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- W4249997516 abstract "Genetically customised Saccharomyces cerevisiae that can produce ethanol and additional bio-based chemicals from sustainable agro-industrial feedstocks (for example, residual plant biomass) are of major interest to the biofuel industry. We investigated the microbial biorefinery concept of ethanol and squalene co-production using S. cerevisiae (strain YUG37-ERG1) wherein ERG1 (squalene epoxidase) transcription is under the control of a doxycycline-repressible tet0 7 -CYC1 promoter. The production of ethanol and squalene by YUG37-ERG1 grown using agriculturally sourced grass juice supplemented with doxycycline was assessed. Use of the tet0 7 -CYC1 promoter permitted regulation of ERG1 expression and squalene accumulation in YUG37-ERG1, allowing us to circumvent the lethal growth phenotype seen when ERG1 is disrupted completely. In experiments using grass juice feedstock supplemented with 0 to 50 μg doxycycline mL-1, YUG37-ERG1 fermented ethanol (22.5 [±0.5] mg mL-1) and accumulated the highest squalene content (7.89 ± 0.25 mg g-1 dry biomass) and yield (18.0 ± 4.18 mg squalene L-1) with supplements of 5.0 and 0.025 μg doxycycline mL-1, respectively. Grass juice was found to be rich in water-soluble carbohydrates (61.1 [±3.6] mg sugars mL-1) and provided excellent feedstock for growth and fermentation studies using YUG37-ERG1. Residual plant biomass components from crop production and rotation systems represent possible substrates for microbial fermentation of biofuels and bio-based compounds. This study is the first to utilise S. cerevisiae for the co-production of ethanol and squalene from grass juice. Our findings underscore the value of the biorefinery approach and demonstrate the potential to integrate microbial bioprocess engineering with existing agriculture." @default.
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- W4249997516 date "2014-01-01" @default.
- W4249997516 modified "2023-09-26" @default.
- W4249997516 title "Co-production of ethanol and squalene using a Saccharomyces cerevisiae ERG1 (squalene epoxidase) mutant and agro-industrial feedstock" @default.
- W4249997516 doi "https://doi.org/10.1186/preaccept-1839828871199897" @default.
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