Abstract
One of the most recent functions assigned to the TOR signaling pathway in yeast is the coordination of the transcription of genes involved in nutrient utilization. Here we show that transcription of ENA1, a gene encoding a lithium and sodium ion transporter essential for salt tolerance in yeast, is controlled by the TOR signaling pathway. First, ENA1 expression is strongly induced under TOR-inactivating conditions. Second, the absence of the TOR-controlled GATA transcription factors GLN3 and GAT1 results in reduced basal and salt-induced expression of ENA1. Third, a gln3 gat1 mutant displays a pronounced sensitivity to high concentrations of lithium and sodium. Fourth, TOR1, similar to ENA1, is required for growth under saline stress conditions. In summary, our results suggest that TOR plays a role in the general response to saline stress by regulating the transcription of ENA1 via GLN3 and GAT1.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenosine Triphosphatases / genetics*
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Cation Transport Proteins*
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Cell Cycle Proteins
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DNA-Binding Proteins / physiology*
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Fungal Proteins / physiology*
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Phosphatidylinositol 3-Kinases*
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Phosphotransferases (Alcohol Group Acceptor) / physiology*
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RNA, Messenger / analysis
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Repressor Proteins*
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Saccharomyces cerevisiae / drug effects*
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Saccharomyces cerevisiae / metabolism
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Saccharomyces cerevisiae Proteins*
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Sodium Chloride / pharmacology*
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Sodium-Potassium-Exchanging ATPase
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Transcription Factors / physiology*
Substances
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Cation Transport Proteins
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Cell Cycle Proteins
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DNA-Binding Proteins
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ENA1 protein, S cerevisiae
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Fungal Proteins
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GLN3 protein, S cerevisiae
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RNA, Messenger
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Repressor Proteins
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Saccharomyces cerevisiae Proteins
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Transcription Factors
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Sodium Chloride
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Phosphotransferases (Alcohol Group Acceptor)
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TOR1 protein, S cerevisiae
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TOR2 protein, S cerevisiae
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Adenosine Triphosphatases
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Sodium-Potassium-Exchanging ATPase