NDLI: Construction of lactose-consuming Saccharomyces cerevisiae for lactose fermentation into ethanol fuel

Content Provider	Springer Nature Link
Author	Zou, Jing Guo, Xuewu Shen, Tong Dong, Jian Zhang, Cuiying Xiao, Dongguang
Copyright Year	2013
Abstract	Two lactose-consuming diploid Saccharomyces cerevisiae strains, AY-51024A and AY-51024M, were constructed by expressing the LAC4 and LAC12 genes of Kluyveromyces marxianus in the host strain AY-5. In AY-51024A, both genes were targeted to the ATH1 and NTH1 gene-encoding regions to abolish the activity of acid/neutral trehalase. In AY-51024M, both genes were respectively integrated into the MIG1 and NTH1 gene-encoding regions to relieve glucose repression. Physiologic studies of the two transformants under anaerobic cultivations in glucose and galactose media indicated that the expression of both LAC genes did not physiologically burden the cells, except for AY-51024A in glucose medium. Galactose consumption was initiated at higher glucose concentrations in the MIG1 deletion strain AY-51024M than in the corresponding wild-type strain and AY-51024A, wherein galactose was consumed until glucose was completely depleted in the mixture. In lactose medium, the Sp. growth rates of AY-51024A and AY-51024M under anaerobic shake-flasks were 0.025 and 0.067 h−1, respectively. The specific lactose uptake rate and ethanol production of AY-51024M were 2.50 g lactose g CDW−1 h−1 and 23.4 g l−1, respectively, whereas those of AY-51024A were 0.98 g lactose g CDW−1 h−1 and 24.3 g lactose g CDW−1 h−1, respectively. In concentrated cheese whey powder solutions, AY-51024M produced 63.3 g l−1 ethanol from approximately 150 g l−1 initial lactose in 120 h, conversely, AY-51024A consumed 63.7 % of the initial lactose and produced 35.9 g l−1 ethanol. Therefore, relieving glucose repression is an effective strategy for constructing lactose-consuming S. cerevisiae.
Starting Page	353
Ending Page	363
Page Count	11
File Format	PDF
ISSN	13675435
Journal	Journal of Industrial Microbiology and Biotechnology
Volume Number	40
Issue Number	3-4
e-ISSN	14765535
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-24
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Lactose S. cerevisiae LAC gene MIG1 gene Glucose repression Biochemistry Inorganic Chemistry Genetic Engineering Biotechnology Bioinformatics Microbiology
Content Type	Text
Resource Type	Article
Subject	Medicine Bioengineering Applied Microbiology and Biotechnology Biotechnology

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