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IgG4 on the dance floor: Partners swapped by Fab-arm exchange
Ailis Grieshaber1, Kevin C O'Connor1
1Departments of Neurology and Immunobiology, Yale University School of Medicine, New Haven, CT, USA.
Nearly all human IgG4 antibodies undergo Fab-arm exchange, generating a wide range of bispecific antibodies. This proteomic finding reveals a significant mechanism for antibody diversity in circulation.
Area of Science:
- Immunology
- Proteomics
- Biochemistry
Background:
- Immunoglobulin G4 (IgG4) is a subclass of antibodies with unique structural properties.
- Antibody engineering aims to create novel therapeutic proteins with enhanced functionalities.
Purpose of the Study:
- To investigate the in vivo behavior of circulating human IgG4 antibodies.
- To determine the extent of Fab-arm exchange in native IgG4 antibodies.
Main Methods:
- Quantitative proteomic analysis of human serum.
- Mass spectrometry-based techniques to identify and quantify antibody fragments.
Main Results:
- Proteomic analysis revealed that virtually all circulating human IgG4 antibodies undergo Fab-arm exchange.
- This process results in the formation of heterodimeric IgG molecules, effectively creating a bispecific antibody repertoire.
Conclusions:
- Fab-arm exchange is a predominant mechanism for IgG4 in vivo.
- This inherent process generates a diverse pool of bispecific antibodies from a single antibody class, with implications for immune responses and therapeutic antibody design.
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