In Saccharomyces cerevisiae, acetate is formed by acetaldehyde dehydrogenase (ACDH), a key enzyme of the pyruvate dehydrogenase (PDH) bypass, which fulfils the essential task of generating acetyl-CoA in the cytosol. The role of the five members of the ACDH family (ALD genes) was investigated during anaerobic growth on glucose. Single and multiple ald Delta mutants were generated in the wine-yeast-derived V5 and laboratory CEN.PK strains and analysed under standard (YPD 5 % glucose) and wine (MS 20 % glucose) fermentation conditions. The deletion of ALD6 and ALD5 decreased acetate formation in both strains, demonstrating for the first time that the mitochondrial Ald5p isoform is involved in the biosynthesis of acetate during anaerobic growth on glucose. Acetate production of the ald4 Delta mutant was slightly decreased in the CEN.PK strain during growth on YPD only. In contrast, the deletion of ALD2 or ALD3 had no effect on acetate production. The absence of Ald6p was compensated by the mitochondrial isoforms and this involves the transcriptional activation of ALD4. Consistent with this, growth retardation was observed in ald6 Delta ald4 Delta, and this effect was amplified by the additional deletion of ALD5. A ald Delta null mutant, devoid of ACDH activity, was viable and produced similar levels of acetate to the ald6 Delta ald4 Delta ald5 Delta strain, excluding a role of Ald2p and Ald3p. Thus, acetate is mainly produced by the cytosolic PDH bypass via Ald6p and by a mitochondrial route involving Ald5p. An unknown alternative pathway can compensate for the loss of Ald6p, Ald4p and Ald5p.
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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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