FcRn,FCGRT & B2M
Rat FCGRT&B2M Heterodimer Protein, His Tag&Strep II Tag (SPR verified) (FCM-R5287) is expressed from human 293 cells (HEK293). It contains AA Ala 23 - Ser 298 (FCGRT) & Ile 21 - Met 119 (B2M) (Accession # P13599-1 (FCGRT) & P07151-1 (B2M)).
Predicted N-terminus: Ala 23 (FCGRT) & Ile 21 (B2M)
Rat FCGRT&B2M Heterodimer Protein, His Tag&Strep II Tag (SPR verified), produced by co-expression of FCGRT and B2M, has a calculated MW of 31.8 kDa (FCGRT) and 13.1 kDa (B2M). Subunit FCGRT is fused with a polyhistidine tag at the C-terminus and subunit Beta-2 microglobulin (B2M) is fused with Strep II-tag at the C-terminus. The reducing (R) protein migrates as 43-55 kDa (FCGRT) and 14 kDa (B2M) respectively due to different glycosylation.
Less than 1.0 EU per μg by the LAL method.
>95% as determined by SDS-PAGE.
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.
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Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
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.
Rat FCGRT&B2M Heterodimer Protein, His Tag&Strep II Tag (SPR verified) on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.
Rat FCGRT&B2M Heterodimer Protein, His Tag&Strep II Tag (SPR verified) (Cat. No. FCM-R5287) captured on NTA-Series S sensor chip can bind Herceptin® with an affinity constant of 19.9 nM as determined in a SPR assay (Biacore T200) (QC tested).
Authors: Kenniston JA, et al.
Journal: J Biol Chem 2017
Application: ELISA & SPR
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.