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Human type I interferons: structure and function

P Kontsek1

  • 1Institute of Virology, Slovak Academy of Sciences, Bratislava.

Acta Virologica
|December 1, 1995
PubMed
Summary
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Human type I interferons (IFNs) share structural similarities but exhibit distinct biological effects. Specific amino acid regions dictate receptor binding and functional individuality, leading to varied antiviral, antiproliferative, and immunomodulating actions.

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Human type I interferons (IFNs) encompass 13 IFN-alpha subtypes, IFN-beta, and IFN-omega.
  • These IFNs share 20% sequence homology, resulting in conserved secondary and tertiary structures, including a 5 alpha-helical bundle forming two polypeptide domains.
  • A disulfide bond (Cys 29-Cys 139) is crucial for maintaining the bioactive conformation of type I IFNs.

Purpose of the Study:

  • To elucidate the structural basis for the conserved receptor binding and functional specificity of human type I IFNs.
  • To identify key amino acid regions responsible for differential biological activities among IFN subtypes.
  • To understand the complex interaction between type I IFNs and their common cellular receptor.

Main Methods:

Related Experiment Videos

  • Analysis of sequence homology and three-dimensional structural models of type I IFNs.
  • Identification of conserved and variable hydrophilic regions within IFN polypeptide chains.
  • Correlation of structural features with known biological activities (antiviral, antiproliferative, immunomodulating).

    • Main Results:

    • Type I IFNs share a common receptor, implying conserved receptor-binding areas, particularly hydrophilic regions at amino acids (aa) 30-41 and 120-145.
    • Despite structural similarities, individual IFN subtypes induce distinct biological effects due to variations in receptor-binding sites.
    • Variable hydrophilic regions (aa 23-26, 68-85, 112-121) alongside subtle sequence heterogeneity in conserved regions contribute to functional individuality.
    • Glycosylation of IFN-beta, IFN-omega, and some IFN-alpha subtypes is structurally and functionally irrelevant.

    Conclusions:

    • The structural conservation of type I IFNs facilitates common receptor recognition, while specific amino acid variations confer distinct biological functions.
    • The interaction with the cellular receptor is a complex event triggering multiple cellular responses.
    • Understanding these structural-functional relationships is key to differentiating the therapeutic potential of various type I IFN subtypes.