Abstract
Ashbya gossypii is a plant pathogen and a natural overproducer of riboflavin and is used for industrial riboflavin production. A few literature reports depict a link between riboflavin overproduction and stress in this fungus. However, the stress protection mechanisms and glutathione metabolism are not much explored in A. gossypii. In the present study, an increase in the activity of catalase and superoxide dismutase was observed in response to hydrogen peroxide and menadione. The lipid peroxide and membrane lipid peroxide levels were increased by H2O2 and menadione, indicating oxidative damage. The glutathione metabolism was altered with a significant increase in oxidized glutathione (GSSG), glutathione peroxidase (GPX), glutathione S transferase (GST), and glutathione reductase (GR) and a decrease in reduced glutathione (GSH) levels in the presence of H2O2 and menadione. Expression of the genes involved in stress mechanism was analyzed in response to the stressors by semiquantitative RT-PCR. The messenger RNA (mRNA) levels of CTT1, SOD1, GSH1, YAP1, and RIB3 were increased by H2O2 and menadione, indicating the effect of stress at the transcriptional level. A preliminary bioinformatics study for the presence of stress response elements (STRE)/Yap response elements (YRE) depicted that the glutathione metabolic genes, stress genes, and the RIB genes hosted either STRE/YRE, which may enable induction of these genes during stress.
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The authors would like to acknowledge IIT Madras and the Department of Science and Technology, India, for the funds provided under the WOS-A scheme, which was useful to conduct the present work.
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Kavitha, S., Chandra, T.S. Oxidative Stress Protection and Glutathione Metabolism in Response to Hydrogen Peroxide and Menadione in Riboflavinogenic Fungus Ashbya gossypii . Appl Biochem Biotechnol 174, 2307–2325 (2014). https://doi.org/10.1007/s12010-014-1188-4
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DOI: https://doi.org/10.1007/s12010-014-1188-4