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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 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-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-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 Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:13

Protein Organization

Overview

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Related Experiment Video

Updated: Jun 12, 2026

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells
08:38

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells

Published on: March 3, 2015

Structural interpretation of protein-protein interaction network.

Ataur R Katebi1, Andrzej Kloczkowski, Robert L Jernigan

  • 1L.H. Baker Center for Bioinformatics and Biological Statistics, Iowa State University, Ames, Iowa 50011-0320, USA.

BMC Structural Biology
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

This study refines protein functional clusters by analyzing protein-protein interactions. It identifies exclusive and cooperative interactions, proposing new protein complexes and their stabilities.

More Related Videos

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation
07:57

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation

Published on: August 21, 2019

Related Experiment Videos

Last Updated: Jun 12, 2026

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells
08:38

Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells

Published on: March 3, 2015

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation
07:57

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation

Published on: August 21, 2019

Area of Science:

  • Computational Biology
  • Systems Biology
  • Structural Biology

Background:

  • Vast amounts of protein-protein interaction data are generated by high-throughput experiments.
  • Identifying functional protein clusters is crucial but challenging due to experimental errors like false positives and missing interactions.
  • Accurate functional cluster identification requires understanding interaction exclusivity, cooperativity, and binding affinities.

Purpose of the Study:

  • To cluster protein-protein interaction networks and investigate functional relationships within clusters.
  • To predict protein-protein interaction complexes and characterize binding sites to assess interaction strength.
  • To uncover new interactions and propose higher-order protein complexes within identified clusters.

Main Methods:

  • Utilized a spectral clustering method to analyze the yeast protein-protein interaction network.
  • Built 3D protein structural models using data from the Protein Data Bank or comparative modeling.
  • Employed rigid body protein docking (Cluspro) to predict protein complexes and analyzed buried surface areas to quantify interaction strength.

Main Results:

  • The spectral clustering approach successfully identified functionally coherent protein clusters.
  • Some interactions within clusters were found to be mutually exclusive due to shared binding sites.
  • New protein-protein interactions were discovered, leading to the proposal of higher-order complexes with reported relative stabilities.

Conclusions:

  • The computational methods, despite being resource-intensive, can accurately identify mutually exclusive and cooperative protein interactions.
  • Indirect interactions mediated by intermediate proteins were also identified.
  • These predictions offer valuable insights for crystallographers in selecting protein complex targets for X-ray crystallography.