Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF

R&D Systems | Catalog # 10500-CV

HEK293 Expressed, High ACE-2 Binding
R&D Systems
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Key Product Details

  • R&D Systems HEK293-derived Recombinant SARS-CoV-2 Spike RBD His-tag Protein (10500-CV)
  • Quality control testing to verify active proteins with lot specific assays by in-house scientists
  • All R&D Systems proteins are covered with a 100% guarantee

Source

HEK293

Accession Number

YP_009724390.1

Applications

Bioactivity
View all Spike RBD Proteins and Enzymes »

Why choose R&D Systems SARS-CoV-2 Spike RBD Protein?

  • Guaranteed Bioactivity and High Purity: Bioactivity tested by functional ELISA and purity determined by SDS-PAGE to be greater than 95%.
  • Lot-to-Lot Consistency: Stringent QC testing performed on each lot to ensure consistent activity and purity.
  • Bulk Quantities Available: Bulk up and save with large mass quantities to meet your research needs. Supply agreements available, partner with us. Please contact us.
  • Most Respected, Most Cited Brand in Proteins: With over 35 years of providing the best recombinant proteins to the scientific community, R&D Systems continues to lead the industry in quality, activity, and purity.

Interested in other Coronavirus proteins including SARS-CoV-2 Spike proteins? View Products

Product Specifications

Source

Human embryonic kidney cell, HEK293-derived sars-cov-2 Spike RBD protein
Arg319-Phe541, with a C-terminal 6-His tag

Purity

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<0.10 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Arg319

Predicted Molecular Mass

26 kDa

SDS-PAGE

28-38 kDa, under reducing conditions

Activity

Measured by its binding ability in a functional ELISA with Recombinant Human ACE-2 His-tag  (Catalog # 933-ZN).

Reviewed Applications

Read 2 reviews rated 5 using 10500-CV in the following applications:

Scientific Data Images for Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF

Graph showing bioactivity of SARS-CoV-2 Spike protein binding to Human ACE-2

Recombinant SARS-CoV-2 Spike RBD His-tag Protein Bioactivity

Recombinant SARS-CoV-2 Spike RBD His-tag Protein (HEK293 Expressed) (10500-CV) binds Recombinant Human ACE-2 His-tag (933-ZN) in a functional ELISA.
Graph showing bioactivity of SARS-CoV-2 Spike protein binding to Human ACE-2

Recombinant SARS-CoV-2 Spike RBD His-tag Protein SDS-PAGE

2 μg/lane of Recombinant SARS-CoV-2 Spike RBD His-tag Protein (HEK293 Expressed) (10500-CV) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 28-38 kDa.
Surface plasmon resonance sensorgram of SARS-CoV-2 Spike protein binding to Human ACE-2

Binding of ACE-2 to SARS-CoV-2 Spike RBD by surface plasmon resonance (SPR).

Recombinant SARS-CoV-2 Spike RBD His-tag Protein (Catalog # 10500-CV) was immobilized on a Biacore Sensor Chip CM5, and binding to recombinant human ACE-2 (Catalog # 933-ZN) was measured at a concentration range between 0.37 nM and 93.5 nM. The double-referenced sensorgram was fit to a 1:1 binding model to determine the binding kinetics and affinity, with an affinity constant of KD=2.149 nM.
Graph showing R&D Systems Spike protein binding to ACE-2 compared to a competitor's Spike protein
R&D Systems Spike RBD protein beats the competition. Recombinant SARS-CoV-2 Spike RBD (10500-CV) binds recombinant human ACE-2 (10544-ZN) in a functional ELISA. The binding activity is approximately 3-fold greater than a top competitor’s Spike RBD protein.
SDS-PAGE gel of R&D Systems purified recombinant SARS-CoV-2 Spike RBD protein compared to another vendor's Spike RBD protein
SDS-PAGE of 1 µg of R&D Systems Recombinant SARS-CoV-2 Spike RBD (10500-CV) or a competitor’s Spike RBD protein were run under reducing or non-reducing conditions and visualized by silver staining. The R&D Systems Spike protein runs as a sharper, more definitive band than the competitor’s Spike RBD protein.

