Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation of Tetracycline-resistant Lactic Acid Bacteria from Kimchi

김치에서 tetracycline 내성 유산균의 분리

  • Kang, Hyo-Jin (Department of Microbiology, College of Natural Sciences, Kyungpook National University) ;
  • Kim, Byung-Chun (Department of Microbiology, College of Natural Sciences, Kyungpook National University) ;
  • Park, Wan (Department of Microbiology, College of Natural Sciences, Kyungpook National University)
  • 강효진 (경북대학교 자연과학대학 미생물학과) ;
  • 김병천 (경북대학교 자연과학대학 미생물학) ;
  • 박완 (경북대학교 자연과학대학 미생물학과)
  • Published : 2004.03.01
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Abstract

Tetracycline resistant bacterial strains were isolated from 10 batches of Kimchi among 50 batches collected in Taegu restrict. The MIC of tetracycline ranged between 25 and> 100 ㎖/l. Total genomic DNA preparation from all 10 tetracycline resistant lactic acid bacterial isolates were subjected to PCR amplification with class-specific primers for tet(M) and tet(O). In only one isolate, HJ9, tet(M) was detected. By Southern blotting and hybridization with a tet(M)-specific probe, the tet(M) gene of HJ9 isolate could be localized on a plasmid. The partial nucleotide sequence and deduced amino acid sequence of tet(M) of HJ9 showed 90-99% and 94-100% homology to those of Gram positive bacteria, respectively. With sequencing of 16S rRNA, HJ9 isolate from Kimchi was identified as Lactobacillus sakei. From these results, Kimchi can be considered potential vehicle for the spread of antibiotic-resistant lactic acid bacteria along the food chain to the consumer.

대구지역에서 수집한 50점의 김치 중에서 10점의 김치로부터 tetracycline내성 세균을 분리하였다. 이 균주들의 tetracycline에 대한 MIC는 25-100 mg/l 이상의 범위로 분포하였으며 다른 항생제에 대한 내성도 다양하였다. tet(M), tet(O)특이적 primer를 이용한 PCR에서 HJ9 한 균주에서만 tet(M)유전자가 검출되었으며, tet(M)은 플라스미드상에 존재하는 것으로 나타났다. HJ9 균주의 tet(M)부분 염기서열을 분석한 결과 기존에 보고된 Gram양성균의 tet(M)의 DNA 염기서열 및 아미노산 서열과 각각 90-99%, 94-100%의 높은 상동성을 보였다. 165 rRNA 염기서열을 분석한 결과 HJ9 균주는 Lactobacillus sakei로 동정되었다. 김치를 통하여서도 항생제 내성 유전자의 전파 확산이 가능할 것으로 생각된다.

Keywords

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