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Title: Evolved hexose transporter enhances xylose uptake and glucose/xylose co-utilization in Saccharomyces cerevisiae

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep19512· OSTI ID:1256065
 [1];  [1];  [2];  [3];  [1]
  1. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States)
  3. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Enhancing xylose utilization has been a major focus in Saccharomyces cerevisiae strain-engineering efforts. The incentive for these studies arises from the need to use all sugars in the typical carbon mixtures that comprise standard renewable plant-biomass-based carbon sources. While major advances have been made in developing utilization pathways, the efficient import of five carbon sugars into the cell remains an important bottleneck in this endeavor. Here we use an engineered S. cerevisiae BY4742 strain, containing an established heterologous xylose utilization pathway, and imposed a laboratory evolution regime with xylose as the sole carbon source. We obtained several evolved strains with improved growth phenotypes and evaluated the best candidate using genome resequencing. We observed remarkably few single nucleotide polymorphisms in the evolved strain, among which we confirmed a single amino acid change in the hexose transporter HXT7 coding sequence to be responsible for the evolved phenotype. The mutant HXT7(F79S) shows improved xylose uptake rates (Vmax = 186.4 ± 20.1 nmol·min -1 ·mg -1 ) that allows the S. cerevisiae strain to show significant growth with xylose as the sole carbon source, as well as partial co-utilization of glucose and xylose in a mixed sugar cultivation.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1256065
Alternate ID(s):
OSTI ID: 1379040
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 92 works
Citation information provided by
Web of Science

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Disruption of the transcription factors Thi2p and Nrm1p alleviates the post-glucose effect on xylose utilization in Saccharomyces cerevisiae journal April 2018
Engineering yeast with bifunctional minicellulosome and cellodextrin pathway for co-utilization of cellulose-mixed sugars journal July 2016
Directed Evolution Reveals Unexpected Epistatic Interactions That Alter Metabolic Regulation and Enable Anaerobic Xylose Use by Saccharomyces cerevisiae journal October 2016
Rhodosporidium toruloides: a new platform organism for conversion of lignocellulose into terpene biofuels and bioproducts journal October 2017
Systematic optimization of gene expression of pentose phosphate pathway enhances ethanol production from a glucose/xylose mixed medium in a recombinant Saccharomyces cerevisiae journal August 2018
Spotlight on fungal pectin utilization—from phytopathogenicity to molecular recognition and industrial applications journal January 2019
Systematic improvement of isobutanol production from d-xylose in engineered Saccharomyces cerevisiae journal October 2019
Engineering of Saccharomyces cerevisiae for the efficient co-utilization of glucose and xylose journal June 2017
Galactose to tagatose isomerization at moderate temperatures with high conversion and productivity journal October 2019
Restoration of biofuel production levels and increased tolerance under ionic liquid stress is enabled by a mutation in the essential Escherichia coli gene cydC text January 2018
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Engineering Escherichia coli for production of 4-hydroxymandelic acid using glucose–xylose mixture journal May 2016
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Genomic and phenotypic characterization of a refactored xylose-utilizing Saccharomyces cerevisiae strain for lignocellulosic biofuel production journal September 2018
Surpassing thermodynamic, kinetic, and stability barriers to isomerization catalysis for tagatose biosynthesis posted_content August 2019
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Association of improved oxidative stress tolerance and alleviation of glucose repression with superior xylose-utilization capability by a natural isolate of Saccharomyces cerevisiae journal February 2018
Exploring the xylose paradox in Saccharomyces cerevisiae through in vivo sugar signalomics of targeted deletants journal May 2019
Enhancing the Co-utilization of Biomass-Derived Mixed Sugars by Yeasts journal January 2019
Engineering xylose metabolism for production of polyhydroxybutyrate in the non-model bacterium Burkholderia sacchari journal May 2018
Production of fuels and chemicals from xylose by engineered Saccharomyces cerevisiae: a review and perspective journal May 2017
A design–build–test cycle using modeling and experiments reveals interdependencies between upper glycolysis and xylose uptake in recombinant S. cerevisiae and improves predictive capabilities of large-scale kinetic models journal June 2017
Engineering of Pentose Transport in Saccharomyces cerevisiae for Biotechnological Applications journal January 2020