Martins, Dorival and English, Ann M. 
ORCID: https://orcid.org/0000-0002-3696-7710
(2014)
Catalase activity is stimulated by H2O2 in rich culture medium and is required for H2O2 resistance and adaptation in yeast.
Redox Biology, 2
.
pp. 308-313.
ISSN 22132317
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Official URL: http://dx.doi.org/10.1016/j.redox.2013.12.019
Abstract
Catalases are efficient scavengers of H2O2 and protect cells against H2O2 stress. Examination of the H2O2 stimulon in Saccharomyces cerevisiae revealed that the cytosolic catalase T (Ctt1) protein level increases 15-fold on H2O2 challenge in synthetic complete media although previous work revealed that deletion of the CCT1 or CTA1 genes (encoding peroxisomal/mitochondrial catalase A) does not increase the H2O2 sensitivity of yeast challenged in phosphate buffer (pH 7.4). This we attributed to our observation that catalase activity is depressed when yeast are challenged with H2O2 in nutrient-poor media. Hence, we performed a systematic comparison of catalase activity and cell viability of wild-type yeast and of the single catalase knockouts, ctt1∆ and cta1∆, following H2O2 challenge in nutrient-rich medium (YPD) and in phosphate buffer (pH 7.4). Ctt1 but not Cta1 activity is strongly induced by H2O2 when cells are challenged in YPD but suppressed when cells are challenged in buffer. Consistent with the activity results, exponentially growing ctt1∆ cells in YPD are more sensitive to H2O2 than wild-type or cta1∆ cells, whereas in buffer all three strains exhibit comparable H2O2 hypersensitivity. Furthermore, catalase activity is increased during adaptation to sublethal H2O2 concentrations in YPD but not in buffer. We conclude that induction of cytosolic Ctt1 activity is vital in protecting yeast against exogenous H2O2 but this activity is inhibited by H2O2 when cells are challenged in nutrient-free media.
| Divisions: | Concordia University > Faculty of Arts and Science > Chemistry and Biochemistry |
|---|---|
| Item Type: | Article |
| Refereed: | Yes |
| Authors: | Martins, Dorival and English, Ann M. |
| Journal or Publication: | Redox Biology |
| Date: | 2014 |
| Digital Object Identifier (DOI): | 10.1016/j.redox.2013.12.019 |
| Keywords: | Catalase activity Yeast Peroxide challenge Cell viability Culture medium |
| ID Code: | 985140 |
| Deposited By: | MIA MASSICOTTE |
| Deposited On: | 28 May 2019 14:13 |
| Last Modified: | 29 May 2019 12:44 |
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