Ferrochelatase, the terminal enzyme of the heme biosynthetic pathway, is a nuclear encoded protein that is synthesized in the cytoplasm in a precursor form and then is translocated to the matrix side of the inner mitochondrial membrane. Since the product of the enzymatic reaction, protoheme IX, is utilized almost exclusively in the cytoplasmic compartment or on the cytoplasmic side of the inner mitochondrial membrane, it was of interest to determine if the intracellular location of ferrochelatase-deficient strain of the yeast Saccharomyces cerevisiae vectors that coded for full-length ferrochelatase and a truncated form of the enzyme that lacked the mitochondrial targeting sequence were expressed. Both of these transformed cells produce approximately equal total amounts of ferrochelatase, as determined by enzyme assays and Western blot analysis, but only with the full-length construct was ferrochelatase properly localized. In cells containing the truncated construct, ferrochelatase activity was found in all membrane fractions but was not located on the matrix side of the inner mitochondrial membrane. Cells containing either construct produced heme, although the amount of heme synthesized by cells with the truncated construct was significantly less. Interestingly in cells with improperly localized ferrochelatase the amount of b-type cytochrome decreased by 80% as opposed to c- and a-type cytochromes where the decreases were only 60 and 40%, respectively.
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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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