Glycosylphosphatidylinositol (GPI) anchors of all species contain the core structure protein-CO-NH-(CH(2))(2)-PO(4)-Manalpha1-2Manalpha1-6Manalpha1-4GlcNalpha1-6inositol-PO(4)-lipid. In recent studies in yeast it was found that gpi10-1 mutants accumulate M2, an abnormal intermediate having the structure Manalpha1-6[NH(2)-(CH(2))(2)-PO(4)-->]Manalpha1-4GlcNalpha1-6(acyl-->)inositol-PO(4)-lipid. It thus was realized that yeast GPI lipids, as their mammalian counterparts, contain an additional phosphorylethanolamine side chain on the alpha1,4-linked mannose. The biosynthetic origin of this phosphorylethanolamine group was investigated using gpi10-1 Deltaept1 Deltacpt1, a strain which is unable to synthesize phosphatidylethanolamine by transferring phosphorylethanolamine from CDP-ethanolamine onto diacylglycerol, but which still can make phosphatidylethanolamine by decarboxylation of phosphatidylserine. Gpi10-1 Deltaept1 Deltacpt1 triple mutants are unable to incorporate [(3)H]ethanolamine into M2 although metabolic labeling with [(3)H]inositol demonstrates that they make as much M2 as gpi10-1. In contrast, when labeled with [(3)H]serine, the triple mutant incorporates more label into M2 than gpi10-1. This result establishes that the phosphorylethanolamine group on the alpha1,4-linked mannose is derived from phosphatidylethanolamine and not from CDP-ethanolamine.
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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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