Abstract
The toxicity of the recombinant protein towards the expression host remains a significant deterrent for bioprocess development. In this study, the expression of human granulocyte macrophage-colony stimulating factor (hGM-CSF), which is known to be toxic to its host, was enhanced many folds using a combination of genetic and bioprocess strategies in Escherichia coli. The N terminus attachment of endoxylanase and asparaginase signal sequences from Bacillus subtilis and E. coli, respectively, in combination with and without His-tag, considerably improved expression levels. Induction and media optimization studies in shake flask cultures resulted in a maximal hGM-CSF concentration of 365 mg/L in the form of inclusion bodies (IBs) with a specific product yield (Y P/X) of 120 mg/g dry cell weight in case of the asparaginase signal. Culturing the cells in nutrient rich Terrific broth maintained the specific product yields (Y P/X) while a 6.6-fold higher volumetric concentration of both product and biomass was obtained. The purification and refolding steps were optimized resulting in a 95% pure protein with a fairly high refolding yield of 45%. The biological activity of the refolded protein was confirmed by a cell proliferation assay on hGM-CSF dependent human erythroleukemia TF-1 cells. This study demonstrated that this indeed is a viable route for the efficient production of hGM-CSF.
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The authors are thankful to Prof. R. C. Kuhad, Department of Microbiology, University of Delhi South Campus, for his advice during the preparation of manuscript.
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Khasa, Y.P., Khushoo, A., Tapryal, S. et al. Optimization of Human Granulocyte Macrophage-Colony Stimulating Factor (hGM-CSF) Expression Using Asparaginase and Xylanase Gene’s Signal Sequences in Escherichia coli . Appl Biochem Biotechnol 165, 523–537 (2011). https://doi.org/10.1007/s12010-011-9272-5
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DOI: https://doi.org/10.1007/s12010-011-9272-5