Previous studies in yeast have revealed the presence of four proteins with a conserved, cysteine-rich, ARF GAP domain that share the ability to suppress the conditional growth defect of the arf1-3 mutant. Three of these proteins have been shown previously to be ADP-ribosylation factor (ARF) GTPase-activating proteins (GAPs). We now demonstrate that the fourth also exhibits in vitro ARF GAP activity and correlates the suppressor and ARF GAP activities for all four. Because the four ARF GAP proteins are quite diverse outside the ARF GAP domain, a genetic analysis was undertaken to define the level of functional cross-talk between them. A large number of synthetic defects were observed that point to a high degree of functional overlap among the four ARF GAPs. However, several differences were also noted in the ability of each gene to suppress the synthetic defects of others and in the impact of single or combined deletions on assays of membrane traffic. We interpret these results as supportive evidence for roles of ARF GAPs in a number of distinct, essential cellular processes that include cell growth, protein secretion, endocytosis and cell cycling. The description of the specificities of the ARF GAPs for the different responses is viewed as a necessary first step in dissecting biologically relevant pathways through a functionally overlapping family of signalling proteins.
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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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