Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Types of Extended-Spectrum β-Lactamase Produced in Enteric Bacteria Isolated from Sewage Plant Drain Water

하수처리수에서 분리된 장내세균의 광범위 베타락탐분해효소의 유형

  • Kim, Gun-Do (Department of Microbiology, College of Natural Sciences, Pukyong National University) ;
  • Lee, Hun-Ku (Department of Microbiology, College of Natural Sciences, Pukyong National University)
  • 김군도 (부경대학교 자연과학대학 미생물학과) ;
  • 이훈구 (부경대학교 자연과학대학 미생물학과)
  • Received : 2010.04.06
  • Accepted : 2010.05.25
  • Published : 2010.05.31
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Abstract

This study focused on typing of the extended-spectrum $\beta$-lactamase (ESBL) produced in organisms isolated from a natural environment, rather than a clinical setting. Samples were collected from drain water issuing from a sewage plant in Kwanganri (Busan, Korea). Following double disk synergy testing, 29 strains were selected as potential ESBL positive strains. Of these, 15 strains were transconjugants of the sodium azide resistant recipient strain Escherichia coli J53 and analyzed biochemically including indole, methyl-red, Voges-Proskauer, Simmon's citrate, decarboxylase-dihydrolase and sugar-fermentation tests. The tests classified the 15 strains as Klebsiella pneumoniae (n=13) and Escherichia coli (n=2). The type of ESBL from each strain was deduced by isoelectric focusing point analysis and DNA sequencing. The results indicated that the types of ESBL were SHV-12 (n=4) and SHV-12/TEM-1 (n=9) from K. pneumoniae and TEM-1 (n=2) from E. coli strains.

본 연구는 임상검체만이 아닌 주변 생활환경에도 광범위 베타 락탐분해효소를 생성하는 균주(extended-spectrum $\beta$-lactamase, ESBL)가 존재하는지를 확인하고 만약 존재할 경우 그 균주를 분리하고 ESBL유형을 알아보기 위하여 실시되었다. 부산 광안리 하수처리 방류수에서 이중 디스크 확산 검사 결과 양성반응을 나타낸 29균주를 선별하였다. 이중 sodium azide에 내성을 가진 피전달 균주인 Escherichia coli J5에 교차접합이 이루어진 15균주를 대상으로 indole, methyl-red, Voges-Proskauer, Simmon's citrate 시험과 decarboxylase-dihydrolase 및 여러 종류의 당 발효 시험 등 생화학 검사를 실시한 결과 Klebsiella pneumoniae(13균주)와 Escherichia coli(2균주)가 동정되었다. 등전점, PCR, 유전자서열 분석을 실시하여 ESBL 유형을 결정하였다. Klebsiella pneumoniae의 ESBL 생성유형은 SHV-12(4균주)와 SHV-12/TEM-1(9균주)의 2종류로 구분되었고, Escherichia coli의 ESBL 생성유형은 TEM-1(2균주)로 판명되었다.

Keywords

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