“…The amount of the purified recombinant hIFN-(39 mg, 46.5% of total protein) from the serum-free medium acquired in this study is as good as the yields reported when hIFN-was expressed in different systems, as in the E. coli, where 32% purified bioactive hIFN-was recovered, 44) and the high density cultivation technique due to Khalilzadeh and co-workers 15) where 0:35 AE 0:02 g, rhIFN-/g, dry E. coli cell weight was generated. About 699.79 ng/g, cells of secretory and intracellular bioactive human interferon gamma against dengue virus rhIFN-was obtained from transgenic rice suspension cells.…”
“…The amount of the purified recombinant hIFN-(39 mg, 46.5% of total protein) from the serum-free medium acquired in this study is as good as the yields reported when hIFN-was expressed in different systems, as in the E. coli, where 32% purified bioactive hIFN-was recovered, 44) and the high density cultivation technique due to Khalilzadeh and co-workers 15) where 0:35 AE 0:02 g, rhIFN-/g, dry E. coli cell weight was generated. About 699.79 ng/g, cells of secretory and intracellular bioactive human interferon gamma against dengue virus rhIFN-was obtained from transgenic rice suspension cells.…”
“…In the food and animal industries, IFN-γ is effective against a variety of economically important animal viral diseases [16,17]. Hence, the commercial interests in efficiently optimizing the production yields and specific activities of IFN-γ preparations are tremendous [18][19][20][21][22].…”
Increasing therapeutic applications for recombinant human interferon-γ (rhIFN-γ), an antiviral proinflammatory cytokine, has broadened interest in optimizing methods for its production and purification. We describe a reversed phase chromatography (RPC) procedure using Source-30 ™ matrix in the purification of rhIFN-γ from Escherichia coli that results in a higher yield than previously reported. The purified rhIFN-γ monomer from the RPC column is refolded in Tris buffer. Optimal refolding occurs at protein concentrations between 50-100 μg/ml. This method yields greater than 90% of the dimer form with a yield of 40 mg g −1 cell mass. Greater than 99% purity is achieved with further purification over a Superdex G-75 column to obtain specific activities of from 2 to 4 × 10 7 IU/mg protein as determined via cytopathic antiviral assay. The improved yield of rhIFN-γ in a simple chromatographic purification procedure promises to enhance the development and therapeutic application of this biologically potent molecule.
“…Partial proteolysis yielding at least three truncated species further contributes to protein microheterogeneity (14 -16). Extensive experimental evidence indicates that cleavage of rhIFN-␥ occurs at its C terminus adjacent to basic amino acids (17)(18)(19). Proteolysis of rhIFN-␥ is usually attributed to specific (trypsin-like) proteases; however, it is observed also in purified protein samples either stored in solution (18,20) or lyophilized (21).…”
Until recently, nonenzymatic glycosylation (glycation) was thought to affect the proteins of long living eukaryotes only. However, in a recent study (Mironova, R., Niwa, T., Hayashi, H., Dimitrova, R., and Ivanov, I.
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