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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

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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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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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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 Interactions: Pull-Down Assays.

Arthur Louche1, Suzana P Salcedo1, Sarah Bigot2

  • 1Molecular Microbiology and Structural Biochemistry, CNRS UMR 5086, Université Lyon 1, Institut de Biologie et Chimie des Protéines, 7 Passage du Vercors, 69 367, Lyon Cedex 07, France.

Methods in Molecular Biology (Clifton, N.J.)
|July 2, 2017
PubMed
Summary
This summary is machine-generated.

Investigating protein-protein interactions is key to understanding biological pathways. This chapter details the pull-down assay, a method using affinity purification to detect interactions between bacterial and eukaryotic proteins.

Keywords:
Affinity purificationProtein–protein interactionsPull-downTagged protein

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Understanding protein function requires identifying protein partners and their interactions.
  • Protein-protein interactions are crucial for elucidating biological pathways.
  • Various methods exist for studying these interactions, with pull-down assays being a key technique.

Purpose of the Study:

  • To describe the methodology of the pull-down assay for detecting protein-protein interactions.
  • To provide a guide for confirming predicted interactions or discovering novel protein partners.
  • To illustrate the application of pull-down experiments for both bacterial and bacterial-eukaryotic protein pairs.

Main Methods:

  • The pull-down assay utilizes affinity purification to isolate interacting proteins.
  • The method involves specific wash and elution steps to ensure specificity.
  • Experiments can be performed with purified bacterial proteins or a combination of bacterial and eukaryotic proteins.

Main Results:

  • The pull-down assay effectively detects physical interactions between proteins in vitro.
  • This technique serves as a valuable tool for validating predicted protein-protein interactions.
  • Novel interacting partners can be identified using this method.

Conclusions:

  • The pull-down assay is a robust and versatile method for studying protein-protein interactions.
  • It is applicable to diverse biological systems, including bacterial and eukaryotic proteins.
  • This technique is essential for advancing the understanding of protein function and biological pathways.