The evolutionary conserved protein Sem1/Dss1 is a bona fide subunit of the regulatory particle (RP) of the proteasome and in mammalian cells stabilizes the tumor suppressor protein BRCA2. A recent study from our laboratory has revealed an unexpected non- proteasomal role of Sem1 in mRNA export. We found that Sem1, independent of the RP, is a functional component of the nuclear pore associated TREX-2 complex that is directly involved in the dynamic relocalization of a subset of DNA loci to the nuclear periphery. Like other components of TREX-2, Sem1 is required for proper nuclear export of mRNAs, transcription elongation and preventing transcription-associated genomic instability. Strikingly, Sem1 associates with a third multi-subunit protein complex namely the COP9 signalosome, which is involved in de-neddylation. We propose that Sem1 is a versatile protein that regulates the functional integrity of multiple protein complexes involved in diverse biological pathways.
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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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