Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/123171
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Type: Journal article
Title: Appropriate vacuolar acidification in Saccharomyces cerevisiae is required for efficient high sugar fermentation
Author: Nguyen, T.D.
Walker, M.E.
Gardner, J.M.
Jiranek, V.
Citation: Food Microbiology, 2018; 70:262-268
Publisher: Elsevier
Issue Date: 2018
ISSN: 0740-0020
1095-9998
Statement of
Responsibility: 
Trung D. Nguyen, Michelle E. Walker, Jennifer M. Gardner, Vladimir Jiranek
Abstract: Vacuolar acidification serves as a homeostatic mechanism to regulate intracellular pH, ion and chemical balance, as well as trafficking and recycling of proteins and nutrients, critical for normal cellular function. This study reports on the importance of vacuole acidification during wine-like fermentation. Ninety-three mutants (homozygous deletions in lab yeast strain, BY4743), which result in protracted fermentation when grown in a chemically defined grape juice with 200 g L⁻¹ sugar (pH 3.5), were examined to determine whether fermentation protraction was in part due to a dysfunction in vacuolar acidification (VA) during the early stages of fermentation, and whether VA was responsive to the initial sugar concentration in the medium. Cells after 24 h growth were dual-labelled with propidium iodide and vacuolar specific probe 6-carboxyfluorescein diacetate (6-CFDA) and examined with a FACS analyser for viability and impaired VA, respectively. Twenty mutants showed a greater than two-fold increase in fluorescence intensity; the experimental indicator for vacuolar dysfunction; 10 of which have not been previously annotated to this process. With the exception of ∆hog1, ∆pbs2 and ∆vph1 mutants, where dysfunction was directly related to osmolality; the remainder exhibited increased CF-fluorescence, independent of sugar concentration at 20 g L⁻¹ or 200 g L⁻¹. These findings offer insight to the importance of VA to cell growth in high sugar media.
Keywords: High sugar fermentation; Fermentation essential genes; Vacuolar acidification; 6-Carboxyfluorescein diacetate; Propidium iodide
Description: Available online 4 October 2017
Rights: © 2017 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.fm.2017.09.021
Grant ID: http://purl.org/au-research/grants/arc/IC130100005
Published version: http://dx.doi.org/10.1016/j.fm.2017.09.021
Appears in Collections:Agriculture, Food and Wine publications
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