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Related Concept Videos

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 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 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

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Identifying Protein-protein Interaction Sites Using Peptide Arrays
07:44

Identifying Protein-protein Interaction Sites Using Peptide Arrays

Published on: November 18, 2014

Structural similarity and classification of protein interaction interfaces.

Nan Zhao1, Bin Pang, Chi-Ren Shyu

  • 1Informatics Institute and Department of Computer Science, University of Missouri, Columbia, Missouri, United States of America.

Plos One
|May 19, 2011
PubMed
Summary

We developed a new machine learning method to identify similar protein-protein interaction interfaces, even when protein structures are unrelated. This approach aids in understanding protein complex evolution and stability.

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Genome-wide Protein-protein Interaction Screening by Protein-fragment Complementation Assay (PCA) in Living Cells
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Identifying Protein-protein Interaction Sites Using Peptide Arrays
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Published on: November 18, 2014

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
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Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions

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

Published on: March 3, 2015

Area of Science:

  • Biochemistry and Structural Biology
  • Computational Biology and Bioinformatics
  • Machine Learning in Biology

Background:

  • Protein-protein interactions (PPIs) are crucial for cellular functions.
  • Understanding interface similarity aids in studying PPI evolution and protein complex stability.
  • Detecting similarity between complexes with structurally unrelated subunits is challenging.

Purpose of the Study:

  • To develop an alignment-free machine learning approach for measuring protein interface similarity.
  • To classify protein-protein interactions based on interface similarity.
  • To analyze conservation patterns in homologous and unrelated protein interfaces.

Main Methods:

  • Feature-based representation of protein interfaces, independent of subunit superposition.
  • Support Vector Machine (SVM) classifier for similar/dissimilar interfaces.
  • Derivation of a feature-based interface similarity measure.
  • Application to a large dataset of protein complex pairs for hierarchical classification.

Main Results:

  • An alignment-free machine learning method accurately measures protein interface similarity.
  • A hierarchical classification of protein-protein interactions was constructed.
  • Analysis revealed complex conservation patterns of charged residues in homologous interfaces.

Conclusions:

  • The developed method effectively identifies similar protein interfaces without structural superposition.
  • The findings contribute to understanding the evolution and dynamics of protein complexes.
  • Conservation of charged residues in homologous interfaces is more intricate than previously thought.