Journal of Microbiology

  • 제34권4호
  • /
  • Pages.341-348
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  • 1996
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  • 1225-8873(pISSN)
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  • 1976-3794(eISSN)
한국미생물학회 (The Microbiological Society of Korea)
권호 표지

Construction of Genetically Engineered Microorganisms for Overexpression of xylE Gene Encoding Catechol 2,3-dioxygenase and the Functional Stability of the Recombinant Plasmid pSW3a Containing xylE in Aquatic Environment

  • Han, Hyo-Yung (Department of Biology, Sookmyung Womens University) ;
  • Kim, Chi-Kyung (Chungbuk National University) ;
  • Park, Yong-Keun (Research Center for Molecular Microbiology, Seoul National University) ;
  • Ka, Jong-Ok (Research Center for Molecular Microbiology, Seoul National University) ;
  • Lee, Byeong-Jae (Research Center for Molecular Microbiology, Seoul National University) ;
  • Min, Kyung-Hee (Department of Biology, Sookmyung Womens University)
  • 발행 : 1996.12.01
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초록

The regulation of xylE gene expression was examined by using vector promoter and construction of genetically engineered microorganisms (GEMs) for application in microcosm. When the xylE gene wsa subcloned into pBluscript SK(+) under the control of lac promoter (pTY1) in E. coli, and the expression was induced by IPTG, the enzyme activity of catechol 2, 3-dioxygenase was increased 4.7 times more than that of the crude extracts from transformants harboring pTY1. We suggest that the xylE gene has its own promoter at the upstream portion, because it was able to be expressed even in the absence of IPTG. A recombinant plasmid, pSW3a harboring the xylE gene under the T7 promotor, showed the activity of 14.5 units/mg protein, higher than that of parental strain, E. coli PYT1. The xylE gene in recombinant plasmid pSW3a was used as reporter gene for the application in microcosm ecosystem, since it was used for detection of xylE-positive clones by catechol spray on the agar plates. The pSW3a in E. coli was introduced into Pseudomonas patida to construct GEM strain, and examined for the exxpression and functional stability in microcosms.

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