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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-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...
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...

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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

GIBA: a clustering tool for detecting protein complexes.

Charalampos N Moschopoulos1, Georgios A Pavlopoulos, Reinhard Schneider

  • 1Pattern Recognition Lab, Department of Computer Engineering & Informatics, University of Patras, Patra, Rio, GR-26500, Greece. mosxopul@ceid.upatras.gr

BMC Bioinformatics
|June 19, 2009
PubMed
Summary
This summary is machine-generated.

GIBA is a new tool that accurately detects protein complexes from protein-protein interaction data. It outperforms existing methods in predicting protein complexes from noisy experimental data.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Systems Biology

Background:

  • High-throughput methods generate large protein-protein interaction (PPI) datasets.
  • Experimental PPI data often contains false positives, reducing data quality.
  • PPI data can be modeled as graphs for clustering analysis.

Purpose of the Study:

  • Introduce GIBA, a novel clustering tool for PPI data analysis.
  • Develop an effective method for detecting protein complexes from noisy PPI networks.

Main Methods:

  • GIBA employs a two-step procedure: clustering followed by filtering.
  • The tool processes protein-protein interaction data to identify potential protein complexes.

Main Results:

  • GIBA was evaluated on six yeast PPI datasets, outperforming four other algorithms.
  • Performance was assessed using five distinct metrics, demonstrating GIBA's superior prediction accuracy.
  • The impact of filter parameters on prediction outcomes was analyzed.

Conclusions:

  • GIBA is an effective and user-friendly tool for identifying protein complexes.
  • The tool accurately predicts protein complexes from experimentally derived PPI networks.
  • GIBA exhibits higher prediction accuracy compared to previously published methods.