Production of Inulooligosaccharides by Endoinulinase Expressed in Saccharomyces cerevisiae

Saccharomyces cerevisiae에서 발현된 Endoinulinase를 이용한 Inulooligosaccharides의 생산

  • Kim Hyun-Chul (Department of Biomaterial Control, Dong-Eui University) ;
  • Kim Hyun-Jin (Department of Biotechnology & Bioengineering, Dong-Eui University) ;
  • Kim Byung-Woo (Department of Life Science & Biotechnology, Dong-Eui University) ;
  • Kwon Hyun-Ju (Department of Life Science & Biotechnology, Dong-Eui University) ;
  • Nam Soo-Wan (Department of Biotechnology & Bioengineering, Dong-Eui University)
  • 김현철 (동의대학교 바이오물질제어학과) ;
  • 김현진 (동의대학교 생명공학과) ;
  • 김병우 (동의대학교 생명응용과학과) ;
  • 권현주 (동의대학교 생명응용과학과) ;
  • 남수완 (동의대학교 생명공학과)
  • Published : 2005.12.01


The endoinulinase gene (inu, 2.733 kb, EC from Paenibacillus polymyxa was subcloned into an Escherichia coli-yeast shuttle vector with GALl promoter for the expression in Saccharomyces cerevisiae. The constructed plasmid, pYGENIU27 (8.6 kb) was introduced into S. cerevisiae SEY2102 cell and then the yeast transformant was selected on the synthetic defined media lacking uracil and on the inulin-containing media. The recombinant endoinulinase was predominantly localized in the periplasmic space of the yeast cell. The total activity of the endoinulinase reached 1.81 unit/ml by cultivation of yeast transformant on YPDG medium. The optimized conditions determined for the inulooligosaccharides (IOSs) production from inulin were as follows; pH, 8.0; reaction temperature, $45^{\circ}C$; inulin source, Jerusalem artichoke. Enzyme activity was stably maintained up to the pH of 10.0. Under the optimized condition and with endoinulinase of 36 unit/g-inulin, IOSs started to be produced after 10 min of enzymatic reaction. By the reaction with inulin, IOSs consisting of inulobiose (F2), inulotriose (F3), and inulotetraose (F4) were produced and F3 was the major product. Consequently, these data would be used as a fundamental parameters for the production of functional sweetener IOSs from inulin by recombinant yeast endoinulinase.


Endoinulinase;Paenibacillus polymyxa;inulin;inulooligosaccharides;Saccharomyces cerevisiae


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