Mechanisms of copper and zinc homeostasis in pathogenic black fungi

Area of Science:

• Mycology
• Medical Mycology
• Genomics
• Biochemistry

Background:

• Black fungi are melanized microorganisms, some causing human infections like chromoblastomycosis.
• Fungal pathogens must adapt to varying metal concentrations (zinc, copper) in host environments.
• Understanding metal homeostasis is crucial for pathogen survival and host interaction.

Purpose of the Study:

• To perform an in silico analysis of zinc and copper homeostasis in four black fungi genomes.
• To identify genes and regulatory elements involved in metal management within these fungi.
• To explore potential unique adaptations in black fungi related to metal handling.

Main Methods:

• Genome-wide in silico analysis of four selected black fungi species.
• Identification of genes encoding transporters, metal-binding proteins, and transcription factors.
• Comparative analysis of identified genes and regulatory elements with known fungal systems.

Main Results:

• Black fungi share conserved machinery for metal uptake, storage, and detoxification with other fungi.
• Genes for plasma membrane and organelle transporters, and metal-binding proteins were identified.
• Putative zinc and copper-responsive transcription factors were found, but with significant structural differences compared to characterized regulators.

Conclusions:

• Black fungi exhibit unique features in regulating zinc and copper homeostasis, likely linked to their ecological niches.
• These unique adaptations may contribute to the pathogenicity of black fungi.
• The findings provide novel insights into unexplored aspects of black fungi biology relevant to understanding disease mechanisms.