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Related Concept Videos

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 Organization01:13

Protein Organization

Overview
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...

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Structural deformation upon protein-protein interaction: a structural alphabet approach.

Juliette Martin1, Leslie Regad, Hélène Lecornet

  • 1Equipe de Bioinformatique Génomique et Moléculaire, INSERM UMRS726/Université Denis Diderot Paris 7, F-75005 Paris, France. juliette.martin@jouy.inra.fr

BMC Structural Biology
|March 1, 2008
PubMed
Summary

Protein binding involves significant structural changes, known as induced fit. This study quantifies these local structure modifications using a structural alphabet, revealing key insights for flexible protein docking.

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Area of Science:

  • Structural biology
  • Computational biology
  • Biochemistry

Background:

  • Protein-protein interactions often involve significant conformational changes.
  • The induced fit hypothesis posits that binding partners alter their structures upon complex formation.

Purpose of the Study:

  • To quantitatively analyze local structural modifications in proteins undergoing induced fit.
  • To develop a method for describing and analyzing these changes using a structural alphabet.

Main Methods:

  • Analysis of 124 proteins in both bound and unbound states.
  • Utilizing a structural alphabet of 27 letters to represent local backbone structure.
  • Comparison with a control set to differentiate induced fit from natural flexibility and experimental error.

Main Results:

  • Induced fit significantly alters local protein structure, with 36% of structural letters modified upon binding, compared to 28% in controls.
  • Interface regions show even higher modification rates (41%) and preferentially involve coil structures.
  • Certain coil structural letters are disfavored at interfaces, and the extent of modification varies.

Conclusions:

  • This study provides quantitative insights into the local structural changes associated with induced fit.
  • The derived structural letter substitution matrix can aid in identifying binding motifs and improving flexible docking algorithms.