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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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Proteomics01:33

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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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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: Feb 18, 2026

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling
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Top-down characterization of endogenous protein complexes with native proteomics.

Owen S Skinner1, Nicole A Haverland1, Luca Fornelli1,2

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois, USA.

Nature Chemical Biology
|November 14, 2017
PubMed
Summary

This study introduces native proteomics with multistage tandem mass spectrometry (MS) to analyze intact protein complexes. This method precisely characterizes complex composition, including modifications and cofactors, offering a new bridge to structural biology.

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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Area of Science:

  • Biochemistry and Molecular Biology
  • Proteomics
  • Structural Biology

Background:

  • Protein complexes are crucial for biological processes but exhibit complex variations in membership, modifications, and cofactors.
  • Current methods for analyzing these features lack throughput or specificity, limiting their use as direct analytical targets.
  • Understanding intact protein complex composition is essential for deciphering cellular functions.

Purpose of the Study:

  • To develop and apply a native proteomics approach using multistage tandem mass spectrometry (MS).
  • To characterize intact endogenous protein complexes and their associated proteoforms.
  • To enable precise compositional analysis of protein complexes as they exist in vivo.

Main Methods:

  • Application of native proteomics techniques.
  • Utilized a multistage tandem mass spectrometry (MS) approach.
  • Analyzed samples from mouse heart and human cancer cell lines.

Main Results:

  • Successfully characterized 125 intact endogenous protein complexes and 217 distinct proteoforms.
  • Native conditions preserved protein-protein interactions, noncovalent cofactors, and covalent modifications.
  • Demonstrated the ability to detect labile ligands, such as superoxide bound to superoxide dismutase 2.

Conclusions:

  • Native proteomics with multistage tandem MS provides high throughput and molecular specificity for analyzing intact protein complexes.
  • This approach enables precise compositional analysis, revealing in-cell molecular states.
  • The method serves as a bridge between proteomics and structural biology, advancing the study of complex biological machinery.