The structural maintenance of chromosomes (SMC) family of proteins play key roles in the organization, packaging, and repair of chromosomes. Cohesin (Smc1+3) holds replicated sister chromatids together until mitosis, condensin (Smc2+4) acts in chromosome condensation, and Smc5+6 performs currently enigmatic roles in DNA repair and chromatin structure. The SMC heterodimers must associate with non-SMC subunits to perform their functions. Using both biochemical and genetic methods, we have isolated a novel subunit of the Smc5+6 complex, Nse3. Nse3 is an essential nuclear protein that is required for normal mitotic chromosome segregation and cellular resistance to a number of genotoxic agents. Epistasis with Rhp51 (Rad51) suggests that like Smc5+6, Nse3 functions in the homologous recombination based repair of DNA damage. We previously identified two non-SMC subunits of Smc5+6 called Nse1 and Nse2. Analysis of nse1-1, nse2-1, and nse3-1 mutants demonstrates that they are crucial for meiosis. The Nse1 mutant displays meiotic DNA segregation and homologous recombination defects. Spore viability is reduced by nse2-1 and nse3-1, without affecting interhomolog recombination. Finally, genetic interactions shared by the nse mutants suggest that the Smc5+6 complex is important for replication fork stability.
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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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