생명과학회지 (Journal of Life Science)

  • 제14권1호
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  • Pages.21-25
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  • 2004
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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Citrobacter sp.에서 crystal violet와 malachite green 색소분해에 관여하는 유전자들의 동정

Identification of Genes Involved in Decolorization of Crystal Violet and Malachite Green in Citrobacter sp.

  • Lee, Young-Mi (College of Natural Resources and Life Science, Dong-A University) ;
  • Jang, Moon-Sun (College of Natural Resources and Life Science, Dong-A University) ;
  • Kim, Seok-Jo (College of Natural Resources and Life Science, Dong-A University) ;
  • Park, Yong-Lark (College of Natural Resources and Life Science, Dong-A University) ;
  • Cho, Young-Su (College of Natural Resources and Life Science, Dong-A University) ;
  • Lee, Young-Choon (College of Natural Resources and Life Science, Dong-A University)
  • 발행 : 2004.02.01
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초록

Crystal violet와 malachite green색소 분해에 관여하는 유전자들을 규명하기 위하여 색소분해능을 가진 Citrobacter sp.의 염색체 DNA속에의 transposon 도입에 의해 생성된 무작위 변이주들이 분리되었다. 이들 변이 주들로부터 두가지 색소분해능을 소실한 14개의 변이주들이 선별되었고, 이들로부터 염색체 DNA를 분리하여 EcoRl으로 절단한 후 Tn5 단편을 probe로하여 Southern hybridization을 행한 결과, 염색체 DNA상의 각각 다른 부위에 Transposon이 Single 삽입된 5개의 변이주 (Cmg2, Cmg6, Cmg8, Cmgll, Cmg12)가 최종적으로 분리되었다. 이들 변이주들의 Transposon 삽입부위 주위의 염기서열과 이로부터 유추되는 아미노산서열을 database상에 등록되어 있는 유전자의 염기서열과 단백질의 아미노산 서열에 대한 상동성을 비교한 결과, Cmg2는 대장균 maltose trnasporter (Mal C)이고, Cmg6은 LysR-type 전사조절 단백질이며, Cmg12는 산화환원효소를 코드하는 유전자인 것으로 알려졌고, 나머지 Cmg8과 Cmg11은 아직까지 기능이 알려져 있지 않은 단백질을 코드하는 유전자인 것으로임이 판명되었다.

To identify genes involved in the decolorization of both crystal violet and malachite green, we isolated random mutants generated by transposon insertion in triphenylmethane-decolorizing bacterium, Citrobacter sp. The resulting mutant bank yielded 14 mutants with complete defect in color removal capability of both crystal violet and malachite green. Southern hybridization with a Tn5 fragment as a probe showed a single hybridized band in 5 mutants and these mutants appeared to have insertions at different sites of the chromosome. Tn5-inserted genes were isolated and the DNA sequence flanking Tn5 was determined. From comparison with a sequence database, putative protein products encoded by cmg genes were identified as follows. cmg 2 is MaIC protein in maltose transport system; cmg 6 is transcriptional regulator (LysR-type): cmg 12 is a putative oxidoreductase. The sequences deduced from two cmg genes, cmg 8 and cmg 11, showed no significant similarity to any protein with a known function. Therefore, these results indicate that these two cmg genes encode unidentified proteins responsible for decolorization of both crystal violet and malachite green.

키워드

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