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Published on: March 9, 2018
Fungal iron homeostasis with a focus on Aspergillus fumigatus
Matthias Misslinger1, Peter Hortschansky2, Axel A Brakhage3
1Institute of Molecular Biology - Biocenter, Medical University of Innsbruck, Innsbruck, Austria.
Abstract:
To maintain iron homeostasis, fungi have to balance iron acquisition, storage, and utilization to ensure sufficient supply and to avoid toxic excess of this essential trace element. As pathogens usually encounter iron limitation in the host niche, this metal plays a particular role during virulence. Siderophores are iron-chelators synthesized by most, but not all fungal species to sequester iron extra- and intracellularly. In recent years, the facultative human pathogen Aspergillus fumigatus has become a model for fungal iron homeostasis of siderophore-producing fungal species. This article summarizes the knowledge on fungal iron homeostasis and its links to virulence with a focus on A. fumigatus. It covers mechanisms for iron acquisition, storage, and detoxification, as well as the modes of transcriptional iron regulation and iron sensing in A. fumigatus in comparison to other fungal species. Moreover, potential translational applications of the peculiarities of fungal iron metabolism for treatment and diagnosis of fungal infections is addressed.
Insights
Fungi balance iron for health and virulence, using siderophores to manage this essential metal. Understanding fungal iron metabolism in Aspergillus fumigatus offers insights for treating infections.
Area of Science:
- Mycology
- Molecular Biology
- Pathogenesis
Background:
- Fungi require precise iron regulation for survival and virulence.
- Iron limitation is common in host environments, impacting fungal pathogens.
- Siderophores are key iron-chelating molecules produced by many fungi.
Purpose of the Study:
- To review fungal iron homeostasis mechanisms.
- To highlight the role of iron in fungal virulence, focusing on Aspergillus fumigatus.
- To explore translational applications of fungal iron metabolism.
Main Methods:
- Literature review and synthesis of current research on fungal iron metabolism.
- Comparative analysis of iron acquisition, storage, and regulation in Aspergillus fumigatus and other fungi.
- Discussion of iron sensing and detoxification pathways.
Main Results:
- Aspergillus fumigatus serves as a model for studying siderophore-mediated iron uptake.
- Fungal iron homeostasis is intricately linked to virulence.
- Mechanisms of iron regulation, sensing, and detoxification are conserved but show species-specific adaptations.
Conclusions:
- Understanding fungal iron metabolism is crucial for developing novel antifungal strategies.
- Targeting iron acquisition or homeostasis pathways could lead to new treatments for fungal infections.
- Further research into fungal iron metabolism holds diagnostic and therapeutic potential.
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