Mec1 [ATR (ataxia telangiectasia mutated- and Rad3-related) in humans] is the principle kinase responsible for checkpoint activation in response to replication stress and DNA damage in Saccharomyces cerevisiae. The heterotrimeric checkpoint clamp, 9-1-1 (checkpoint clamp of Rad9, Rad1 and Hus1 in humans and Ddc1, Rad17 and Mec3 in S. cerevisiae; Ddc1-Mec3-Rad17) and the DNA replication initiation factor Dpb11 (human TopBP1) are the two known activators of Mec1. The 9-1-1 clamp functions in checkpoint activation in G1- and G2-phase, but its employment differs between these two phases of the cell cycle. The Ddc1 (human Rad9) subunit of the clamp directly activates Mec1 in G1-phase, an activity identified only in S. cerevisiae so far. However, in G2-phase, the 9-1-1 clamp activates the checkpoint by two mechanisms. One mechanism includes direct activation of Mec1 by the unstructured C-terminal tail of Ddc1. The second mech-anism involves the recruitment of Dpb11 by the phosphorylated C-terminal tail of Ddc1. The latter mechanism is highly conserved and also functions in response to replication stress in higher eukaryotes. In S. cerevisiae, however, both the 9-1-1 clamp and the Dpb11 are partially redundant for checkpoint activation in response to replication stress, suggesting the existence of additional activators of Mec1.
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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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