The yeast KEX1 gene product has homology to yeast carboxypeptidase Y. A mutant replacing serine at the putative active site of the KEX1 protein abolished activity in vivo. A probable site of processing by the KEX1 product is the C-terminus of the alpha-subunit of killer toxin, where toxin is followed in the precursor by 2 basic residues. Processing involves endoproteolysis following these basic residues and trimming of their C-terminal by a carboxypeptidase. Consistent with the KEX1 product being this carboxypeptidase is its role in alpha-factor pheromone production. In wild-type yeast, KEX1 is not essential for alpha-factor production, as the final pheromone repeat needs no C-terminal processing. However, in a mutant in which alpha-factor production requires a carboxypeptidase, pheromone production is KEX1-dependent.
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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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