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Volume 144, Issue 3

Role of trehalose in survival of under osmotic stress Free

Abstract

Trehalose is an enigmatic compound that accumulates in and has been implicated in survival under various stress conditions by acting as membrane protectant, as a supplementary compatible solute or as a reserve carbohydrate that may be mobilized during stress. In this study, specific mutants in trehalose metabolism were used to evaluate whether trehalose contributes to survival under severe osmotic stress and generates the compatible solute glycerol under moderate osmotic stress. The survival under severe osmotic stress (0.866 , NaCI or sorbitol) of mutants was compared to that of the wild-type strain when cultivated to either the mid-exponential or the stationary growth phase on glucose, galactose or ethanol. Stationary-phase cells survived better than exponential-phase cells. The death rates of ethanol-grown cells were lower than those of galactose-grown cells, which in turn survived better than glucose-grown cells. There was a strong relationship between intracellular trehalose levels and resistance to osmotic stress. The mutant strains unable to produce trehalose (Δ Δ and Δ hxk2 Δ) were more sensitive to severe osmotic stress (0.866 ) than the isogenic wild-type strain, confirming a role for trehalose in survival. Hyperaccumulation of trehalose found in the Δ and the Δ Δ mutant strains, however, did not improve survival rates compared to the wild-type strain. When wild-type, Δ and Δ Δ cells were exposed to moderate osmotic stress (0.98 and 0.97 , NaCI), which permits growth, glycerol production did not appear to be related to the intracellular trehalose levels although glycerol levels increased more rapidly in Δ cells than in wild-type cells during the initial response to osmotic stress. These data indicate that trehalose does not act as a reserve compound for glycerol synthesis under these conditions. No evidence was found for solutes other than glycerol and trehalose being significant for the survival of or growth by under osmotic stress conditions.

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Keyword(s): deletion mutants , glycerol , osmotic stress , trehalose and yeast
© Society for General Mcrobiology 1998
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1998-03-01
2024-04-18
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Role of trehalose in survival of Saccharomyces cerevisiae under osmotic stress
Microbiology 144, 671 (1998); https://doi.org/10.1099/00221287-144-3-671
/content/journal/micro/10.1099/00221287-144-3-671
/content/journal/micro/10.1099/00221287-144-3-671
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