The Smc5/6 complex belongs to the SMC (structural maintenance of chromosomes) family, which also includes cohesin and condensin. In Saccharomyces cerevisiae, the Smc5/6 complex contains six essential non-Smc elements, Nse1-6. Very little is known about how these additional elements contribute to complex function except for Nse2/Mms21, which is an E3 small ubiquitin-like modifier (SUMO) ligase important for Smc5 sumoylation. Characterization of two temperature-sensitive mutants, nse5-ts1 and nse5-ts2, demonstrated the importance of Nse5 within the Smc5/6 complex for its stability and functionality at forks during hydroxyurea-induced replication stress. Both NSE5 alleles showed a marked reduction in Smc5 sumoylation to levels lower than those observed with mms21-11, a mutant of Mms21 that is deficient in SUMO ligase activity. However, a phenotypic comparison of nse5-ts1 and nse5-ts2 revealed a separation of importance between Smc5 sumoylation and the function of the Smc5/6 complex during replication. Only cells carrying the nse5-ts1 allele exhibited defects such as dissociation of the replisome from stalled forks, formation of fork-associated homologous recombination intermediates, and hydroxyurea sensitivity that is additive with mms21-11. These defects are attributed to a failure in Smc5/6 localization to forks in nse5-ts1 cells. Overall, these data support the premise that Nse5 is important for vital interactions between components within the Smc5/6 complex, and for its functionality during replication stress.
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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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