Polyvalent metal cations and downstream metal-dependent fungal enzymes

Polyvalent metal cations, particularly trivalent ions like Fe3+ and Al3+, serve as essential cofactors for a diverse group of downstream metal-dependent fungal enzymes. These enzymes include cytochromes, which are critical for mitochondrial electron transport and energy production, as well as catalases and peroxidases, which protect the fungal cell by degrading toxic peroxides. The therapeutic targeting of these cations and their associated enzymes is the primary mechanism of action for the antifungal drug ciclopirox. By chelating these polyvalent cations, the drug effectively starves the fungal cell of necessary cofactors, leading to the inhibition of vital metabolic processes, DNA repair, and nutrient transport. This multi-target approach results in broad-spectrum activity against dermatophytes, yeasts, and molds. Because it targets multiple essential pathways simultaneously, there is a very low potential for the development of fungal resistance. Clinically, this target is exploited to treat superficial mycoses such as onychomycosis, seborrheic dermatitis, and various forms of tinea.

Other names

Fungal metal-dependent enzymesTrivalent metal cationsPolyvalent cationsFungal metalloenzymesIron-dependent fungal enzymes

Chelation of polyvalent metal cations (primarily Fe3+ and Al3+), which deprives metal-dependent fungal enzymes of essential cofactors, leading to the inhibition of cytochromes, catalases, and peroxidases.