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Metabolic Engineering of Saccharomyces cerevisiae to Improve Glucan Biosynthesis

  • Zhou, Xing (The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • He, Jing (The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • Wang, Lingling (The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • Wang, Yang (The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • Du, Guocheng (The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University) ;
  • Kang, Zhen (The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University)
  • Received : 2018.12.26
  • Accepted : 2019.03.25
  • Published : 2019.05.28

Abstract

${\beta}$-Glucan is a chief structural polymer in the cell wall of yeast. ${\beta}$-Glucan has attracted intensive attention because of its wide applications in health protection and cosmetic areas. In the present study, the ${\beta}$-glucan biosynthesis pathway in S. Cerevisiae was engineered to enhance ${\beta}$-glucan accumulation. A newly identified bacterial ${\beta}-1$, 6-glucan synthase GsmA from Mycoplasma agalactiae was expressed, and increased ${\beta}$-glucan content by 43%. In addition, other pathway enzymes were investigated to direct more metabolic flux towards the building of ${\beta}$-glucan chains. We found that overexpression of Pgm2 (phosphoglucomutase) and Rho1 (a GTPase for activating glucan synthesis) significantly increased ${\beta}$-glucan accumulation. After further optimization of culture conditions, the ${\beta}$-glucan content was increased by 53.1%. This study provides a new approach to enhance ${\beta}$-glucan biosynthesis in Saccharomyces cerevisiae.

Keywords

References

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