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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
Detection of sRNA-mRNA interactions by electrophoretic mobility shift assay
Teppei Morita1, Kimika Maki, Hiroji Aiba
1Suzuka University of Medical Sciences, Suzuka, Japan.
Methods in Molecular Biology (Clifton, N.J.)
|June 28, 2012
Summary
This study details a method using electrophoretic mobility shift assays to analyze RNA-RNA interactions, specifically focusing on small RNA (sRNA) and messenger RNA (mRNA) binding. The technique can identify stable base pairing between regulatory RNAs and their targets.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- RNA-RNA interactions are crucial for gene regulation.
- Electrophoretic mobility shift assay (EMSA) is a common method for studying nucleic acid interactions.
- Analyzing interactions between small RNAs (sRNAs) and their messenger RNA (mRNA) targets is important for understanding post-transcriptional gene regulation.
Purpose of the Study:
- To describe a method for studying RNA-RNA interactions using EMSA.
- To demonstrate the application of EMSA for analyzing the binding of an Hfq-binding sRNA to its target mRNA.
- To provide a versatile method applicable to various sRNA-target mRNA interactions.
Main Methods:
- Utilizing a (32)P-labeled RNA probe incubated with an unlabeled RNA.
- Performing electrophoresis on a native polyacrylamide gel to separate RNA complexes.
- Observing band shifts indicative of stable RNA duplex formation.
Main Results:
- The electrophoretic mobility shift assay (EMSA) successfully detected RNA-RNA interactions.
- A distinct band shift was observed when the labeled probe RNA formed a stable duplex with the target RNA.
- The method was validated using the SgrS sRNA and its target ptsG mRNA.
Conclusions:
- EMSA is a simple, rapid, and sensitive technique for analyzing RNA-RNA interactions.
- The described method effectively studies the interaction between sRNAs and their mRNA targets.
- This approach is broadly applicable to investigating base pairing between diverse sRNAs and their targets.
