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Quantitative analysis of protein-RNA interactions by gel mobility shift
Sean P Ryder1, Michael I Recht, James R Williamson
1Department of Biochemistry and Molecular Pharmacology, UMass Medical School, Worcester, Massachusetts, USA.
Methods in Molecular Biology (Clifton, N.J.)
|November 5, 2008
Summary
The gel mobility shift assay quantifies protein-RNA interactions. This review details using this method to determine thermodynamic properties of protein-RNA complexes through various experimental designs.
Area of Science:
- Molecular Biology
- Biochemistry
- Biophysics
Background:
- Protein-RNA interactions are crucial for cellular functions.
- Gel mobility shift assays (GMSA) are standard for visualizing these interactions.
- Quantitative analysis of GMSA can reveal complex thermodynamic properties.
Purpose of the Study:
- To review the quantitative applications of gel mobility shift assays.
- To demonstrate how GMSA can elucidate thermodynamic properties of protein-RNA complexes.
- To present experimental designs for quantitative analysis.
Main Methods:
- Gel mobility shift assay (GMSA) for visualizing protein-RNA complexes.
- Quantitative analysis of band shifts to determine binding affinities.
- Experimental designs including titration, competition, and stoichiometry assays.
Main Results:
- GMSA can resolve free RNA from protein-bound RNA with high fidelity.
- Quantitative GMSA enables the determination of thermodynamic parameters.
- Specific assay designs are provided for characterizing protein-RNA complexes.
Conclusions:
- Gel mobility shift assays offer a powerful quantitative approach for studying protein-RNA interactions.
- This method is valuable for elucidating the thermodynamics of complex formation.
- The presented assay designs facilitate detailed characterization of these molecular interactions.
