Rapid agarose gel electrophoretic mobility shift assay for quantitating protein: RNA interactions

Area of Science:

• Biochemistry
• Molecular Biology
• Biophysics

Background:

• Electrophoretic mobility shift assays (EMSAs) are crucial for analyzing protein:nucleic acid interactions.
• Traditional EMSA methods commonly use polyacrylamide gels, which can be time-consuming.
• Advances in agarose gel electrophoresis offer potential for improved EMSA protocols.

Purpose of the Study:

• To develop a simpler and faster EMSA protocol using agarose gel electrophoresis.
• To optimize parameters for high-voltage agarose gel EMSA.
• To validate the new method against traditional polyacrylamide gel EMSA.

Main Methods:

• Utilized high-voltage (≥20 V/cm) agarose gel electrophoresis with 0.5 × Tris-borate (TB) buffer.
• Optimized gel thickness, agarose percentage, and applied voltage for band and image quality.
• Investigated the association of siRNA-binding protein p19 with its target RNA.

Main Results:

• Demonstrated that high-voltage agarose gel EMSA can be performed with short run times (5-10 min) and high band resolution.
• Optimized several parameters, including gel thickness, agarose percentage, and voltage.
• Observed similar apparent binding constants compared to conventional polyacrylamide gel EMSA.

Conclusions:

• High-voltage agarose gel EMSA is a viable, faster, and simpler alternative to polyacrylamide gel methods.
• The reduced run times minimize complex dissociation, improving accuracy in binding experiments.
• This optimized protocol enhances the efficiency of analyzing protein:nucleic acid interactions.