The intracellular dissipation of cytosolic calcium following glucose re‐addition to carbohydrate depleted Saccharomyces cerevisiae

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Abstract
Glucose re-addition to carbohydrate starved yeast cells leads to a transient elevation of eytosolic calcium (TECC). Concomitantly, a cytosolic proton extrusion occurs through the activation of the vacuolar H+-ATPase and the plasma membrane H+-ATPases. This study addressed the dissipation of the TECC through intracellular compartmentalization and the possible affects of the H+-ATPases on this process. Both the vacuole and the Golgi-ER apparatus were found to play important roles in distributing calcium to internal stores. Additionally, the inhibition of cytosolic proton extrusion augmented cytosolic calcium responses. A model where pH dependent cytosolic calcium buffering plays an important role in the dissipation of the TECC in Saccharomyces cerevisiae is proposed