In Saccharomyces cerevisiae, the cyclin-dependent kinase Bur1 is primarily known for its role in promoting transcription elongation, thereby regulating gene expression. In this study, we investigated the genetic interactions between a hypomorphic BUR1 allele (bur1-107) and null mutants of the checkpoint kinases Mec1 and Rad53. Remarkably, bur1-107 alleviated the sensitivity of mec1 and rad53 mutants to hydroxyurea (HU), suggesting that Bur1 activity becomes detrimental when checkpoint signaling is impaired. Furthermore, the bur1-107 mutation delayed the G1-to-S phase transition, implicating Bur1 as a key player in cell cycle progression. In HU-treated mec1 mutants, bur1-107 reduced γ-H2A accumulation, promoted S-phase resumption, and suppressed the formation of sub-G1 populations. Together, these findings suggest that Bur1-driven G1-to-S phase progression exacerbates DNA damage and cell death in checkpoint-deficient cells exposed to HU. This study highlights a novel role for Bur1 in modulating the cellular response to replication stress in checkpoint-compromised cells.
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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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