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Related Experiment Videos

Mapping rheumatoid factor binding sites using genetically engineered, chimeric IgG antibodies.

V R Bonagura1, S E Artandi, N Agostino

  • 1Department of Microbiology, College of Physicians and Surgeons, Columbia University, New York, NY 10032.

DNA and Cell Biology
|April 1, 1992
PubMed
Summary
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Rheumatoid factors (RFs) from rheumatoid arthritis and Waldenstrom's macroglobulinemia patients exhibit distinct IgG binding patterns. Specific IgG domains, particularly CH3 and CH2, and the His-435 residue, dictate these differences.

Area of Science:

  • Immunology
  • Structural Biology
  • Rheumatology

Background:

  • Rheumatoid factors (RFs) are autoantibodies targeting IgG, implicated in autoimmune diseases like rheumatoid arthritis (RA) and Waldenstrom's macroglobulinemia (WMac).
  • Understanding RF binding specificities to different IgG subclasses is crucial for elucidating disease pathogenesis and developing targeted therapies.

Purpose of the Study:

  • To map the binding sites of IgM RFs on human IgG subclasses.
  • To investigate the structural basis for differential RF binding specificities between RA and WMac patients.

Main Methods:

  • Utilized chimeric IgG antibodies with murine variable and human constant regions.
  • Employed a modified RF ELISA assay to assess RF binding to various IgG subclasses and engineered mutants.

Related Experiment Videos

  • Performed site-directed mutagenesis and domain shuffling of IgG constant regions.

    • Main Results:

    • RFs from RA and WMac patients displayed distinct binding specificities for IgG subclasses, with some overlap for IgG1, IgG2, and IgG4.
    • The CH3 domain of IgG was identified as critical for differentiating WMac RF binding to IgG3 and IgG4.
    • His-435 residue in IgG was essential for WMac RF binding, while CH2 domain loops influenced binding to IgG4.
    • Aglycosylated IgG3 showed enhanced RF binding compared to its glycosylated form.

    Conclusions:

    • IgG subclass specificity of RFs is determined by variations in constant region domains, particularly CH3 and CH2.
    • Specific amino acid residues, such as His-435, and structural features like CH2 loops are key determinants of RF binding.
    • Glycosylation status, especially for IgG3, can significantly impact RF recognition.