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Recombinant Human IFN-alpha B2/IFNA8 Protein, CF

Catalog # 11018-IF | R&D Systems, Inc. a Bio-Techne Brand
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Product Specifications


Human embryonic kidney cell, HEK293-derived IFN-alpha B2/IFNA8 protein


>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


23-27 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 1.20-12.0 pg/mL.

Scientific Data Images for Recombinant Human IFN-alpha B2/IFNA8 Protein, CF

Recombinant Human IFN-alpha B2/IFNA8 Protein Bioactivity.

Recombinant Human IFN-alpha B2/IFNA8 Protein (Catalog # 11018-IF) demonstrates anti-viral activity in HeLa human cervical epithelial carcinoma cells infected with encephalomyocarditis (EMC) virus. The ED50 for this effect is 1.20-12.0 pg/mL

Recombinant Human IFN-alpha B2/IFNA8 Protein SDS-PAGE.

2 μg/lane of Recombinant Human IFN-alpha B2/IFNA8 Protein (Catalog # 11018-IF) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 23-27 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 with polar packs. 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 B2/IFNA8

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 IFNA8, also known as IFN‑alpha B2, shares 60% aa sequence identity with mouse homolog. The type I IFNs bind to the interferon alpha receptor (IFNAR), which consists of two subunits: IFNAR1 (alpha-subunit) and IFNAR2 (beta -subunit) (6, 7). Individual IFNA subtypes are known to display unique efficacies to viral protection, and IFNA8 is the most potent IFNA, judging by both antiviral and antiproliferative activities (8). The reason for this higher potency is unstructured tail region of IFNA8 that gains structure during complex formation and might explain the differences in activity between IFNAs (8). IFNA8 has been shown to exhibit antiproliferative and cytotoxic effects on renal cancer cell (RCC) lines and chronic myelogenous leukemia (CML)-derived cell lines (9, 10).


  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. van Pesch, V. et al. (2004) J. Virol. 78:8219.
  7. James, C.M. et al. (2007) Vaccine. 25(10):1856.
  8. Slutzki, M. et al. (2006) J Mol Biol. 360:1019.
  9. Yanai, Y. et al. (2002) Cancer Letter 185:173.
  10. Yanai, Y. et al. (2001) J. Interferon Cytokine Res 21:1129.

Long Name

Interferon alpha 8

Alternate Names

IFN-alpha B2, IFNA8, IFNalpha B2

Entrez Gene IDs

3445 (Human)

Gene Symbol



Product Documents for Recombinant Human IFN-alpha B2/IFNA8 Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Human IFN-alpha B2/IFNA8 Protein, CF

For research use only

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