terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Uncovering the interplay between Copper and SO2 tolerance in Saccharomyces cerevisiae

Uncovering the interplay between Copper and SO2 tolerance in Saccharomyces cerevisiae

Abstract

Copper and SO2 tolerance are two well-studied phenotypic traits of Saccharomyces cerevisiae. The genetic bases of these traits are the allelic expansion at the CUP1 locus and reciprocal translocation at the SSU1 locus, respectively. Previous work identified a negative association between SO2 and copper tolerance in S. cerevisiae wine yeasts. To understand the genetic basis of copper sensitivity, we used bulk-segregant QTL analysis and identified genetic variation at the SSU1 locus as a causative factor. This was confirmed through reciprocal hemizygosity analysis in a strain with 20 copies of CUP1. Transcriptional and proteomic analysis revealed that over-expression of SSU1 didn’t suppress CUP1 expression or limit protein production. Instead, it induced sulfur limitation when exposed to copper.Furthermore, we observed that an SSU1 over-expressing strain became more sensitive to moderately elevated copper concentrations in sulfur-limited conditions, indicating a burden on the sulfate assimilation pathway. Over-expression of MET 3/14/16, genes upstream of H2S production in the sulfate assimilation pathway increased the production of SO2 and H2S but did not improve copper sensitivity in an SSU1 over-expressing background. We conclude that copper and SO2 tolerance are conditional traits in S. cerevisiae and provide evidence of the metabolic basis for their mutual exclusivity.

Acknowledgements: For genome sequencing the authors would like to thank the Ramaciotti Center for Genomics which is funded through Bioplatforms Australia Pty Ltd (BPA), a National Collaborative Research Infrastructure Strategy (NCRIS). Proteomic data acquisition was obtained with support of the Adelaide Proteomics Centre at The University of Adelaide, in partnership with the South Australian Health and Medical Research Institute Proteomics Core Facility

References:

1)  Onetto CA. et al. (2023). SO2 and copper tolerance exhibit an evolutionary trade-off in Saccharomyces cerevisiae. PLoS Genetics, 19(3), e1010692.

DOI:

Publication date: October 10, 2023

Issue: ICGWS 2023

Type: Poster

Authors

Cristobal Onetto1*, Dariusz Kutyna1, Radka Kolouchova1, Jane McCarthy1, Anthony Borneman1, Simon Schmidt1

1The Australian Wine Research Institute, Glen Osmond, South Australia, Australia

Contact the author*

Keywords

Saccharomyces cerevisiae, Copper tolerance, SO2 tolerance

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Polysaccharide families of lyophilized extracts obtained from unfermented varietal grape pomaces

The recovery of bioactive compounds from grape and wine by-products is currently an important objective for revaluation and sustainability. Grape pomace is one of the main by-products and is a rich source of some bioactive compounds. The aim of this study was to evaluate the polysaccharide (PS) composition of extracts obtained from pomaces of different white and red grape varieties of Castilla y León. Grape pomaces were obtained after the pressing in the winemaking process.

Read More

New tool to evaluate color modifications during oxygen consumption in white and red wines

Measuring the effect of oxygen consumption on the color of wines as the level of dissolved oxygen decreases over time is very useful to know how much oxygen a wine can consume without significantly altering its color. The changes produced in wine after being exposed to high oxygen concentrations have been studied by different authors, but in all cases the wine has been analyzed once the oxygen consumption process has been completed. This work presents the results obtained with the use of an equipment designed and made to measure simultaneously the level of dissolved oxygen and the spectrum of the wine, during the oxygen consumption process from saturation levels with air to very low levels, which indicate the total consumption of the dosed oxygen[1,2].

Read More

Predicting provenance and grapevine cultivar implementing machine learning on vineyard soil microbiome data: implications in grapevine breeding

The plant rhizosphere microbial communities are an essential component of plant microbiota, which is crucial for sustaining the production of healthy crops. The main drivers of the composition of such communities are the growing environment and the planted genotype. Recent viticulture studies focus on understanding the effects of these factors on soil microbial composition since microbial biodiversity is an important determinant of plant phenotype, and of wine’s organoleptic properties. Microbial biodiversity of different wine regions, for instance, is an important determinant of wine terroir.

Read More

The weak role of organic mulches in shaping bacterial communities in grapevine

The interest in sustainable and ecologic agricultural practices in grapevine has grown significantly in recent years in the context of ecological transition. Organic mulches are treatments that support the circular economy and positively affect the soil and the plant. They are an alternative to herbicides and other conventional practices since they may influence soil moisture, erosion, structure and weed control. However, their effects on the soil and must microbiota remain unknown.

Read More

Effect of ultraviolet B radiation on pathogenic molds of grapes

The fungicidal effect of UV-C radiation (100-280 nm wavelength) is well known, but its applicability for the control of pathogenic molds of grapes is conditioned by its effect on the host and by the risks inherent in its handling[1].
As an alternative, the effect in vitro of UV-B radiation (280-315 nm) on the main pathogenic molds of grapes has been studied: Botrytis cinerea, Aspergillus niger, Penicillium expansum and Rhizopus stolonifer.

Read More