| Autor: |
Westwater, John, McLaren, Niall F., Dormer, Ulla H., Jamieson, Derek J. |
| Zdroj: |
Yeast; February 2002, Vol. 19 Issue: 3 p233-239, 7p |
| Abstrakt: |
The budding yeast Saccharomyces cerevisiaehas been shown to possess a number of discrete but overlapping adaptive stress responses. We show here that yeast has an adaptive stress response towards mercury and that this response overlaps to some extent with the H2O2and cadmium‐inducible stress responses. Expression of the yeast GSH1gene, encoding γ‐glutamylcysteine synthetase, is known to be regulated by hydrogen peroxide; in this study we show that expression of a GSH1–lacZreporter gene is shown to be regulated by exposure to heavy metals, such as mercury and cadmium. Other redox‐active metals, including copper and iron, were found not to induce GSH1expression. We show that mercury‐mediated regulation of the GSH1gene is not by the same mechanism used by cadmium. Moreover, our experiments suggest the possibility that the oxidative stress produced by mercury exposure is similar to that produced by treatment with H2O2, consistent with our finding that the Yap1 protein is also involved in the response of yeast towards mercury. Copyright © 2002 John Wiley & Sons, Ltd. |
| Databáze: |
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