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. 2022 Apr 4;102(4):1625–1667. doi: 10.1152/physrev.00014.2021

Table 4.

Assessment of rFcRn binding to albumins and lgGs

Ligand rFcRn pH 6 Kd, µM hFcRn pH 6 Kd, µM mFcRn pH 6 Kd, µM
Albumins
Rat 11.6 ∼1.1 SB
Rabbit 11.8
Human >100 4.6–5.2 ∼86
Human WB 1.1 WB
Porcine >100 >50
Mouse >100 0.8 9.3–SB
Bovine >100
Sheeo >100
Rhesus WB
IgGs
Rat 1.8 ∼0.45
Rat lqG2a 0.014 NB
Rabbit 0.19 SB SB
Human 0.63 0.70 0.265
0.03 0.09
Human 0.05 2.35 1.2
Human laG1 0.63 0.082
Bovine 1.5 WB SB
Mouse >100 WB ∼0.01
Mouse lqG1 >50 0.75
Mouse lqG2a 0.019 NB 0.025
Rat and Mouse
lqGs ∼0.05

FcRn, neonatal Fc receptor; hFcRn, human FcRn; Kd, dissociation coefficient; mFcRn, mouse FcRn; NB, no binding; rFcRn, rat FcRn; SB, strong binding; WB, weak binding.