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Related Concept Videos

Protein Networks02:26

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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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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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Protein Complexes with Interchangeable Parts01:57

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Related Experiment Video

Updated: Mar 3, 2026

Label-Free Immunoprecipitation Mass Spectrometry Workflow for Large-scale Nuclear Interactome Profiling
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There is no human interactome.

Michael P Washburn1,2

  • 1Stowers Institute for Medical Research, Kansas City, MO, 64110, USA. mpw@stowers.org.

Genome Biology
|March 16, 2016
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Summary
This summary is machine-generated.

Protein complexes change dynamically. New proteomic data analysis reveals cell type-specific stoichiometry shifts in protein complexes, frequently involving paralog switching.

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Area of Science:

  • Proteomics
  • Molecular Biology
  • Cell Biology

Background:

  • Protein complexes are crucial for cellular functions.
  • The dynamic nature of protein complexes is increasingly recognized.
  • Understanding complex stoichiometry is key to cellular regulation.

Purpose of the Study:

  • To investigate cell type-specific changes in protein complex stoichiometry.
  • To identify mechanisms driving these stoichiometric alterations, such as paralog switching.

Main Methods:

  • Analysis of two large-scale quantitative proteomic datasets.
  • Computational methods to assess protein complex composition and stoichiometry.
  • Comparison of proteomic profiles across different cell types.

Main Results:

  • Demonstrated significant cell type-specific variations in the stoichiometry of numerous protein complexes.
  • Identified paralog switching as a common mechanism influencing complex composition.
  • Quantified the extent of paralog involvement in altering complex stoichiometry.

Conclusions:

  • Protein complex stoichiometry is highly adaptable and cell type-specific.
  • Paralog switching is a significant regulatory mechanism impacting protein complex dynamics.
  • These findings provide new insights into the regulation of cellular processes through protein complex remodeling.