We describe the isolation of MSI4 as a multicopy suppressor of ira1 (inhibitory regulator of Ras). We find it encodes a 66-kDa protein with three regions similar to component A of Rab geranylgeranyltransferase and Rab guanine nucleotide dissociation inhibitor. A gene disruption experiment showed that MSI4 is essential for cell growth. To investigate its functions further, we constructed a strain whose MSI4 is driven by the GAL1 promoter. This strain accumulated the endoplasmic reticulum precursor form of a vacuolar enzyme, carboxypeptidase Y, under the restrictive conditions. Moreover, we showed that the activity of geranylgeranyl-transferase for Ypt1p was very low in the mutant shifted to glucose medium. We propose that the MSI4 gene product is a yeast counterpart of component A of Rab geranylgeranyltransferase that is essential for Ypt1p to localize on membranes.
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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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