The SEC20 gene of Saccharomyces cerevisiae encodes a 50 kDa type II integral membrane glycoprotein that is required for endoplasmic reticulum (ER) to Golgi transport. Here, we have used a genetic screen, based on the lethal effect of overexpressing the cytoplasmic domain of Sec20p, to identify a novel cytosolic factor that interacts with SEC20. This factor is an 80 kDa cytoplasmic protein encoded by the TIP1 (SEC twenty interacting protein) gene. Coimmunoprecipitation and immunofluorescence using Tip1p and Sec20p or its cytoplasmic domain showed that the two proteins physically interact to form a stable complex. Like SEC20, TIP1 is required for ER to Golgi transport and depletion of Tip1p results in accumulation of an extensive network of ER plus small transport vesicles. We therefore propose that Sec20p and Tip1p act together as a functional unit in the ER to Golgi transport step.
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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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