Mitochondrial outer membrane proteins are synthesized without a cleavable presequence but instead contain segments responsible for mitochondrial targeting and membrane integration within the molecule: the transmembrane segment (TMS) and N- or C-terminal flanking segment. We analyzed targeting and integration of Tom5, a C-tail anchor protein associated with the preprotein translocase of the outer membrane, to the yeast mitochondrial outer membrane in vivo using green fluorescent protein as the reporter and compared the signal with other signals for proteins dispersed in the membrane. The functional assembly of Tom5 into the TOM complex was assessed by blue native PAGE and complementation of temperature-sensitive deltatom5 cells. Correct targeting and assembly required (i). an appropriate length TMS rather than hydrophobicity, (ii). a proline residue located at correct position in the TMS and specific residues near the proline, and (iii). that, in contrast to proteins dispersed in the outer membrane, the positive C-terminal segment was dispensable. Based on these findings, we constructed green fluorescent protein fusions with a C-terminal TMS in which the deduced sequences (minimum: Ser-Pro-Met) were inserted at an appropriate position within artificial Leu-Ala repeats. They were targeted to mitochondria and complemented the temperature-sensitive growth phenotype of deltatom5 yeast cells. The membrane-targeting mechanism of Tom5 appears to be distinct from that for proteins that are dispersed in the outer membrane.
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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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