Nucleocapsid Antibody (2815D) [Unconjugated]

Recombinant SARS-CoV-2 Nucleocapsid protein was serially diluted 2-fold and captured by Rabbit Anti-SARS-CoV-2 Nucleocapsid Monoclonal Antibody (Catalog # MAB10475) coated on a Clear Polystyrene Microplate (Catalog # DY990). Rabbit Anti-SARS-CoV-2 Nucleocapsid Monoclonal Antibody (Catalog # MAB10857) was biotinylated and incubated with the protein captured on the plate. Detection of the standard curve was achieved by incubating Streptavidin-HRP (Catalog # DY998) followed by Substrate Solution (Catalog # DY999) and stopping the enzymatic reaction with Stop Solution (Catalog # DY994).

• Reactivity: V
• Applications: ELISA
• Clone: 2815D
• Clonality: Monoclonal
• Host: Rabbit
• Conjugate: Unconjugated

Nucleocapsid Antibody (2815D) [Unconjugated] Summary

• Additional Information: Recombinant Monoclonal Antibody.
• Immunogen: Spodoptera frugiperda, Sf 21 (baculovirus)-derived SARS-CoV-2 Nucleocapsid
  Met1-Ala419
  Accession # YP_009724397.2
• Specificity: Detects SARS-CoV-2 Nucleocapsid in direct ELISAs.
• Source: N/A
• Isotype: IgG
• Clonality: Monoclonal
• Host: Rabbit
• Purity Statement: Protein A or G purified from hybridoma culture supernatant

Applications/Dilutions

• Dilutions:
  • ELISA

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.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
• Buffer: 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.
• Reconstitution Instructions: Reconstitute at 0.5 mg/mL in sterile PBS.

Notes

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

Alternate Names for Nucleocapsid Antibody (2815D) [Unconjugated]

• N Protein
• Nucleocapsid protein
• Nucleocapsid
• ORF9a protein

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).  While the S, E and M proteins build up the viral envelop, the N protein is involved transcription, replication and packaging of the viral RNA genome into a helical ribonucleocapsid (RNP) (2, 3).  The SARS-CoV-2 N protein is a ~45 kDa protein composed of two independent structural domains connected by a linker region. The N-terminal region contains an RNA binding domain, the linker region interacts with the M protein and the C-terminal region contains a self-association domain (2,3). The SARS-CoV2 N protein shares 91% and 47% amino acid sequence identity with SARS-CoV-1 and MERS N protein, respectively.  The SARS-CoV-2 N protein displays VSR (viral suppressor of RNA interference) activity in mammalian cells (4). In addition, the N protein is an abundant protein during coronavirus infection and displays high immunogenic activity (5, 6), so it has been used to develop serological diagnostic kit for Covid-19 IgM and IgG antibody tests (7).

1. Wu, F. et al. (2020) Nature 579:265.
2. Chang, C. K. et al. (2006) J. Biomed. Sci. 13:59.
3. Hurst, K. R. et al. (2009) J. Virol. 83:7221.
4. Mu, J. et al. (2020) Sci. China Life Sci. doi: 10.1007/s11427-020-1692-1.
5. Che, X. Y. et al. (2004) J. Clin. Microbiol. 42:2629.
6. Guan, M. et al. (2004) Clin. Diagn. Lab. Immunol. 11:287.
7. Liu, W. et al. (2020) J. Clin. Microbiol. doi: 10.1128/JCM.00461-20.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Bioinformatics

• Uniprot:
  • YP_009724397.2()