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Identification of the bphC Gene for meta-Cleavage of Aromatic Pollutants from a Metagenomic Library Derived from Lake Waters

Moon Mi-Sook    (Department of Microbiology and Biotechnology, and Biotechnology Research Institute, Chungbuk National University   ); Lee Dong-Hun    (Department of Microbiology and Biotechnology, and Biotechnology Research Institute, Chungbuk National University   ); Kim Chi-Kyung    (Department of Microbiology and Biotechnology, and Biotechnology Research Institute, Chungbuk National University  );
  • 초록

    Useful genes can be Screened from various environments by construction of metagenomic DNA libraries. In this study, water samples were collected from several lakes in mid Korea, and analyzed by T-RFLP to examine diversities of the microbial communities. The crude DNAs r were extracted by the SDS-based freezing-thawing method, and then further purified using an $UltraClean^{TM}$ kit (MoBio, USA). The metagenomic libraries were constructed with the DNAs partially digested with EcoR I, BamH I, and Sac II in Escherichia coli DH 10B using the pBACe3.6 vector. About 44.0 Mb of metagenomic libraries were obtained with average inserts 13-15 kb in size. The bphC genes responsible for degradation of aromatic hydrocarbons via mets-cleavage were identified from the metagenomic libraries by colony hybridization using the bphC specific sequence as a probe. The 2,3-dihydroxybiphenyl (2, 3-DHBP) dioxygenase gene (bphC ), capable of degradation of 2,3-DHBP, was cloned and its nucleotide Sequences analyzed. The genes consisted of 966 and 897 base pairs with an ATG initiation codon and a TGA termination codon. The activity of the 2,3-DHBP dioxygenase was highly expressed to 2,3-DHBP and Showed a broad substrate range to 2,3-DHBP, catechol, 3-methylcatechol and 4-methylcatechol. These results in-dicated that the bphC gene identified from the metagenomes derived from lake water might be useful in the development of a potent strain for degradation of aromatic pollutants.


  • 주제어

    metagenomic libraries .   bphC .   2,3-DHBP dioxygenase .   aromatic pollutants.  

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