Formulation, Preparation, and Storage

10500-CV
Formulation Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Calculators

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: Spike RBD

SARS-CoV-2, which causes the global pandemic coronavirus disease 2019 (Covid-19), belongs to a family of viruses known as coronaviruses that are commonly comprised of four structural proteins: Spike protein(S), Envelope protein (E), Membrane protein (M), and Nucleocapsid protein (N) (1). SARS-CoV-2 Spike Protein (S Protein) is a glycoprotein that mediates membrane fusion and viral entry. The S protein is homotrimeric, with each ~180-kDa monomer consisting of two subunits, S1 and S2 (2). In SARS-CoV-2, as with most coronaviruses, proteolytic cleavage of the S protein into two distinct peptides, S1 and S2 subunits, is required for activation. The S1 subunit is focused on attachment of the protein to the host receptor while the S2 subunit is involved with cell fusion (3-5). Based on structural biology studies, the receptor binding domain (RBD), located in the C-terminal region of S1, can be oriented either in the up/standing or down/lying state (6). The standing state is associated with higher pathogenicity and both SARS-CoV-1 and MERS can access this state due to the flexibility in their respective RBDs. A similar two-state structure and flexibility is found in the SARS-CoV-2 RBD (7). Based on amino acid (aa) sequence homology, the SARS-CoV-2 S1 subunit RBD has 73% identity with the RBD of the SARS-CoV-1 S1 RBD, but only 22% homology with the MERS S1 RBD. The low aa sequence homology is consistent with the finding that SARS and MERS bind different cellular receptors (8). The S Protein of the SARS-CoV-2 virus, like the SARS-CoV-1 counterpart, binds Angiotensin-Converting Enzyme 2 (ACE2), but with much higher affinity and faster binding kinetics (9). Before binding to the ACE2 receptor, structural analysis of the S1 trimer shows that only one of the three RBD domains in the trimeric structure is in the "up" conformation. This is an unstable and transient state that passes between trimeric subunits but is nevertheless an exposed state to be targeted for neutralizing antibody therapy (10). Polyclonal antibodies to the RBD of the SARS-CoV-2 protein have been shown to inhibit interaction with the ACE2 receptor, confirming RBD as an attractive target for vaccinations or antiviral therapy (11). There is also promising work showing that the RBD may be used to detect presence of neutralizing antibodies present in a patient's bloodstream, consistent with developed immunity after exposure to the SARS-CoV-2 virus (12). Lastly, it has been demonstrated the S Protein can invade host cells through the CD147/EMMPRIN receptor and mediate membrane fusion (13, 14).

References

  1. Wu, F. et al. (2020) Nature 579:265.
  2. Tortorici, M.A. and D. Veesler (2019). Adv. Virus Res. 105:93.
  3. Bosch, B.J. et al. (2003) J. Virol. 77:8801.
  4. Belouzard, S. et al. (2009) Proc. Natl. Acad. Sci. 106:5871.
  5. Millet, J.K. and G. R. Whittaker (2015) Virus Res. 202:120.
  6. Yuan, Y. et al. (2017) Nat. Commun. 8:15092.
  7. Walls, A.C. et al. (2010) Cell 180:281.
  8. Jiang, S. et al. (2020) Trends. Immunol. https://doi.org/10.1016/j.it.2020.03.007.
  9. Ortega, J.T. et al. (2020) EXCLI J. 19:410.
  10. Wrapp, D. et al. (2020) Science 367:1260.
  11. Tai, W. et al. (2020) Cell. Mol. Immunol. https://doi.org/10.1016/j.it.2020.03.007.
  12. Okba, N. M. A. et al. (2020). Emerg. Infect. Dis. https://doi.org/10.3201/eid2607.200841.
  13. Wang, X. et al. (2020) https://doi.org/10.1038/s41423-020-0424-9.
  14. Wang, K. et al. (2020) bioRxiv https://www.biorxiv.org/content/10.1101/2020.03.14.988345v1.

Long Name

Spike Receptor Binding Domain

Entrez Gene IDs

3200426 (HCoV-HKU1); 14254594 (MERS-CoV); 1489668 (SARS-CoV); 43740568 (SARS-CoV-2)

Gene Symbol

S

UniProt

YP_009724390.1

Additional Spike RBD Products

Product Documents for Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF

For research use only

Related Research Areas

Infectious Diseases

Citations for Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF

Customer Reviews for Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF (2)

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    Recombinant SARS-CoV-2 Spike RBD His-tag Protein, CF 10500-CV
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