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Bacterially expressed human Fc gamma RIIb is soluble and functionally active after in vitro refolding.

I Kurucz1, A Hilbert, A Kapus

  • 1Department of Cellular and Molecular Biology of Biorex R&D Co., Veszprem, Hungary. istvan_kurucz@rex.biorex.hu

Immunology Letters
|February 13, 2001
PubMed
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A novel method successfully refolded a recombinant soluble human Fc gamma RIIb receptor. This engineered protein mimicked native receptor functions, proving its utility in research despite lacking glycosylation.

Area of Science:

  • Immunology
  • Protein Biochemistry

Background:

  • Fc gamma receptors (FcγRs) play a crucial role in the immune system.
  • Soluble forms of FcγRs are valuable tools for studying immune responses.
  • Production of functional soluble FcγRs presents challenges in protein refolding.

Purpose of the Study:

  • To produce a recombinant soluble form of the human Fc gamma RIIb receptor.
  • To develop and validate a novel in vitro refolding method for this receptor.
  • To characterize the functional and binding properties of the refolded protein.

Main Methods:

  • Engineered a cDNA construct for the extracellular domain of Fc gamma RIIb.
  • Expressed the protein in bacteria, purified inclusion bodies, and refolded using a novel method.
  • Utilized an artificial chaperone during refolding to prevent misfolding and incorrect disulfide bond oxidation.

Related Experiment Videos

  • Assessed receptor function through antibody recognition, ligand binding, and competition assays.

    • Main Results:

    • Successfully produced and refolded a soluble recombinant Fc gamma RIIb.
    • The refolded receptor demonstrated recognition by specific monoclonal antibodies.
    • Bound effectively to its Fc region ligand under various conditions.
    • Showed specific competition with the native cell-surface receptor for ligand and antibody binding.
    • Monoclonal antibodies against the recombinant protein recognized native Fc gamma RIIb on cells.

    Conclusions:

    • The recombinant soluble Fc gamma RIIb is in a native, functionally active form.
    • The developed refolding method is effective for producing active Fc gamma RIIb.
    • Glycosylation is not essential for the studied functions of Fc gamma RIIb.