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IgG4 breaking the rules.

Rob C Aalberse1, Janine Schuurman

  • 1Department of Immunopathology, CLB, Amsterdam, The Netherlands. aalberse@clb.nl

Immunology
|February 19, 2002
PubMed
Summary

Immunoglobulin G4 (IgG4) antibodies are functionally monovalent due to half-molecule exchange, creating bispecific antibodies. This structural feature prevents large immune complex formation, reducing inflammation and maintaining a normal antibody half-life.

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Area of Science:

  • Immunology
  • Structural Biology
  • Protein Chemistry

Background:

  • Immunoglobulin G4 (IgG4) antibodies exhibit functional monovalency.
  • The structural basis for this phenomenon involves in vivo exchange of IgG half-molecules.

Purpose of the Study:

  • To elucidate the structural basis of IgG4's functional monovalency.
  • To understand the role of specific amino acid changes and in vivo catalysis in IgG4 behavior.

Main Methods:

  • Structural analysis of IgG4 and comparison with IgG1.
  • Postulation of in vivo catalytic roles for protein disulphide isomerase (PDI) and FcRn.

Main Results:

  • A single proline-to-serine change in the IgG4 hinge region alters interchain disulfide bridge equilibrium.
  • This leads to 25-75% absence of covalent H-chain interaction, enabling half-molecule exchange.
  • IgG4 remains a stable molecule due to non-covalent interactions, with exchange facilitated in vivo.

Conclusions:

  • IgG4's half-molecule exchange generates bispecific antibodies that limit immune complex formation and inflammation.
  • This mechanism provides a low-inflammation immune response with a normal antibody half-life.
  • The biological significance of IgG4 bispecificity and autoreactivity warrants further investigation.

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