At a point in late G1 termed Start, yeast cells enter S phase, duplicate their spindle pole bodies, and form buds. These events require activation of Cdc28 kinase by G1 cyclins. Swi4 associates with Swi6 to form the SCB-binding factor complex which activates G1 cyclin genes CLN1 and CLN2 in late G1. In G2 and M phases, the transcriptional activity of SCB-binding factor is repressed by the mitotic Clb2/Cdc28 kinase. Mbp1, a transcription factor related to Swi4, forms the MCB-binding factor complex with Swi6, which activates DNA synthesis genes and S-phase cyclin genes CLB5 and CLB6 in late G1. Clb2/Cdc28 kinase is not required for the repression of MCB-binding factor transcriptional activity in G2 and M phase. We show here that the Swi4 carboxy terminus is sufficient for interaction with Swi6 in vitro. A carboxy-terminal domain of Swi6 is required and sufficient for interaction with Swi4. The carboxy terminus of Mbp1 is sufficient for interaction with Swi6, and the carboxy terminus of Swi6 is required for interaction with Mbp1. By coimmunoprecipitation, we show that Swi4 but not Mbp1 interacts with Clb2/Cdc28 kinase in vivo during the G2 and M phases of the cell cycle. We demonstrate that the ankyrin repeats of Swi4 mediate the interaction with Clb2/Cdc28 kinase. The ankyrin repeats constitute a domain by which a cell cycle-specific transcription factor can interact with cyclin-dependent kinase complexes, thus enabling it to link its transcriptional activity to cell cycle progression.
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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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