alexa Malolactic Fermentation in Grape Musts by a Genetically Engineered Strain of Saccharomyces cerevisiae
Microbiology

Microbiology

Fermentation Technology

Author(s): H Volschenk, M Denayrolles

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Malate enters Saccharomyces cerevisiae by simple diffusion. Due to the lack of a malate transporter and the low affinity of the S. cerevisiae malic enzyme, this yeast is unable to degrade malate efficiently. We have constructed a malolactic yeast strain by co-expressing the malate permease gene (mae1) of the fission yeast Schizosaccharomyces pombe and the Lactococcus lactis malolactic gene (mleS) in S. cerevisiae. The recombinant strain of S. cerevisiae transported malate and actively metabolized malate to lactate within three days in Cabernet Sauvignon and Shiraz grape musts at 20°C. The malolactic fermentation in Chardonnay grape must was completed within seven days at 15°C. The efficient degradation of malate in grape musts is important to wineries and the availability of malolactic yeasts will allow the early application of cellar operations for storage and aging of wine.

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This article was published in American Journal of Enology and Viticulture and referenced in Fermentation Technology

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