Abstract
Yeast cells exposed to adverse conditions employ a number of defense mechanisms in order to respond effectively to the stress effects of reactive oxygen species. In this work, the cellular response of Yarrowia lipolytica and Pichia pastoris to the exposure to the ROS-inducing agents’ paraquat, hydrogen peroxide, and increased air pressure was analyzed. Yeast cells at exponential phase were exposed for 3 h to 1 mM paraquat, to 50 mM H2O2, or to increased air pressure of 3 or 5 bar. For both strains, the cellular viability loss and lipid peroxidation was lower for the cells exposed to increased air pressure than for those exposed to chemical oxidants. The glutathione induction occurred only in Y. lipolytica strain and reached the highest level as a response to PQ exposure. In general, antioxidant enzymes were more expressed in Y. lipolytica than in P. pastoris. The enzyme superoxide dismutase was induced in both strains under all the oxidant conditions but was dependent on the cellular growth phase, being undetectable in non-growing cells, whereas glutathione reductase was more induced in those conditions. Hydrogen peroxide was the most efficient inducer of catalase. Both yeast cultures underwent no cellular growth inhibition with increased air pressure, indicating that these yeast species were able to adapt to the oxidative stressful environment.
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The authors acknowledge the financial support provided by “Fundação para a Ciência e Tecnologia” (Grant SFRH/BD/47371/2008).
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Lopes, M., Mota, M. & Belo, I. Comparison of Yarrowia lipolytica and Pichia pastoris Cellular Response to Different Agents of Oxidative Stress. Appl Biochem Biotechnol 170, 448–458 (2013). https://doi.org/10.1007/s12010-013-0205-3
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DOI: https://doi.org/10.1007/s12010-013-0205-3