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Related Concept Videos

Protein Networks02:26

Protein Networks

4.0K
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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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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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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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.
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...
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Protein Complex Assembly02:41

Protein Complex Assembly

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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...
10.6K
Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

6.5K
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
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Protein Families02:47

Protein Families

15.4K
Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism.   Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members.   If these new proteins contain similar amino acids in key...
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Related Experiment Video

Updated: Jul 17, 2025

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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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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Protein Complex Identification Based on Heterogeneous Protein Information Network.

Peixuan Zhou1, Yijia Zhang1, Zeqian Li1

  • 1School of Information Science and Technology, Dalian Maritime University, Dalian, China.

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|September 5, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for identifying protein complexes by integrating Gene Ontology (GO) information into protein-protein interaction networks. The approach enhances accuracy by considering both network structure and biological attributes.

Keywords:
attention mechanismprotein complexesprotein information networkrepresentation learning

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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:

  • Bioinformatics
  • Computational Biology
  • Systems Biology

Background:

  • Protein complexes are essential for cellular functions.
  • Accurate identification of protein complexes aids in understanding cellular systems.
  • Existing methods often fail to integrate network topology and biological attributes effectively.

Purpose of the Study:

  • To propose a novel method for protein complex identification.
  • To address limitations of existing methods in integrating network and attribute information.
  • To improve the accuracy of protein complex discovery.

Main Methods:

  • Developed a GO attribute Heterogeneous Attention network Embedding (GHAE) method.
  • Constructed a heterogeneous protein information network by incorporating Gene Ontology (GO) data.
  • Employed a dual attention mechanism and heterogeneous graph convolutional representation learning.

Main Results:

  • Heterogeneous protein information networks effectively integrate biological data.
  • The GHAE method successfully mines features from both protein and GO attributes.
  • Experimental results demonstrate improved performance in protein complex identification.

Conclusions:

  • Integrating diverse biological information into heterogeneous networks enhances protein complex identification.
  • The GHAE method offers a powerful approach for uncovering protein complex structures.
  • This work advances bioinformatics tools for cellular system analysis.