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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 Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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Comparing interfacial dynamics in protein-protein complexes: an elastic network approach.

Andrea Zen1, Cristian Micheletti, Ozlem Keskin

  • 1SISSA, Democritos CNR-IOM and Italian Institute of Technology, Via Bonomea 265, 34136 Trieste, Italy.

BMC Structural Biology
|August 10, 2010
PubMed
Summary

Protein interface dynamics influence complex formation. Computational analysis reveals reduced interfacial mobility in bound dimers, varying by interface type and obligate nature, suggesting distinct stabilization mechanisms.

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Area of Science:

  • Structural Biology
  • Computational Biophysics
  • Protein Dynamics

Background:

  • Protein-protein interactions are crucial for biological regulation.
  • Interface complementarity is key for dimer formation.
  • The role of dynamics in protein interfaces remains less understood.

Purpose of the Study:

  • To investigate dynamics-based aspects of protein-protein interfaces.
  • To characterize the mobility of amino acids at protein-protein interfaces.
  • To compare interface dynamics in bound versus unbound protein forms.

Main Methods:

  • Utilized an elastic network model for analyzing 22 representative dimers.
  • Classified dimers into three interface types (I, II, III).
  • Computed and compared amino acid mobility at interfaces in bound and unbound states.

Main Results:

  • Interfacial amino acid mobility is generally lower than other surface residues.
  • Dynamic patterns differ across interface types and for obligate vs. non-obligate complexes.
  • Interfacial mobility reduction upon binding is significant for Type I interfaces, less so for Type II.

Conclusions:

  • Protein interface dynamics are modulated by complex formation.
  • Interface type, size, and obligate nature influence interfacial mobility changes.
  • Different interface types may employ distinct enthalpy-entropy balances for stabilization.