, Volume 45, Issue 11–12, pp 1018–1023 | Cite as

Kinetic analysis and simulation of glucose transport in plasma membrane vesicles of glucose-repressed and derepressedSaccharomyces cerevisiae cells

  • G. F. Fuhrmann
  • B. Völker
  • S. Sander
  • M. Potthast
Multi-Author Review


In this study experimental data on the kinetic parameters investigated by other authors1–5, 11 together with own data on plasma membrane vesicles, have been subjected to a computer simulation based on the equations describing facilitated diffusion. The simulation led to an ideal fit describing the above data. From this it can be concluded that glucose is transported by facilitated diffusion, and not by active transport as was postulated by Van Steveninck14, 15.

The simulation method also demonstrates that the fast sampling technique used by these authors1–5,11 underestimates the fluxes. Thus, the parameters given do not contribute to the understanding of glucose transport under different metabolic conditions.

The K value of plasma membrane vesicles prepared from glucose-repressed cells is around 7 mM. Derepression, particularly by galactose, causes a highly significant increase in affinity as shown by a decrease in the K value to 2 mM. The highest affinity was measured in a triple kinaseless mutant grown on glycerol with a K value of 1 mM. If seems, therefore, that the kinetic parameters derived from initial uptake rates of glucose in intact cells1–5,11 using single flux analysis, such as Eadie-Hofstee- or Lineweaver-Burk-plots, are in error.

Key words

Saccharomyces cerevisiae growth conditions kinaseless mutant plasma membrane vesicles glucose transport kinetics and computer simulation 


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Copyright information

© Birkhäuser Verlag 1989

Authors and Affiliations

  • G. F. Fuhrmann
    • 1
  • B. Völker
    • 1
  • S. Sander
    • 1
  • M. Potthast
    • 1
  1. 1.Department of Pharmacology and ToxicologyPhilipps-Universität MarburgMarburgGermany

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