Members of the Oxa1p/Alb3/YidC family mediate the insertion of various organelle or bacterial hydrophobic proteins into membranes. They present at least five transmembrane segments (TM) linked by hydrophilic domains located on both sides of the membrane. To examine how Oxa1p structure relates to its function, we have introduced point mutations and large deletions into various domains of the yeast mitochondrial protein. These mutants allowed us to show the importance of the first TM domain as well as a synergistic interaction between the first loop and the C-terminal tail, which both protrude into the matrix. These mutants also led to the isolation of a high copy suppressor, OMS1, which encodes a member of the methyltransferase family. Overexpression of OMS1 seems to increase the steady-state level of both the mutant and wild-type Oxa1p. We show that Oms1p is a mitochondrial inner membrane protein inserted independently of Oxa1p. Oms1p presents one TM and a N-in C-out topology with the C-terminal domain carrying the methyltransferase-like domain. A conserved motif within this domain is essential for the suppression of oxa1 mutations. We discuss the possible role of Oms1p on Oxa1p intermembrane space domain.
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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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