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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 and Protein Structure02:15

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
Protein Folding01:22

Protein Folding

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Related Experiment Video

Updated: Jun 15, 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 features and evolution of protein-protein interactions.

Joachim Von Eichborn1, Stefan Günther, Robert Preissner

  • 1Structural Bioinformatics Group, Institute for Physiology, Charité-University Medicine, Arnimallee 22, 14195 Berlin, Germany. joachim.eichborn@charite.de

Genome Informatics. International Conference on Genome Informatics
|March 19, 2010
PubMed
Summary

Analyzing protein interactions reveals that complementary amino acids drive binding and conserved residues form critical "hot spots." These findings enhance understanding of molecular recognition and protein binding site prediction.

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

  • Structural biology
  • Bioinformatics
  • Evolutionary biology

Background:

  • Protein-protein complexes are crucial for cellular functions and molecular recognition.
  • Determining complex structures is challenging, but recent advances have increased available data.
  • Understanding interaction interfaces aids in predicting protein binding sites.

Purpose of the Study:

  • To analyze interfaces of transient and obligate protein interactions.
  • To understand molecular recognition mechanisms.
  • To identify features for protein binding site prediction.

Main Methods:

  • Analysis of 750 transient and 2,000 obligate protein interactions.
  • Calculation of knowledge-based potentials for amino acid contacts.
  • Assessment of amino acid conservation at interaction interfaces.

Main Results:

  • Amino acids with complementary physicochemical properties show a preference for contact.
  • Protein binding sites exhibit a weak but significant evolutionary conservation compared to solvent-exposed surfaces.
  • Highly conserved residues form contacts more frequently than expected, supporting the "hot spot" theory.

Conclusions:

  • Complementary physicochemical properties and evolutionary conservation are key features of protein interaction interfaces.
  • Transient and obligate interactions are shaped by different evolutionary pressures.
  • Findings contribute to improved protein binding site prediction models.