Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Isolation and Identification of the Crude Oil-degrading Psychrotrophic Bacterium and the Characteristics of OCT Plasmid

저온성 원유분해 세균의 분리동정 및 OCT 프라스미드 특성

  • 김상진 (한국해양연구소해양미생물연구실) ;
  • 윤희정 (숙명여자대학교 생물학과)
  • Published : 1993.02.01
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Abstract

Psychrotrophic bacterial strains utilizing crude oil as their sole carbon and energy sources were isolated from Antarctic soil and sea sediments. One of the strains named AI-I showed the hightest activity for emulsification of crude oil and the best growth. This strain was identified as Acinetobacter calcoaceticus. A. calcoaceticus AI-I strain contains a plasmid (OCT plasmid) which was related to the utilization of alkane compounds. The molecular weight of this plasmid was estimated to be about 110 Md by agarose gel electrophoresis. The cured strain of A. calcoaceticus AI-I strain (OCT ) was not able to utilize normal hydrocarbon compounds ($C_6C_{17}$) as carbon and energy sources. A. ca/coaceticus AI-1 was resistant to ampicillin and sensitive to streptomycin, kanamycin, chloramphenicol, tetracycline. The results suggested that this strain carries a plasmid (OCT) responsible for oil utilization which is quite stable and might be concerned with antibiotics resistancy.

오랜 세월 동안 저온환경으로 유지된 남극생태계에서 원유분해능을 나타내는 저온성 세균을 24균주 분리하여 그 중 분해능이 우수한 균주를 선발하였고, 그 중 활성이 가장 높은 A1-1을 선발하여 동정한 결과 Acinetobacter calcoaceticus로 밝혀졌다. A.calcoaceticus A1-1에는 분자량 약 110Md인 plasmid 하나만이 확인됐으며 mitomycin에 의한 plasmid curing은 transfer를 계속할수록 또는 온도를 상승시킬수록 curing의 빈도가 높았다. plasmid가 제거된 균주의 탄화수소 분해능 실험결과 저온성 세균 A. calcoaceticus A1-1의 alkane 화합물 이용능력은 plasmid에 유전정보가 있음을 시사했다. 또한 본 균주의 plasmid 안정성은 세 번째 transfer 후에도 90%정도의 안정성을 보여주었고 항생제 중 ampicillin에 대한 내성을 나타내었고 streptomycin, chloramphenicol, kanamycin, tetracycline에 대해서는 감수성을 나타내었다. 이와같은 결과들은 A. calcoaceticus A 1-1가 매우 안정적이며 항새제 내성과 관련이 있는 유류이용에 관여하는 프라스미드를 갖고 있음을 시사한다.

Keywords

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