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Related Concept Videos

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,...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
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 Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

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Related Experiment Video

Updated: May 28, 2026

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
14:58

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

Published on: November 12, 2012

A degree-distribution based hierarchical agglomerative clustering algorithm for protein complexes identification.

Liang Yu1, Lin Gao, Kui Li

  • 1School of Computer Science and Technology Xidian University, Xi'an 710071, China. lyu@xidian.edu.cn

Computational Biology and Chemistry
|October 18, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a new framework for identifying functional modules in protein-protein interaction (PPI) networks. The developed algorithm effectively detects protein complexes with high biological significance, improving upon existing methods.

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Last Updated: May 28, 2026

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:

  • Bioinformatics
  • Systems Biology
  • Computational Biology

Background:

  • Cellular functions are organized hierarchically.
  • Protein-protein interaction (PPI) networks represent these functional relationships.
  • Identifying modules within PPI networks is crucial for understanding cellular organization.

Purpose of the Study:

  • To propose a framework for identifying hierarchical modules in PPI networks.
  • To develop a quantitative measure for evaluating network partitioning.
  • To detect protein complexes with high biological significance.

Main Methods:

  • Formal module definition based on subgraph edge properties and degree distribution.
  • Quantitative measure for evaluating PPI network partition.
  • Hierarchical agglomerative clustering algorithm for complex detection.
  • Validation using gold standard protein complex sets.

Main Results:

  • The proposed method effectively identifies protein complexes.
  • Significant improvement in detecting biologically significant complexes compared to four other methods.
  • Predicted complexes, both dense and sparse, align well with known biological characteristics.

Conclusions:

  • The developed framework and algorithm provide an effective approach for module and complex detection in PPI networks.
  • The method enhances the understanding of hierarchical cellular organization.
  • This work offers a valuable tool for systems biology research.