Recombinant Biotinylated Bovine FcRn / FCGRT&B2M Heterodimer Protein, His,Avitag™ 200 µg

Background
FCGRT & B2M heterodimer protein (FcRn complex) consist of two subunits: p51 (equivalent to FCGRT), and p14 (equivalent to beta-2-microglobulin), and forms an MHC class I-like heterodimer. Fc fragment of IgG, receptor, transporter, alpha (FCGRT) binds to the Fc region of monomeric immunoglobulins gamma and mediates the uptake of IgG from milk. FCGRT possible role in transfer of immunoglobulin G from mother to fetus. Beta-2-microglobulin (B2M) is a component of the class I major histocompatibility complex (MHC) and involved in the presentation of peptide antigens to the immune system.

Source
MABSol® Recombinant Biotinylated Bovine FcRn Heterodimer Protein, His,Avitag (FCN-B82W3) is expressed from human HEK293 cells. It contains AA Ala 24 - Pro 298 (FCGRT) & Ile 21 - Leu 118 (B2M) (Accession # Q3T119-1(FCGRT) & P01888-1(B2M)).
Predicted N-terminus: Ala 24 (FCGRT) & Ile 21 (B2M)

Molecular Characterization
Biotinylated Bovine FcRn Heterodimer Protein, His,Avitag, produced by co-expression of FCGRT and B2M, has a calculated MW of 34.5 kDa (FCGRT) and 11.6 kDa (B2M). Subunit FCGRT is fused with a polyhistidine tag at the C-terminus, followed by an Avi tag (Avitag™) and subunit B2M contains no tag. The reducing (R) protein migrates as 35-38 kDa (FCGRT) and 12 kDa (B2M) respectively due to glycosylation.

Biotinylation
Biotinylation of this product is performed using Avitag™ technology. Briefly, the single lysine residue in the Avitag is enzymatically labeled with biotin.

Biotin:Protein Ratio
Passed as determined by the HABA assay / binding ELISA.

Endotoxin
Less than 1.0 EU per μg by the LAL method.

Purity
>90% as determined by SDS-PAGE.
>90% as determined by SEC-MALS.

Formulation
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.

Reconstitution
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.

Storage
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
-20°C to -70°C for 12 months in lyophilized state;
-70^°C for 3 months under sterile conditions after reconstitution.

Bioactivity
Please refer to product data sheet.

Clinical and Translational Updates

(1) "Human FcRn Is a Two-in-One Attachment-Uncoating Receptor for Echovirus 18"
Chen, Qu, Liu et al
mBio (2022)
(2) "Detection of nucleotide variants in FCGRT (Fc fragment of IgG, receptor, transporter, alpha) gene and their influence on colostral IgG concentration in Indian water buffalo (Bubalus bubalis)"
Agrawal, Kumar, Chaudhary et al
Mol Biol Rep (2022) 49 (5), 3773-3781
(3) "Polymorphisms of neonatal Fc receptor in cynomolgus and rhesus macaques"
Uno, Utoh, Iwasaki
Drug Metab Pharmacokinet (2014) 29 (5), 427-30
Showing 1-3 of 4 papers.