Journal of Microbiology and Biotechnology

  • 제30권12호
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  • Pages.1944-1949
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  • 2020
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  • 1017-7825(pISSN)
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  • 1738-8872(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
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Overexpression of Mutant Galactose Permease (ScGal2_N376F) Effective for Utilization of Glucose/Xylose or Glucose/Galactose Mixture by Engineered Kluyveromyces marxianus

  • Kwon, Deok-Ho (Department of Bioengineering and Technology, Kangwon National University) ;
  • Kim, Saet-Byeol (Department of Bioengineering and Technology, Kangwon National University) ;
  • Park, Jae-Bum (Department of Bioengineering and Technology, Kangwon National University) ;
  • Ha, Suk-Jin (Department of Bioengineering and Technology, Kangwon National University)
  • 투고 : 2020.08.19
  • 심사 : 2020.10.05
  • 발행 : 2020.12.28
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초록

Mutant sugar transporter ScGAL2-N376F was overexpressed in Kluyveromyces marxianus for efficient utilization of xylose, which is one of the main components of cellulosic biomass. K. marxianus ScGal2_N376F, the ScGAL2-N376F-overexpressing strain, exhibited 47.04 g/l of xylose consumption and 26.55 g/l of xylitol production, as compared to the parental strain (24.68 g/l and 7.03 g/l, respectively) when xylose was used as the sole carbon source. When a mixture of glucose and xylose was used as the carbon source, xylose consumption and xylitol production rates were improved by 195% and 360%, respectively, by K. marxianus ScGal2_N376F. Moreover, the glucose consumption rate was improved by 27% as compared to that in the parental strain. Overexpression of both wild-type ScGAL2 and mutant ScGAL2-N376F showed 48% and 52% enhanced sugar consumption and ethanol production rates, respectively, when a mixture of glucose and galactose was used as the carbon source, which is the main component of marine biomass. As shown in this study, ScGAL2-N376F overexpression can be applied for the efficient production of biofuels or biochemicals from cellulosic or marine biomass.

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참고문헌

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