Characterization of two different types of UDP-glucose/-galactose 4-epimerase involved in galactosylation in fission yeast

Microbiology
Shotaro SuzukiNaotaka Tanaka

Abstract

Schizosaccharomyces species are currently the only known organisms with two types of genes encoding UDP-glucose/-galactose 4-epimerase, uge1(+) and gal10(+). A strain deleted for uge1(+) exhibited a severe galactosylation defect and a decrease in activity and in UDP-galactose content when grown in glucose-rich medium (2 % glucose), indicating that Uge1p is a major UDP-glucose/-galactose 4-epimerase under these growth conditions. In contrast, gal10(+) was efficiently expressed and involved in galactosylation of cell-surface proteins in low-glucose medium (0.1 % glucose and 2 % glycerol), but not in galactose-containing medium. In a uge1Deltagal10Delta strain, the galactosylation defect was suppressed and UDP-galactose content restored to wild-type levels in galactose-containing medium. Disruption of gal7(+), encoding galactose-1-phosphate uridylyltransferase, in the uge1Deltagal10Delta strain reversed suppression of the galactosylation defect and reduced levels of UDP-galactose, indicating that galactose is transported from the medium to the cytosol and is converted into UDP-galactose via galactose 1-phosphate by Gal7p in Sch. pombe.

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Citations

Dec 21, 2012·Applied Microbiology and Biotechnology·Tomohiko MatsuzawaKaoru Takegawa
Nov 27, 2015·Biotechnology for Biofuels·Zbigniew LazarJean-Marc Nicaud
May 19, 2011·PloS One·Kyle S Van Houtan, John M Halley
Aug 25, 2011·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Daniela BuchheitMatthias Bureik
Dec 16, 2021·Applied Microbiology and Biotechnology·Mari A PiirainenAlexander D Frey

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