The conserved histidine 166 residue of the human neonatal Fc receptor heavy chain is critical for the pH-dependent binding to albumin.


The MHC class I-related neonatal Fc receptor (FcRn) serves in the homeostatic regulation of IgG and albumin by increasing their half-lives. FcRn may bind IgG and albumin simultaneously, and in a pH-dependent manner, with ligand binding at pH 6.0-6.5 and release at pH 7.0-7.4. The FcRn-IgG interaction has been extensively characterized at the amino acid… (More)


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