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Updated: Aug 8, 2026

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes
10:00

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

Published on: March 24, 2015

Mapping human interferon-alpha (IFN-alpha 2) binding determinants of the type I interferon receptor subunit IFNAR-1

L A Goldman1, E C Cutrone, A Dang

  • 1Department of Molecular Genetics and Microbiology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA.

Biochemistry
|September 16, 1998
PubMed

Insights

Bovine IFNAR-1 binds human interferons with higher affinity than human IFNAR-1. Researchers created chimeric receptors to identify key binding regions, finding that bovine subdomains 2 and 3 are crucial for this enhanced binding.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Type I interferons (IFNs) mediate crucial immune responses by binding to the interferon alpha/beta receptor (IFNAR).
  • The human IFNAR-1 subunit exhibits weak affinity for Type I IFNs, limiting detailed binding studies.
  • Bovine IFNAR-1 (BoIFNAR-1) displays moderate affinity for human Type I IFNs, offering a valuable model for investigating ligand-receptor interactions.

Purpose of the Study:

  • To identify specific subdomains within bovine IFNAR-1 responsible for its enhanced binding affinity to human Type I interferons.
  • To elucidate the structural determinants governing the interaction between IFNAR-1 and Type I IFNs.

Main Methods:

  • Construction and expression of 14 bovine/human IFNAR-1 chimeric receptors in COS cells.
  • Quantitative assessment of chimeric receptor binding to human interferon alpha-2 (HuIFN-alpha2).

Main Results:

  • No single substituted bovine subdomain conferred moderate-affinity binding to human IFNAR-1.
  • Simultaneous replacement of bovine subdomains 2 and 3 into human IFNAR-1 significantly increased HuIFN-alpha2 binding.
  • Bovine subdomains 1 and/or 4 further enhanced binding when combined with bovine subdomains 2 and 3.

Conclusions:

  • The moderate-affinity binding of human Type I IFNs by bovine IFNAR-1 is primarily determined by subdomains 2 and 3.
  • IFNAR-1 exhibits a complex binding interaction with IFNs, potentially more intricate than other class II cytokine receptors.
  • These findings provide insights into the structural basis of interferon receptor recognition and signaling.

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