Yeast secretory (sec) mutants that are blocked in the transport of secretory proteins and accumulate membrane organelles were used to study the biosynthesis of fatty acid-acylated proteins. Four proteins were labeled with [3H]palmitate in sec mutants accumulating endoplasmic reticulum membranes. Three of these (molecular weights approximately equal to 20,000, 50,000, and 120,000) were N-linked glycoproteins, based on their ability to be labeled with [3H]mannose and their sensitivity to endoglycosidase H. The fourth protein (molecular weight approximately equal to 30,000) also was labeled with [3H]mannose but was insensitive to endoglycosidase H; it appeared to contain O-linked sugars. In sec mutants accumulating Golgi membranes or post-Golgi vesicles, a 35-kilodalton protein was labeled with [3H]palmitate. Analysis of Staphylococcus aureus protease V8 digests and pulse-chase experiments indicated that the 30-kilodalton protein was a precursor of 35 kilodaltons. None of these proteins was labeled with [3H]palmitate in a sec mutant that blocked the penetration of nascent polypeptides into endoplasmic reticulum; thus, acylation occurred in endoplasmic reticulum. All four proteins could be recovered from fractions enriched for yeast membranes. Fatty acids were not released from proteins by boiling in sodium dodecyl sulfate or extraction with organic solvents but were recovered as methyl esters after proteins were treated with KOH-methanol, a reaction characteristic of an acyl ester linkage.
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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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