Mitochondrial-nucleoid (mt-nucleoid) proteins of the yeast Saccharomyces cerevisiae were separated by two-dimensional gel electrophoresis. Analysis of the N-terminal amino acid sequence showed that a 22 kDa protein which is unique in the mt-nucleoid fraction is an unidentified protein encoded in the open reading frame YGL068W and shows a homology with the ribosomal protein L7/L12 of bacteria. We named this protein Mnp1p (for the mitochondrial-nucleoid protein 1). Immunoblotting of each fraction with an anti-Mnp1p antibody during the mt-nucleoid isolation showed that Mnp1p is highly concentrated in the mt-nucleoid fraction. Immunofluorescence microscopy suggested that Mnp1p is localized to mitochondria in vivo, and a significant amount of Mnp1p is associated with the mt-nucleoids. On the other hand, Northern blotting showed that a large amount of large and small mitochondrial ribosomal RNAs was not associated with the mt-nucleoids and remained in the supernatant after the isolation of mt-nucleoids. The null mutation of MNP1 led to a respiratory-deficient phenotype, but the morphology of the mt-nucleoids in the transformants carrying the null mutation was normal. These results suggest that a significant amount of Mnp1p plays a role as a major component of the mt-nucleoids.
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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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