title: Expression of biologically active recombinant equine interferon-gamma in Escherichia coli.
abstract: Interferon gamma (IFN-gamma) is a pleiotropic cytokine that is recognized as an important modulator of the immune response. To date, there is no report that prokaryocyte-derived recombinant equine IFN-gamma has antiviral activity. In this report, the gene coding equine IFN-gamma (EIFN-gamma) mature protein was cloned into pET-28a (+) and the recombinant EIFN-gamma was expressed in Escherichia coli (E. coli). The antiviral activity of expressed recombinant EIFN-gamma was evaluated by using a recombinant Vesicular Stomatitis Virus expressing green fluorescence protein (rVSV-GFP) system in the equine fetal kidney-78 cell line (EFK-78). The GFP expression in the EFK-78 cells dramatically decreased in the cells treated with EIFN-gamma in a dose-dependent manner, comparing with the mock-treated cells. The titer of antiviral activity was 1 x 10(3)AU/ml. These results demonstrated that the EIFN-gamma expressed in this study had good biological activity. Pure forms and sufficient quantities of biologically active IFN-gamma could facilitate the study of its activities in modulating immune responses both in vivo and in vitro.
authors.affiliation: Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Bai
authors.forename: Tiegang
authors.initials: T
authors.lastname: Tong
authors.forename: Guangliang
authors.initials: G
authors.lastname: Liu
authors.forename: Weiye
authors.initials: W
authors.lastname: Chen
authors.forename: Weijun
authors.initials: W
authors.lastname: Zhang
authors.forename: Qun
authors.initials: Q
authors.lastname: Wang
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.forename: Zhigao
authors.initials: Z
authors.lastname: Bu
authors.forename: Donglai
authors.initials: D
authors.lastname: Wu
mesh_terms: D000818:Animals; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000502:physiology*; D006736:Horses / Q000378:metabolism*; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000145:classification / Q000235:genetics; D012313:RNA / Q000378:metabolism; D011994:Recombinant Proteins / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D011994:Recombinant Proteins; D012313:RNA; D007371:Interferon-gamma; D004247:DNA