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Recombinant Human IFN-alpha-1b Protein, CF

Bio-Techne includes R&D Systems | Catalog # 11015-IF

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Product Specifications


Human embryonic kidney cell, HEK293-derived human IFN-alpha 1 protein


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

Endotoxin Level

N-terminal Sequence Analysis


Predicted Molecular Mass

19 kDa


17-21 kDa, under reducing conditions.


Measured in anti-viral assays using HeLa human cervical epithelial carcinoma cells infected with encephalomyocarditis (EMC) virus. Meager, A. (1987) in Lymphokines and Interferons, a Practical Approach. Clemens, M.J. et al. (eds): IRL Press. 129.
The ED50 for this effect is 30.0-300 pg/mL.

Scientific Data Images for Recombinant Human IFN-alpha-1b Protein, CF

Recombinant Human IFN-alpha-1b Protein Bioactivity.

Recombinant Human IFN-alpha-1b Protein (Catalog # 11015-IF) demonstrates anti-viral activity in HeLa human cervical epithelial carcinoma cells infected with encephalomyocarditis (EMC) virus. The ED50 for this effect is 30.0‑300 pg/mL.

Recombinant Human IFN-alpha-1b Protein SDS-PAGE.

2 μg/lane of Recombinant Human IFN-alpha-1b Protein (Catalog # 11015-IF) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 17-21 kDa.

Formulation, Preparation and Storage

Formulation Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Reconstitution Reconstitute at 100 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: IFN-alpha 1

Interferons (IFN) are a family of cytokines with potent antiviral, antiproliferative and immunomodulatory properties, classified based on their binding specificity to cell surface receptors (1). Human IFNA2 was originally cloned in the early ‘80s and now more than a dozen closely related IFN alpha subtypes have been identified in both the human and mouse genome, each sharing about 80% amino acid (aa) sequence homology (2-4). Structurally, type I IFNs belong to the class of five helical‑bundle cytokines, with the IFNA subtypes containing 2 conserved disulfide bonds (5). The extracellular domain (ECD) of mature human IFNA1, also known as IFNA13, shares 63% aa sequence identity with mouse IFNA1. Two variants of human IFNA1 are known to exist, IFNA1a and IFNA1b, which only differ by a single residue at position 137 (6). The type I IFNs bind to the interferon alpha receptor (IFNAR), which consists of two subunits: IFNAR1 (alpha ‑subunit) and IFNAR2 (beta ‑subunit) (7, 8). IFNA1 is the most expressed IFNA subtype and primarily expressed by plasmacytoid dendritic cells (pDC), which are the earliest cells recruited to the sites of virus entry (9). Individual IFNA subtypes are known to display unique efficacies to viral protection, and IFNA1 exhibits low potency, determined by both antiviral and antiproliferative activities (10). Human IFNA1 was the first IFNA to be purified and has been tested as a treatment for various diseases (11-13).


  1. Pestka S, et al. (1987) Annu Rev Biochem. 56:727.
  2. Goeddel, D.V. et al. (1980) Nature 287:411.
  3. Matsumiya, T. et al. (2007) J. Immunol. 179:4542.
  4. Schreiber, G. and J. Piehler (2015) Trends Immunol. 36:139.
  5. Wittling, M.C. et al. (2021) Front Immunol. 11:605673.
  6. Hussain, M. et al. (2000) J Interferon Cytokine Res. 20:763.
  7. van Pesch, V. et al. (2004) J. Virol. 78:8219.
  8. James, C.M. et al. (2007) Vaccine. 25(10):1856.
  9. Szubin, R. et al. (2008). J Interferon Cytokine Res. 28:749.
  10. Moll, H.P. et al. (2011) Cytokine. 53:52.
  11. Rubinstein, M. et al. (1978) Science. 202:1289.
  12. Harper, M.S. et al. (2015) PLOS Pathogens 11:e1005254.
  13. George, J. and Mattapallil, J.J. (2018) Front Immunol. 9:299.

Long Name

Interferon alpha 1

Alternate Names

IFNA1, IFNalpha 1

Entrez Gene IDs

3439 (Human); 15962 (Mouse); 690894 (Rat)

Gene Symbol



Additional IFN-alpha 1 Products

Product Documents for Recombinant Human IFN-alpha-1b Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human IFN-alpha-1b Protein, CF

For research use only