Product Specifications for Recombinant Human IFN-alpha-1b Protein, CF
Human embryonic kidney cell, HEK293-derived human IFN-alpha 1 protein Cys24-Glu189
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
<0.10 EU per 1 μg of the protein by the LAL method.
N-terminal sequence Analysis
Predicted Molecular Mass
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 Examples 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
What does CF mean?
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our
Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant
protein to be stored at a more dilute concentration.
The carrier free version does not contain BSA.
What formulation is right for me?
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or
as an ELISA standard.
In contrast, the carrier free protein is recommended for applications, in which the presence of BSA
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
Reconstitute at 100 μg/mL in PBS.
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).
Pestka S, et al. (1987) Annu Rev Biochem. 56:727.
Goeddel, D.V. et al. (1980) Nature 287:411.
Matsumiya, T. et al. (2007) J. Immunol. 179:4542.
Schreiber, G. and J. Piehler (2015) Trends Immunol. 36:139.
Wittling, M.C. et al. (2021) Front Immunol. 11:605673.
Hussain, M. et al. (2000) J Interferon Cytokine Res. 20:763.
van Pesch, V. et al. (2004) J. Virol. 78:8219.
James, C.M. et al. (2007) Vaccine. 25(10):1856.
Szubin, R. et al. (2008). J Interferon Cytokine Res. 28:749.
Moll, H.P. et al. (2011) Cytokine. 53:52.
Rubinstein, M. et al. (1978) Science. 202:1289.
Harper, M.S. et al. (2015) PLOS Pathogens 11:e1005254.
George, J. and Mattapallil, J.J. (2018) Front Immunol. 9:299.
Interferon alpha 1
Entrez Gene IDs
3439 (Human); 15962 (Mouse); 690894 (Rat)
IFN-alpha 1, IFNA1, IFNalpha 1
Citations for Recombinant Human IFN-alpha-1b Protein, CF
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Product Documents for Recombinant Human IFN-alpha-1b Protein, CF
Which Brands are Currently Available on bio‑techne.com? R&D Systems, Tocris Bioscience and ProteinSimple branded products are available to purchase through bio‑techne.com. ProteinSimple branded instruments are available to quote. ACD branded products will be available on bio‑techne.com in the near future. Novus Biologicals branded products are not currently available on bio‑techne.com and can be found at novusbio.com.
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