Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Isolation and Enzyme Production of a Neutral Protease-Producing Strain, Bacillus sp. DS-1.

Neutral Pretense를 생산하는 Bacillus sp. DS-1 균주의 분리와 효소 생산성

  • 전대식 (배재대학교 생명과학부) ;
  • 강대경 (이지바이오시스템 생물자원연구소) ;
  • 김하근 (배재대학교 생명과학부)
  • Published : 2002.12.01
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Abstract

A bacterium producing the neutral pretense was isolated from soil, and was identified as Bacillus sp. DS-1 by 16S rRNA sequence comparison and biochemical determinations. The production of protease from Bacillus sp. DS-1 was increased 20% and 30% by the additions of 1% glucose and 1% yeast extract, respectively. The optimum pH and temperature for the protease activity were pH 7.0 and 55$^{\circ}C$. Bacillus sp. DS-1 produced a metalloprotease as a major protease in culture medium, since the pretense activity in culture supernatant was inhibited by the presence of 1 mM EDTA significantly.

토양으로부터 pretease활성이 우수한 균주를 선별하여 형태학적, 생화학적 동정과정 및 16 rRNA염기서열 분석 등의 방법을 이용하여 Bacillus sp. DS-1으로 동정하였다. Bacillus sp. DS-1은 초기 배지의 pH가 7.0인 조건에서 정지기에서 가장 높은 활성을 나타내었다. Bacillus sp. DS-1으로부터 protease를 생산하기 위해 탄소원으로는 1% glucose, 질소원으로는 1% yeast extract를 첨가할 때 대조구와 비교하여 각각 20%와 30% 더 효과적인 것으로 나타났다. Bacillus sp. DS-1이 생산하는 protease의 최적활성은 55$^{\circ}C$와 pH 7.0이었다. 1 mM의 EDTA첨가에 의해 protease활성이 84%실활 되었고 이 결과로부터 Bacillus sp. DS-1의 상등액에 존재하는 주된 protease 활성은 metalloprotease임을 알 수 있었다.

Keywords

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