Systems-based approaches enable identification of gene targets which improve the flavour profile of low-ethanol wine yeast strains

Cristian Varela*, Simon A. Schmidt, Anthony R. Borneman, Chi Nam Ignatius Pang, Jens O. Krömerx, Alamgir Khan, Xiaomin Song, Mark P. Hodson, Mark Solomon, Christine M. Mayr, Wade Hines, Isak S. Pretorius, Mark S. Baker, Ute Roessner, Meagan Mercurio, Paul A. Henschke, Marc R. Wilkins, Paul J. Chambers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Metabolic engineering has been vital to the development of industrial microbes such as the yeast Saccharomyces cerevisiae. However, sequential rounds of modification are often needed to achieve particular industrial design targets. Systems biology approaches can aid in identifying genetic targets for modification through providing an integrated view of cellular physiology. Recently, research into the generation of commercial yeasts that can produce reduced-ethanol wines has resulted in metabolically-engineered strains of S. cerevisiae that are less efficient at producing ethanol from sugar. However, these modifications led to the concomitant production of off-flavour by-products. A combination of transcriptomics, proteomics and metabolomics was therefore used to investigate the physiological changes occurring in an engineered low-ethanol yeast strain during alcoholic fermentation. Integration of ‘omics data identified several metabolic reactions, including those related to the pyruvate node and redox homeostasis, as being significantly affected by the low-ethanol engineering methodology, and highlighted acetaldehyde and 2,4,5-trimethyl-1,3-dioxolane as the main off-flavour compounds. Gene remediation strategies were then successfully applied to decrease the formation of these by-products, while maintaining the ‘low-alcohol’ phenotype. The data generated from this comprehensive systems-based study will inform wine yeast strain development programmes, which, in turn, could potentially play an important role in assisting winemakers in their endeavour to produce low-alcohol wines with desirable flavour profiles.

Original languageEnglish
Pages (from-to)178-191
Number of pages14
JournalMetabolic Engineering
Volume49
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Low-alcohol
  • Systems biology
  • Wine
  • Yeast

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