Chromatography of wild-type yeast extracts on DEAE-cellulose columns resolves two populations of glycogen synthase I (glucose-6-P-independent) and D (glucose-6-P-dependent) (Huang, K. P., Cabib, E. (1974) J. Biol. Chem. 249, 3851-3857). Extracts from a glycogen-deficient mutant strain, 22R1 (glc7), yielded only the D form of glycogen synthase. Glycogen synthase D purified from either wild-type yeast or from this glycogen-deficient mutant displayed two polypeptides with molecular masses of 76 and 83 kDa on sodium dodecyl sulfate-gel electrophoresis in a protein ratio of about 4:1. Phosphate analysis showed that glycogen synthase D from either strain of yeast contained approximately 3 phosphates/subunit. The 76- and 83-kDa bands of the mutant strain copurified through a variety of procedures including nondenaturing gel electrophoresis. These two polypeptides showed immunological cross-reactivity and similar peptide maps indicating that they are structurally related. The relative amounts of these two forms remained constant during purification and storage of the enzyme and after treatment with cAMP-dependent protein kinase or with protein phosphatases. The two polypeptides were phosphorylated to similar extent in vitro by the catalytic subunit of mammalian cyclic AMP-dependent protein kinase. Phosphorylation of the enzyme in the presence of labeled ATP followed by tryptic digestion and reversed phase high performance liquid chromatography yielded two labeled peptides from each of the 76- and 83-kDa subunits. Treatment of wild-type yeast with Li+ increased the glycogen synthase activity, measured in the absence of glucose-6-P, by approximately 2-fold, whereas similar treatment of the glc7 mutant had no effect. The results of this study indicate that the GLC7 gene is involved in a pathway that regulates the phosphorylation state of glycogen synthase.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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