Journal of Microbiology and Biotechnology

  • 제11권6호
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  • Pages.915-921
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  • 2001
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  • 1017-7825(pISSN)
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  • 1738-8872(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

Enhanced and Targeted Expression of Fungal Phytase in Saccharomyces cerevisiae

  • LIM, YOUNG-YI (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • EUN-HA PARK (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • JI-HYE KIM (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • SEUNG-MOON PARK (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • HYO-SANG JANG (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • YOUN-JE PARK (TS Co. R&D Center) ;
  • SEWANG YOON (TS Co. R&D Center) ;
  • MOON-SIK YANG (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • DAE-HYUK KIM (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University)
  • 발행 : 2001.12.01
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초록

Phytase improves the bioavailability of phytate phosphorus in plant foods to humans and animals, and reduces the phosphorus pollution of animal waste. In order to express a high level of fungal phytase in Saccharomyces cerevisiae, various expression vectors were constructed with different combinations of promoters, translation enhancers, signal peptides, and terminator. Three different promoters fused to the phytase gene (phyA) from Aspergillus niger were tested: a galactokinase (GAL1) promoter, glyceraldehyde-3-phosphate dehydrogenase (GPD) promoter, and yeast hybrid ADH2-GPD promoter consisting of alcohol dehydrogenase II (ADH2) and a GPD promoter. The signal peptides of phytase, glucose oxidase (GO), and rice amylase 1A(RAmy1A) were included. Plus, the translation enhancers of the ${\Omega}$ sequence and UTR70 from the tobacco mosaic virus (TMV) and spinach, respectively, were also tested. Among the recombinant vectors, pGphyA06 containing the GPD promoter, the ${\Omega}$ sequence, RAmy1A, and GAL7 terminator expressed the highest phytase activity in a culture filtrate, which was estimated at 20 IU/ml. An intracellular localization of the expressed phytase activity in a culture filtrate, which was estimated at 20 IU/ml. An intracellular localization of the expressed phytase was also performed by inserting an endoplasmic reticulum (ER) retention signal, KDEL sequence, into the C-terminus of the phytase within the vector pHphyA-6. It appeared that the KDEL sequence directed most of the early expression of phytase into the intracellular compartment yet more than $60\%$ of the total phytase activity was still retained within the cell even after the prolonged (>3 days) incubation of the transformant. However, the intracellular enzyme activity of the transformant without a KDEL sequence was as high as that of the extracellular one, thereby strongly suggesting that the secretion of phytase in S. cerevisiae appeared to be the rate-limiting step for the expression of a large amount of extracellular recombinant phytase, when compared with other yeasts.

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참고문헌

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