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- W3149493595 abstract "Being a microbial host for lignocellulosic biofuel production, Saccharomyces cerevisiae needs to be engineered to express a heterologous xylose pathway; however, it has been challenging to optimize the engineered strain for efficient and rapid fermentation of xylose. Deletion of PHO13 (Δ pho13 ) has been reported to be a crucial genetic perturbation in improving xylose fermentation. A confirmed mechanism of the Δ pho13 effect on xylose fermentation is that the Δ pho13 transcriptionally activates the genes in the non-oxidative pentose phosphate pathway (PPP). In the current study, we found a couple of engineered strains, of which phenotypes were not affected by Δ pho13 (Δ pho13 -negative), among many others we examined. Genome resequencing of the Δ pho13 -negative strains revealed that a loss-of-function mutation in GCR2 was responsible for the phenotype. Gcr2 is a global transcriptional factor involved in glucose metabolism. The results of RNA-seq confirmed that the deletion of GCR2 (Δ gcr2 ) led to the upregulation of PPP genes as well as downregulation of glycolytic genes, and changes were more significant under xylose conditions than those under glucose conditions. Although there was no synergistic effect between Δ pho13 and Δ gcr2 in improving xylose fermentation, these results suggested that GCR2 is a novel knockout target in improving lignocellulosic ethanol production." @default.
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- W3149493595 date "2021-03-25" @default.
- W3149493595 modified "2023-10-16" @default.
- W3149493595 title "Transcriptomic Changes Induced by Deletion of Transcriptional Regulator GCR2 on Pentose Sugar Metabolism in Saccharomyces cerevisiae" @default.
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- W3149493595 doi "https://doi.org/10.3389/fbioe.2021.654177" @default.
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