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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...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Ligand Binding Sites02:40

Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

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Related Experiment Video

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Detection of Heterodimerization of Protein Isoforms Using an in Situ Proximity Ligation Assay
09:18

Detection of Heterodimerization of Protein Isoforms Using an in Situ Proximity Ligation Assay

Published on: October 20, 2018

Interaction modes at protein hetero-dimer interfaces.

Ayyappan Vaishnavi1, Gopichandran Sowmya, Jayaseelan Kalaivanii

  • 1Biomedical Informatics, Pondicherry 607 402, India; Equal contributions; Pandjassarame Kangueane.

Bioinformation
|October 28, 2010
PubMed
Summary
This summary is machine-generated.

Understanding protein interactions is key in molecular biology. This study explores physical and chemical features of hetero-dimer interfaces, crucial for predicting protein binding sites from sequences.

Keywords:
interfacemode of interactionprotein sizeprotein-protein interaction

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09:18

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biophysics

Background:

  • Heterodimer interfaces are vital for biological catalysis and regulation, forming active sites critical for cellular events.
  • Numerous physical and chemical factors influence these interfaces, often acting in complex, combinatorial ways.
  • Predicting protein interaction partners and sites from sequences remains a significant challenge despite documented features since 1975.

Purpose of the Study:

  • To investigate the physical and chemical features of heterodimer interfaces.
  • To assess the utility of these features in predicting protein interaction partners and sites from sequence data.

Main Methods:

  • Analysis of a non-redundant dataset comprising 156 heterodimer structures obtained via X-ray crystallography.
  • Examination of subunit size variation (small-small, large-large, medium-medium, large-small, large-medium, small-medium) as a factor in interface formation.
  • Identification of interaction regions within protein sequences: N-terminal (N), C-terminal (C), and middle (M).

Main Results:

  • Subunit size variation significantly influences the mode of heterodimer interface formation.
  • The physical location of interactions (N, C, or M regions) is a key characteristic of these interfaces.
  • Existing interaction features show potential for sequence-based prediction but their application is not yet fully established.

Conclusions:

  • Heterodimer interface formation is governed by a combination of subunit size and the specific regions involved in physical interactions.
  • Further research is needed to effectively leverage these identified features for accurate prediction of protein-protein interactions directly from amino acid sequences.