Cohesin's Smc1 and Smc3 subunits form V-shaped heterodimers, the nucleotide binding domains (NBDs) of which bind the C- and N-terminal domains, respectively, of the α-kleisin subunit, forming a large tripartite ring within in which sister DNAs are entrapped, and thereby held together (sister chromatid cohesion). During replication, establishment of stable cohesion is dependent on Eco1-mediated acetylation of Smc3's NBD, which is thought to prevent dissociation of α-kleisin from Smc3, thereby locking shut a "DNA exit gate." How Scc3 and Pds5, regulatory subunits bound to α-kleisin, regulate cohesion establishment and maintenance is poorly understood. We show here that by binding to α-kleisin adjacent to its Smc3 nucleotide binding N-terminal domain, Pds5 not only promotes cohesin's release from chromatin but also mediates de novo acetylation of Smc3 by Eco1 during S phase and subsequently prevents de-acetylation by the deacetylase Hos1/HDAC8. By first promoting cohesin's release from chromosomes and subsequently creating and guarding the chemical modification responsible for blocking release, Pds5 enables chromosomal cohesin to switch during S phase from a state of high turnover to one capable of tenaciously holding sister chromatids together for extended periods of time, a duality that has hitherto complicated analysis of this versatile cohesin subunit.
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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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Evidence ID | Analyze ID | File | Description |
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