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ATP-dependent chromatin remodeling complexes alter chromatin structure through interactions with chromatin substrates such as DNA, histones, and nucleosomes. However, whether chromatin remodeling complexes have the ability to regulate nonchromatin substrates remains unclear. Saccharomyces cerevisiae checkpoint kinase Mec1 (ATR in mammals) is an essential master regulator of genomic integrity. Here we found that the SWI/SNF chromatin remodeling complex is capable of regulating Mec1 kinase activity. In vivo, Mec1 activity is reduced by the deletion of Snf2, the core ATPase subunit of the SWI/SNF complex. SWI/SNF interacts with Mec1, and cross-linking studies revealed that the Snf2 ATPase is the main interaction partner for Mec1. In vitro, SWI/SNF can activate Mec1 kinase activity in the absence of chromatin or known activators such as Dpb11. The subunit requirement of SWI/SNF-mediated Mec1 regulation differs from that of SWI/SNF-mediated chromatin remodeling. Functionally, SWI/SNF-mediated Mec1 regulation specifically occurs in S phase of the cell cycle. Together, these findings identify a novel regulator of Mec1 kinase activity and suggest that ATP-dependent chromatin remodeling complexes can regulate nonchromatin substrates such as a checkpoint kinase.
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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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