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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...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
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Protein Folding

Overview
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...

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

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Types of interfaces for homodimer folding and binding.

Velmurugan Karthikraja1, Abishek Suresh, Sajitha Lulu

  • 1Biomedical Informatics, Pondicherry 607402, India.

Bioinformation
|March 4, 2010
PubMed
Summary

Understanding protein homodimer folding mechanisms is key for catalysis and regulation. This study analyzes interface structural features across 47 homodimers, revealing distinct folding pathways based on interface size and interaction types.

Keywords:
homodimerinteractioninterfacemodestructurestypes

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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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Area of Science:

  • Biochemistry and Structural Biology
  • Protein Folding and Dynamics

Background:

  • Homodimers play crucial roles in biological catalysis and regulation via stable interfaces.
  • Protein homodimer folding mechanisms are diverse, including two-state (2S), three-state with monomer intermediate (3SMI), and three-state with dimer intermediate (3SDI) pathways.
  • Existing structural features provide limited insight into these distinct folding mechanisms.

Purpose of the Study:

  • To investigate the types of interfaces in protein homodimers.
  • To correlate interface structural features with known homodimer folding mechanisms (2S, 3SMI, 3SDI).
  • To develop a classification system for homodimer interfaces based on size and interaction patterns.

Main Methods:

  • Analysis of an extended dataset comprising 47 homodimers (28 2S, 12 3SMI, 7 3SDI).
  • Quantification of interface size using the ratio of interface to total residues (I/T).
  • Categorization of interfaces into large (>>50%), moderate (50-25%), and small (<<25%) I/T ratios.
  • Two-dimensional (2D) representation and analysis of physical interaction types at the interfaces.

Main Results:

  • Homodimers were grouped into large, moderate, and small I/T interface categories.
  • 2S homodimers typically exhibit large I/T ratios with extensive inter-subunit communication.
  • 3SMI homodimers show low I/T ratios with gentle, touch-like inter-subunit contacts.
  • 3SDI homodimers also display low I/T ratios, characterized by deep but localized inter-subunit interactions.

Conclusions:

  • Interface size (I/T ratio) and interaction type are critical determinants of homodimer folding mechanisms.
  • Distinct interface structural features correlate strongly with 2S, 3SMI, and 3SDI folding pathways.
  • The developed classification provides a framework for understanding homodimer assembly and function.