Recombinant BatCoV RaTG13 Spike RBD Fc Chimera Protein, CF

Recombinant BatCoV RaTG13 Spike RBD Fc Chimera (Catalog # 10556-CV) binds Recombinant Mouse ACE-2 His-tag (3437-ZN) in a functional ELISA.

2 μg/lane of Recombinant BatCoV RaTG13 Spike RBD Fc Chimera Protein (10556-CV) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 62-68 kDa and 124-136 kDa, respectively.

• Reactivity: V
• Applications: Bioactivity
• Format: Carrier-Free

Recombinant BatCoV RaTG13 Spike RBD Fc Chimera Protein, CF Summary

• Details of Functionality: Measured by its binding ability in a functional ELISA with Recombinant Mouse ACE-2 His-tag (Catalog # 3437-ZN).
• Source: Chinese Hamster Ovary cell line, CHO-derived batcov ratg13 Spike RBD protein
  

  BatCoV RaTG13 Spike RBD (Arg319-Asn542) Accession # QHR63300.2	IEGRMD	Human IgG1 (Pro100-Lys330)
  N-terminus		C-terminus

• Accession #: QHR63300.2
• N-terminal Sequence: Arg 319
• Structure / Form: Disulfide-linked homodimer
• Protein/Peptide Type: Recombinant Proteins
• Purity: >95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
• Endotoxin Note: <0.10 EU per 1 μg of the protein by the LAL method.

Applications/Dilutions

• Dilutions:
  • Bioactivity
• Theoretical MW: 52 kDa.
  Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.
• SDS-PAGE: 62-68 kDa, under reducing conditions

Packaging, Storage & Formulations

• 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.
• Buffer: Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
• Purity: >95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
• Reconstitution Instructions: Reconstitute at 500 μg/mL in PBS.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Recombinant BatCoV RaTG13 Spike RBD Fc Chimera Protein, CF

• Spike RBD

Background

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). SARS-Cov 2 is likely originated from Bat coronavirus RaTG13. Based on amino acid (aa) sequence homology, the  RBD domain of RaTG13 shares 74.9%, 90.1%, and 20.2% homology with RBD domain of SARS-CoV, SARS-CoV2, and MERS, respectively. Despite high homology to SARS-COV2, five of the six key amino acids involved in ACE2 binding are different in RaTG13, leading to >1000 fold weaker binding to human ACE2 (8, 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).

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. Malayia, J. et al. (2020) J Med. Virol. https://doi.org/10.1002/jmv.26261.
9. Wrobel, A.G. et al. (2020) Nat. struct. Mol. Biol. https://doi.org/10.1038/s41594-020-0468-7.
10. Ortega, J.T. et al. (2020) EXCLI J. 19:410.
11. Wrapp, D. et al. (2020) Science 367:1260.
12. Tai, W. et al. (2020) Cell. Mol. Immunol. https://doi.org/10.1016/j.it.2020.03.007.
13. Okba, N. M. A. et al. (2020). Emerg. Infect. Dis. https://doi.org/10.3201/eid2607.200841.
14. Wang, X. et al. (2020) https://doi.org/10.1038/s41423-020-0424-9.
15. Wang, K. et al. (2020) bioRxiv https://doi.org/10.1101/2020.03.14.988345.

Bioinformatics

• Uniprot:
  • QHR63300.2()