Invitrogen™ Bovine IFN-gamma Recombinant Protein

Descripción

Bovine IFN-gamma Recombinant Protein for Western Blot, IP, ELISA

IFN gamma (Interferon gamma, Type II interferon) is a macrophage activation factor, and immune interferon that is produced primarily by T-lymphocytes and natural killer cells in response to antigens, mitogens, Staphylococcus enterotoxin B, phytohemaglutanin and other cytokines. IFN gamma is a dimeric protein consisting of two 146 amino acid subunits. IFN gamma is a glycoprotein that exists, functionally, as a homodimer of approximately 45 kDa. On SDS-PAGE, IFN gamma appears as a combination of 25, 20 and minor 15.5 kDa bands as a result of differential glycosylation. The biological activity of the IFN gamma homodimer is highly species specific. Human IFN gamma does not show cross-reactivity with mouse. IFN gamma function includes the following: antiviral activity, tumor antiproliferative activity, induction of class I and II MHC, macrophage activation, and enhanced immunoglobulin secretion by B lymphocytes. IFN gamma is involved in cytokine regulation and also acts synergistically with other cytokines. Activation of IFN gamma takes place through binding of IFN gamma receptor I and II, and activating the JAK-STAT pathway. IFN gamma does not show any homology with IFN alpha or IFN beta but human IFN gamma shows about 40% sequence homology with mouse IFN gamma. IFN gamma is upregulated by IL2, FGF basic, EGF and downregulated by vitamin D3 or DMN. IFN gamma gene mutations are associated with aplastic anemia. For dilution, use a buffer containing carrier protein, e.g. PBS with 1% BSA or a neutral media containing 10% FCS. Activity: The biological activity of recombinant bovine IFN-gamma was determined in a viral challenge assay using VS virus on MDBK cells. Plates were stained with crystal violet, a visual CPE determination was performed and the dye was then solubilized and absorbance was read. Treatment of MDBK cells with 6ng/mL of bovine IFN-gamma causes 25% Cytoprotection in the assay. Expression: The mature form of bovine IFN-gamma was expressed in Pichia pastoris, X-33. GenBank™ Accession &Num; AAB64477, amino acids 24 – 166. Refs: Picha, K.S. and P.E. Baker. (1986) Immunol. 57:131. Moscovitch-Lopatin, M. et al. (1991) Eur. J. Immunol. 21:1439.