Journal
BIORESOURCES AND BIOPROCESSING
Volume 9, Issue 1, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1186/s40643-022-00585-5
Keywords
Hemicellulosome; Simultaneous saccharification and co-fermentation; Cellulosic ethanol; Consolidated bioprocessing; Saccharomyces cerevisiae
Categories
Funding
- National Natural Science Foundation of China [31971202]
- National Key Technology RD Program [2019YFB1503802, 2020B0101070001]
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This study enhanced the hydrolysis of xylan-type hemicellulose by genetically engineering yeast, leading to increased ethanol production yield and substrate utilization rate. The designed consolidated bioprocessing-enabling S. cerevisiae consortium showed promising results in synergistic catalysis and co-fermentation.
The enhanced hydrolysis of xylan-type hemicellulose is important to maximize ethanol production yield and substrate utilization rate in lignocellulose-based simultaneous saccharification and co-fermentation system. In this study, we conduct delta-integration CRISPR Cas9 to achieve multicopy chromosomal integration with high efficiency of reductase-xylitol dehydrogenase pathway in Saccharomyces cerevisiae. Subsequently, we devise a consolidated bioprocessing-enabling S. cerevisiae consortium, in which every engineered yeast strain could secrete or display different assembly components to be adaptively assembled on the surface of scaffoldin-displaying yeast cell for synergistic catalysis and co-fermentation from steam-exploded Pennisetum purpureum. Despite the accumulation of xylitol, the maximum ethanol titer of the genetically engineered yeast strain reached 12.88 g/l with the cellulose conversion of 91.21% and hemicellulose conversion of 55.25% under 30 degrees C after 96 h with the addition of commercial cellulase. The elaborated cellulosomal organization toward genetic engineering of an industrially important microorganism presents a designed approach for advanced lignocellulolytic potential and improved capability of biofuel processing.
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