Cytochrome c1, a subunit of the mitochondrial ubiquinol--cytochrome-c reductase, is synthesized on cytosolic ribosomes as a precursor protein of 37 kDa. Maturation to the mature 31-kDa form involves two proteolytic processing steps of the amino-terminal presequence. After removal of the amino-terminal part by the matrix-localized processing peptidase, the carboxy-terminal part of the presequence is cleaved off by an unknown intermembrane space protease. This step depends on covalent linkage of heme to the apoprotein. At least two complementation groups (I and II) can be distinguished among mutants of the yeast Saccharomyces cerevisiae, which are defective in this second proteolytic processing, i.e. they accumulate the intermediate-sized form of cytochrome c1 instead of the mature form. Recently, it was shown that complementation group II defines the structural gene for cytochrome c1 [Sadler, I., Suda, K., Schatz, G., Kaudewitz, F. & Haid, A., (1984) EMBO J. 3, 2137-2143]. We report on the molecular cloning and characterization of the CYT2 gene representing complementation group I. It maps on chromosome XI and encodes a mitochondrial protein of about 26 kDa. Extensive similarity to Neurospora crassa and S. cerevisiae cytochrome-c--heme lyase, as well as the phenotype of cyt2 mutants, strongly suggest that we have identified the gene for cytochrome-c1--heme lyase.
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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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