Recombinant SARS-CoV-2 Q493K Spike RBD His-tag Protein, CF

Catalog # Availability Size / Price Qty
10791-CV-100
Recombinant SARS-CoV-2 Q493K Spike RBD His-tag Protein Binding Activity.
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Recombinant SARS-CoV-2 Q493K Spike RBD His-tag Protein, CF Summary

Product Specifications

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.
Activity
Measured by its binding ability in a functional ELISA with Recombinant Human ACE-2 His-tag (Catalog # 933-ZN).
Source
Human embryonic kidney cell, HEK293-derived sars-cov-2 Spike RBD protein
Arg319-Phe541 (Gln493Lys), with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Analysis
Arg319
Predicted Molecular Mass
26 kDa
SDS-PAGE
31-38 kDa, under reducing conditions

Product Datasheets

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

10791-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.

Data Images

Binding Activity Recombinant SARS-CoV-2 Q493K Spike RBD His-tag Protein Binding Activity. View Larger

Recombinant SARS-CoV-2 Q493K Spike RBD His-tag (Catalog # 10791-CV) binds Recombinant Human ACE-2 His-tag (933-ZN) in a functional ELISA.

SDS-PAGE Recombinant SARS-CoV-2 Q493K Spike RBD His-tag Protein SDS-PAGE. View Larger

2 μg/lane of Recombinant SARS-CoV-2 Q493K Spike RBD His-tag (Catalog # 10791-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.

Reconstitution Calculator

Reconstitution Calculator

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 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 (MB61) carrying the aa substitution Q493K, as well as N501T, in the RBD was identified in Italy in the summer of 2020 (8). It is speculated that this mutation, together with N501T, might alter the binding affinity of the spike protein to its receptor ACE-2 (8).

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. Fiorentini, S. et al. (2021) Lancet Infect. Dis. https://doi.org/10.1016/S1473-3099(21)00007-4.
Long Name
Spike Receptor Binding Domain
Entrez Gene IDs
3200426 (HCoV-HKU1); 1489668 (SARS-CoV); 43740568 (SARS-CoV-2)
Alternate Names
2019-nCoV Peplomer protein; 2019-nCoV S Protein; 2019-nCoV Spike; COVID-19 Spike; E2; Human coronavirus spike glycoprotein; Peplomer protein; S glycoprotein; S protein; SARS-COV-2 E2; SARS-COV-2 Peplomer protein; SARS-COV-2 S protein; SARS-COV-2 Spike glycoprotein; SARSCOV2 Spike protein; SARS-CoV-2; Severe Acute Respiratory Syndrome Coronavirus 2 Spike Protein; Spike glycoprotein; Spike RBD; Spike S1 RBD; Spike S1; Spike; surface glycoprotein

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