The phosphoprotein phosphatase 1 (PP1) catalytic subunit encoded by the Saccharomyces GLC7 gene is involved in control of glycogen metabolism, meiosis, translation, chromosome segregation, cell polarity, and G2/M cell cycle progression. It is also lethal when overproduced. We have isolated strains which are resistant to Glc7p overproduction lethality as a result of mutations in the SHP1 (suppressor of high-copy PP1) gene, which was previously encountered in a genomic sequencing project as an open reading frame whose interruption totally blocked sporulation and slightly slowed cell proliferation. These phenotypes also characterized our shp1 mutations, as did deficient glycogen accumulation. Lysates from the shp1 mutants were deficient in PP1 catalytic activity but exhibited no obvious abnormalities in the steady-state level or subcellular localization pattern of a catalytically active Glc7p-hemagglutinin fusion polypeptide. The lower level of PP1 activity in shp1 cells permitted substitution of a galactose-induced GAL10-GLC7 fusion for GLC7; depletion of Glc7p from these cells by growth in glucose medium resulted in G2/M arrest as previously observed for a glc7cs allele but with depletion arrest occurring most frequently at a later stage of mitosis. The higher requirement of glycogen accumulation and sporulation for PP1 activity would permit their regulation via Glc7p activity, independent of its requirement for mitosis.
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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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