Conditions With High Intracellular Glucose Inhibit Sensing Through Glucose Sensor Snf3 in Saccharomyces cerevisiae

Kaisa Karhumaa, B.Q. Wu, Morten Kielland-Brandt

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Gene expression in micro-organisms is regulated according to extracellular conditions and nutrient concentrations. In Saccharomyces cerevisiae, non-transporting sensors with high sequence similarity to transporters, that is, transporter-like sensors, have been identified for sugars as well as for amino acids. An alternating-access model of the function of transporter-like sensors has been previously suggested based on amino acid sensing, where intracellular ligand inhibits binding of extracellular ligand. Here we studied the effect of intracellular glucose on sensing of extracellular glucose through the transporter-like sensor Snf3 in yeast. Sensing through Snf3 was determined by measuring degradation of Mth1 protein. High intracellular glucose concentrations were achieved by using yeast strains lacking monohexose transporters which were grown on maltose. The apparent affinity of extracellular glucose to Snf3 was measured for cells grown in non-fermentative medium or on maltose. The apparent affinity for glucose was lowest when the intracellular glucose concentration was high. The results conform to an alternating-access model for transporter-like sensors. J. Cell. Biochem. 110: 920-925, 2010.
    Original languageEnglish
    JournalJournal of Cellular Biochemistry
    Volume110
    Issue number4
    Pages (from-to)920-925
    ISSN0730-2312
    DOIs
    Publication statusPublished - 2010

    Keywords

    • MALTOSE
    • TRANSPORTER-LIKE SENSOR
    • GLUCOSE SENSING
    • REGULATION
    • YEAST

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