We report the functional characterization of RPN6, an essential gene from Saccharomyces cerevisiae encoding the proteasomal subunit Rpn6p. For this purpose, conditional mutants that are able to grow on galactose but not on glucose were obtained. When these mutants are shifted to glucose, Rpn6p depletion induces several specific phenotypes. First, multiubiquitinated proteins accumulate, indicating a defect in proteasome-mediated proteolysis. Second, mutant yeasts are arrested as large budded cells with a single nucleus and a 2C DNA content; in addition, the spindle pole body is duplicated, indicating a general cell cycle defect related to the turnover of G(2)-cyclins after DNA synthesis. Clb2p and Pds1p, but not Sic1p, accumulate in the arrested cells. Depletion of Rpn6p affects both the structure and the peptidase activity of proteasomes in the cell. These results implicate Rpn6p function in the specific recognition of a subset of substrates and point to a role in maintaining the correct quaternary structure of the 26 S proteasome.
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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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