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. 2000 Dec 15;352(Pt 3):893–898.

A carbon-source-responsive element is required for regulation of the hypoxic ADP/ATP carrier (AAC3) isoform in Saccharomyces cerevisiae.

B Sokolíková 1, L Sabová 1, I Kissová 1, J Kolarov 1
PMCID: PMC1221531  PMID: 11104700

Abstract

The mitochondrial ADP/ATP carrier in Saccharomyces cerevisiae is encoded by three genes that are differentially expressed under different physiological conditions. We investigated the transcriptional control of AAC3, an oxygen-repressed isoform. By deletion analysis, DNA electrophoretic mobility-shift assays, DNase I footprinting and site-directed mutagenesis, we have identified a promoter region (upstream repressing sequence 1, URS(1)) involved in a carbon-source-dependent repression of AAC3. It is different from the previously characterized oxygen-dependent ROX1 (regulation by oxygen 1) repressor-binding region (URS(2)). The complex character of URS(1) includes the presence of two different cis-acting sequences: (i) a RAP1 (repressor activator protein 1)-binding site that is capable of binding the RAP1 protein in vitro and (ii) two putative ethanol-repression sequences, the modification of which derepresses the AAC3 gene. These findings demonstrate that the hypoxic AAC3 gene is regulated by two upstream repressor sites; one controlled by oxygen and haem, the other by the carbon source. Both sites function to completely switch off the expression of the AAC3 isoform when ATP is made by oxidative phosphorylation, and they modulate AAC3 expression when import of glycolytic ATP into mitochondria is required.

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Selected References

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