Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation, Identification, and Characterization of Ornithine-Producing Enterococcus faecalis OA18 from Kefir Grain

케피어그레인으로 제조한 요쿠르트로부터 Enterococcus faecalis OA18 균주의 분리 및 특성규명

  • Yu, Jin-Ju (Department of Biotechnology, Woosuk University Graduate School) ;
  • Kim, Su-Gon (Department of Biotechnology, Woosuk University Graduate School) ;
  • Seo, Kyoung-Won (Department of Biotechnology, Woosuk University Graduate School) ;
  • Oh, Suk-Heung (Department of Biotechnology, Woosuk University Graduate School)
  • 유진주 (우석대학교 대학원 생명공학과) ;
  • 김수곤 (우석대학교 대학원 생명공학과) ;
  • 서경원 (우석대학교 대학원 생명공학과) ;
  • 오석흥 (우석대학교 대학원 생명공학과)
  • Received : 2011.07.26
  • Accepted : 2011.09.14
  • Published : 2011.09.30
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Abstract

Lactic acid bacteria (LAB) OA18 was isolated from yogurt prepared by using Kefir Grain as a starter. The OA18 strain was a Gram-positive, cocci-type bacterium, and able to grow anaerobically with $CO_2$ production. The OA18 strain grew well on MRS broth supplemented with 50 mM arginine at $30-37^{\circ}C$ and pH of 7.0-9.0. The optimum temperature and pH for growth are $37^{\circ}C$ and pH 7.0. The isolate fermented ribose, D-glucose, cellobiose, D-trehalose, but not L-xylose, D-melibiose, and inositol. The 16S rRNA gene sequence of the isolate showed 99.8% homology with the Enterococcus faecalis 16S rRNA gene (Access no. AB012212). Based on the biochemical characteristics and 16S rRNA gene sequence analysis data, it was identified and named as E. faecalis OA18. The E. faecalis OA18 strain showed a high ornithine-producing capacity in the presence of arginine and also showed an antimicrobial activity against Streptomyces strains such as Streptomyces coelicolor subsp. Flavus, S. coeruleorubidus, S. coeruleoaurantiacus, S. coelicolor, S. coeruleoprunus. The cell growth of E. faecalis OA18 strain was maintained in MRS broth with a NaCl concentration of 0-7%.

케피어그레인을 이용하여 제조한 요쿠르트로부터 젖산균 OA18을 분리하여 그 특성을 조사하였다. 분리된 균주는 그람양성, 구균이었으며, 혐기적 조건에서 이산화탄소를 생성하였다. 균주는 MRS 배지에서 $30-37^{\circ}C$ 온도 범위와 pH 7.0-9.0범위에서 잘 자랐으며, 성장을 위한 최적 온도와 pH는 각각 $37^{\circ}C$와 pH 7.0이었다. 분리된 젖산균은 리보오스, D-글루코오스, cellobiose, D-trehalose 등을 분해하여 산을 생성하였고, L-xylose, D-melibiose, inositol은 분해하지 못하였다. 16S rRNA gene 염기서열 분석을 통해 OA18 균주는 유전자은행(NCBI)에 등재되어 있는 Enterococcus faecalis (AB012212)의 염기서열과 99.8% 동질성이 있음을 확인하였다. 이와 같은 생화학적 특성과 염기서열 분석 결과를 토대로 분리된 균주를 Enterococcus faecalis OA18로 명명하였다. E. faecalis OA18균주는 오르니틴 생성능력과 Streptomyces coelicolor subsp. Flavus, S. coeruleorubidus, S. coeruleoaurantiacus, S. coelicolor, S. coeruleoprunus 대한 항균 활성을 보유하고 있었으며, 0-7% NaCl을 함유하는 MRS 배지에서 증식이 가능한 것으로 조사되었다.

Keywords

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