Abstract
Most eukaryotes require molecular oxygen for growth. In general, oxygen is the terminal electron acceptor of the respiratory chain and represents an important substrate for the biosynthesis of cellular compounds. However, in their natural environment, such as soil, and also during the infection, filamentous fungi are confronted with low levels of atmospheric oxygen. Transcriptome and proteome studies on the hypoxic response of filamentous fungi revealed significant alteration of the gene expression and protein synthesis upon hypoxia. These analyses discovered not only common but also species-specific responses to hypoxia with regard to NAD+ regeneration systems and other metabolic pathways. A surprising outcome was that the induction of oxidative and nitrosative stress defenses during oxygen limitation represents a general trait of adaptation to hypoxia in many fungi. The interplay of these different stress responses is poorly understood, but recent studies have shown that adaptation to hypoxia contributes to virulence of pathogenic fungi. In this review, results on metabolic changes of filamentous fungi during adaptation to hypoxia are summarized and discussed.
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Acknowledgments
Work in the authors’ lab was supported by funding from the Leibniz-Association, the International Leibniz Research School (ILRS) for Microbial and Biomolecular Interactions as part of the DFG-funded excellence graduate school Jena School for Microbial Communication (JSMC), the German-Israeli Foundation for Scientific Research and Development (GIF No. 996-47.12/2008), and the ERA-Net Pathogenomics project “OXYstress” (BMBF project number 0315902B). We wish to thank Alene Alder-Rangel who helped to improve this manuscript. This review article was supported in part by a grant from State of São Paulo Research Foundation (FAPESP)# 2014/01229-4.
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Communicated by D.E.N. Rangel.
This article is part of the Special Issue “Fungal Stress Responses”.
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Hillmann, F., Shekhova, E. & Kniemeyer, O. Insights into the cellular responses to hypoxia in filamentous fungi. Curr Genet 61, 441–455 (2015). https://doi.org/10.1007/s00294-015-0487-9
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DOI: https://doi.org/10.1007/s00294-015-0487-9