Glycolytic oscillations and intracellular K+ concentration are strongly coupled in the yeast Saccharomyces cerevisiae

Lars F. Olsen, Roberto P. Stock, L. A. Bagatolli*

*Corresponding author for this work

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Abstract

We measured temporal oscillations of intracellular K+ concentration in yeast cells exhibiting glycolytic oscillations using fluorescence spectroscopy and microscopy methods. These oscillations showed the same period as those of glycolytic metabolites (NADH, ATP), indicating a strong coupling between them. We experimentally ruled out that oscillations originate in extra- or intracellular K+ fluxes and conclude that these oscillations arise from fluctuations in free and adsorbed states of K+ in the cell interior. Oscillations in K+ showed a strong dependence on ATP and the organization of the cell cytoskeleton. Our results challenge the widely held view that intracellular K+ predominantly exists in a free state. They can, however, be productively understood in terms of Gilbert Ling's Association-Induction hypothesis.

Original languageEnglish
Article number108257
JournalArchives of Biochemistry and Biophysics
Volume681
Number of pages8
ISSN0003-9861
DOIs
Publication statusPublished - 15. Mar 2020

Keywords

  • Association-induction hypothesis
  • Glycolytic oscillations
  • Intracellular potassium concentration
  • PBFI fluorescence
  • Yeast cytosol

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