Most cellular ATP is produced within the mitochondria from ADP and Pi which are delivered across the inner-membrane by specific nuclearly encoded polytopic carriers. In Saccharomyces cerevisiae, some of these carriers and in particular the ADP/ATP carrier, are represented by several related isoforms that are distinct in their pattern of expression. Until now, only one mitochondrial Pi carrier (mPic) form, encoded by the MIR1 gene in S. cerevisiae, has been described. Here we show that the gene product encoded by the YER053C ORF also participates in the delivery of phosphate to the mitochondria. We have called this gene PIC2 for Pi carrier isoform 2. Overexpression of PIC2 compensates for the mitochondrial defect of the double mutant Deltamir1 Deltapic2 and restores phosphate transport activity in mitochondria swelling experiments. The existence of two isoforms of mPic does not seem to be restricted to S. cerevisiae as two Arabidopsis thaliana cDNAs encoding two different mPic-like proteins are also able to complement the double mutant Deltamir1 Deltapic2. Finally, we demonstrate that Pic2p is a mitochondrial protein and that its steady state level increases at high temperature. We propose that Pic2p is a minor form of mPic which plays a role under specific stress conditions.
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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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