생명과학회지 (Journal of Life Science)

  • 제14권4호
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  • Pages.582-588
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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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파라치온 분해 세균 Pseudomonas rhodesiae H5의 특성

Characteristics of the Parathion Degrading Pseudomonas rhodesiae H5.

  • 윤남경 (한남대학교 이과대학 미생물학과) ;
  • 박경량 (한남대학교 이과대학 미생물학과)
  • 발행 : 2004.08.01
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초록

대전 근교의 농약으로 오염된 토양으로부터 파라치온을 분해하는 81균주를 분리한 후, 분리균주들중 파라치온 이용능이 가장 우수한 한 균주를 최종선별하였다. 최종 선별된 균은 생리생화학적 조사와 16S rRNA 염기 서열분석 등을 통하여 Pseudomonas rhodesiae H5로 확인되었다. Pseudomonas rhodesiae H5는 다양한 당을 이용하였으나 sorbose는 이용하지 못하였다. 또 이 균주는 ampicillin, spectinomycin, mito-mycin C에는 일부 저항성을 가지나 kanamycin, chloram-phenicol에는 저항성을 나타내지 않았다. 그리고 $BaCl_2$, LiCl, $MnSO_4$등의 중금속에서는 mg/ml 단위까지 강한 내성을 나타냈다. Pseudomonas rhodesiae H5의 최적 생장 조건은 3$0^{\circ}C$, pH 7.0 이었고, 이 균주는 파라치온의 organophosphate bond를 가수분해하여 p-nitrophenol를 생성한 후 ortho-ring cleavage를 거쳐 중심대사에 연결되는 것으로 추정된다.

Eighty one bacterial strains of parathion degrading bacteria were isolated from soil samples that were contaminated with pesticide in Daejeon area. Among them, one bacterial strain was finally selected in media containing parathion as the sole source of carbon and energy, and this strain was identified as Pseudomonas rhodesiae H5 through physiological and biochemical tests, and analysis of its 16S rRNA sequence. Pseudomonas rhodesiae H5 was able to utilize various carbohydrates but did not utilize sorbose as sole carbon source. Pseudomonas rhodesiae H5 was resistance to ampicillin, spectinomycin, and mitomycin C but sensitive to kanamycin and chloramphenicol. And this strain showed high resistance up to several milligrams of heavy metals such as $BaCl_2$, LiCl, and $MnSO_4$. Optimal growth condition for temperature and pH of P. rhodesiae H5 was 3$0^{\circ}C$, and pH 7.0, respectively. It can be presumed that P. rhodesiae H5 hydrolyzed an organophosphate bond of parathion, forming p-nitrophenol, and then metabolized via ortho-ring cleavage mechanism.

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