Abstract
Cch1p and Mid1p are components of a high-affinity Ca2+-permeable channel in the yeast plasma membrane. Here, we show that growth of mutants in the Cch1pMid1p channel is markedly hypersensitive to low temperature and to high iron concentration in the medium. Both phenotypes were suppressed by high Ca2+ concentration. Iron stress elicited an increased Ca2+ influx into both wild type and cch1 Delta mid Delta yeast. Inhibition of calcineurin strongly depressed growth of iron-stressed wild type yeast, indicating that calcineurin is a downstream element of the iron stress response. Iron hypersensitivity of the cch1 Delta mid1 Delta mutant was not associated with an increased iron uptake. An involvement of oxidative stress in the iron-hypersensitive phenotype was indicated by the findings that the antioxidants tocopheryl acetate and (ethyl)glutathione improved growth and viability of the iron-stressed mutant. Further, the degree of glutathione oxidation was increased in the presence of iron. The results indicate that iron stress leads to an increased oxidative poise and that Cch1pMid1p is essential to tolerate this condition. (c) 2005 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.
| Original language | English |
|---|---|
| Pages (from-to) | 5697-5703 |
| Number of pages | 7 |
| Journal | FEBS Letters |
| Volume | 579 |
| Issue number | 25 |
| DOIs | |
| Publication status | Published - 24 Oct 2005 |
Keywords
- calcium
- channel
- cold stress
- iron toxicity
- Saccharomyces cerevisiae
- OXIDATIVE STRESS
- YEAST
- GLUTATHIONE
- INFLUX
- CALCINEURIN
- HOMOLOG
- PROTEIN
- HOMEOSTASIS
- DISULFIDE
- DISEASE