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Electrophoretic Mobility Shift Assay (EMSA) for the Study of RNA-Protein Interactions: The IRE/IRP Example
Published on: December 3, 2014
Assessing protein-RNA interactions using microfluidic capillary mobility shift assays.
Jimmy Fourtounis1, Jean-Pierre Falgueyret, Camil Elie Sayegh
1Department of Antiviral Research, Merck Research Laboratories, Montreal, Quebec, Canada H9H 3L1.
Analytical Biochemistry
|December 7, 2010
Summary
A new microfluidic capillary electrophoresis method accurately quantifies protein-RNA interactions, like HIV-1 Tat binding to TAR RNA. This high-throughput technique shows potential for drug discovery targeting nucleic acid-protein interactions.
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- Protein-RNA interactions are crucial for biological processes.
- Characterizing these interactions is vital for understanding disease mechanisms and developing therapeutics.
- Existing methods can be time-consuming or lack throughput.
Purpose of the Study:
- To develop and validate a novel, high-throughput method for characterizing protein-RNA interactions.
- To utilize a fluorescence-based multiwell capillary electrophoresis platform for this purpose.
- To demonstrate the method's utility by studying the human immunodeficiency virus 1 (HIV-1) transactivator of transcription (Tat) and transactivation-responsive RNA (TAR) interaction.
Main Methods:
- Development of a microfluidic capillary electrophoresis platform.
- Quantification of binding between recombinant HIV-1 Tat and TAR RNA using fluorescence detection.
- Validation of the assay by assessing the role of the UCU bulge in TAR RNA.
- Dose-dependent inhibition studies using neomycin.
Main Results:
- Established conditions for quantifying HIV-1 Tat-TAR RNA binding.
- Demonstrated the critical role of the UCU bulge in TAR RNA for Tat binding.
- Showed neomycin inhibits Tat-TAR binding with an IC(50) of 1.6-3.0 μM.
- Confirmed the method's compatibility with high-throughput screening.
Conclusions:
- The developed microfluidic capillary electrophoresis method is a robust tool for characterizing protein-RNA interactions.
- This platform offers a high-throughput, sensitive, and validated approach for studying specific molecular recognition events.
- The method has potential applications in drug discovery and screening for modulators of nucleic acid-protein interactions.
