Nutrient starvation and inactivation of target of rapamycin complex 1 (TORC1) protein kinase induce nucleophagy preferentially degrading only nucleolar components in budding yeast. Nucleolar proteins are relocated to sites proximal to the nucleus-vacuole junction (NVJ), where micronucleophagy occurs, whereas rDNA, which is embedded in the nucleolus under normal conditions, moves to NVJ-distal regions, causing rDNA dissociation from nucleolar proteins after TORC1 inactivation. This repositioning is mediated via chromosome linkage INM protein (CLIP)-cohibin complexes that tether rDNA to the inner nuclear membrane. Here, we show that TORC1 inactivation-induced rDNA condensation promotes the repositioning of rDNA and nucleolar proteins. Defects in condensin, Rpd3-Sin3 histone deacetylase (HDAC), and high-mobility group protein 1 (Hmo1), which are involved in TORC1 inactivation-induced rDNA condensation, compromised the repositioning and nucleophagic degradation of nucleolar proteins, although rDNA still escaped from nucleophagic degradation in these mutants. We propose a model in which rDNA condensation after TORC1 inactivation generates a motive force for the repositioning of rDNA and nucleolar proteins.
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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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