Potassium Starvation in Yeast: Mechanisms of Homeostasis Revealed by Mathematical Modeling
Figure 5
Proposed mechanism of potassium homeostasis.
Changes of the external potassium concentration are sensed by an unidentified sensor system either directly or indirectly, e.g, via the membrane potential, internal potassium or pH changes. The sensor signal triggers a modulation of proton fluxes using the bicarbonate reaction system and the Pma1 proton pump as regulators.