The Saccharomyces cerevisiae Snf1 protein kinase, a member of the Snf1/AMPK (AMP-activated protein kinase) family, has important roles in metabolic control, particularly in response to nutrient stress. Here we have addressed the role of Snf1 in responses to other environmental stresses. Exposure of cells to sodium ion stress, alkaline pH, or oxidative stress caused an increase in Snf1 catalytic activity and phosphorylation of Thr-210 in the activation loop, whereas treatment with sorbitol or heat shock did not. Inhibition of respiratory metabolism by addition of antimycin A to cells also increased Snf1 activity. Analysis of mutants indicated that the kinases Sak1, Tos3, and Elm1, which activate Snf1 in response to glucose limitation, are also required under other stress conditions. Each kinase sufficed for activation in response to stress, but Sak1 had the major role. In sak1Delta tos3Delta elm1Delta cells expressing mammalian Ca(2+)/calmodulin-dependent protein kinase kinase alpha, Snf1 was activated by both sodium ion and alkaline stress, suggesting that stress signals regulate Snf1 activity by a mechanism that is independent of the upstream kinase. Finally, we showed that Snf1 protein kinase is regulated differently during adaptation of cells to NaCl and alkaline pH with respect to both temporal regulation of activation and subcellular localization. Snf1 protein kinase becomes enriched in the nucleus in response to alkaline pH but not salt stress. Such differences could contribute to specificity of the stress responses.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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