Abstract
Ca2−/calmodulin-dependent phosphoprotein phosphatase (calcineurin, PP2B) of Saccharomyces cerevisiae is implicated in adaptation to high-salt conditions. Calcineurin mediates high salt-induced expression of the ENA1/PMR2 gene encoding the P-type ATPase, which is suggested to be involved in Na+ efflux. We identified the PDE1 gene encoding the low-affinity cAMP phosphodiesterase as a multicopy suppressor of the Li+- and Na+-sensitive calcineurin null mutant, suggesting that cAMP is a negative regulator of adaptation to high-salt stress. Genetic analysis indicated that calcineurin and cAMP act antagonistically in a common pathway for adaptation. The bcy1 disruption, which leads to constitutive cAMP-dependent protein kinase (PKA) activity, inhibited high NaCl-induced expression of the ENA1/PMR2 gene, caused an elevation of the intracellular Na+ level and a growth defect in high-NaCl medium, all of which were analogous to the defects of a calcineurin mutant. A reduced cAMP level resulting from multiple copies of the PDE1 gene caused increased expression of the ENA1/PMR2 gene in response to high NaCl. We propose a model for the regulation of cation homeostasis, in which calcineurin antagonizes PKA to activate transcription of the ENA1/PMR2 gene in response to high-salt conditions.
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Communicated by C. Hollenberg
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Hirata, D., Harada, Si., Namba, H. et al. Adaptation to high-salt stress in Saccharomyces cerevisiae is regulated by Ca2+/calmodulin-dependent phosphoprotein phosphatase (calcineurin) and cAMP-dependent protein kinase. Molec. Gen. Genet. 249, 257–264 (1995). https://doi.org/10.1007/BF00290525
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DOI: https://doi.org/10.1007/BF00290525