In proliferating S. cerevisiae, genes whose products function in DNA replication are regulated by the MBF transcription factor composed of Mbp1 and Swi6 that binds to consensus MCB sequences in target promoters. We find that during meiotic development a subset of DNA replication genes exemplified by TMP1 and RNR1 are regulated by Mbp1. Deletion of Mbp1 deregulated TMP1 and RNR1 but did not interfere with premeiotic S-phase, meiotic recombination, or spore formation. Surprisingly, deletion of MBP1 had no effect on the expression of CLB5, which is purportedly controlled by MBF. Extensive analysis of the CLB5 promoter revealed that the gene is largely regulated by elements within a 100-bp fragment containing a cluster of MCB sequences. Surprisingly, induction of the CLB5 promoter requires MCB sequences, but not Mbp1, implying that another MCB-binding factor may exist in cells undergoing meiosis. In addition, full activation of CLB5 during meiosis requires Clb5 activity, suggesting that CLB5 may be regulated by a positive feedback mechanism. We further demonstrate that during meiosis MCBs function as effective transcriptional activators independent of MBP1.
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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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