The anaphase-promoting complex/cyclosome (APC) is a highly conserved ubiquitin ligase that controls passage through the cell cycle by targeting many proteins for proteolysis. The complex is composed of at least thirteen core subunits, eight of which are essential, and two activating subunits, Cdc20 (essential) and Cdh1/Hct1 (non-essential). Previously, it was not known which APC targets are sufficient to explain the essential nature of the complex. Here, we show that each of the eight normally essential APC subunits is rendered non-essential ('bypass-suppressed') by the simultaneous removal/inhibition of the APC substrates securin (Pds1) and B-type cyclin/CDK (Clb/CDK). In strains lacking the APC, levels of Clb2 and Clb3 remain constant, but Clb/CDK activity oscillates as cells cycle. This suggests that in the absence of B-type cyclin destruction, oscillation of the Clb/CDK-inhibitor Sic1 is sufficient to trigger the feedback loops necessary for the bi-stable nature of Clb/CDK activity. These results strongly suggest that securin and B-type cyclin/CDK activity are the only obligatory targets of the APC in Saccharomyces cerevisiae.
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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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