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Molecules 2016, 21(9), 1118; doi:10.3390/molecules21091118

Adaptive Responses to Oxidative Stress in the Filamentous Fungal Shiraia bambusicola

The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, Jiangsu, China
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Academic Editor: Tobias A. M. Gulder
Received: 30 June 2016 / Revised: 1 August 2016 / Accepted: 19 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Biosynthesis of Natural Products)
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Abstract

Shiraia bambusicola can retain excellent physiological activity when challenged with maximal photo-activated hypocrellin, which causes cellular oxidative stress. The protective mechanism of this fungus against oxidative stress has not yet been reported. We evaluated the biomass and hypocrellin biosynthesis of Shiraia sp. SUPER-H168 when treated with high concentrations of H2O2. Hypocrellin production was improved by nearly 27% and 25% after 72 h incubation with 10 mM and 20 mM H2O2, respectively, while the inhibition ratios of exogenous 20 mM H2O2 on wild S. bambusicola and a hypocrellin-deficient strain were 20% and 33%, respectively. Under exogenous oxidative stress, the specific activities of catalase, glutathione reductase, and superoxide dismutase were significantly increased. These changes may allow Shiraia to maintain normal life activities under oxidative stress. Moreover, sufficient glutathione peroxidase was produced in the SUPER-H168 and hypocrellin-deficient strains, to further ensure that S. bambusicola has excellent protective abilities against oxidative stress. This study creates the possibility that the addition of high H2O2 concentrations can stimulate fungal secondary metabolism, and will lead to a comprehensive and coherent understanding of mechanisms against oxidative stresses from high hydrogen peroxide concentrations in the filamentous fungal Shiraia sp. SUPER-H168. View Full-Text
Keywords: oxidative stress; adaptive responses; hypocrellin biosynthesis; hydrogen peroxide; Shiraia bambusicola; filamentous fungi oxidative stress; adaptive responses; hypocrellin biosynthesis; hydrogen peroxide; Shiraia bambusicola; filamentous fungi
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MDPI and ACS Style

Deng, H.; Chen, J.; Gao, R.; Liao, X.; Cai, Y. Adaptive Responses to Oxidative Stress in the Filamentous Fungal Shiraia bambusicola. Molecules 2016, 21, 1118.

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