Recombinant Human IFN-alpha G/IFNA5 Protein, CF Summary
Details of Functionality |
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 1.00-15.0 pg/mL. |
Source |
Human embryonic kidney cell, HEK293-derived human IFN-alpha G/IFNA5 protein Leu22-Glu189 |
Accession # |
|
N-terminal Sequence |
Leu22 |
Protein/Peptide Type |
Recombinant Proteins |
Purity |
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
Endotoxin Note |
<0.10 EU per 1 μg of the protein by the LAL method. |
Applications/Dilutions
Dilutions |
|
Theoretical MW |
20 kDa. Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors. |
SDS-PAGE |
18-22 kDa, under reducing conditions. |
Packaging, Storage & Formulations
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.
|
Buffer |
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. |
Purity |
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
Reconstitution Instructions |
Reconstitute at 100 μg/mL in PBS. |
Notes
This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.
Alternate Names for Recombinant Human IFN-alpha G/IFNA5 Protein, CF
Background
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 mature human IFNA5,
also known as IFN-alpha G, shares 40% aa sequence identity with mouse IFNA5. 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 IFNA5 has been shown to be an intermediate
inducer of IFN‑stimulated genes and anti-viral protection (8). IFNA5 is the
only IFNA subtype detected in normal liver and has been shown to induce
stronger signaling and higher expression of antiviral genes than IFNA2 in hepatocytic
cells (9). IFNA5 also exhibits strong antiviral effects against SARS‑CoV‑2
(10).
- 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.
- van Pesch, V. et al. (2004) J. Virol. 78:8219.
- James, C.M. et al. (2007) Vaccine. 25(10):1856.
- Moll, H.P. et al. (2011) Cytokine. 53:52.
- Larrea, E. et al. (2004) J Interferon Cytokine Res. 24:497.
- Schuhenn, J. et al. (2022) PNAS https://doi.org/10.1073/pnas.2111600119.
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