The proteasome-interacting protein Rad23 is a long-lived protein. Interaction between Rad23 and the proteasome is required for Rad23's functions in nucleotide excision repair and ubiquitin-dependent degradation. Here, we show that the ubiquitin-associated (UBA)-2 domain of yeast Rad23 is a cis-acting, transferable stabilization signal that protects Rad23 from proteasomal degradation. Disruption of the UBA2 domain converts Rad23 into a short-lived protein that is targeted for degradation through its N-terminal ubiquitin-like domain. UBA2-dependent stabilization is required for Rad23 function because a yeast strain expressing a mutant Rad23 that lacks a functional UBA2 domain shows increased sensitivity to UV light and, in the absence of Rpn10, severe growth defects. The C-terminal UBA domains of Dsk2, Ddi1, Ede1, and the human Rad23 homolog hHR23A have similar protective activities. Thus, the UBA2 domain of Rad23 is an evolutionarily conserved stabilization signal that allows Rad23 to interact with the proteasome without facing destruction.
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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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