footprinting.
• To generate folding isotherms reflecting the tertiary structure formation of RNA.
• To analyze the solvent accessibility of RNA during the folding process.

Methods Used

• End labeling of RNA molecules.
• Gel purification to isolate RNA.
• Pre-folding of RNA to maintain conformational integrity.
• Use of Fenton reagents to generate hydroxyl radicals for RNA cleavage.

Main Results

• Separation of RNA cleavage products via denaturing polyacrylamide gel electrophoresis.
• Visualization of RNA bands through autoradiography.
• Quantification of band integrals using semi-automated footprinting analysis software.
• Generation of folding isotherms that reflect RNA tertiary structure formation.

Conclusions

• The protocol effectively quantifies RNA tertiary structure formation.
• Hydroxyl radical footprinting is a valuable method for studying RNA folding.
• Results can enhance understanding of RNA's functional roles in biological systems.

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