FcRn（Neonatal Fc Receptor）

The purity of Canine FCGRT&B2M Heterodimer Protein, His Tag&Tag Free (Cat. No. FCM-C52W8) is more than 90% and the molecular weight of this protein is around 43-60 kDa verified by SEC-MALS.

Human FcRn–Herceptin binding affinity (SPR validated)

Immobilized Biotinylated Human FCGRT&B2M Heterodimer Protein, His,Avitag (Cat. No. FCM-H82W7) on SA Chip can bind Herceptin® with an affinity constant of 0.267 μM as determined in a SPR assay (Biacore 8K) (QC tested).

Mouse FcRn–Herceptin binding affinity (SPR validated)

Mouse FCGRT&B2M Heterodimer Protein, His Tag (Cat. No. FCM-M52W8) captured on NTA-Series S sensor chip can bind Herceptin with an affinity constant of 2.52 nM as determined in a SPR assay (Biacore T200) (Routinely tested).

FcRn–Herceptin binding affinity (BLI validated)

Loaded Cynomolgus / Rhesus macaque FCGRT&B2M Heterodimer Protein, His Tag&Strep II Tag (Cat. No. FCM-C5284 ) on SA Biosensor via Biotin his antibody, can bind Herceptin with an affinity constant of 0.13 μM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).

FCGRT&B2M–Serum Albumin binding affinity (BLI validated)

Loaded Biotinylated Human FCGRT&B2M Heterodimer Protein, His,Avitag (Cat. No. FCM-H82W7) on SA Biosensor, can bind Human Serum Albumin, His Tag (Cat. No. HSA-H5220) with an affinity constant of 0.647 μM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).

The half-lives of these 3 monoclonal antibodies currently in clinical use generally correlate with the binding affinity to FcRn. The kit (Cat.No.FRT-01) has been used to detect 3 FDA approved antibody drugs of different binding affinity to FcRn, and the IC50 trends are consistent with affinity constant from SPR as well as the actual in vivo half-life published.

The kit (Cat.No.FRT-01) is suitable for the detection of FcRn inhibitors. It shows that both Efgartigimod and its biosimilar, Human IgG1 Fc (C103S, M135Y, S137T, T139E, H316K, N317F) His Tag (Cat. No. IG1-H52H8) exhibit good inhibitory activity in this TR-FRET competition assay.

FACS assay shows that FITC-Labeled Human IgG1 Fc (C103S, M135Y, S137T, T139E, H316K, N317F) Protein, His Tag (Cat. No. IG1-HF2H3) can bind to HEK293/Human FcRn (FCGRT & B2M) Stable Cell Line. HEK293/Human FcRn (FCGRT & B2M) Stable Cell Line (Cat. No. CHEK-ATP079) was red line, negative control HEK293 cells was grey line(QC tested).