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Characterization of Glycoproteins with the Immunoglobulin Fold by X-Ray Crystallography and Biophysical Techniques
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Bifunctional CD22 ligands use multimeric immunoglobulins as protein scaffolds in assembly of immune complexes on B

Mary K O'Reilly1, Brian E Collins, Shoufa Han

  • 1Department of Chemical Physiology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, USA.

Journal of the American Chemical Society
|May 29, 2008
PubMed

Insights

Researchers developed a synthetic molecule to target CD22 (a B cell regulator) using antibody scaffolds. This method efficiently assembles complexes on B cells, showing potential for targeting B cell malignancies.

Area of Science:

  • Immunology
  • Biochemistry
  • Cell Biology

Background:

  • CD22 is a B cell-specific lectin regulating B cell signaling.
  • Its function is modulated by specific sialic acid-containing glycan ligands (NeuAc α2-6Gal).
  • Previously, only highly multivalent ligands (n=450) could bind CD22 on native B cells.

Purpose of the Study:

  • To develop a synthetic molecule for efficient CD22 complex assembly on B cells.
  • To investigate the role of antibody valency and ligand structure in CD22 binding.
  • To explore the potential for targeted B cell therapy.

Main Methods:

  • Synthesized bifunctional molecules linking CD22 ligands to nitrophenol (NP) antigens.
  • Utilized monoclonal anti-NP IgM (decavalent), IgA (tetravalent), and IgG (divalent) as protein scaffolds.
  • Analyzed complex formation on native B cells using varying linker lengths and structures.

Main Results:

  • A synthetic CD22 ligand linked to NP efficiently drove IgM-CD22 complex assembly on B cells.
  • Lower valency antibodies (IgA, IgG) also induced complex formation, albeit with reduced avidity.
  • Ligand structure and linker length influenced complex assembly, with a minimal length requirement identified.
  • Complex assembly was exclusive to CD22-expressing B cells, not other leukocytes.

Conclusions:

  • Bifunctional molecules can leverage antibody scaffolds for targeted CD22 engagement on B cells.
  • This approach offers a versatile strategy for modulating B cell surface interactions.
  • The B cell-specific targeting capability holds promise for treating B cell malignancies.

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