| Conditions with high intracellular glucose inhibit sensing through glucose sensor Snf3 in Saccharomyces cerevisiae. | |
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MedLine Citation:
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PMID: 20564191 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Kaisa Karhumaa; Boqian Wu; Morten C Kielland-Brandt |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cellular biochemistry Volume: 110 ISSN: 1097-4644 ISO Abbreviation: J. Cell. Biochem. Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-06-30 Completed Date: 2010-11-01 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8205768 Medline TA: J Cell Biochem Country: United States |
Other Details:
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Languages: eng Pagination: 920-5 Citation Subset: IM |
Copyright Information:
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J. Cell. Biochem. 110: 920-925, 2010. (c) 2010 Wiley-Liss, Inc. |
Affiliation:
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Carlsberg Laboratory, DK-2500 Valby, Denmark. kka@bio.dtu.dk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Culture Media Glucose / metabolism* Monosaccharide Transport Proteins / metabolism* Saccharomyces cerevisiae / metabolism* Saccharomyces cerevisiae Proteins / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Culture Media; 0/Monosaccharide Transport Proteins; 0/SNF3 protein, S cerevisiae; 0/Saccharomyces cerevisiae Proteins; 50-99-7/Glucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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