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. 1994 Feb;176(4):953–958. doi: 10.1128/jb.176.4.953-958.1994

Affinity of glucose transport in Saccharomyces cerevisiae is modulated during growth on glucose.

M C Walsh 1, H P Smits 1, M Scholte 1, K van Dam 1
PMCID: PMC205144  PMID: 8106337

Abstract

By using a modified technique to measure glucose uptake in Saccharomyces cerevisiae, potential uncertainties have been identified in previous determinations. These previous determinations had led to the proposal that S. cerevisiae contained a constitutive low-affinity glucose transporter and a glucose-repressible high-affinity transporter. We show that, upon transition from glucose-repressed to -derepressed conditions, the maximum rate of glucose transport is constant and only the affinity for glucose changes. We conclude that the transporter or group of transporters is constitutive and that regulation of glucose transport occurs via a factor that modifies the affinity of the transporters and not via the synthesis of different kinetically independent transporters. Such a mechanism could, for instance, be accommodated by the binding of kinases causing a change in affinity for glucose.

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Selected References

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