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Surface, subunit interfaces and interior of oligomeric proteins.

J Janin1, S Miller, C Chothia

  • 1Laboratoire de Biologie Physiochimique, Université Paris-Sud, Orsay, France.

Journal of Molecular Biology
|November 5, 1988
PubMed
Summary

Oligomeric proteins

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Area of Science:

  • Protein structure and biophysics
  • Structural biology
  • Computational biology

Background:

  • Oligomeric proteins are crucial for biological functions.
  • Understanding protein-protein interactions is key to molecular biology.
  • The surface properties of oligomeric proteins influence their assembly and function.

Purpose of the Study:

  • To analyze the solvent-accessible surface area (As) of oligomeric proteins.
  • To correlate As with protein molecular weight and subunit interfaces.
  • To investigate the amino acid composition and H-bonding at subunit interfaces.

Main Methods:

  • Calculation of solvent-accessible surface area (As) using atomic coordinates.
  • Analysis of protein molecular weight correlations.
  • Characterization of amino acid distribution and hydrogen bonds at subunit interfaces.

Main Results:

  • A power law accurately predicts As for oligomeric proteins based on molecular weight.
  • Protein surface properties (hydropathy, amino acid composition) are similar to monomers.
  • Interfaces are enriched in hydrophobic residues but also contain charged groups, particularly Arg, involved in H-bonds.

Conclusions:

  • Oligomeric protein assembly can be inferred from interface size and subunit properties.
  • Small interfaces suggest assembly from pre-formed monomers with minimal conformational changes.
  • Large interfaces indicate potential instability of isolated subunits and significant structural rearrangements upon assembly.

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