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Mol Cell Biol, June 1998, p. 3289-3299, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Cyclin Partners Determine Pho85 Protein Kinase
Substrate Specificity In Vitro and In Vivo: Control of Glycogen
Biosynthesis by Pcl8 and Pcl10
Dongqing
Huang,1,
Jason
Moffat,2
Wayne A.
Wilson,1
Lynda
Moore,2
Christine
Cheng,1
Peter J.
Roach,1,* and
Brenda
Andrews2
Department of Biochemistry and Molecular
Biology, Indiana University School of Medicine, Indianapolis, Indiana
46202-5122,1 and
Department of Molecular
and Medical Genetics, University of Toronto, Toronto,
Canada2
Received 7 January 1998/Returned for modification 16 February
1998/Accepted 18 March 1998
In Saccharomyces cerevisiae, PHO85 encodes
a cyclin-dependent protein kinase (Cdk) with multiple roles in cell
cycle and metabolic controls. In association with the cyclin Pho80,
Pho85 controls acid phosphatase gene expression through phosphorylation
of the transcription factor Pho4. Pho85 has also been implicated as a kinase that phosphorylates and negatively regulates glycogen synthase (Gsy2), and deletion of PHO85 causes glycogen
overaccumulation. We report that the Pcl8/Pcl10 subgroup of cyclins
directs Pho85 to phosphorylate glycogen synthase both in vivo and in
vitro. Disruption of PCL8 and PCL10 caused
hyperaccumulation of glycogen, activation of glycogen synthase, and a
reduction in glycogen synthase kinase activity in vivo. However, unlike
pho85 mutants, pcl8 pcl10 cells had normal
morphologies, grew on glycerol, and showed proper regulation of acid
phosphatase gene expression. In vitro, Pho80-Pho85 complexes
effectively phosphorylated Pho4 but had much lower activity toward
Gsy2. In contrast, Pcl10-Pho85 complexes phosphorylated Gsy2 at Ser-654
and Thr-667, two physiologically relevant sites, but only poorly
phosphorylated Pho4. Thus, both the in vitro and in vivo substrate
specificity of Pho85 is determined by the cyclin partner. Mutation of
PHO85 suppressed the glycogen storage deficiency of
snf1 or glc7-1 mutants in which glycogen
synthase is locked in an inactive state. Deletion of PCL8
and PCL10 corrected the deficit in glycogen synthase
activity in both the snf1 and glc7-1 mutants,
but glycogen synthesis was restored only in the glc7-1 mutant strain. This genetic result suggests an additional role for
Pho85 in the negative regulation of glycogen accumulation that is
independent of Pcl8 and Pcl10.
*
Corresponding author. Mailing address: Department of
Biochemistry and Molecular Biology, Indiana University School of
Medicine, 635 Barnhill Dr., Indianapolis, IN 46202-5122. Phone: (317)
274-1582. Fax: (317) 274-4686. E-mail: proach{at}iupvi.edu.

Present address: Department of Molecular and Medical Genetics,
University of Toronto, Toronto, Canada.
Mol Cell Biol, June 1998, p. 3289-3299, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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