SARS-CoV-2 Spike RBD Antibody

Detects SARS-CoV-2 Spike RBD and Spike S1 in sandwich ELISAs
Catalog # Availability Size / Price Qty
MAB105806-100
MAB105806-SP
SARS-CoV-2 Spike RBD Antibody in Data
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SARS-CoV-2 Spike RBD Antibody Summary

Species Reactivity
SARS-CoV-2
Specificity
In a functional flow cytometry assay, this antibody binds and blocks SARS-CoV-2 Spike RBD interaction with human ACE-2 transfectants. Detects SARS-CoV-2 Spike RBD and SARS-CoV-2 Spike S1 in sandwich ELISAs when used in the indicated ELISA antibody pairings.
Source
Monoclonal Mouse IgG2B Clone # 1035709
Purification
Protein A or G purified from hybridoma culture supernatant
Immunogen
Spodoptera frugiperda, Sf 21 (baculovirus)-derived SARS-CoV-2 Spike S1 Subunit
Val16-Pro681
Accession # YP_009724390.1
Formulation
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
Label
Unconjugated

Applications

Recommended Concentration
Sample
ELISA

This antibody functions as a SARS-CoV-2 Spike S1 ELISA capture antibody when paired with Mouse Anti-SARS-CoV-2 Spike RBD Monoclonal Antibody (Catalog # MAB105807) and as SARS-CoV-2 Spike RBD ELISA detection antibody when paired with Mouse Anti-SARS-CoV-2 Spike RBD Monoclonal Antibody (Catalog # MAB105808).

This product is intended for assay development on various assay platforms requiring antibody pairs

 
Blockade of Receptor-ligand Interaction
50 µg/mL
In a functional flow cytometry test, 50 μg/mL of Mouse Anti-SARS-Cov-2 Spike RBD Antibody(Catalog # MAB105806) will block the binding of Recombinant SARS-Cov-2 Spike RBD His-tagged protein (Catalog # 10500-CV) to HEK293 human embryonic kidney cell line transfected with recombinant human ACE-2.

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Data Examples

Blockade of Receptor-ligand Interaction View Larger

SARS-Cov-2 Spike RBD protein binding to ACE-2-transfected Human Cell Line is Blocked by SARS-Cov-2 Spike RBD Antibody. In a functional flow cytometry test, Recombinant SARS-Cov-2 Spike RBD His-tagged protein (10500-CV) binds to HEK293 human embryonic kidney cell line transfected with recombinant human ACE-2 and eGFP. (A) Binding is completely blocked by 50 µg/mL of Mouse Anti-SARS-Cov-2 Spike RBD Monoclonal Antibody (Catalog # MAB105806) but not by (B) Mouse IgG2B Isotype Control (MAB0041). Protein binding was detected with Mouse Anti-His APC-conjugated Monoclonal Antibody (IC050A). Staining was performed using our Staining Membrane-Associated Proteins protocol.

SARS-CoV-2 Spike S1 ELISA Standard Curve. Recombinant SARS-CoV-2 Spike S1 protein was serially diluted 2-fold and captured by Mouse Anti-SARS-CoV-2 Spike RBD Monoclonal Antibody (Catalog # MAB105806) coated on a Clear Polystyrene Microplate (DY990). Mouse Anti-SARS-CoV-2 Spike RBD Monoclonal Antibody (MAB105807) was biotinylated and incubated with the protein captured on the plate. Detection of the standard curve was achieved by incubating Streptavidin-HRP (DY998) followed by Substrate Solution (DY999) and stopping the enzymatic reaction with Stop Solution (DY994).

SARS-CoV-2 Spike RBD ELISA Standard Curve. Recombinant SARS-CoV-2 Spike RBD protein was serially diluted 2-fold and captured by Mouse Anti-SARS-CoV-2 Spike RBD Monoclonal Antibody (MAB105808) coated on a Clear Polystyrene Microplate (DY990). Mouse Anti-SARS-CoV-2 Spike RBD Monoclonal Antibody (Catalog # MAB105806) was biotinylated and incubated with the protein captured on the plate. Detection of the standard curve was achieved by incubating Streptavidin-HRP (DY998) followed by Substrate Solution (DY999) and stopping the enzymatic reaction with Stop Solution (DY994).

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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Preparation and Storage

Reconstitution
Reconstitute at 0.5 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Availability
Size / Price
Qty
RB01
Shipping
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
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.
  • 6 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 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 has 65% identity with SARS-CoV-1 S1 subunit,  but only 22% homology with the MERS S1 subunit. 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 S1 subunit 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); 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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Isotype Controls

Reconstitution Buffers

Secondary Antibodies

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