The Candida albicans cyclin CaPcl5 activates the cyclin-dependent kinase Pho85 and induces phosphorylation of the transcription factor CaGcn4, leading to its degradation. The high substrate specificity of the CaPcl5/Pho85 complex provides the opportunity to study the determinants of substrate selectivity of cyclins. Mutational analysis of CaPcl5 suggests that residues in a predicted α-helix at the N-terminal end of the cyclin box, as well as in helix I of the cyclin box, play a role in specific substrate recognition. Similar to Saccharomyces cerevisiae Pcl5, we show here that CaPcl5 induces its own phosphorylation at two adjacent sites in the N-terminal region of the protein and that this phosphorylation causes degradation of the cyclin in vivo via the SCF(CDC4) ubiquitin ligase. Remarkably, however, in vitro studies reveal that this phosphorylation also results in a loss of specific substrate recognition, thereby providing an additional novel mechanism for limiting cyclin activity.
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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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