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- W1993775249 abstract "The yeast Saccharomyces cerevisiae senses glucose through two transmembrane glucose sensors, Snf3 and Rgt2. Extracellular glucose causes these sensors to generate an intracellular signal that induces expression of HXT genes encoding glucose transporters by inhibiting the function of Rgt1, a transcriptional repressor of HXT genes. We present the following evidence that suggests that the glucose sensors are coupled to the membrane-associated protein kinase casein kinase I (Yck1). (i) Overexpression of Yck1 leads to constitutive HXT1 expression; (ii) Yck1 (or its paralogue Yck2) is required for glucose induction of HXT1 expression; (iii) Yck1 interacts with the Rgt2 glucose sensor; and (iv) attaching the C-terminal cytoplasmic tail of Rgt2 to Yck1 results in a constitutive glucose signal. The likely targets of Yck1 in this signal transduction pathway are Mth1 and Std1, which bind to and regulate function of the Rgt1 transcription factor and bind to the C-terminal cytoplasmic domain of glucose sensors. Potential casein kinase I phosphorylation sites in Mth1 and Std1 are required for normal glucose regulation of HXT1 expression, and Yck1 catalyzes phosphorylation of Mth1 and Std1 in vitro. These results support a model of glucose signaling in which glucose binding to the glucose sensors causes them to activate Yck1 in the cell membrane, which then phosphorylates Mth1 and Std1 bound to the cytoplasmic face of the glucose sensors, triggering their degradation and leading to the derepression of HXT gene expression. Our results add nutrient sensing to the growing list of processes in which casein kinase I is involved." @default.
- W1993775249 created "2016-06-24" @default.
- W1993775249 creator A5000757668 @default.
- W1993775249 creator A5042991989 @default.
- W1993775249 date "2004-01-30" @default.
- W1993775249 modified "2023-10-09" @default.
- W1993775249 title "Glucose sensing and signaling in <i>Saccharomyces cerevisiae</i> through the Rgt2 glucose sensor and casein kinase I" @default.
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- W1993775249 doi "https://doi.org/10.1073/pnas.0305901101" @default.
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