Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His Protein, CF

R&D Systems, part of Bio-Techne | Catalog # 10846-CV

Kappa Variant L452R E484Q
R&D Systems, part of Bio-Techne
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10846-CV-100
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Key Product Details

Source

HEK293

Accession #

YP_009724390.1

Conjugate

Unconjugated

Applications

Bioactivity

View all Spike RBD Proteins and Enzymes »

Product Specifications

Source

Human embryonic kidney cell, HEK293-derived sars-cov-2 Spike RBD protein
Arg319-Phe541 (Leu452Arg, Glu484Gln), 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

31-38 kDa, under reducing conditions

Activity

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

Scientific Data Images for Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His Protein, CF

Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag Protein Binding Activity.

Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag (Catalog # 10846-CV) binds Recombinant Human ACE-2 His-tag (933-ZN) in a functional ELISA.

Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag Protein SDS-PAGE.

2 μg/lane of Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His-tag (Catalog # 10846-CV) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 31-38 kDa.
Surface plasmon resonance (SPR) sensorgram of Human ACE-2 binding to SARS-CoV-2 B.1.617.1 India variant Spike protein RBD

Binding of ACE-2 to SARS-CoV-2 B.1.617.1 India variant Spike RBD by surface plasmon resonance (SPR).

Recombinant SARS-CoV-2 B.1.617.1 India variant double mutant L452R E484Q Spike RBD protein was immobilized on a Biacore Sensor Chip CM5, and binding to recombinant human ACE-2 (933-ZN) was measured at a concentration range between 0.046 nM and 47.2 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= 1.903 nM.

Formulation, Preparation and Storage

10846-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.

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 also include MERS and SARS-CoV-1. Coronaviruses are commonly comprised of four structural proteins: Spike protein (S), Envelope protein (E), Membrane protein (M) and Nucleocapsid protein (N) (1). The SARS-CoV-2 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 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). A metallopeptidase, angiotensin-converting enzyme 2 (ACE-2), has been identified as a functional receptor for SARS-CoV-2 through interaction with a receptor binding domain (RBD) located at the C-terminus of S1 subunit (6, 7). The RBD of SARS-CoV-2 shares 73% amino acid (aa) identity with the RBD of the SARS-CoV-1, but only 22% aa identity with the RBD of MERS. A SARS-CoV-2 variant (B.1.617.1) carrying the aa substitution L452R and E484Q in the RBD was identified as a prevalent strain in India (8, 9). Whether these mutations in RBD would cause more severe symptom or decrease the efficacy of vaccine-induced immunity is still under investigation.

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. Li, W. et al. (2003) Nature 426:450.
  7. Wong, S.K. et al. (2004) J. Biol. Chem. 279:3197.
  8. Yadav, P.D. et al. (2021) bioRxiv https://doi.org/10.1101/2021.04.23.441101.
  9. Cherian, S. et al. (2021) bioRxiv https://doi.org/10.1101/2021.04.22.440932.

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 B.1.617.1 Spike RBD His Protein, CF

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Product Specific Notices for Recombinant SARS-CoV-2 B.1.617.1 Spike RBD His Protein, CF

For research use only

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