Copper Homeostasis and Pathogenicity in Fungal Systems

Copper ions serve essential functions in fungal biology, acting as redox cofactors in enzymes critical for respiration, antioxidant defence and cell wall assembly. Yet the same redox activity that renders copper indispensable also poses a threat through generation of toxic reactive oxygen species. To balance these competing demands, fungi deploy coordinated uptake, distribution, storage and efflux systems. High‐affinity import is mediated by CTR‐family transporters, while P‐type ATPases export excess copper to avoid intracellular overload. Metallochaperones such as Atx1 deliver copper to specific targets, and copper‐responsive transcription factors adjust gene expression according to metal availability. At the host‐pathogen interface, fungal pathogens must wrestle with nutritional immunity: the host both starves invaders of copper and, in phagolysosomes, bombards them with toxic copper concentrations. Effective copper homeostasis underpins virulence traits including morphogenetic transitions, biofilm formation and resistance to oxidative bursts. Emerging work highlights extensive cross‐talk between copper and other metal networks (iron, zinc), reflecting the global intricacy of micronutrient management. Understanding these mechanisms reveals vulnerabilities that could be exploited in novel antifungal strategies, from inhibitors of copper import to agents that potentiate host‐imposed copper toxicity.

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Copper Homeostasis and Pathogenicity in Fungal Systems publication trend

The graph below shows the total number of articles in copper homeostasis and pathogenicity in fungal systems across all publications each year (not limited to Nature Index journals).

Technical terms

Copper homeostasis: Cellular mechanisms that control copper uptake, distribution, storage and efflux to balance essential functions and avoid toxicity.

Metallochaperone: A protein, such as Atx1, that binds copper ions and delivers them to specific targets to prevent free copper–induced damage.

P‐type ATPase: A family of membrane proteins that use ATP hydrolysis to transport copper out of the cytosol across membranes.

Superoxide dismutase (SOD): An enzyme requiring copper (and/or zinc, manganese) that catalyses conversion of superoxide radicals into oxygen and hydrogen peroxide, mitigating oxidative stress.

CTR transporter: Members of the Ctr family mediate high‐affinity copper import at the plasma membrane.

Nutritional immunity: Host strategies to withhold or overload essential micronutrients such as copper to inhibit microbial pathogens.

Conidiation: Asexual spore formation in filamentous fungi, controlled by regulatory genes like brlA and its orthologues.

Endoplasmic reticulum retention: A phenomenon where proteins misfolded or lacking sorting signals accumulate in the ER, impairing their cellular function.

References

1. Identification and Analysis of Fungal-Specific Regions in the Aspergillus fumigatus Cu Exporter CrpA That Are Essential for Cu Resistance but Not for Virulence. International Journal of Molecular Sciences (2023).
2. Trace copper-mediated asexual development via a superoxide dismutase and induction of AobrlA in Aspergillus oryzae. Frontiers in Microbiology (2023).
3. Molecular Interactions of the Copper Chaperone Atx1 of Paracoccidioides brasiliensis with Fungal Proteins Suggest a Crosstalk between Iron and Copper Homeostasis. Microorganisms (2023).
4. The Role of Copper Homeostasis at the Host-Pathogen Axis: From Bacteria to Fungi. International Journal of Molecular Sciences (2019).