Cyclin degradation is central to regulation of the cell cycle. Mitotic exit was proposed to require degradation of the S phase cyclin Clb5 by the anaphase-promoting complex activated by Cdc20 (APC(Cdc20)). Furthermore, Clb5 degradation was thought to be necessary for effective dephosphorylation and activation of the APC regulatory subunit Cdh1 (also known as Hct1) and the cyclin-dependent kinase inhibitor Sic1 by the phosphatase Cdc14, allowing mitotic kinase inactivation and mitotic exit. Here we show, however, that spindle disassembly and cell division occur without significant APC(Cdc20)-mediated Clb5 degradation, as well as in the absence of both Cdh1 and Sic1. We find instead that destruction-box-dependent degradation of the mitotic cyclin Clb2 is essential for mitotic exit. APC(Cdc20) may be required for an essential early phase of Clb2 degradation, and this phase may be sufficient for most aspects of mitotic exit. Cdh1 and Sic1 may be required for further inactivation of Clb2-Cdk1, regulating cell size and the length of G1.
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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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