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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 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 Organization01:24

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 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,...

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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
09:51

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

Understanding protein-protein interactions using local structural features.

Joan Planas-Iglesias1, Jaume Bonet, Javier García-García

  • 1Structural Bioinformatics Group (GRIB-IMIM), Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, C/Dr. Aiguader 88, 08003 Barcelona, Catalonia, Spain.

Journal of Molecular Biology
|January 29, 2013
PubMed
Summary
This summary is machine-generated.

Structural features, including loops and domains, are key to understanding protein-protein interactions (PPIs). This study reveals that both interacting and non-interacting protein surfaces influence binding, aiding in PPI prediction.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Bioinformatics

Background:

  • Protein-protein interactions (PPIs) are crucial for cellular functions and understanding biological systems.
  • Identifying the interactome aids in elucidating key molecular mechanisms.
  • A paradox exists in how proteins rapidly recognize specific binding partners and interfaces.

Purpose of the Study:

  • To investigate the role of structural features (loops and domains) in protein-protein binding.
  • To classify structural determinants of interacting and non-interacting protein pairs.
  • To develop a predictive method for PPIs based on structural features.

Main Methods:

  • Analysis of interacting and non-interacting protein pairs.
  • Classification of structural features influencing binding.
  • Development and testing of a PPI prediction method using these features.

Main Results:

  • Both the interacting region and the overall protein surface are critical for interaction outcomes.
  • A balance of favoring and disfavoring structural features dictates protein interaction.
  • The findings support the funnel-like intermolecular energy landscape theory for PPIs.

Conclusions:

  • Structural features beyond the immediate binding site significantly impact protein-protein interactions.
  • A novel method for PPI prediction was developed, achieving >25% accuracy in challenging conditions.
  • The study provides insights into the molecular mechanisms governing protein recognition and binding.