Mitochondria cannot be made de novo. Mitochondrial biogenesis requires that up to 1000 proteins are imported into mitochondria, and the protein import pathway relies on hetero-oligomeric translocase complexes in both the inner and outer mitochondrial membranes. The translocase in the outer membrane, the TOM complex, is composed of a core complex formed from the beta-barrel channel Tom40 and additional subunits each with single, alpha-helical transmembrane segments. How alpha-helical transmembrane segments might be assembled onto a transmembrane beta-barrel in the context of a membrane environment is a question of fundamental importance. The master receptor subunit of the TOM complex, Tom20, recognizes the targeting sequence on incoming mitochondrial precursor proteins, binds these protein ligands, and then transfers them to the core complex for translocation across the outer membrane. Here we show that the transmembrane segment of Tom20 contains critical residues essential for docking the Tom20 receptor into its correct environment within the TOM complex. This crucial docking reaction is catalyzed by the unique assembly factor Mim1/Tom13. Mutations in the transmembrane segment that destabilize Tom20, or deletion of Mim1, prevent Tom20 from functioning as a receptor for protein import into mitochondria.
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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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Evidence ID | Analyze ID | File | Description |
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