The structural maintenance of chromosomes (SMC) family of proteins play essential roles in genomic stability. SMC heterodimers are required for sister-chromatid cohesion (Cohesin: Smc1 & Smc3), chromatin condensation (Condensin: Smc2 & Smc4), and DNA repair (Smc5 & Smc6). The SMC heterodimers do not function alone and must associate with essential non-SMC subunits. To gain further insight into the essential and DNA repair roles of the Smc5-6 complex, we have purified fission yeast Smc5 and identified by mass spectrometry the co-precipitating proteins, Nse1 and Nse2. We show that both Nse1 and Nse2 interact with Smc5 in vivo, as part of the Smc5-6 complex. Nse1 and Nse2 are essential proteins and conserved from yeast to man. Loss of Nse1 and Nse2 function leads to strikingly similar terminal phenotypes to those observed for Smc5-6 inactivation. In addition, cells expressing hypomorphic alleles of Nse1 and Nse2 are, like Smc5-6 mutants, hypersensitive to DNA damage. Epistasis analysis suggests that like Smc5-6, Nse1, and Nse2 function together with Rhp51 in the homologous recombination repair of DNA double strand breaks. The results of this study strongly suggest that Nse1 and Nse2 are novel non-SMC subunits of the fission yeast Smc5-6 DNA repair complex.
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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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