Characterization of sugar transport in 2-deoxy-D-glucose resistant mutants of yeast
1990
Novak, S. | D'Amore, T. | Russell, I. | Stewart, G.G.
A number of 2-deoxy-D-glucose (2-DOG) resistant mutants exhibiting resistance to glucose repression were isolated from various Saccharomyces yeast strains. Most of the mutants isolated were observed to have improved maltose uptake ability in the presence of glucose. Fermentation studies indicated that maltose was taken up at a faster rate and glucose taken up at a slower rate in the mutant strains compared to the parental strains, when these sugars were fermented together. When these sugars were fermented separately, only the 2-DOG resistant mutant obtained from Saccharomyces cerevisiae strain 1190 exhibited alterations in glucose and maltose uptake compared to the parental strain. Kinetic analysis of sugar transport employing radiolabelled glucose and maltose indicated that both glucose and maltose were transported with higher rates in the mutant strain. These results suggested that the high affinity glucose transport system was regulated by glucose repression in the parental strain but was derepressed in the mutant.
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