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Recombinant HCoV-229E Spike RBD His-tag Protein, CF

Catalog # 10612-CV | R&D Systems, Inc. a Bio-Techne Brand
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Product Specifications


Human embryonic kidney cell, HEK293-derived hcov-229e Spike RBD protein
Ser292-Asp453, with a C-terminal 6-His tag


>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<0.10 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis


Predicted Molecular Mass

19 kDa


27-36 kDa, under reducing conditions


Measured by its binding ability in a functional ELISA with Recombinant Human Aminopeptidase N/CD13  (Catalog # 3815-ZN).

Scientific Data Images for Recombinant HCoV-229E Spike RBD His-tag Protein, CF

Recombinant HCoV-229E Spike RBD His-tag Protein Binding Activity.

Recombinant HCoV-229E Spike RBD His-tag Protein (Catalog # 10612-CV) binds Recombinant Human Aminopeptidase N/CD13 (3815-ZN) in a functional ELISA.

Recombinant HCoV-229E Spike RBD His-tag Protein SDS-PAGE.

2 μg/lane of Recombinant HCoV-229E Spike RBD His-tag Protein (Catalog # 10612-CV) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 27-36 kDa.

Formulation, Preparation and Storage

Formulation Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it 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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Spike RBD

HCoV-229E belongs to a family of viruses known as coronaviruses that are commonly comprised of a large plus-strand RNA genome and four structural proteins: Spike protein (S), Envelope protein (E), Membrane protein (M), and Nucleocapsid protein (N).  HCoV-229E is a member of the alpha-coronavirus family and was discovered in 1966 (1, 2). Other well-known human coronaviruses include three viruses that cause relatively mild respiratory disease: HCoV-NL63, HCoV-HKU1 and HCov-OC43, plus three viruses that caused the Severe Acute Respiratory Syndrome (SARS-CoV), the Middle East Respirator Syndrome (MERS-CoV), and the global pandemic Covid-19 (SARS-CoV2). HCov-229E Spike Protein (S Protein) is a glycoprotein that mediates membrane fusion and viral entry. As with most coronaviruses, proteolytic cleavage of the S protein generates two distinct peptides, S1 and S2 subunits. The S1 subunit is focused on attachment of the protein to the host receptor while the S2 subunit is involved with cell fusion.  Although HCoV-229E S protein shares high homology (56%) with HCoV-NL63, it does not employ Angiotensin-Converting Enzyme 2 (ACE2) as the receptor like HCoV-NL63. Instead, HCoV-229E engages CD13 (aminopeptidase N) for cellular entry and replication (3). The receptor binding domain (RBD) of HCoV-229E is solely responsible for receptor binding through three extended receptor binding loops (4).


  1. Hamre, D. and J.J. Procknow (1966) Proc. Soc. Exp. Biol. Med. 121:190.
  2. Van der Hoek, L. et al. (2004) Nat. Med. 10:368.
  3. Yeager, C.L. et al. (1992) Nature 357:420.
  4. Wong, A.H.M. et al. (2017) Nat. Commun. 8:1735.

Long Name

Spike Receptor Binding Domain

Entrez Gene IDs

3200426 (HCoV-HKU1); 14254594 (MERS-CoV); 1489668 (SARS-CoV); 43740568 (SARS-CoV-2)

Gene Symbol



Product Documents for Recombinant HCoV-229E Spike RBD His-tag Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant HCoV-229E Spike RBD His-tag Protein, CF

For research use only

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