The mating-factor response pathway of Saccharomyces cerevisiae employs a set of protein kinase similar to kinases that function in signal transduction pathways of metazoans. We have purified the yeast protein kinases encoded by STE11, STE7, and FUS3 as fusions to glutathione S-transferase (GST) and reconstituted a kinase cascade in which STE11 phosphorylates and activates STE7, which in turn phosphorylates the mitogen-activated protein kinase FUS3. GST-STE11 is active even when purified from cells that have not been treated with alpha-factor. This observation raises the possibility that STE11 activity is governed by an inhibitor which is regulated by pheromone. We also identify a STE11-dependent phosphorylation site in STE7 which is required for activity of STE7. Conservation of this site in the mammalian STE7 homologue MEK and other STE7 relatives suggests that this may be a regulatory phosphorylation site in all MAP kinase kinases.
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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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