In an earlier report, a respiration-deficient mutant of yeast which lacks all cytochromes and hemoproteins and accumulates coproporphyrin was described. This respiration-deficient mutant was temperature-sensitive and resulted from the single chromosomal gene(cyt). In this study, the activity of coproporphyrinogenase, catalyzing the conversion of coproporphyrinogen to protoporphyrinogen, was assayed in the cyt mutant and wild strains. Coproporphyrinogenase activity was 10 times higher in the cyt mutant than in the wild strains. Cells of the cyt mutant grown at 20 C had less activity than those grown at 35 C. The Michaelis constants, pH optima, and temperature activations of the enzymes of the cyt mutant and the wild strains were similar. The significance of the higher activity of this enzyme in the cyt mutant, in which this enzymatic step is apparently blocked in vivo, is discussed.
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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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