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An Assay for Quantifying Protein-RNA Binding in Bacteria
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An Assay for Quantifying Protein-RNA Binding in Bacteria.

Noa Katz1, Roni Cohen2, Orna Atar2

  • 1Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology; katznoa@gmail.com.

Journal of Visualized Experiments : Jove
|July 2, 2019
PubMed
Summary

This study presents a novel method to quantify RNA binding protein (RBP) affinity for RNA sequences using a reporter assay in bacteria. The technique measures RBP binding by observing reporter gene expression changes, offering a simple yet effective approach.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Translation initiation is a critical step in protein synthesis.
  • RNA binding proteins (RBPs) regulate gene expression by binding to mRNA.
  • RBP binding to mRNA can interfere with ribosome recruitment, blocking translation initiation.

Purpose of the Study:

  • To develop a method for quantifying the binding affinity of RBPs to specific RNA sequences.
  • To enable comparison of binding affinities for different RBPs and RNA sites in a bacterial system.

Main Methods:

  • A reporter mRNA with a test binding site in the initiation region was designed.
  • Expression of a test RBP was induced in live bacterial cells.
  • Reporter gene expression was measured as a function of RBP concentration to assess binding affinity.

Main Results:

  • Sigmoidal repression of reporter expression was observed upon RBP binding to the target site.
  • No significant repression occurred when RBP had low or no affinity for the binding site.
  • The method demonstrated effectiveness in live bacterial cells without complex equipment.

Conclusions:

  • The developed method accurately quantifies RBP-RNA binding affinities in bacteria.
  • This technique provides a cost-effective and accessible tool for studying RBP-RNA interactions.
  • The method's applicability may be limited for RNA binding sites with high structural complexity.