1. Recombinant Proteins
  2. Viral Proteins
  3. SARS-CoV-2 Proteins
  4. SARS-CoV-2 Nucleocapsid Proteins
  5. SARS-CoV-2 N Protein (NP)
  6. Nucleocapsid Protein (His)

Nucleocapsid Protein (His)

Cat. No.: HY-P7437
COA Handling Instructions

Nucleocapsid Protein (His) expressed by E. coli systems. Nucleocapsid Protein is required for coronavirus RNA synthesis and has RNA chaperone activity.

For research use only. We do not sell to patients.

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10 μg $55 In-stock
50 μg $165 In-stock
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Top Publications Citing Use of Products
  • Biological Activity

  • Technical Parameters

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Nucleocapsid Protein (His) expressed by E. coli systems. Nucleocapsid Protein is required for coronavirus RNA synthesis and has RNA chaperone activity[1].


Coronaviruses are enveloped viruses with a positive-sense RNA genomeand and has a nucleocapsid of helical symmetry. The Nucleocapsid Protein localize to the cytoplasm and the nucleolus in both virus-infected primary cells and in cells transfected with plasmids that express N protein[1].
Nucleocapsid Protein is a basic protein and is abundant in coronaviruses, which has nonspecific binding activity toward nucleic acids, including ssRNA, ssDNA, and dsDNA. Nucleocapsid Protein is an essential RNA-binding viral protein in human coronavirus (CoV)-infected cells, is required for the replication and transcription of viral RNA. Human CoV NP is a valid target for antiviral drug research[1][2].

Biological Activity

Immobilized 2019-nCoV NP Antibody(6G9)-Fc at 5 μg/mL(100 μl/well) can bind 2019-nCoV Nucleocapsid Protein-His. The ED50 of 2019-nCoV Nucleocapsid Protein-His is 0.1-0.7 μg/mL.




E. coli




QHD43423.2 (M1-A419)

Gene ID

43740575  [NCBI]

Molecular Construction
Nucleocapsid (M1-A419)
Accession # QHD43423.2
2019-nCoV coronavirus NP Protein; 2019-nCoV np Protein; 2019-nCoV novel coronavirus Nucleoprotein Protein
AA Sequence


Molecular Weight

50-60 kDa


Greater than 95% as determined by reducing SDS-PAGE




Supplied as a 0.2 μm filter solution of 20 mM Tris-HCl, 300 mM NaCl, 10% Glycerol, 1 mM EDTA, pH 8.0.

Endotoxin Level

<1 EU/μg, determined by LAL method.

Storage & Stability

Stored at -80°C for 1 year. It is stable at -20°C for 3 months after opening. It is recommended to freeze aliquots at -80°C for extended storage. Avoid repeated freeze-thaw cycles.


Shipping with dry ice.

Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

  • Reconstitution Calculator

  • Dilution Calculator

  • Specific Activity Calculator

The reconstitution calculator equation

Volume (to add to vial) = Mass (in vial) ÷ Desired Reconstitution Concentration

Volume (to add to vial) = Mass (in vial) ÷ Desired Reconstitution Concentration
= ÷

The dilution calculator equation

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
× = ×
C1   V1   C2   V2

The specific activity calculator equation

Specific Activity (Unit/mg) = 106 ÷ Biological Activity (ED50)

Specific Activity (Unit/mg) = 106 ÷ Biological Activity (ED50)
Unit/mg = 106 ÷ ng/mL

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