Human Interferon-γ (hIFN-γ) #8901
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Inquiry Info. # 8901
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Product Information
Formulation
With carrier: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 20 μg BSA per 1 μg hIFN-γ. Carrier free: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 with trehalose.
Storage
Stable in lyophilized state at 4°C for 1 year after receipt. Sterile stock solutions reconstituted with carrier protein are stable at 4°C for 2 months. Maintain Sterility. Do not store frozen.
Product Description
| MW (kDa) | 17 |
| Purity | >96% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant hIFN-γ. All lots are greater than 96% pure. |
| Endotoxin | Less than 0.01 ng endotoxin/1 μg hIFN-γ. |
| Activity | The bioactivity of hIFN-γ was determined in a virus protection assay. The ED50 of each lot is between 0.30-1.2 ng/ml. |
| Molecular Formula | Recombinant hIFN-γ has a Met on the amino terminus and has a calculated MW of 16,907. DTT-reduced and non-reduced protein migrate as 17 kDa polypeptides. The expected amino-terminus MQDPY of recombinant hIFN-γ was verified by amino acid sequencing. |
Source / Purification
Recombinant human IFN-γ was expressed in E. coli and is supplied in a lyophilized form. A greater than 95% purity was determined by SDS-PAGE. Endotoxin levels are less than or equal to 1 EU / 1 μg hIGF-II.
Background
IFN-γ plays key roles in both the innate and adaptive immune response. IFN-γ activates the cytotoxic activity of innate immune cells such as macrophages and NK cells (1,2). IFN-γ production by NK cells and antigen-presenting cells (APCs) promotes the cell mediated adaptive immunity by inducing IFN-γ production by T lymphocytes, increased class I and class II MHC expression, and enhancing peptide antigen presentation (1). The anti-viral activity of IFN-γ is due to its induction of PKR and other regulatory proteins. Binding of IFN-γ to the IFNGR1/IFNGR2 complex promotes dimerization of the receptor complexes to form (IFNGR1/IFNGR2)2 -IFN-γ dimer. Binding induces a conformational change in receptor intracellular domains and signaling involves Jak1, Jak2 and Stat1 (3). The critical role of IFN-γ in amplification of immune surveillance and function is supported by increased susceptibility to pathogen infection by IFN-γ or IFNGR knockout mice and in humans with inactivating mutations in IFNGR1 or IFNGR2. IFN-γ also appears to have a role in atherosclerosis (4).
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For Research Use Only. Not For Use In Diagnostic Procedures.
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