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Isotopic Tracers Unveil Distinct Fates for Nitrogen Sources during Wine Fermentation with Two Non-Saccharomyces Strains

AuthorsSu, Ying; Seguinot, Pauline; Bloem, Audrey; Ortiz-Julien, Anne; Heras, José María; Guillamón, José Manuel ; Camarasa, Carole
Keywords15N- and 13C-isotope labelling
Quantitative analysis of metabolism
Nitrogen resource management
Torulaspora delbrueckii
Metschnikowia pulcherrima
Issue Date16-Jun-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationMicroorganisms 8(6): 904 (2020)
AbstractNon-Saccharomyces yeast strains have become increasingly prevalent in the food industry, particularly in winemaking, because of their properties of interest both in biological control and in complexifying flavour profiles in end-products. However, unleashing the full potential of these species would require solid knowledge of their physiology and metabolism, which is, however, very limited to date. In this study, a quantitative analysis using 15N-labelled NH4Cl, arginine, and glutamine, and 13C-labelled leucine and valine revealed the specificities of the nitrogen metabolism pattern of two non-Saccharomyces species, Torulaspora delbrueckii and Metschnikowia pulcherrima. In T. delbrueckii, consumed nitrogen sources were mainly directed towards the de novo synthesis of proteinogenic amino acids, at the expense of volatile compounds production. This redistribution pattern was in line with the high biomass-producer phenotype of this species. Conversely, in M. pulcherrima, which displayed weaker growth capacities, a larger proportion of consumed amino acids was catabolised for the production of higher alcohols through the Ehrlich pathway. Overall, this comprehensive overview of nitrogen redistribution in T. delbrueckii and M. pulcherrima provides valuable information for a better management of co- or sequential fermentation combining these species with Saccharomyces cerevisiae.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/microorganisms8060904
Appears in Collections:(IATA) Artículos
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