Ubiquinone was biosynthesized when rat liver mitochondria were incubated with S-adenosyl-L-methionine, solanesyl diphosphate, and [U-14C]p-hydroxybenzoate. The intermediates of ubiquinone biosynthesis but not ubiquinone were accumulated in mitochondria incubated without S-adenosyl-L-methionine and the accumulated intermediates were converted to ubiquinone by the addition of the methyl group donor and an excess of cold p-hydroxybenzoate. No solaneylated compounds except nonaprenyl p-hydroxybenzoate were found in sonicated mitochondria, while the biosynthesis of ubiquinone was observed in the sonicated preparation of mitochondria in which the intermediates accumulated. The results indicate that the initial decarboxylation reaction is completely abolished and the subsequent reactions of hydroxylation and methylation are not completely inhibited by the sonication treatment and therefore the decarboxylation reaction is the next step after nonaprenylation of p-hydroxybenzoate. Mitoplasts could biosynthesize ubiquinone with activity comparable to that of intact mitochondria, suggesting that components of the outer membrane and the intermembranous space of mitochondria are not involved in ubiquinone biosynthesis.
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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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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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