In order to identify determinants governing nuclear protein localization, we constructed a set of hybrid genes by fusing the S. cerevisiae gene, MAT alpha 2, coding for a presumptive nuclear protein, and the E. coli gene, lacZ, coding for beta-galactosidase. The resultant hybrid proteins contain 3, 13, 25, 67, or all 210 amino acids of wild-type alpha 2 protein at the amino terminus and a constant, enzymatically active portion of beta-galactosidase at the carboxy terminus. Indirect immunofluorescence and subcellular fractionation studies with yeast cells containing the alpha 2-LacZ hybrid proteins indicate that the alpha 2 segment can direct localization of beta-galactosidase to the nucleus. A segment as small as 13 amino acids from alpha 2 is sufficient for this localization. Comparison of amino acid sequences of other nuclear proteins with this region of alpha 2 reveals a sequence that may be necessary for nuclear targeting. Production of some alpha 2-LacZ hybrid proteins causes cell death, perhaps as a result of improper or incomplete localization. These studies also indicate that the alpha 2 protein, argued on genetic grounds to be a negative regulator, acts in the yeast nucleus.
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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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