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Central roles of iron in the regulation of oxidative stress in the yeast Saccharomyces cerevisiae

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Abstract

Oxygen is essential for aerobic organisms but causes cytotoxicity probably through the generation of reactive oxygen species (ROS). In this study, we screened for the genes that regulate oxidative stress in the yeast Saccharomyces cerevisiae, and found that expression of CTH2/TIS11 caused an increased resistance to ROS. CTH2 is up-regulated upon iron starvation and functions to remodel metabolism to adapt to iron starvation. We showed here that increased resistance to ROS by CTH2 would likely be caused by the decreased ROS production due to the decreased activity of mitochondrial respiration, which observation is consistent with the fact that CTH2 down-regulates the mitochondrial respiratory proteins. We also found that expression of CTH1, a paralog of CTH2, also caused an increased resistance to ROS. This finding supported the above view, because mitochondrial respiratory proteins are the common targets of CTH1 and CTH2. We further showed that supplementation of iron in medium augmented the growth of S. cerevisiae under oxidative stress, and expression of CTH2 and supplementation of iron collectively enhanced its growth under oxidative stress. Since CTH2 is regulated by iron, these findings suggested that iron played crucial roles in the regulation of oxidative stress in S. cerevisiae.

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Acknowledgements

This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan.

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Authors and Affiliations

  1. Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, 236-0027, Japan

    Ryo Matsuo, Shogo Mizobuchi, Maya Nakashima, Kensuke Miki, Dai Ayusawa & Michihiko Fujii

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  1. Ryo Matsuo
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  2. Shogo Mizobuchi
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  3. Maya Nakashima
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  4. Kensuke Miki
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  5. Dai Ayusawa
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Corresponding author

Correspondence to Michihiko Fujii.

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Communicated by M. Kupiec.

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Matsuo, R., Mizobuchi, S., Nakashima, M. et al. Central roles of iron in the regulation of oxidative stress in the yeast Saccharomyces cerevisiae . Curr Genet 63, 895–907 (2017). https://doi.org/10.1007/s00294-017-0689-4

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  • DOI: https://doi.org/10.1007/s00294-017-0689-4

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