Role of glutathione in detoxification of metal(loid)s by Saccharomyces cerevisiae

M. M. Gharieb, G. M. Gadd (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    82 Citations (Scopus)

    Abstract

    Cellular glutathione (GSH) was implicated in tolerance to potentially toxic metal(loid)s using two strains of Saccharomyces cerevisiae, a wild-type (∑1278b) and a GSH-deficient mutant strain (gshA-2). Both yeast strains exhibited no significant difference in tolerance to tellurite, zinc, cobalt, copper, manganese, nickel and chromate. There was no marked influence of glutathione on the accumulation of Te, Co, Cu, and Mn, although the absence of cellular glutathione significantly increased the cellular content of Zn and Ni, but greatly decreased Cr content without significant alteration of tolerance. These results indicated the independence of cellular glutathione activity from tolerance to Te, Zn, Co, Cu, Mn, Ni, and Cr. However, involvement of glutathione in Zn, Ni and Cr uptake is possible. The glutathione-deficient strain displayed a high sensitivity to selenite and cadmium in comparison to the wild-type strain of S. cerevisiae. The minimum inhibitory concentrations of Se and Cd for the glutathione-deficient strain were 980 ± 13 and 32 ± 4 μM, respectively, whereas the wild strain tolerated up to 4080 ± 198 μM Se and 148 ± 5 μM Cd. A relationship between tolerance and reduced cellular content of both Se and Cd was also shown: the mutant strain accumulated approximately three-fold more Se and two-fold more Cd than that accumulated by the wild-type strain. This suggests an influence of GSH on cellular uptake of Se and Cd, and also directly confirms the protective action of such a cellular thiol compound against Se and Cd toxicity.

    Original languageEnglish
    Pages (from-to)183-188
    Number of pages6
    JournalBioMetals
    Volume17
    Issue number2
    DOIs
    Publication statusPublished - Apr 2004

    Keywords

    • Glutathione
    • Metal resistance
    • Metalloids
    • Saccharomyces cerevisiae

    ASJC Scopus subject areas

    • Biomaterials
    • General Biochemistry,Genetics and Molecular Biology
    • General Agricultural and Biological Sciences
    • Metals and Alloys

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