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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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The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis
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Measuring Protein-Protein Interactions Using Biacore.

Paul Leonard1,2,3, Stephen Hearty1,2,3, Hui Ma1

  • 1Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland.

Methods in Molecular Biology (Clifton, N.J.)
|October 13, 2016
PubMed
Summary
This summary is machine-generated.

This guide provides essential tools for designing and executing kinetic experiments using Biacore optical biosensors. It details sample preparation and analysis for macromolecular interactions, specifically characterizing single chain Fv (scFv) antibody fragments.

Keywords:
AntibodyBiacoreBiosensor analysisKineticsProtein–protein interactionsSurface plasmon resonance

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Determination of High-affinity Antibody-antigen Binding Kinetics Using Four Biosensor Platforms
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Determination of High-affinity Antibody-antigen Binding Kinetics Using Four Biosensor Platforms

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Area of Science:

  • Biophysics
  • Biochemistry
  • Molecular Biology

Background:

  • Optical biosensors are increasingly vital for studying macromolecular interactions.
  • The growing volume of biosensor data necessitates clear experimental guidance.
  • Biacore systems are widely used for kinetic analysis of molecular binding.

Purpose of the Study:

  • To equip users with the necessary tools for preparing, designing, and executing kinetic experiments on Biacore systems.
  • To provide practical tips for efficient Biacore-based studies.
  • To detail a protocol for kinetic characterization of antibody fragments from crude lysates.

Main Methods:

  • Utilizing Biacore for kinetic analysis of molecular interactions.
  • Implementing rigorous sample preparation and purification techniques.
  • Employing an antibody affinity capture approach for characterizing single chain Fv (scFv) antibody fragments from bacterial lysates.

Main Results:

  • Demonstrated a method for kinetic characterization of HA-tagged scFv antibody fragments using an anti-HA tag antibody surface.
  • The described methodologies are universally applicable to various affinity pairs and Biacore systems.
  • Successful kinetic analysis was performed directly from crude bacterial lysates.

Conclusions:

  • The protocol enables efficient kinetic characterization of antibody fragments using Biacore.
  • The antibody affinity capture method is robust and adaptable for diverse biomolecular interaction studies.
  • This approach simplifies the analysis of macromolecular interactions, even with complex sample matrices.