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Related Concept Videos

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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Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions
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A quantitative proteomics-based competition binding assay to characterize pITAM-protein interactions.

Lianghai Hu1, Li Yang, Andrew M Lipchik

  • 1Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907, United States.

Analytical Chemistry
|April 25, 2013
PubMed
Summary

Researchers developed a new method combining competition binding assays with mass spectrometry to study ligand-protein interactions. This approach efficiently identifies binding partners and measures their relative affinities in a single experiment.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Drug Discovery

Background:

  • Ligand-protein binding characterization is vital for drug discovery.
  • Traditional methods often use single proteins and are not high-throughput.

Purpose of the Study:

  • To introduce a high-throughput method for studying ligand-protein interactions.
  • To characterize interactions of a phosphorylated immunoreceptor tyrosine-based activation motif (pITAM) peptide in human lymphocytes.

Main Methods:

  • Coupling competition binding assays with mass spectrometry-based quantitative proteomics.
  • Using a pITAM peptide as a model system.
  • Analyzing competition binding curves to determine relative affinities.

Main Results:

  • Successfully identified pITAM-interacting partners in human lymphocytes.
  • Distinguished specific interacting proteins, including SYK, ZAP-70, CSK, and PI3K, from contaminants.
  • Measured relative binding affinities of multiple proteins in a single experiment.

Conclusions:

  • The developed strategy offers an efficient high-throughput approach for ligand-protein interaction studies.
  • This method aids in identifying specific binding partners and quantifying relative affinities.
  • Applicable to understanding interactions involving SH2 domain-containing proteins.