All known subtypes of IFN- alpha show the same antiviral antiparasitic, antiproliferative activities. Human IFN-alpha is also a potent antiviral substance in murine, porcine, and bovine cell systems. IFN-alpha forms are produced by monocytes/macrophages, lymphoblastoid cells, fibroblasts, and a number of different cell types following induction by viruses, nucleic acids, glucocorticoid hormones, and low-molecular weight substances. All IFN-alpha subtypes possess a common conserved sequence region between positions aa115-151 while the amino-terminal ends are variable. Many IFN-alpha subtypes differ in their sequences at only one or two positions. IFN-alpha and IFN-beta are thought to bind to the same receptor. Signal transduction mechanisms elicited after binding of IFN-alpha to its receptors involves tyrosine phosphorylation (see also: PTK; protein tyrosine kinase) of various non-receptor tyrosine kinases belonging to the Janus kinases.||Source:|Recombinant protein corresponding to human IFNA2 expressed in E. coli.||Molecular Weight:|~19kD||Biological Activity:|The ED50 was determined by the dose-dependent anti-proliferation of Ovcar3 cells and was found to be <20ng/mL.||Endotoxin:|<1EU/ug (LAL)||Storage and Stability:|Lyophilized powder may be stored at -20°C. Stable for 12 months after receipt at -20°C. Reconstitute with sterile ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.Source: Recombinant, E. coli|Purity: ~95% (SDS-PAGE)|Concentration: ~0.1mg/ml (after reconstitution)|Form: Supplied as a lyophilized powder in PBS, pH 7. Reconstitute with sterile ddH2O to 0.1mg/ml.||Important Note: This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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