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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 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
Protein Organization01:13

Protein Organization

Overview

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Related Experiment Video

Updated: Jul 11, 2026

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
06:50

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

Published on: January 26, 2024

Characterization of protein-protein interfaces.

Changhui Yan1, Feihong Wu, Robert L Jernigan

  • 1Department of Computer Science, Utah State University, 4205 Old Main Hill, Logan, UT 84341, USA. cyan@cc.usu.edu

The Protein Journal
|September 14, 2007
PubMed
Summary

Protein interfaces have unique residue compositions and interaction preferences compared to protein cores. This study reveals specific residue propensities, like increased hydrophobic and aromatic residues, in protein-protein interfaces.

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Last Updated: Jul 11, 2026

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues

Published on: July 14, 2015

Area of Science:

  • Structural biology
  • Biochemistry
  • Computational biology

Background:

  • Protein-protein interactions are fundamental to cellular processes.
  • Understanding the structural and chemical properties of protein interfaces is crucial for drug design and protein engineering.

Purpose of the Study:

  • To characterize the distinct features of protein-protein interfaces.
  • To identify residue composition and interaction preferences specific to interfaces, independent of solvent accessibility.

Main Methods:

  • Analysis of large datasets from the Protein Data Bank (PDB).
  • Comparison of interfaces with protein cores and non-interface surfaces.
  • Controlled analysis separating the effect of solvent accessibility.

Main Results:

  • Protein interfaces exhibit unique residue composition, sequence entropy, and secondary structure compared to cores and surfaces.
  • Hydrophobic and aromatic residues are enriched in interfaces.
  • Interfaces favor specific interactions, including opposite charge pairs, hydrophobic pairs, and notably, Pro-Trp pairs.

Conclusions:

  • Protein interfaces possess distinct characteristics driven by functional requirements, not solely by solvent accessibility.
  • The findings provide insights into the principles governing protein-protein recognition and binding.