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Vol. 14, Issue 8, 3230-3241, August 2003
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Departments of Cell Biology and Molecular Biology, The Scripps Research Institute, La Jolla, California 92037
Submitted March 6, 2003;
Revised April 9, 2003;
Accepted April 9, 2003
Monitoring Editor: Mark Solomon
In budding yeast, HXT genes encoding hexose permeases are induced by glucose via a mechanism in which the F box protein Grr1 antagonizes activity of the transcriptional repressor Rgt1. Neither the mechanism of Rgt1 inactivation nor the role of Grr1 in that process has been understood. We show that glucose promotes phosphorylation of Rgt1 and its dissociation from HXT gene promoters. This cascade of events is dependent upon the F-box protein Grr1. Inactivation of Rgt1 is sufficient to explain the requirement for Grr1 but does not involve Rgt1 proteolysis or ubiquitination. We show that inactivation of Mth1 and Std1, known negative regulators of HXT gene expression, leads to the hyperphosphorylation of Rgt1 and its dissociation from HXT promoters even in the absence of glucose. Furthermore, inactivation of Mth1 and Std1 bypasses the requirement for Grr1 for induction of these events, suggesting they are targets for inactivation by Grr1. Consistent with that proposal, Mth1 is rapidly eliminated in response to glucose via a mechanism that requires Grr1. Based upon these data, we propose that glucose acts via Grr1 to promote the degradation of Mth1. Degradation of Mth1 leads to phosphorylation and dissociation of Rgt1 from HXT promoters, thereby activating HXT gene expression.
* Present address: Department of Biological Chemistry, University of California, Irvine, Irvine, CA 92697
Present address: Department of Radiology, The Ohio State University,
Columbus, OH 43210
Present address: Department of Ophthalmology, University of Minnesota,
Minneapolis, MN 55455.
Corresponding author. E-mail address:
curtw{at}scripps.edu.
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