Abstract
The yeast Saccharomyces cerevisiae is widely used as aroma producer in the preparation of fermented foods and beverages. During food fermentations, secondary metabolites like 3-methyl-1-butanol, 4-methyl-2-oxopentanoate, 3-methyl-2-oxobutanoate and 3-methylbutyrate emerge. These four compounds have a major influence on the final taste of fermented foods. Their presence is influenced by the availability of free branched chained amino acids (BCAA). To study the underlying molecular mechanism of the formation of these compounds, we performed genome-wide transcription analyses with cDNA microarrays. The expression profile of yeast during flavour formation, when cultivated on l-leucine, was compared to the expression profile of cells cultivated on ammonia. In addition, the expression profiles of cells cultivated in a batch culture were compared to cells cultivated under continuous growth conditions. Genome-wide gene analysis of these samples revealed a group of 117 genes, which were more than two-fold up- or down-regulated and significantly altered in gene expression (P<0.001) under both cultivation conditions. This group included genes encoding enzymes of different amino acid metabolism pathways. The group of the BCAA metabolism was not significantly altered in gene expression. Genes identified with altered expression levels, in only batch or continuous culture fermentions, represented functional groups concerning energy, protein fate, cell cycle and DNA processing. Furthermore, clustering of genome-wide data revealed that the type of cultivation overruled the differences in N-source in the gene-expression profiles. This observation emphasizes the importance of sample history in gene expression analysis.
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Acknowledgements
We are grateful to André Boorsma (Molecular Microbial Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, the Netherlands) for his input and advice concerning microarray data analyses. This work was sponsored by Unilever Research Vlaardingen and supported by Senter.
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Schoondermark-Stolk, S.A., Jansen, M., Verkleij, A.J. et al. Genome-wide transcription survey on flavour production in Saccharomyces cerevisiae . World J Microbiol Biotechnol 22, 1347–1356 (2006). https://doi.org/10.1007/s11274-006-9182-9
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DOI: https://doi.org/10.1007/s11274-006-9182-9