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Δευτέρα 29 Ιανουαρίου 2018

Osmotolerance of Dekkera bruxellensis and the role of two Stl glycerol-proton symporters

Abstract
Dekkera bruxellensis is important for lambic beer fermentation, but is considered a spoilage yeast in wine fermentation. We compared two D. bruxellensis strains isolated from wine and found that they differ in some basic properties including osmotolerance. The genomes of both strains contain two highly similar copies of genes encoding putative glycerol-proton symporters from the STL family which are important for yeast osmotolerance. Cloning of the two DbSTL genes and their expression in suitable osmosensitive S. cerevisiae mutants revealed that both identified genes encode functional glycerol uptake systems, but only DbStl2 has the capacity to improve the osmotolerance of S. cerevisiae cells.

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