Induction of the T7 Promoter Using Lactose for Production of Recombinant Plasminogen Kringle 1-3 in Escherichia coli

  • Lim, Hyung-Kwon (Mogam Biotechnology Institute, Department of Agricultural Biotechnology, Seoul National University) ;
  • Lee, Shi-Uk (Mogam Biotechnolgy Institute) ;
  • Chung, Soo-Il (Mogam Biotechnolgy Institute) ;
  • Jung, Kyung-Hwan (Mogam Biotechnolgy Institute, Department of Food and Biotechnology, Chungju National University) ;
  • Seo, Jin-Ho (Department of Agricultural Biotechnology, Seoul National University)
  • 발행 : 2004.04.01

초록

A plasminogen kringle domain 1 to 3, rKl-3, was expressed in Escherichia coli under the control of T7 promoter. For the cost-effective production of rKl-3, the induction process was analyzed and optimized. Induction characteristics with lactose were analyzed in terms of induction time and inducer concentration in various culture conditions including batch and high-cell-density fed-batch cultures. In the fed-batch culture, the induction around 6 h after initiation of the DO-stat fed-batch culture resulted in the highest expression level of rKI-3 among the induction points examined. The highest demand of oxygen at this point was crucial for the maximum expression level of rKI-3. As the lactose concentration increased, the expression level also increased, though the expression level showed a plateau above a concentration of 14 mM of lactose. Lactose acted less specifically than IPTG since most of it was hydrolyzed to glucose and galactose. However, using lactose, the cell growth and the maximum expression level of rKl-3 increased by 20% and 24%, respectively, compared with those using IPTG in the fed-batch culture. The lactose seemed to be hydrolyzed by intracellular and extracellular $\beta$-galactosidase liberated by cell lysis at the same time. Residual concentration of glucose was maintained to a a limit of detection by high performance liquid chromatography, and galactose was not consumed by the host strain Escherichia coli BL2l(DE3).

키워드

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