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Related Experiment Videos

Protein domain interfaces: characterization and comparison with oligomeric protein interfaces.

S Jones1, A Marin, J M Thornton

  • 1Biomolecular Structure and Modelling Unit, Department of Biochemistry and Molecular Biology, University College, Gower Street, London WC1E 6BT, UK. sue@biochem.ucl.ac.uk

Protein Engineering
|March 10, 2000
PubMed
Summary

Protein domain interactions within single molecules share physical and chemical properties with interactions between separate protein molecules. This suggests common principles govern protein assembly and folding.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Science

Background:

  • Protein structures are often composed of multiple domains.
  • Understanding domain-domain interactions is crucial for protein function and folding.

Purpose of the Study:

  • To analyze the physical and chemical properties of intra-chain domain-domain interactions.
  • To compare these properties with inter-chain protein-protein interactions.

Main Methods:

  • Analysis of two-domain protein structures from the CATH database.
  • Calculation of interface properties: size, polarity, hydrogen bonding, and packing.
  • Comparison with interface parameters from protein-protein complexes.

Main Results:

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  • Intra-chain domain interfaces exhibit remarkable similarity to inter-chain interfaces.
  • Interface properties are often intermediate between permanent and non-obligate protein complexes.
  • Hydrophobic and arginine residues are key components of domain interfaces.

    • Conclusions:

    • Domain-domain interactions share common biophysical principles regardless of whether they are intra- or inter-chain.
    • Findings offer insights into protein folding mechanisms and the phenomenon of domain swapping.