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M310793200v1
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Papers In Press, published online ahead of print December 18, 2003
J. Biol. Chem, 10.1074/jbc.M310793200
Submitted on October 1, 2003
Revised on November 28, 2003
Accepted on December 18, 2003

The type 1 phosphatase reg1p/Glc7p is required for the glucose-induced degradation of fructose-1,6-bisphosphatase in the vacuole

Dong-Ying Cui, C. Randell Brown, and Hui-Ling Chiang

Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA 17033

Corresponding Author: crb13{at}psu.edu

Protein phosphatases play an important role in vesicular trafficking and membrane fusion processes. The type 1 phosphatase Glc7p and its regulatory subunit Reg1p were identified as required components in the glucose-induced targeting of the key gluconeogenic enzyme fructose-1, 6-bisphosphatase (FBPase) to the vacuole for degradation. The interaction of Reg1p with Glc7p was important for the transport of FBPase from intermediate Vid vesicles to vacuoles. The glc7-T152K mutant strain exhibited a reduced Reg1p binding, along with defects in FBPase degradation and Vid vesicle trafficking to the vacuole. In this mutant, Vid vesicles were the most defective components, whereas the vacuole was also defective. Shp1p and Glc8p regulate Glc7p phosphatase activity and are required for FBPase degradation. In the delta shp1 and delta glc8 strains, Reg1p-Glc7p interaction was not affected, suggesting that phosphatase activity is also necessary for FBPase degradation. Similar to those seen in the glc7-T152K mutant, the delta shp1 and delta glc8 mutants exhibited severely defective Vid vesicles, but partially defective vacuoles. Taken together, our results suggest that Reg1p/Glc7p interaction and Glc7p phosphatase activity play a required role in the Vid vesicle to vacuole trafficking step along the FBPase degradation pathway.


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