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Updated: Jan 19, 2026

Protein Complexes and Protein-Protein Interactions
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Small protein-protein interfaces rich in electrostatic are often linked to regulatory function.

Christina Nilofer1,2, Anshul Sukhwal3, Arumugam Mohanapriya2

  • 1Biomedical Informatics (P) Ltd., Pondicherry, India.

Journal of Biomolecular Structure & Dynamics
|September 10, 2019
PubMed
Summary

This study characterizes protein-protein interfaces using structural data, revealing that most interfaces are large with dominant van der Waals energy. A small subset of interfaces are smaller, electrostatically driven, and linked to regulatory functions.

Keywords:
H-bondsInterfaceelectrostaticinterface areaprotein–protein interactionvan der Waals (vdW)

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Area of Science:

  • Structural Biology
  • Biophysics
  • Computational Biology

Background:

  • Protein-protein interactions (PPIs) are fundamental to cellular processes, mediated by specific interfaces.
  • Understanding the structural and energetic characteristics of these interfaces is crucial for deciphering biological functions.

Purpose of the Study:

  • To analyze and categorize protein-protein interfaces based on their structural and energetic properties.
  • To investigate the relationship between interface characteristics (size, energy contributions) and biological function.

Main Methods:

  • Analysis of a non-redundant dataset of 2950 protein-dimer complexes determined by X-ray crystallography.
  • Characterization of interfaces using van der Waals (vdW), hydrogen bonding, and electrostatic energies.
  • Classification of interfaces into dominant (≥60% vdW) and sub-dominant (<60% vdW) energy groups.

Main Results:

  • The majority (92%) of interfaces exhibit dominant vdW energy, characterized by large interface size and area.
  • A smaller proportion (8%) of interfaces show sub-dominant vdW energy, with smaller interface size and area, but are enriched in electrostatic energy.
  • Small interfaces, particularly those rich in electrostatics, are frequently associated with regulatory functions.

Conclusions:

  • Protein-protein interfaces can be broadly classified based on their dominant energy contributions (vdW vs. electrostatics).
  • The distinct structural and energetic features of small, electrostatically driven interfaces suggest specialized roles, potentially in cellular regulation.
  • This classification provides insights into PPI mechanisms and their functional implications.