SARS-CoV-2 Spike RBD Antibody

Name: SARS-CoV-2 Spike RBD Antibody
Brand: R&D Systems
SKU: MAB11290

R&D Systems, part of Bio-Techne | Catalog # MAB11290

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Product Specifications
Scientific Data
Applications
Preparation & Storage
Background
Product Documents
Specific Notices

Key Product Details

Species Reactivity

SARS-CoV-2

Applications

Blockade of Receptor-ligand Interaction, Neutralization

Label

Unconjugated

Antibody Source

Monoclonal Mouse IgG_2B Clone # 1049865

View all Spike RBD Antibodies »

Product Specifications

Immunogen

Human embryonic kidney cell, HEK293-derived SARS-CoV2 SARS-CoV2 spike
Arg319-Phe541
Accession # P0DTC2

Specificity

Detects SARS-CoV2 SARS-CoV2 spike in direct ELISA.

Clonality

Monoclonal

Host

Mouse

Isotype

IgG_2B

Scientific Data Images for SARS-CoV-2 Spike RBD Antibody

SARS-CoV-2 RBD variant protein (named E484K N501Y) binding to ACE-2-transfected Human Cell Line is Blocked by SARS2-RBD Antibody.

In a functional flow cytometry test, Recombinant SARS-CoV2-RBD-E484K N501Y His-tagged protein (10788-CV) binds to HEK293 human embryonic kidney cell linetransfected with recombinant human ACE-2 and eGFP. (A) Binding is completely blocked by 25 μg/mL of Mouse Anti-SARS2-RBD Antibody (Catalog #MAB11290) but not by (B) Mouse IgG2B Isotype Control (MAB004). Protein binding was detected with Mouse Anti-His APC-conjugated Monoclonal Antibody (IC050A). Staining was performed using our Staining Membrane-associated Proteins protocol.

ACE‑2 Binding to SARS-CoV-2 E484K N501Y Spike RBD is Blocked by SARS-CoV-2 Spike RBD Antibody.

In a functional ELISA, 0.0500 - 0.700 µg/mL of this antibody will block 50% of the binding of 50 ng/mL Recombinant Human ACE‑2 (933-ZN) to Recombinant SARS-CoV-2 E484K N501Y Spike RBD His-tag (10788-CV) immobilized at 0.5 ug/mL (100 µL/well).

Applications for SARS-CoV-2 Spike RBD Antibody

Application

Recommended Usage

Blockade of Receptor-ligand Interaction

In a functional flow cytometry test, 25 μg/mL of Mouse Anti-SARS2 RBD Antibody (Catalog # MAB11290) will block the binding of Recombinant SARS-CoV2- RBD-E484K N501Y protein (Catalog # 10788-CV) to HEK293 human embryonic kidney cell line transfected with recombinant human ACE-2.

Neutralization

In a functional ELISA, 0.0500 - 0.700 μg/mL of this antibody will block 50% of the binding of 50 ng/mLRecombinant Human ACE‑2 (Catalog # 933-ZN) to Recombinant SARS-CoV-2 E484K N501Y Spike RBD His-tag (Catalog # 10788-CV) immobilized at 0.5 ug/mL (100 μL/well).

Please Note: Optimal dilutions of this antibody should be experimentally determined.

Formulation, Preparation, and Storage

Purification

Protein A or G purified from hybridoma culture supernatant

Reconstitution

Reconstitute at 0.5 mg/mL in sterile PBS. For liquid material, refer to CoA for concentration.

Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.

Shipping

Lyophilized product is shipped at ambient temperature. Liquid small pack size (-SP) is shipped with polar packs. Upon receipt, store 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.
6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Spike RBD

SARS-CoV-2, which caused 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

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