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Related Concept Videos

Protein Networks02:26

Protein Networks

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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.
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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Tagging and Fusion Proteins01:24

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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Affinity Chromatography01:03

Affinity Chromatography

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Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
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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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Related Experiment Video

Updated: Apr 16, 2026

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling
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Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling

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Affinity proteomics to study endogenous protein complexes: pointers, pitfalls, preferences and perspectives.

John LaCava1,2, Kelly R Molloy3, Martin S Taylor4

  • 1Laboratory of Cellular and Structural Biology, The Rockefeller University, New York.

Biotechniques
|March 12, 2015
PubMed
Summary
This summary is machine-generated.

Affinity capture techniques precisely isolate protein complexes from cell extracts. This method, combined with mass spectrometry, is crucial for studying cellular systems and protein interactions.

Keywords:
affinityinteractomicsprotein complexprotein purificationproteomics

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Area of Science:

  • Molecular Biology
  • Proteomics
  • Cellular Biology

Background:

  • Studying cellular systems necessitates isolating specific proteins and their complexes.
  • Affinity capture uses high-affinity reagents for targeted protein isolation.

Purpose of the Study:

  • To outline effective procedures for affinity capture of protein complexes.
  • To highlight best practices and common pitfalls in affinity capture techniques.

Main Methods:

  • Utilizing high affinity, high specificity reagents for protein targeting.
  • Employing affinity capture coupled with mass spectrometry (MS).
  • Applying these methods to cell extracts for protein complex isolation.

Main Results:

  • Successful isolation and characterization of a wide range of endogenous protein complexes.
  • Demonstration of effective procedures for affinity capture.
  • Identification of common pitfalls to avoid in experimental design.

Conclusions:

  • Affinity capture coupled with MS is a powerful approach for protein complex analysis.
  • Effective procedures and awareness of pitfalls enhance the study of cellular systems.
  • This technique is vital for understanding protein interactions and cellular functions.