My Review for Mouse Anti-Rat FcRn heavy chain heterodimers Monoclonal antibody, clone 2G3
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References
Investigation of the interaction between the class I MHC-related Fc receptor and its immunoglobulin G ligand
Investigation of the interaction between the class I MHC-related Fc receptor and its immunoglobulin G ligand" Immunity 1(4): 303-315.
The neonatal Fc receptor (FcRn) is structurally similar to class I major histocompatibility molecules. FcRn transports maternal immunoglobulin G (IgG) from ingested milk into the blood. IgG is bound at the pH of milk (pH 6.0-6.5) in the gut and released at the pH of blood (pH 7.5). We find that alteration of a histidine pair within the alpha 3 domain of FcRn and of a nearby loop (the FcRn counterpart of the class I CD8-binding loop) affects the affinity for IgG. Inhibition studies suggest the involvement of the FcRn B2-microglobulin domain in IgG binding. Fragment B of protein A inhibits FcRn binding to IgG, localizing the binding site on Fc for FcRn to the CH2-CH3 domain interface. Three histidines present at the CH2-CH3 domain interface of Fc could be partially responsible for the pH-dependent interaction between FcRn and IgG.
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