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2017 ; 16
(3
): 451-456
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A Two-pronged Binding Mechanism of IgG to the Neonatal Fc Receptor Controls
Complex Stability and IgG Serum Half-life
#MMPMID28062799
Jensen PF
; Schoch A
; Larraillet V
; Hilger M
; Schlothauer T
; Emrich T
; Rand KD
Mol Cell Proteomics
2017[Mar]; 16
(3
): 451-456
PMID28062799
show ga
The success of recombinant monoclonal immunoglobulins (IgG) is rooted in their
ability to target distinct antigens with high affinity combined with an
extraordinarily long serum half-life, typically around 3 weeks. The
pharmacokinetics of IgGs is intimately linked to the recycling mechanism of the
neonatal Fc receptor (FcRn). For long serum half-life of therapeutic IgGs, the
highly pH-dependent interaction with FcRn needs to be balanced to allow efficient
FcRn binding and release at slightly acidic pH and physiological pH,
respectively. Some IgGs, like the antibody briakinumab has an unusually short
half-life of ?8 days. Here we dissect the molecular origins of excessive FcRn
binding in therapeutic IgGs using a combination of hydrogen/deuterium exchange
mass spectrometry and FcRn affinity chromatography. We provide experimental
evidence for a two-pronged IgG-FcRn binding mechanism involving direct FcRn
interactions with both the Fc region and the Fab regions of briakinumab, and
correlate the occurrence of excessive FcRn binding to an unusually strong
Fab-FcRn interaction.