SARS-CoV-2 ORF7a Antibody [Janelia Fluor® 635]

Product Discontinued

SARS-CoV-2 ORF7a Antibody [Janelia Fluor® 635] Summary

• Immunogen: Antibody was raised against a peptide corresponding to 15 amino acids near the central domain of SARS-CoV-2 ORF7a protein. The immunogen is located within 40-90 amino acids of the SARS-CoV-2 ORF7a protein.
• Isotype: IgG
• Clonality: Polyclonal
• Host: Rabbit
• Gene: ORF7a
• Purity: Peptide affinity purified

Applications/Dilutions

• Dilutions:
  • ELISA
  • Immunohistochemistry
  • Immunohistochemistry-Paraffin
• Application Notes: Optimal dilution of this antibody should be experimentally determined.

Packaging, Storage & Formulations

• Storage: Store at 4C in the dark.
• Buffer: 50mM Sodium Borate
• Preservative: 0.05% Sodium Azide
• Purity: Peptide affinity purified

Notes

Sold under license from the Howard Hughes Medical Institute, Janelia Research Campus.

Alternate Names for SARS-CoV-2 ORF7a Antibody [Janelia Fluor® 635]

• 2019-nCoV ORF7a Protein
• 2019-nCoV ORF7a
• Accessory Protein 7a
• COVID-19 Accessory Protein 7a
• COVID-19 ORF7a
• COVID-19 Protein U122
• COVID-19 Protein X4
• Human coronavirus ORF7a Protein
• ORF7a Protein
• Protein U122
• Protein X4
• SARS-CoV-2 Accessory Protein 7a
• SARS-CoV-2 Protein U122
• SARS-CoV-2 Protein X4

Background

SARS-CoV-2 Open Reading Frame 7a (ORF7a) is one of the nine downstream accessory protein open reading frames of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), the causative agent of COVID-19 (1). SARS-CoV-2 ORF7a is a type I transmembrane protein with a 121 amino acid (aa) sequence and a theoretical molecular weight of 13.7 kDa (2, 3). ORF7a localizes mostly on the Golgi apparatus but also presents on the cell surface (4). The N-terminal domain of ORF7a is comprised of 7 beta-strands that form 2 beta-sheets, arranged by an immuno-globulin-like beta-sandwich fold (2, 5). The aa sequence alignment of SARS-CoV and SARS-CoV-2's ORF7a has 85.2% sequence identity and 95.9% sequence similarity (3).

Similar to its role in SARS-CoV, ORF7a of SARS-CoV-2 is an inhibitor of the host tetherin bone marrow stromal antigen-2 (BST-2) (2, 4). Functionally, ORF7a binds to BST-2, inhibiting its viral restriction activity by blocking glycosylation (2, 4).

References

1. Michel, C. J., Mayenr, C., Poch, O., & Thompson, J. D. (2020). Characterization of accessory genes in coronavirus genomes. Virology journal. https://doi.org/10.1186/s12985-020-01402-1

2. UniProt (P0DTC7)

3. Yoshimoto F. K. (2020). The Proteins of Severe Acute Respiratory Syndrome Coronavirus-2 (SARS CoV-2 or n-COV19), the Cause of COVID-19. The protein journal. https://doi.org/10.1007/s10930-020-09901-4

4. Taylor, J. K., Coleman, C. M., Postel, S., Sisk, J. M., Bernbaum, J. G., Venkataraman, T., Sundberg, E. J., & Frieman, M. B. (2015). Severe Acute Respiratory Syndrome Coronavirus ORF7a Inhibits Bone Marrow Stromal Antigen 2 Virion Tethering through a Novel Mechanism of Glycosylation Interference. Journal of virology. https://doi.org/10.1128/JVI.02274-15

5. Nelson, C. A., Pekosz, A., Lee, C. A., Diamond, M. S., & Fremont, D. H. (2005). Structure and intracellular targeting of the SARS-coronavirus Orf7a accessory protein. Structure (London, England : 1993). https://doi.org/10.1016/j.str.2004.10.010

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

• Gene Symbol: ORF7a