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Identification of Aly1 and Aly2 as Modulators of Cytoplasmic pH in Saccharomyces cerevisiae .
Current Issues in Molecular Biology 2023 December 26
The regulation of intracellular pH in yeast ( Saccharomyces cerevisiae ) cells is critical for cell function and viability. In yeast, protons (H+ ) can be excreted from the cell by plasma membrane ATPase PMA1 and pumped into vacuoles by vacuolar H+ -ATPase. Because PMA1 is critical to the survival of yeast cells, it is unknown whether other compensatory components are involved in pH homeostasis in the absence of PMA1. To elucidate how intracellular pH is regulated independently of PMA1, we employed a screening approach by exposing the yeast haploid deletion mutant library (ver 4.0) to the selective plant plasma membrane H+ -ATPase inhibitor PS-1, which we previously reported. After repeated screenings and verification, we identified two proteins, Aly1 and Aly2 , that play a role in the regulation of intracellular pH when PMA1 is deficient. Our research uncovers a new perspective on the regulation of intracellular pH related to PMA1 and also preliminarily reveals a role for Aly1 and Aly2 in the regulation of intracellular pH.
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