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http://dx.doi.org/10.4014/mbl.1703.03002

Optimization of Induction Conditions for Bacillus-derived Esterase Production by High-cell Density Fermentation of Recombinant Escherichia coli  

Kang, Seung-Hoon (Department of Biological Engineering, Inha University)
Min, Byung-Hyuk (Department of Biological Engineering, Inha University)
Choi, Hong-Yeol (Department of Biological Engineering, Inha University)
Kim, Dong-Il (Department of Biological Engineering, Inha University)
Publication Information
Microbiology and Biotechnology Letters / v.45, no.2, 2017 , pp. 149-154 More about this Journal
Abstract
To increase the efficiency of esterase production by Bacillus, high cell-density culture of recombinant Escherichia coli through fed batch fermentation was tested. Cells were cultured to $OD_{600}$ of 76 (35.8 g/l DCW) with dissolved oxygen level controlled to least above 30% air saturation by supplying pure oxygen. Cells were cultured to an $OD_{600}$ of 90 (42.4 g/l DCW) with glucose feeding controlled to at least 1 g/l. However, the cells reached stationary phase at the late stage of culture, despite glucose being supplied. Cells were cultured to an $OD_{600}$ of 185 (87.3 g/l DCW) by supplying additional medium with fortified yeast extract. To increase the productivity of the recombinant protein, cell growth and esterase productivity based on induction time were evaluated. Late exponential phase induction for esterase production in fed batch fermentation resulted in maximum optical density $OD_{600}$ of 190 (89 g/l DCW) and maximum esterase activity of 1745 U/l, corresponding to a 5.8-fold enhancement in esterase production, compared to the early exponential phase induction. In this study, we established fermentation methods for achieving maximum production of Bacillus-derived esterase by optimizing IPTG induction time in high-cell density culture by supplying pure oxygen and a nitrogen source.
Keywords
Esterase; high cell density fermentation; isopropyl ${\beta}$-D-1-thiogalactopyranoside induction; Escherichia coli;
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