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You are here:Home » Molecular Biology » MB-Growth Factors-Interferon » Interferon gamma, Recombinant, Human (IFNg)

Interferon gamma, Recombinant, Human (IFNg)


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Interferon-gamma (IFN-g) is a lymphoid factor which possesses potent anti-viral activity. It has also been shown to stimulate macrophages and NK cells. Human IFN-g is a 16.7kD protein. Interferon gamma is the only known type II interferon. Under physiological conditions, interferon gamma is induced when T-lymphocytes, previously sensitized to an antigen, are exposed to the same antigen, hence its other name: immune interferon. IFNg is produced by lymphocytes expressing the surface antigens CD4 and CD8. The synthesis of IFN-gamma is induced, among other things, by Interleukin-2 , FGF-basic and EGF. Interferon gamma has demonstrated significant anti-proliferative effects in in vivo studies; however, its therapeutic effects have been limited. Endogenous IFN-g has been shown to be required for the protection of mice against mycobacteri and leishmaniasis. In the U.S., human IFN-g has been approved for reducing the frequency and severity of infections in patients with chronic granulomatous disease.
Catalog #I7662-16
Recombinant Human Interferon gamma produced in E. coli is a single, non-glycosylated, polypeptide chain containing 144 amino acids and having a molecular mass of 16.879kD.
Biological ActivityBiological Activity:
IFNg is fully biologically active when compared to standard. The specific activity as determined in a viral resistance assay is <0.05ng/ml, corresponding to a specific activity of 2.0x10e7 IU/mg.
Protein ContentProtein quantitation was carried out by two independent methods:
1. UV spectroscopy at 280nm using the absorbency value of 0.640 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. Analysis by RP-HPLC, using a standard solution of IFN-gamma as a Reference Standard.
Storage and StabilityLyophilized powder may be stored at -20°C. Stable for 12 months at -20°C. Reconstitute with sterile ddH2O, 0.1% HSA or BSA. 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.
Molecular Weight16.879kD
SourceE. coli
Purity>95% by RP-HPLC and SDS-PAGE. Chromatographically purified.
FormSupplied as a lyophilized powder in 10mM sodium phosphate buffer, pH 7.4. Reconstitute in sterile dH2O, 0.1% HSA or BSA to a concentration 0.1mg/ml. Can be further diluted to other aqueous solutions.
Important NoteThis 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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