Fc Receptor Proteins

High purity

To meet the high purity requirement of pharmaceutical applications, our production team perform both SDS-PAGE and SEC-MALS analyses to the Fc receptors for QC purposes. It’s noteworthy that it’s essential to use monomeric Fc receptor, which represents its natural state. The formation of oligomers during production may result in artificially enhanced binding interaction due to avidity effect. To avoid such situation, we have established strict internal control standards of monomer purity by SEC-MALS testing. Only those batches meeting all purity requirements are released.

                                                   Fig. 1 The purity of Human CD32a (R167), His Tag (Cat. No. CDA-H5221) is more than 95% verified by SDS-PAGE. The purity of Human CD32a (R167), His Tag (Cat. No. CDA-H5221) is more than 90% verified by SEC-MALS. And the molecular weight of this protein is around 25-35 kDa.

Bioactivity validated by SPR&BLI

The binding affinity between two molecules can be determined by many methods. However, the studies of Fc interaction are often done by SPR, because traditional ELISA is not appropriate for low affinity receptors such as CD16 and CD32. To assure our Fc receptors deliver expected performance, our QC team use Biacore platform to test our products against reference antibodies. Additionally, to meet more applications in the development of antibody drugs, our QC team also use ForteBio platform to test our products against reference antibodies. All SPR&BLI protocols are available for free.

Fig. 2 Human CD64, His Tag (SPR & BLI verified) (Cat. No. FCA-H52H1) captured on CM5 chip via anti-His antibody can bind Herc*ptin with an affinity constant of 4.92 nM as determined in a SPR assay (Biacore 8K) (QC tested).

Request SPR Protocol

Inquire SPR Service

Fig. 3 Immobilized Human FCGRT&B2M Heterodimer Protein, His Tag&Strep II Tag (SPR & BLI verified) (Cat. No.  FCM-H5286) on CM5 Chip via Anti-His antibody, can bind Herc*ptin with an affinity constant of 0.261 μM as determined in a SPR assay (Biacore T200).

Request SPR Protocol

Inquire SPR Service

Fig. 4 Loaded Human CD64, His Tag (SPR & BLI verified) (Cat. No. FCA-H52H1) on HIS1K Biosensor, can bind Herc*ptin with an affinity constant of 6.98 nM as determined in BLI assay (ForteBio Octet Red96e).

Request BLI Protocol

Inquire BLI Service

Fig. 5 Loaded Human FCGRT&B2M Heterodimer Protein, His Tag (SPR & BLI verified) (Cat. No. FCN-H52W7) on SA Biosensor via Biotin his antibody, can bind Herc*ptin with an affinity constant of 0.14 μM as determined in BLI assay (ForteBio Octet Red96e).

Request BLI Protocol

Inquire BLI Service

High Batch-to-batch Consistency

We routinely apply rigorous quality control measures to ensure consistent performance of our product. As shown below, the batch variation among the tested samples is negligible.

Fig. 6 Immobilized Human Fc gamma RIIB / CD32b Protein (Cat. No. CDB-H5228) on CM5 Chip via anti-His antibody, can bind Ritux*mab with an affinity constant of 10 μM as determined in a SPR assay (Biacore T200).

Request SPR Protocol

Inquire SPR Service