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Related Experiment Videos

Recombinant human IgE.

H J Gould, B A Helm, P J Marsh

    International Archives of Allergy and Applied Immunology
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified a specific 76-amino acid region on immunoglobulin E (IgE) that binds to mast cell receptors. This finding is crucial for understanding allergic reactions and developing targeted therapies.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Allergy Research

    Background:

    • The epsilon (ε) chain Fc fragment of human immunoglobulin E (IgE) plays a critical role in allergic responses by binding to high-affinity receptors on mast cells and basophils.
    • Understanding the precise binding site of IgE on these receptors is essential for developing targeted therapies for allergic diseases.

    Purpose of the Study:

    • To clone and express the human epsilon chain Fc fragment in Escherichia coli.
    • To characterize the biological activity of the expressed fragment in mediating histamine release and binding to mast cell receptors.
    • To identify and delineate the specific binding site on IgE responsible for mast cell receptor interaction using site-directed mutagenesis.

    Main Methods:

    • High-level expression of the human epsilon chain Fc fragment in Escherichia coli.

    Related Experiment Videos

  • In vitro and in vivo assays to assess biological activity, including histamine release and passive cutaneous anaphylaxis inhibition in human skin.
  • Site-directed mutagenesis to create deletion mutants of the IgE epsilon chain.
  • Analysis of IgE-receptor binding interactions using engineered deletion mutants.

    • Main Results:

    • Successful cloning and high-level expression of the human epsilon chain Fc fragment in E. coli.
    • Demonstrated biological activity of the expressed fragment in binding to mast cell receptors and mediating histamine release.
    • Identified a 76-amino acid stretch (residues 301-376) within the CH2 and CH3 domains of the epsilon chain as the critical binding site for the mast cell receptor.
    • A peptide corresponding to this identified binding site showed activity in human skin tests comparable to intact myeloma IgE.

    Conclusions:

    • The study successfully localized the IgE binding site for mast cell receptors to a defined 76-amino acid region.
    • This precise identification provides a molecular basis for understanding IgE-mediated allergic responses.
    • The findings pave the way for the rational design of novel therapeutic agents targeting IgE-receptor interactions to treat allergies.