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Mol Microbiol. 2016 Jul;101(1):92-108. doi: 10.1111/mmi.13377. Epub 2016 May 3.

The hypoxia-induced dehydrogenase HorA is required for coenzyme Q10 biosynthesis, azole sensitivity and virulence of Aspergillus fumigatus.

Author information

1
Department of Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute (HKI), Jena, Germany.
2
Research Group Microbial Immunology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute (HKI), Jena, and Friedrich Schiller University Jena, Jena, Germany.
3
Transfer Group Anti-Infectives, Leibniz Institute for Natural Product Research and Infection Biology (HKI), Jena, Germany.
4
Department of Microbiology and Molecular Biology, Institute of Microbiology, Friedrich Schiller University, Jena, Germany.
5
Research Group Systems Biology and Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute (HKI), Jena, and Friedrich Schiller University Jena, Jena, Germany.

Abstract

Aspergillus fumigatus is the predominant airborne pathogenic fungus causing invasive aspergillosis in immunocompromised patients. During infection A. fumigatus has to adapt to oxygen-limiting conditions in inflammatory or necrotic tissue. Previously, we identified a mitochondrial protein to be highly up-regulated during hypoxic adaptation. Here, this protein was found to represent the novel oxidoreductase HorA. In Saccharomyces cerevisiae a homologue was shown to play a role in biosynthesis of coenzyme Q. Consistently, reduced coenzyme Q content in the generated ΔhorA mutant indicated a respective function in A. fumigatus. Since coenzyme Q is involved in cellular respiration and maintaining cellular redox homeostasis, the strain ΔhorA displayed an impaired response to both oxidative and reductive stress, a delay in germination and an accumulation of NADH. Moreover, an increased resistance against antifungal drugs was observed. All phenotypes were completely reversed by the addition of the synthetic electron carrier menadione. The deletion strain ΔhorA showed significantly attenuated virulence in two murine infection models of invasive pulmonary aspergillosis. Therefore, the biosynthesis of coenzyme Q and, particularly, the fungal-specific protein HorA play a crucial role in virulence of A. fumigatus. Due to its absence in mammals, HorA might represent a novel therapeutic target against fungal infections.

PMID:
26991818
DOI:
10.1111/mmi.13377
[Indexed for MEDLINE]
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