Inositol starvation of auxotrophic yeast interrupts glycolipid biosynthesis and prevents lipid modification of a normally glycosyl phosphatidylinositol (GPI)-linked protein, Gas1p. The unanchored Gas1p precursor undergoes progressive modification in the endoplasmic reticulum (ER), but is not modified by Golgi-specific glycosylation. Starvation-induced defects in anchor assembly and protein processing are rapid, and occur without altered maturation of other proteins. Cells remain competent to manufacture anchor components and to process Gas1p efficiently once inositol is restored. Newly synthesized Gas1p is packaged into vesicles formed in vitro from perforated yeast spheroplasts incubated with either yeast cytosol or the purified Sec proteins (COP II) required for vesicle budding from the ER. In vitro synthesized vesicles produced by inositol-starved membranes do not contain detectable Gas1p. These studies demonstrate that COP II components fulfill the soluble protein requirements for packaging a GPI-anchored protein into ER-derived transport vesicles. However, GPI anchor attachment is required for this packaging to occur.
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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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