Enzyme specificity in vivo is often controlled by subcellular localization. Yeast Doa4, a deubiquitylating enzyme (DUB), removes ubiquitin from membrane proteins destined for vacuolar degradation. Doa4 is recruited to the late endosome after ESCRT-III (endosomal sorting complex required for transport III) has assembled there. We show that an N-terminal segment of Doa4 is sufficient for endosome association. This domain bears four conserved elements (boxes A-D). Deletion of the most conserved of these, A or B, prevents Doa4 endosomal localization. These mutants cannot sustain ubiquitin-dependent proteolysis even though neither motif is essential for deubiquitylating activity. Ubiquitin-specific processing protease 5 (Ubp5), the closest paralogue of Doa4, has no functional overlap. Ubp5 concentrates at the bud neck; its N-terminal domain is critical for this. Importantly, substitution of the Ubp5 N-terminal domain with that of Doa4 relocalizes the Ubp5 enzyme to endosomes and provides Doa4 function. This is the first demonstration of a physiologically important DUB subcellular localization signal and provides a striking example of the functional diversification of DUB paralogues by the evolution of alternative spatial signals.
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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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Evidence ID | Analyze ID | File | Description |
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