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Related Experiment Videos

Domain insertions in protein structures.

R Aroul-Selvam1, Tim Hubbard, Rajkumar Sasidharan

  • 1The Wellcome Trust Sanger Institute, Genome Campus, Hinxton, Cambridge CB10 1SA, UK.

Journal of Molecular Biology
|April 22, 2004
PubMed
Summary
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Domain insertions, where one protein domain is embedded within another, occur in 9% of protein combinations. These insertions, often found in loop regions, impact protein structure, function, and evolution, offering insights for protein engineering.

Area of Science:

  • Structural biology
  • Protein science
  • Bioinformatics

Background:

  • Proteins are composed of structural, functional, or evolutionary units called domains.
  • Multi-domain proteins typically arrange domains linearly, but domain insertions present an alternative architecture.
  • Understanding domain insertion patterns is crucial for deciphering protein evolution and engineering.

Purpose of the Study:

  • To quantitatively describe known domain insertions in the Protein Data Bank (PDB).
  • To analyze the characteristics and prevalence of domain insertions in protein structures.
  • To explore the implications of domain insertions for protein structure, function, and evolution.

Main Methods:

  • Analysis of domain combinations within a non-redundant Protein Data Bank (PDB) dataset.

Related Experiment Videos

  • Identification and characterization of domain insertion events.
  • Quantitative assessment of insertion frequency, multiplicity, and positional bias.

    • Main Results:

    • Domain insertions constitute 9% of observed domain combinations in the PDB.
    • While most insertions involve a single domain, multiple and nested insertions also occur.
    • Insertions exhibit a bias towards the C-terminus of parent domains and are located in loop regions, with shorter N-to-C terminus distances compared to single domains.

    Conclusions:

    • Domain insertions represent a significant deviation from the typical linear arrangement of protein domains.
    • The structural and functional properties of domains influence their propensity to act as parents or inserts.
    • These findings have implications for understanding protein evolution and advancing protein engineering strategies.