MOUSE ANTI-SARS-COV-2 SPIKE (S1) RBD ANTIBODY (CE5)

Mouse anti SARS-CoV-2 spike (S1) RBD antibody (CE5) is a monoclonal antibody that is specific for the spike receptor binding domain of SARS-CoV-2, recognizing both Wuhan-Hu-1 and the Indian (Delta) variant. No cross-reactivity observed in ELISA using RBD from SARS-CoV-2 UK (Alpha), South African (Beta) or Brazilian (Gamma) variants, or SARS-CoV-2 spike subunit 2 (S2) or spike subunit 1 (S1) proteins from SARS-CoV, MERS-CoV, HCoV-NL63, HCoV-OC43, HCoV-229E and HCoV-HKU1. This antibody has been manufactured for use in ELISA immunoassay development and is suitable for use as a capture or detection antibody in ELISA assays.

PRODUCT DETAILS – MOUSE ANTI-SARS-COV-2 SPIKE (S1) RBD ANTIBODY (CE5)

• Antibody recognizes SARS-CoV-2 spike glycoprotein, subunit S1 receptor binding domain (RBD) for the Wuhan-Hu-1 and Indian (Delta) variants. It does not recognize RBD for SARS-CoV-2 UK (Alpha), South African (Beta) or Brazilian (Gamma) variants.
• It does not bind to SARS-CoV-2 (D614G, E484K Mutant) S1 (REC31902).
• No cross-reactivity observed in ELISA with SARS-CoV-2 subunit 2 (S2) or spike subunit 1 (S1) proteins from SARS-CoV, MERS-CoV, HCoV-NL63, HCoV-OC43, HCoV-229E and HCoV-HKU1.
• Isotype – Mouse IgG1
• Immunogen was recombinant spike RBD protein (REC31882, aa 1-223) expressed in HEK293 cells.
• Protein G purified from hybridoma culture supernatant.
• Suitable for use as capture or detection antibody in ELISA assays. Capture antibody with MAB12446 as detection antibody. Detection antibody with MAB12422 or MAB12446 as capture antibody.
• Antibody is neutralizing against SARS-CoV-2, but not against SARS-CoV-1 or MERS-CoV.
• Not suitable for WB.

BACKGROUND

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the causative agent of the coronavirus induced disease 19 (COVID-19) which emerged in China in late 2019, resulting in a worldwide epidemic (Zhou et al., 2020). SARS-CoV-2 is an enveloped positive-sense single-stranded RNA virus with a number of important structural proteins, including the envelope (E) protein, the membrane (M) protein, the spike (S) protein, and the nucleoprotein (N). The S protein assists in the attachment of the virus to the human cell and comprises intracellular, transmembrane, and extracellular regions. The extracellular region contains the S1 receptor binding subunit (RBD) and the S2 membrane fusion subunit. Generally, following SARS-CoV-2 infection, antibodies appear after 7–14 days and persist for weeks after viral clearance. The most commonly detected antibodies are against the N protein and the S protein. Coronavirus neutralizing antibodies primarily target the trimeric spike (S) glycoproteins on the viral surface (Wang et al., 2020) and can change the course of infection in an infected individual by supporting virus clearance or protecting an uninfected host that is exposed to the virus (Prabakaran et al., 2009). However, the antibody responses against SARS-CoV-2 remain poorly understood (Tang et al., 2020) and better understanding of how the viral coating triggers a healthy immune system’s recognition and neutralisation of the virus is critical for optimisation of diagnostic tests (Petherick, 2020). It has been suggested that spike RBD may be a better target than N for diagnostic tests (Rosadas et al., 2020). The Native Antigens monoclonal antibodies, which are specific for SARS-CoV-2, have been manufactured to meet the need for improved COVID-19 diagnostic assays.

REFERENCES

• Petherick A. Developing antibody tests for SARS-CoV-2. Lancet. 2020 Apr 4;395(10230):1101-1102.
• Prabakaran P, Zhu Z, Xiao X, Biragyn A, Dimitrov AS, Broder CC, Dimitrov DS. Potent human monoclonal antibodies against SARS CoV, Nipah and Hendra viruses. Expert Opin Biol Ther. 2009 Mar;9(3):355-68.
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