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Protein-protein Interfaces02:04

Protein-protein Interfaces

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 polypeptide...
Protein Networks02:26

Protein Networks

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.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...

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The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis
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The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis

Published on: March 17, 2010

Measuring protein-protein interactions using Biacore.

Paul Leonard1, Stephen Hearty, Richard O'Kennedy

  • 1School of Biotechnology and Biomedical Diagnostics Institute, Dublin City University, Dublin, Ireland.

Methods in Molecular Biology (Clifton, N.J.)
|October 28, 2010
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 kinetic characterization of antibody fragments from bacterial lysates for macromolecular interaction studies.

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Area of Science:

  • Biotechnology
  • Biophysics
  • Molecular Biology

Background:

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

Purpose of the Study:

  • To equip users with the knowledge to design and perform kinetic experiments on Biacore.
  • To provide practical guidance on Biacore system maintenance and assay setup.
  • To demonstrate a protocol for kinetic characterization of antibody fragments from crude lysates.

Main Methods:

  • Utilizing Biacore surface plasmon resonance (SPR) technology for kinetic analysis.
  • Implementing an antibody affinity capture approach for sample preparation.
  • Characterizing single chain Fv (scFv) antibody fragments from bacterial lysates.

Main Results:

  • The protocol successfully enables kinetic characterization of scFv fragments from complex biological matrices.
  • Demonstrates the capture of HA-tagged scFv fragments using an anti-HA tag antibody surface.
  • Highlights the universal applicability of the methodology for various affinity pairs and Biacore systems.

Conclusions:

  • The described methods offer a robust approach for kinetic analysis of biomolecular interactions using Biacore.
  • Effective sample preparation and affinity capture are crucial for successful kinetic characterization.
  • The protocol is adaptable for diverse research applications involving molecular binding studies.