Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Characterization of Bacterial Community in the Ecosystem Amended with Phenol

페놀이 첨가된 생태계에서 세균 군집구조 변화의 분석

  • 김진복 (충북대학교 미생물학과 및 충북대학교 유전공학연구소) ;
  • 김치경 (충북대학교 미생물학과 및 충북대학교 유전공학연구소) ;
  • 안태석 (강원대학교 환경과학과) ;
  • 송홍규 (강원대학교 생명과학부) ;
  • 이동훈 (충북대학교 미생물학과 및 충북대학교 유전공학연구소)
  • Published : 2001.03.01
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Abstract

The effect of phenol on the change of bacterial community in the effluent water from a wastewater treatment plant was analyzed by PCR and terminal restriction fragment length polymorphism (T-RFLP). The fragments of 16S rDNA were amplified by PCR with bacterial primers, where one of the primers was biotinylated at the 5'-end. After digestion with restriction enzymes, HaeIII and AluI, the biotinylated terminal restriction tragments (T-RFs) of the digested products were selectively isolated by using streptavidin paramagnetic particles. The single-stranded DNA of T-RFs was separated by electrophoresis on a polyacrylamide gel and detected by silver staining technique. When 10 standard strains were analyzed by our method, each strain had a unique T-RF which corresponded to the calculated size from the known sequences of RDP database. The T-RFLP fingerprint generated from the effluent water was very complex, and the predominant T-RFs corresponded to members of the genus Acinetobacter, Bacillus and Pseudomonas. In addition, the perturbation of bacterial community was observed when phenol was added to the sample at the final concentration of 250 $l^{-1}$. The number of T-RFs increased and the major bacterial population could be assigned to the genus Acinetobacter, Comamonas, Cytophaga and Pseudomonas. A intense band assigned to the putative genera of Acinetobacter and Cytophaga was eluted, amplified, and sequenced. The nucleotide sequence of the T-RF showed close relationship with the sequence of Acinetobacter junii.

폐수 처리장의 방류수에 페놀을 첨가한 후 terminal restriction fragment length polymorphism (T-RFLP) 방법을 이용하여 세균군집의 구조와 변화를 조사하였다. 시료로부터 얻은 16S rRNA gene은 eubacterial primer로 증폭하였으며, 한 primer는 5'말단에 biotin을 부착하였다. 증폭된 product는 HaeIII와 AluI으로 각각 절단하였고, 절단된 단편 중에서 terminal restriction fragment (T-RF)를 streptavidin paramagnetic particle을 이용하여 분리하였다. 분리된 T-RF는 전기영동과 silver staining을 통하여 확인하였다. 본 실험의 유용성을 검증하기 위하여 표준 균주 10 균주를 대상으로 실험하였고, 균주마다 특징적인 T-RF를 가지는 것과 그 크기가 Ribosomal database project (RDP) 자료로부터 계산된 결과와 일치하는 것을 확인할 수 있었다. 한편, 대조군으로 사용된 페놀을 첨가하지 않은 방류수 시료에서는 Acinetobacter, Bacillus, Pseudomonas 속 등이 우점종을 차지하고 있었고, 페놀 (최종농도 250mg.$l^{-1}$)을 첨가한 방류수 시료에서는 Acinetobacter, Comamonas, Cytophaga, Pseudomonas 속 등이 우점종을 차지함을 알 수 있었다. Gel에서 분리한 Acinetobacter와 Cytophaga에 해당되는 T-RF는 재증폭 및 염기 서열 분석이 가능하였는데, database의 염기서열과 비교한 결과 Acinetobacter junii와 유연관계가 가깝다는 것을 확인하였다.

Keywords

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