The PKC1 gene of Saccharomyces cerevisiae encodes a homolog of mammalian protein kinase C that is required for yeast cell growth. Loss of PKC1 function results in cell lysis due to an inability to remodel the cell wall properly during growth. The PKC1 gene has been proposed to regulate a bifurcated pathway, on one branch of which function four putative protein kinases that catalyze a linear cascade of protein phosphorylation culminating in the activation of the mitogen-activated protein kinase homolog, Mpk1p. Here we describe two genes whose overexpression suppress both an mpk1 delta mutation and a pkc1 delta mutation. One of these genes is identical to the previously identified PPZ2 gene. The PPZ2 gene is predicted to encode a type 1-related protein phosphatase and is functionally redundant with a closely related gene, designated PPZ1. Deletion of both PPZ1 and PPZ2 resulted in a temperature-dependent cell lysis defect similar to that observed for bck1 delta, mkk1,2 delta, or mpk1 delta mutants. However, ppz1,2 delta mpk1 delta triple mutants displayed a cell lysis defect at all temperatures. The additivity of the ppz1,2 delta defect with the mpk1 delta defect, combined with the results of genetic epistasis experiments, suggested either that the PPZ1- and PPZ2-encoded protein phosphatases function on a branch of the PKC1-mediated pathway different from that defined by the protein kinases or that they play an auxiliary role in the pathway. The other suppressor gene, designated BCK2 (for bypass of C kinase), is predicted to encode a 92-kDa protein that is rich in serine and threonine residues. Genetic interactions between BCK2 and other pathway components suggested that BCK2 functions on a common pathway branch with PPZ1 and PPZ2.
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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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