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Mapping the site on human IgG for binding of the MHC class I‐related receptor, FcRn

Mapping the site on human IgG for binding of the MHC class I‐related receptor, FcRn The analysis of the pharmacokinetics of wild‐type and mutated Fc fragments derived from human IgG1 indicates that Ile253, His310 and His435 play a central role in regulating serum half‐life in mice. Reduced serum half‐life of the recombinant, mutated fragments correlates with decreased binding to the MHC class I‐related neonatal Fc receptor, FcRn. In addition, the analysis of an Fc fragment in which His435 is mutated to Arg435 demonstrates that the sequence difference at this position between human IgG1 (His435) and IgG3 (Arg435) most likely accounts for the shorter serum half‐life of IgG3 relative to IgG1. In contrast to His310 and His435, the data indicate that His433 does not play a role in regulating the serum half‐life of human IgG1. Thus, the interaction site of mouse FcRn on human and mouse IgG1 involves the same conserved amino acids located at the CH2‐CH3 domain interface of the IgG molecule. The sequence similarities between mouse and human FcRn suggest that these studies have direct relevance to understanding the factors that govern the pharmacokinetics of therapeutic IgG. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png European Journal of Immunology Wiley

Mapping the site on human IgG for binding of the MHC class I‐related receptor, FcRn

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References (35)

Publisher
Wiley
Copyright
© 1999 WILEY‐VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany
ISSN
0014-2980
eISSN
1521-4141
DOI
10.1002/(SICI)1521-4141(199909)29:09<2819::AID-IMMU2819>3.0.CO;2-6
pmid
10508256
Publisher site
See Article on Publisher Site

Abstract

The analysis of the pharmacokinetics of wild‐type and mutated Fc fragments derived from human IgG1 indicates that Ile253, His310 and His435 play a central role in regulating serum half‐life in mice. Reduced serum half‐life of the recombinant, mutated fragments correlates with decreased binding to the MHC class I‐related neonatal Fc receptor, FcRn. In addition, the analysis of an Fc fragment in which His435 is mutated to Arg435 demonstrates that the sequence difference at this position between human IgG1 (His435) and IgG3 (Arg435) most likely accounts for the shorter serum half‐life of IgG3 relative to IgG1. In contrast to His310 and His435, the data indicate that His433 does not play a role in regulating the serum half‐life of human IgG1. Thus, the interaction site of mouse FcRn on human and mouse IgG1 involves the same conserved amino acids located at the CH2‐CH3 domain interface of the IgG molecule. The sequence similarities between mouse and human FcRn suggest that these studies have direct relevance to understanding the factors that govern the pharmacokinetics of therapeutic IgG.

Journal

European Journal of ImmunologyWiley

Published: Sep 1, 1999

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