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Genetics. Jan 2003; 163(1): 69–77.
PMCID: PMC1462426

Specialization of function among aldehyde dehydrogenases: the ALD2 and ALD3 genes are required for beta-alanine biosynthesis in Saccharomyces cerevisiae.

Abstract

The amino acid beta-alanine is an intermediate in pantothenic acid (vitamin B(5)) and coenzyme A (CoA) biosynthesis. In contrast to bacteria, yeast derive the beta-alanine required for pantothenic acid production via polyamine metabolism, mediated by the four SPE genes and by the FAD-dependent amine oxidase encoded by FMS1. Because amine oxidases generally produce aldehyde derivatives of amine compounds, we propose that an additional aldehyde-dehydrogenase-mediated step is required to make beta-alanine from the precursor aldehyde, 3-aminopropanal. This study presents evidence that the closely related aldehyde dehydrogenase genes ALD2 and ALD3 are required for pantothenic acid biosynthesis via conversion of 3-aminopropanal to beta-alanine in vivo. While deletion of the nuclear gene encoding the unrelated mitochondrial Ald5p resulted in an enhanced requirement for pantothenic acid pathway metabolites, we found no evidence to indicate that the Ald5p functions directly in the conversion of 3-aminopropanal to beta-alanine. Thus, in Saccharomyces cerevisiae, ALD2 and ALD3 are specialized for beta-alanine biosynthesis and are consequently involved in the cellular biosynthesis of coenzyme A.

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Selected References

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