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An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
Published on: November 29, 2016
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EMSA Analysis of DNA Binding By Rgg Proteins
Breah LaSarre1, Michael J Federle2
1Microbiology and Immunology, University of Illinois at Chicago, Chicago, USA.
Bio-Protocol
|July 19, 2016
Summary
Electrophoretic mobility shift assay (EMSA) visualizes bacterial protein-DNA interactions. This method confirms Rgg transcriptional regulator targets and binding sites, revealing how signaling peptides modulate their DNA-binding activity.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Bacterial gene expression relies on protein-DNA interactions for regulation.
- Rgg proteins are widespread transcriptional regulators in Firmicutes.
- Some Rgg proteins act independently, while others mediate cell-to-cell communication via signaling peptides.
Purpose of the Study:
- To demonstrate the utility of Electrophoretic Mobility Shift Assay (EMSA) for studying Rgg protein activity.
- To confirm regulatory targets and binding sites of Rgg proteins.
- To characterize the mechanism of Rgg protein regulation by signaling peptides.
Main Methods:
- Electrophoretic Mobility Shift Assay (EMSA) was employed to visualize protein-DNA interactions.
- DNA probe mutagenesis was used to identify precise DNA binding sites.
- In vitro assays were performed to assess Rgg protein binding and modulation.
Main Results:
- EMSA successfully confirmed DNA binding of Rgg proteins.
- Specific DNA binding sites for Rgg proteins were identified.
- The mechanism of Rgg protein regulation by signaling peptides, including interruption of DNA-binding, was characterized.
Conclusions:
- EMSA is a valuable tool for analyzing Rgg protein-DNA interactions and function.
- This study confirmed Rgg targets and elucidated mechanisms of peptide-mediated regulation.
- Understanding Rgg protein activity is crucial for bacterial gene regulation and communication.
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