Complex III immunoprecipitated from yeast cells labeled in vivo with [35S]sulfate or [3H]leucine contained seven subunits with molecular weights ranging from 15,000 to 47,000 when analyzed by electrophoresis on polyacrylamide gels. The subunit composition of the immunoprecipitates was identical with that of the purified complex III isolated from bakers' yeast suggesting that the antiserum recognizes the holoenzyme assembled properly in the membrane (Sidhu, A., and Beattie, D.S. (1982) J. Biol. Chem. 257, 7879-7886). Kinetic studies using double-labeled yeast cells followed by immunoprecipitation of complex III indicated that the subunits of the complex are assembled into the holoenzyme at very different rates. Cytochromes b and c1 and the 15,000-dalton subunit were the first polypeptides to be assembled into the complex with a half-time of labeling of 2.0-2.4 min. Core protein I and the iron-sulfur protein were inserted more slowly into the complex with a half-time of labeling of 4.6 and 5.3 min, respectively. Calculations of precursor pool sizes of the subunits indicated that for both core protein I and the iron-sulfur protein, there are large pools of precursors. The iron-sulfur protein was synthesized in vivo as a larger precursor polypeptide of molecular mass 28,000 Da. The precursor was subsequently cleaved, in a process requiring an energized mitochondrial inner membrane, into an intermediate form 1,500 Da larger than the mature subunit. The conversion of the intermediate to the mature form occurred in the inner mitochondrial membrane.
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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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