Engineering of an endogenous hexose transporter into a specific D-xylose transporter facilitates glucose-xylose co-consumption in Saccharomyces cerevisiae

Jeroen G. Nijland, Hyun Yong Shin, Rene M. de Jong, Paul P. De Waal, Paul Klaassen, Arnold J. M. Driessen*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

74 Citaten (Scopus)
231 Downloads (Pure)

Samenvatting

Background: Engineering of Saccharomyces cerevisiae for the simultaneous utilization of hexose and pentose sugars is vital for cost-efficient cellulosic bioethanol production. This yeast lacks specific pentose transporters and depends on endogenous hexose transporters for low affinity pentose uptake. Consequently, engineered xylose-fermenting yeast strains first utilize D-glucose before D-xylose can be transported and metabolized.

Results: We have used an evolutionary engineering approach that depends on a quadruple hexokinase deletion xylose-fermenting S. cerevisiae strain to select for growth on D-xylose in the presence of high D-glucose concentrations. This resulted in D-glucose-tolerant growth of the yeast of D-xylose. This could be attributed to mutations at N367 in the endogenous chimeric Hxt36 transporter, causing a defect in D-glucose transport while still allowing specific uptake of D-xylose. The Hxt36-N367A variant transports D-xylose with a high rate and improved affinity, enabling the efficient co-consumption of D-glucose and D-xylose.

Conclusions: Engineering of yeast endogenous hexose transporters provides an effective strategy to construct glucose-insensitive xylose transporters that are well integrated in the carbon metabolism regulatory network, and that can be used for efficient lignocellulosic bioethanol production.

Originele taal-2English
Artikelnummer168
Aantal pagina's11
TijdschriftBiotechnology for Biofuels
Volume7
Nummer van het tijdschrift168
DOI's
StatusPublished - 29-nov-2014

Citeer dit