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Improved xylose uptake in Saccharomyces cerevisiae due to directed evolution of galactose permease Gal2 for sugar co-consumption

Reznicek, O., Facey, S. J., de Waal, P. P., Teunissen, A. W. R. H., de Bont, J. A. M., Nijland, J. G., Driessen, A. J. M. & Hauer, B., 15-Apr-2015, In : Journal of Applied Microbiology. 119, p. 99-111 12 p.

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DOI

AIMS: S. cerevisiae does not express any xylose-specific transporters. To enhance the xylose uptake of S. cerevisiae, directed evolution of the Gal2 transporter was performed.

METHODS AND RESULTS: Three rounds of error-prone PCR were used to generate mutants with improved xylose transport characteristics. After developing a fast and reliable high-throughput screening assay based on flow cytometry, eight mutants were obtained showing an improved uptake of xylose compared to wild-type GAL2 out of 41,200 single yeast cells. Gal2 variant 2.1 harboring five amino acid substitutions showed an increased affinity towards xylose with a faster overall sugar metabolism of glucose and xylose. Another Gal2 variant 3.1 carrying an additional amino acid substitution revealed an impaired growth on glucose but not on xylose.

CONCLUSIONS: Random mutagenesis of the S. cerevisiae Gal2 led to an increased xylose uptake capacity and decreased glucose affinity, allowing improved co-consumption.

SIGNIFICANCE AND IMPACT OF THE STUDY: Random mutagenesis is a powerful tool to evolve sugar transporters like Gal2 towards co-consumption of new substrates. Using a high-throughput screening system based on flow through cytometry various mutants were identified with improved xylose transport characteristics. The Gal2 variants in this work are a promising starting point for further engineering to improve xylose uptake from mixed sugars in biomass. This article is protected by copyright. All rights reserved.

Original languageEnglish
Pages (from-to)99-111
Number of pages12
JournalJournal of Applied Microbiology
Volume119
Publication statusPublished - 15-Apr-2015

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