Proteins destined for all submitochondrial compartments are translocated across the outer mitochondrial membrane by the TOM (translocase of the outer membrane) complex, which consists of a number of specialized receptor subunits that bind mitochondrial precursor proteins for delivery into the translocation channel. One receptor, Tom70, binds large, hydrophobic mitochondrial precursors. The current model of Tom70-mediated import involves multiple dimers of the receptor recognizing a single molecule of substrate. Here we show via a battery of biophysical and spectroscopic techniques that the cytosolic domain of Tom70 is an elongated monomer. Thermal and urea-induced denaturation revealed that the receptor, which unfolds via a multistate pathway, is a relatively unstable molecule undergoing major conformational change at physiological temperatures. The data suggest that the malleability of the monomeric Tom70 receptor is an important factor in mitochondrial import.
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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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