New genes involved in osmotic stress tolerance in saccharomyces cerevisiae

  1. Gonzalez, R. 6
  2. Morales, P. 6
  3. Tronchoni, J. 6
  4. Cordero-Bueso, G. 3
  5. Vaudano, E. 1
  6. Quirós, M. 5
  7. Novo, M. 4
  8. Torres-Pérez, R. 6
  9. Valero, E. 2
  1. 1 Consiglio per la Ricerca in Agricoltura e l'Analisi dell'Economia Agraria, Centro di Ricerca per l'Enologia, Asti, Italy
  2. 2 Universidad Pablo de Olavide
    info

    Universidad Pablo de Olavide

    Sevilla, España

    ROR https://ror.org/02z749649

  3. 3 Universidad de Cádiz
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    Universidad de Cádiz

    Cádiz, España

    ROR https://ror.org/04mxxkb11

  4. 4 Universitat Rovira i Virgili
    info

    Universitat Rovira i Virgili

    Tarragona, España

    ROR https://ror.org/00g5sqv46

  5. 5 Evolva Biotech A/S, Copenhagen, Denmark
  6. 6 Instituto de Ciencias de la Vid y del Vino
    info

    Instituto de Ciencias de la Vid y del Vino

    Logroño, España

    ROR https://ror.org/01rm2sw78

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Revista:
Frontiers in Microbiology

ISSN: 1664-302X

Ano de publicación: 2016

Volume: 7

Número: SEP

Tipo: Artigo

DOI: 10.3389/FMICB.2016.01545 SCOPUS: 2-s2.0-84993965400 WoS: WOS:000384202400001 GOOGLE SCHOLAR

Outras publicacións en: Frontiers in Microbiology

Obxectivos de Desenvolvemento Sustentable

Resumo

Adaptation to changes in osmolarity is fundamental for the survival of living cells, and has implications in food and industrial biotechnology. It has been extensively studied in the yeast Saccharomyces cerevisiae, where the Hog1 stress activated protein kinase was discovered about 20 years ago. Hog1 is the core of the intracellular signaling pathway that governs the adaptive response to osmotic stress in this species. The main endpoint of this program is synthesis and intracellular retention of glycerol, as a compatible osmolyte. Despite many details of the signaling pathways and yeast responses to osmotic challenges have already been described, genome-wide approaches are contributing to refine our knowledge of yeast adaptation to hypertonic media. In this work, we used a quantitative fitness analysis approach in order to deepen our understanding of the interplay between yeast cells and the osmotic environment. Genetic requirements for proper growth under osmotic stress showed both common and specific features when hypertonic conditions were induced by either glucose or sorbitol. Tolerance to high-glucose content requires mitochondrial function, while defective protein targeting to peroxisome, GID-complex function (involved in negative regulation of gluconeogenesis), or chromatin dynamics, result in poor survival to sorbitol-induced osmotic stress. On the other side, the competitive disadvantage of yeast strains defective in the endomembrane system is relieved by hypertonic conditions. This finding points to the Golgi-endosome system as one of the main cell components negatively affected by hyperosmolarity. Most of the biological processes highlighted in this analysis had not been previously related to osmotic stress but are probably relevant in an ecological and evolutionary context. © 2016 Gonzalez, Morales. © 2016 Gonzalez, Morales, Tronchoni, Cordero-Bueso, Vaudano, Quirós, Novo, Torres-Pérez and Valero.