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- W2345504106 abstract "We evolved Thermus thermophilus to efficiently co-utilize glucose and xylose, the two most abundant sugars in lignocellulosic biomass, at high temperatures without carbon catabolite repression. To generate the strain, T. thermophilus HB8 was first evolved on glucose to improve its growth characteristics, followed by evolution on xylose. The resulting strain, T. thermophilus LC113, was characterized in growth studies, by whole genome sequencing, and 13C-metabolic flux analysis (13C-MFA) with [1,6-13C]glucose, [5-13C]xylose, and [1,6-13C]glucose+[5-13C]xylose as isotopic tracers. Compared to the starting strain, the evolved strain had an increased growth rate (~2-fold), increased biomass yield, increased tolerance to high temperatures up to 90 °C, and gained the ability to grow on xylose in minimal medium. At the optimal growth temperature of 81 °C, the maximum growth rate on glucose and xylose was 0.44 and 0.46 h−1, respectively. In medium containing glucose and xylose the strain efficiently co-utilized the two sugars. 13C-MFA results provided insights into the metabolism of T. thermophilus LC113 that allows efficient co-utilization of glucose and xylose. Specifically, 13C-MFA revealed that metabolic fluxes in the upper part of metabolism adjust flexibly to sugar availability, while fluxes in the lower part of metabolism remain relatively constant. Whole genome sequence analysis revealed two large structural changes that can help explain the physiology of the evolved strain: a duplication of a chromosome region that contains many sugar transporters, and a 5x multiplication of a region on the pVV8 plasmid that contains xylose isomerase and xylulokinase genes, the first two enzymes of xylose catabolism. Taken together, 13C-MFA and genome sequence analysis provided complementary insights into the physiology of the evolved strain." @default.
- W2345504106 created "2016-06-24" @default.
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- W2345504106 date "2016-09-01" @default.
- W2345504106 modified "2023-09-26" @default.
- W2345504106 title "Co-utilization of glucose and xylose by evolved Thermus thermophilus LC113 strain elucidated by 13 C metabolic flux analysis and whole genome sequencing" @default.
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- W2345504106 doi "https://doi.org/10.1016/j.ymben.2016.05.001" @default.
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