Retrograde transport of proteins from the Golgi to the endoplasmic reticulum (ER) has been the subject of some interest in the recent past. Here a new thermosensitive yeast mutant defective in retrieval of dilysine-tagged proteins from the Golgi back to the endoplasmic reticulum was characterized. The ret4-1 mutant also exhibited a selective defect in forward ER-to-Golgi transport of some secreted proteins at the non-permissive temperature. The corresponding RET4 gene was found to encode Glo3p, a GTPase-activating protein (GAP) specific for ADP-ribosylation factor (ARF). In vitro, the Glo3 thermosensitive mutant showed a reduced ARF1-GAP activity. The Glo3 protein belongs to a family of zinc finger proteins that may include additional ARF-GAPs. Gene deletion experiments of other family members showed that only GLO3 deletion resulted in impaired retrieval of dilysine-tagged proteins back to the ER. These results demonstrate that Glo3p is the main ARF-GAP specifically involved in ER retrieval.
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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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