Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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The Types of Extended-Spectrum ${\beta}$-Lactamases Isolated from Suyeong Sewage Disposal Plant, Busan Environmental Corporation

부산 수영공공하수처리시설에서 분리된 광범위 항균제 베타락 탐 분해효소(Extended-Spectrum ${\beta}$-Lactamase, ESBL) 유형

  • Kim, Gun-Do (College of Natural Sciences, Department of Microbiology, Pukyong National University) ;
  • Lee, Hun-Ku (College of Natural Sciences, Department of Microbiology, Pukyong National University)
  • 김군도 (부경대학교 자연과학대학 미생물학과) ;
  • 이훈구 (부경대학교 자연과학대학 미생물학과)
  • Received : 2010.03.04
  • Accepted : 2010.03.18
  • Published : 2010.03.31
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Abstract

The study performed to identify the type of ESBL against strains which are producing extendedspectrum ${\beta}$-lactamases and isolated from sewage in Suyeong sewage disposal plant, Busan Environmental Corporation. By the standard activated sludge method, Suyeong sewage disposal plant purify living and lavatory sewage gathering from the northeast Busan and the facility purify total 550,000 tons of living sewage disposal a day. 14 strains were isolated by double disk synergy test and the third generation cepha-antibiotics test. Indole, methyl-red, Voges-Proskauer, Simmon's citrate, decarboxylasedihydrolase and sugar-fermentation tests identified as Klebsiella pneumoniae (n=4) and Escherichia coli (n=10). Plasmid-mediated transmission test against isolated 14 strains proved 11 strains transmitted resistance to recipient E. coli J53 (sodium $azide^R$, $ceftazidime^S$). 9 strains of conjugant were expressed ESBL genes transferred from parental strain but 2 conjugants did not expressed. The type of ESBL from each strain was determined by isoelectric focusing points, DNA and amino acids sequencing. The results indicated that the types of ESBL transmitted to recipient E. coli J53 were TEM-1, the parental TEM type and SHV-12 type.

본 연구는 부산 환경관리공단 수영사업소 산하 수영공공하수종말처리장 하수로부터 광범위 베타락탐 분해효소(ESBL, extended-spectrum ${\beta}$-lactamase)의 유형을 파악하기 위하여 이루어졌다. 수영공공하수처리시설은 부산광역시의 동북부 생활하수와 수세식변기의 오수가 표준활성슬러지공법으로 처리되며 일 생활하수 처리량은 총 550,000톤이다. 이중디스크 확산 검사, 제 3세대 세파계열 항균제에 대한 최소억제농도 시험을 통하여 14균주를 선별하였다. Indole, methyl-red, Voges-Proskauer, Simmon's citrate, decarboxylase-dihydrolase 시험과 당 발효 시험 등 생화학 검사를 통하여 동정한 결과 Escherichia coli (10균주), Klebsiella pneumoniae (4균주)가 동정되었다. 이를 전달균주로, sodium azide에 내성을 가진 피전달 균주인 E. coli J53에 교차접합을 시켜 11균주 (E. coli 9균주, K.pneumoniae 2균주)가 접합이 이루어졌다. 접합자중 2균주는 ESBL 유전자를 전달받지 못하였고 9균주는 부모로부터 ESBL 유전자를 전달받았다. 등전점, 유전자서열과 단백질서열 분석 등을 통하여 피전달균주인 E. coli J53에 전달된 유전자유형은 TEM형의 모형인 TEM-1과 SHV-12형으로 규명되었다.

Keywords

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