Turnover of phospholipids in the yeast Saccharomyces cerevisiae generates intracellular glycerophosphocholine (GPC). Here we show that GPC can be reacylated in an acyl-CoA-dependent reaction by yeast microsomal membranes. The lysophosphatidylcholine that is formed in this reaction is efficiently further acylated to phosphatidylcholine (PC) by yeast microsomes, thus providing a new pathway for PC biosynthesis that can either recycle endogenously generated GPC or utilize externally provided GPC. Genetic and biochemical evidence suggests that this new enzymatic activity, which we call GPC acyltransferase (GPCAT), is not mediated by any of the previously known acyltransferases in yeast. The GPCAT activity has an apparent V(max) of 8.7 nmol/min/mg protein and an apparent K(m) of 2.5 mM. It has a neutral pH optimum, similar to yeast glycerol-3-phosphate acyltransferase, but differs from the latter in being more heat stable. The GPCAT activity is sensitive to N-ethylmaleimide, phenanthroline, and Zn(2+) ions. In vivo experiments showed that PC is efficiently labeled when yeast cells are fed with [(3)H]choline-GPC, and that this reaction occurs also in pct1 knockout strains, where de novo synthesis of PC by the CDP-choline pathway is blocked. This suggests that GPCAT can provide an alternative pathway for PC biosynthesis in vivo.
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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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