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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Pulldown Assay Coupled with Co-Expression in Bacteria Cells as a Time-Efficient Tool for Testing Challenging Protein-Protein Interactions
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Protein-Protein Interaction: Bacterial Two Hybrid.

Gouzel Karimova1, Emilie Gauliard1,2, Marilyne Davi1

  • 1Unité de Biochimie des Interactions Macromoléculaires, Département de Biologie Structurale et Chimie, Institut Pasteur, CNRS, UMR 3528, Paris, France.

Methods in Molecular Biology (Clifton, N.J.)
|November 6, 2023
PubMed
Summary

The Bacterial Adenylate Cyclase-based Two-Hybrid (BACTH) system detects protein interactions in vivo. It uses a cAMP signaling cascade in E. coli for versatile interaction analysis.

Keywords:
Chimeric proteinsMembrane proteinProtein interaction assayTwo-hybrid systemcAMP signaling

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Protein-protein interactions are crucial for cellular functions.
  • Existing methods for studying these interactions can be limited in scope or complexity.
  • A need exists for versatile and efficient in vivo interaction detection systems.

Purpose of the Study:

  • To describe the Bacterial Adenylate Cyclase-based Two-Hybrid (BACTH) system.
  • To explain its principle and application for studying protein-protein interactions in vivo.
  • To highlight its advantages for analyzing interactions in various cellular compartments.

Main Methods:

  • Utilizes the reconstitution of a cAMP signaling cascade in Escherichia coli.
  • Employs chimeric proteins that activate transcription upon interaction.
  • Leverages a diffusible cAMP messenger for spatial separation of interaction and readout.

Main Results:

  • The BACTH system enables detection of protein-protein interactions in vivo.
  • It allows analysis of interactions occurring in the cytosol, inner membrane, or involving DNA-binding proteins.
  • The system facilitates simultaneous functional and association state analysis of proteins.

Conclusions:

  • The BACTH system is a simple, fast, and versatile genetic tool for studying protein-protein interactions.
  • Its design allows for the analysis of interactions in diverse cellular locations and contexts.
  • It provides a valuable method for in vivo protein interaction characterization in bacteria.