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Why are multiple chains required for the interleukin 2 receptor?

Y Saito1, T Honjo

  • 1Department of Medical Chemistry, Kyoto University Faculty of Medicine, Japan.

Progress in Growth Factor Research
|January 1, 1990
PubMed
Summary
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Interleukin 2 receptor (IL-2R) binding kinetics reveal the L chain (alpha) initiates IL-2 association, forming a high-affinity complex. This stepwise model explains IL-2R signal transduction, involving the H chain (beta) and kinase activity.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • The interleukin 2 receptor (IL-2R) mediates immune responses.
  • IL-2R comprises L chain (p55, alpha) and H chain (p75, beta).
  • High-affinity IL-2 binding forms a ternary complex.

Purpose of the Study:

  • To elucidate the mechanism of IL-2 binding to the high-affinity IL-2R.
  • To investigate the role of IL-2R subunits in IL-2 binding and signal transduction.
  • To support the stepwise binding/affinity conversion model.

Main Methods:

  • Kinetic studies of IL-2 binding to IL-2R.
  • Experiments using monoclonal antibodies against IL-2R chains.
  • Transfection of murine T cell lines with human L chain cDNA.

Related Experiment Videos

  • Analysis of temperature-sensitive IL-2 binding.

    • Main Results:

    • IL-2 association with the L chain is the initial step in ternary complex formation.
    • Increased L chain expression accelerates IL-2 binding.
    • Antibody and transfection studies support the stepwise binding model.
    • IL-2R signal transduction involves tyrosine protein kinase activation.

    Conclusions:

    • The L chain is crucial for the initial IL-2 binding to the high-affinity IL-2R.
    • IL-2R signaling requires the H chain and an associated kinase.
    • The findings support a stepwise model for IL-2 receptor complex formation and activation.