Bacillus licheniformis ATCC 27811이 생산하는 내열성 $\alpha$-amylase 유전자의 Cloning 및 발현

Cloning and Expression of Thermostable Alpha-amylase Gene in Escherichia coli from Bacillus licheniformis ATCC 27811

  • 김인철 (서울대학교 식품공학과) ;
  • 장소영 (서울대학교 식품공학과) ;
  • 차재호 (서울대학교 식품공학과) ;
  • 고영환 (서울대학교 식품공학과) ;
  • 박관화 (서울대학교 식품공학과) ;
  • 노현모 (서울대학교 동물학과)
  • Kim, I.C. (Department of Food Science and Technology, Seoul National University) ;
  • Jang, S.Y. (Department of Food Science and Technology, Seoul National University) ;
  • Cha, J.H. (Department of Food Science and Technology, Seoul National University) ;
  • Ko, Y.H. (Department of Food Science and Technology, Seoul National University) ;
  • Park, K.H. (Department of Food Science and Technology, Seoul National University) ;
  • Rho, H.M. (Department of Zoology, Seoul National University)
  • 발행 : 1988.10.01

초록

Bacillus licheniformis ATCC 27811의 염색체 DNA를 분리하며 제한효소인 EcoRI으로 부분절단하고, 동일 효소로 절단한 plasmid pBR322에 ligation 시킨 뒤 E. coli HB 101에 형질전환시켜 alpha-amylase 형질을 보여주는 균주를 선별하였다. 선별된 형질전환체로부터 alpha-amylase를 분리하며, 원 균주인 Bac. licheniformis가 생산하는 alpha-amylase와 pH 및 온도특성을 비교하며 모균주와 같은 성질을 가졌음을 확인하였다. 재조합체 DNA로부터 얻은 Insert는 대략 3.1kb 정도였고, HindIII, ClaI, PstI, SalI Site를 한개씩 가지고 있었다.

The gene for thermostable alpha-amylase from the thermostable bacterium Bacillus licheniformis has been cloned and expressed in Escherichia coli. The Alpha-amylase producing E. coli cells contained a 7.4 kb chimeric plasmid (pTA 322) which was composed of the vector pBR322 and a 3.1 kb EcoRI fragment of B. licheniformis DNA. The alpha-amylase from cloned fragement was shown to be indistlnguishable from that of B. licheniformis in the optimum temperature of 9$0^{\circ}C$, heat stability and the pH stability. The foreign gene was expressed efficiently in E. coli and stably maintained.

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