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Product Details
Synonym
Spike, S protein RBD, Spike glycoprotein Receptor-binding domain, S glycoprotein RBD, Spike protein RBD
Source
SARS-CoV-2 S protein RBD, Fc Tag (SPD-C5255) is expressed from human 293 cells (HEK293). It contains AA Arg 319 - Phe 541 (Accession # QHD43416.1).
Predicted N-terminus: Arg 319
Request for sequenceMolecular Characterization
Other Tags and Version Biotin & Other Labeled Version
This protein carries a human IgG1 Fc tag at the C-terminus.
The protein has a calculated MW of 51.5 kDa. The protein migrates as 60-65 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
Endotoxin
Less than 1.0 EU per μg by the LAL method / rFC method.
Purity
>95% as determined by SDS-PAGE.
>90% as determined by SEC-MALS.
Formulation
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.
Contact us for customized product form or formulation.
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.
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Performance Data
SDS-PAGE
SARS-CoV-2 S protein RBD, Fc Tag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 95%.
SEC-MALS
The purity of SARS-CoV-2 S protein RBD, Fc Tag (Cat. No. SPD-C5255) is more than 90% and the molecular weight of this protein is around 110-125 kDa verified by SEC-MALS.
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Bioactivity-ELISA
Immobilized Human ACE2, His Tag (Cat. No. AC2-H52H8) at 2 μg/mL (100 μL/well) can bind SARS-CoV-2 S protein RBD, Fc Tag (Cat. No. SPD-C5255) with a linear range of 0.2-5 ng/mL (QC tested).
Protocol
Immobilized SARS-CoV-2 S protein RBD, Fc Tag (Cat. No. SPD-C5255) at 2 μg/mL (100 μL/well) can bind Anti-SARS-CoV-2 Neutralizing Antibody, Human IgG1 (Cat. No. SAD-S35) with a linear range of 0.4-3 ng/mL (Routinely tested).
Protocol
Bioactivity-BLI
Loaded SARS-CoV-2 S protein RBD, Fc Tag (Cat. No. SPD-C5255) on Protein A Biosensor, can bind Human ACE2, His Tag (Cat. No. AC2-H52H8) with an affinity constant of 2.16 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
Protocol
Loaded SARS-CoV-2 S protein RBD, Fc Tag (Cat. No. SPD-C5255) on Protein A Biosensor, can bind Cynomolgus ACE2, His Tag (Cat. No. AC2-C52H7) with an affinity constant of 4.48 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
Protocol
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