In fungi and animals the translocase in the outer mitochondrial membrane (TOM complex) consists of multiple components including the receptor subunit Tom70. Genome sequence analyses suggest no Tom70 receptor subunit exists in plants or protozoans, raising questions about its ancestry, function and the importance of its activity. Here we characterise the relationships within the Tom70 family of proteins. We find that in both fungi and animals, a conserved domain structure exists within the Tom70 family, with a transmembrane segment followed by 11 tetratricopeptide repeat motifs organised in three distinct domains. The C-terminal domain of Tom70 is highly conserved, and crucial for the import of hydrophobic substrate proteins, including those with and those without N-terminal presequences. Tom70 likely arose after fungi and animals diverged from other eukaryote lineages including plants, and subsequent gene duplication gave rise to a paralogue specific to the Saccharomyces group of yeasts. In animals and in fungi, Tom70 plays a fundamental role in the import of precursor proteins, by assisting relatively hydrophobic regions of substrate proteins into the translocation channel in the outer mitochondrial membrane. Proteins that function equivalently to Tom70 may have arisen independently in plants and protists.
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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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