The mitogen-activated protein kinase cascade of the Saccharomyces cerevisiae pheromone response pathway is organized on the Ste5 protein, which binds each of the kinases of the cascade prior to signaling. In this study, a structure-function analysis of Ste5 deletion mutants uncovered new functional domains of the Ste5 protein and revealed that Ste5 dimerizes during the course of normal signal transduction. Dimerization, mediated by two regions in the N-terminal half of Ste5, was first suggested by intragenic complementation between pairs of nonfunctional Ste5 mutants and was confirmed by using the two-hybrid system. Coimmunoprecipitation of differently tagged forms of Ste5 from cells in which the pathway has been activated by Ste5 overexpression further confirmed dimerization. A precise correlation between the biological activity of various Ste5 fragments and dimerization suggests that dimerization is essential for Ste5 function.
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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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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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