Yeast transformants harboring the CBS1 gene under the control of the strong ADC1 promoter on a high copy number plasmid express the mitochondrial CBS1 protein at artificially high levels. Over-expressed protein is imported into mitochondria and correctly processed to yield the mature mitochondrial 23.5 kDa form, but differs in its solubility properties from CBS1 in wild-type mitochondria. It forms insoluble protein aggregates, which are refractory to solubilization with 1% Taurodeoxycholate. We exploited this observation to separate CBS1 from the bulk of mitochondrial proteins and to isolate CBS1 after SDS gel electrophoresis. Determination of the amino-terminal amino acids of the purified protein reveals that the mature CBS1 protein starts with Ile30, at the characteristic distance of +2 amino acids from an arginine residue (Arg28). The cleavage site shows a remarkable homology to that of subunit 9 of the F0F1 ATPase from Neurospora crassa.
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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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