PMID: 22586919May 17, 2012Paper

Construction of the industrial ethanol-producing strain of Saccharomyces cerevisiae able to ferment cellobiose and melibiose

Prikladnaia biokhimiia i mikrobiologiia
Liang ZhangG Y Shi

Abstract

The gene mel1, encoding alpha-galactosidase in Schizosaccharomyces pombe, and the gene bgl2, encoding and beta-glucosidase in Trichoderma reesei, were isolated and co-expressed in the industrial ethanol-producing strain of Saccharomyces cerevisiae. The resulting strains were able to grow on cellobiose and melibiose through simultaneous production of sufficient extracellular alpha-galactosidase and beta-glucosidase activity. Under aerobic conditions, the growth rate of the recombinant strain GC 1 co-expressing 2 genes could achieve 0.29 OD600 h(-1) and a biomass yield up to 7.8 g l(-1) dry cell weight on medium containing 10.0 g l(-1) cellobiose and 10.0 g l(-1) melibiose as sole carbohydrate source. Meanwhile, the new strain of S. cerevisiae CG 1 demonstrated the ability to directly produce ethanol from microcrystalline cellulose during simultaneous saccharification and fermentation process. Approximately 36.5 g l(-1) ethanol was produced from 100 g of cellulose supplied with 5 g l(-1) melibose within 60 h. The yield (g of ethanol produced/g of carbohydrate consumed) was 0.44 g/g, which corresponds to 88.0% of the theoretical yield.

References

Feb 1, 1977·Canadian Journal of Microbiology·D SternbergE T Reese
Sep 5, 2002·Microbiology and Molecular Biology Reviews : MMBR·Lee R LyndIsak S Pretorius
Dec 19, 2002·Critical Reviews in Biotechnology·Yukti BhatiaV S Bisaria
Jul 1, 1990·Biotechnology and Bioengineering·M HoltzappleC Hendrickson

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Citations

Oct 17, 2012·Bioresource Technology·Reeta Rani SinghaniaAshok Pandey

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