jf9b07113_si_001.pdf (2.39 MB)
Identification and Characterization of an Efficient d‑Xylose Transporter in Saccharomyces cerevisiae
journal contribution
posted on 2020-02-24, 19:08 authored by Yi Jiang, Yu Shen, Lichuan Gu, Zhenzhen Wang, Ning Su, Kangle Niu, Wei Guo, Shaoli Hou, Xiaoming Bao, Chaoguang Tian, Xu Fangd-Xylose is the most abundant
hemicellulosic monomer on
earth, but wild-type Saccharomyces cerevisiae has very limited d-xylose uptake capacity. We conducted
bioprospecting for new sugar transporters from the d-xylose-consuming
filamentous fungus Trichoderma reesei and identified three candidates belonging to the major facilitator
superfamily. When they were expressed in yeast and assayed for d-xylose uptake, one of them, Xltr1p, had d-xylose
transport activity that was more efficient than that of Gal2p, an
endogenous yeast transporter. Site-directed mutagenesis was used to
examine the functional contributions of 13 amino acid residues for
the uptake of d-xylose, and these experiments identified
particular amino acids that function distinctly in d-xylose
vs glucose transport (e.g., F300). Excitingly, the yeast strain expressing
the N326FXltr1p variant was able to carry a “high
efficiency” transport for d-xylose but was nearly
unable to utilize glucose; in contrast, the strain with the F300AXltr1p variant grew on glucose but lost d-xylose transport
activity.
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yeast transporterd-xylose transport activityyeast strainGal 2pacid residueshemicellulosic monomerF 300A Xltr 1p variantd-xylose uptake capacityd-xylose-consuming filamentous fungus Trichoderma reeseisugar transportersN 326F Xltr 1p variantd-xylose uptaked-xylose vs glucose transportSite-directed mutagenesisXltr 1pfacilitator superfamilySaccharomyces cerevisiae d-Xylosewild-type Saccharomyces cerevisiae
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