Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Isolation of a Potent Protease Producing Bacillus subtilis from Kimchi

김치로부터 단백질 분해 효소활성이 우수한 Bacillus subtilis 균주의 분리

  • Choi, Chan-Yeong (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Kim, Myoung-Dong (Department of Food Science and Biotechnology, Kangwon National University)
  • 최찬영 (강원대학교 식품생명공학과) ;
  • 김명동 (강원대학교 식품생명공학과)
  • Received : 2016.11.25
  • Accepted : 2017.01.10
  • Published : 2017.03.28
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Abstract

Microbial strains exhibiting proteolytic activity were isolated from kimchi, one of traditional fermented foods in Korea. Eight strains formed clear zones around their colonies when grown on TSA plates supplemented with skim milk. MBE/L865 exhibited 2.6-fold higher protease activity than that of control strain (Bacillus subtilis KCTC13112). MBE/L865 was identified as B. subtilis and deposited in the Korean Collection for Type Cultures under the accession number of KCCM43059. The optimum growth conditions for B. subtilis KCCM43059 were determined to be $37^{\circ}C$ and pH 8. The strain showed maximum protease activity ($429.37{\pm}18.65U/mg$ protein) at $60^{\circ}C$ and pH 6. Further, B. subtilis KCCM43059 had a higher salt (NaCl) tolerance than that of the control strain.

전국에서 수집한 발효식품으로부터 단백질 분해 효소활성을 보유한 균주를 분리하였다. Skim milk를 첨가한 TSA 평판배지에서 투명환을 형성한 8점의 균주 중 김치에서 분리된 MBE/L865 균주가 대조구인 KCTC13112 균주에 비하여 약 2.6배의 효소활성을 나타내었으며 Bacillus subtilis로 동정하여 한국미생물보존센터에 KCCM43059 균주로 기탁하였다. B. subtilis KCCM43059 균주의 최적 배양조건은 $37^{\circ}C$, pH 8으로 대조구인 KCTC13112 균주의 비성장속도보다 우수하였다. 반응조건 $60^{\circ}C$, pH 6에서 $429.37{\pm}18.65U/mg$ protein의 최적 효소활성을 나타내었으며 동일조건에서 대조구 균주보다 효소활성이 우수하였다. 또한 B. subtilis KCCM43059 균주는 대조구 균주에 비하여 NaCl에 상대적으로 높은 내성을 나타내었다.

Keywords

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