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Related Experiment Videos

Interferon-gamma induces receptor dimerization in solution and on cells

A C Greenlund1, R D Schreiber, D V Goeddel

  • 1Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110.

The Journal of Biological Chemistry
|August 25, 1993
PubMed
Summary

Interferon-gamma (IFN gamma) binding to its receptor causes receptor dimerization. This IFN gamma receptor dimerization is crucial for initiating biologic responses to IFN gamma.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Interferon-gamma (IFN gamma) is a key cytokine in immune responses.
  • The mechanism of IFN gamma signaling involves its interaction with the IFN gamma receptor.
  • Understanding ligand-receptor interactions is vital for deciphering cellular signaling pathways.

Purpose of the Study:

  • To investigate the molecular mechanism of IFN gamma binding to its receptor.
  • To determine the stoichiometry and nature of the ligand-receptor complex.
  • To elucidate the role of receptor dimerization in IFN gamma-mediated cellular responses.

Main Methods:

  • Expression and purification of the extracellular domain (ECD) of the human IFN gamma receptor.
  • Scatchard analysis to determine binding affinity (Ka).

Related Experiment Videos

  • Sucrose density gradient ultracentrifugation and high-performance liquid chromatography (HPLC) gel filtration to analyze complex formation and stoichiometry.
  • Chemical cross-linking, SDS-PAGE, and immunoblotting to detect cell surface receptor dimerization.

    • Main Results:

    • The purified ECD of the IFN gamma receptor formed a ligand-receptor complex with a high affinity (Ka = 6.4 x 10^8 M-1).
    • HPLC analysis revealed a major complex with a stoichiometry of 2 moles of ECD per 1 mole of IFN gamma.
    • IFN gamma induced dimerization of cell surface IFN gamma receptors, confirmed by cross-linking studies.
    • Labeled ECD bound to cells with excess IFN gamma, indicating ligand-induced receptor association.

    Conclusions:

    • IFN gamma binding induces dimerization of its receptor under physiological conditions.
    • Receptor dimerization is a critical event for initiating IFN gamma-dependent biological responses.
    • These findings provide insights into the molecular basis of IFN gamma signaling.