Fungal thiol-containing and metal-dependent enzymes

Fungal thiol-containing and metal-dependent enzymes represent a diverse group of proteins essential for fungal viability, growth, and virulence. This category includes heme-thiolate enzymes like lanosterol 14-alpha demethylase (CYP51), which is critical for ergosterol biosynthesis, as well as various metal-dependent enzymes such as catalases, peroxidases, and cytochromes that require metal cofactors like iron, zinc, or copper for catalytic activity (Subramanian et al., 2020, Journal of Fungi). Thiol-containing enzymes, such as thioredoxin reductase, play a vital role in maintaining the cellular redox balance and protecting the fungus from oxidative stress (Missall et al., 2004, Eukaryotic Cell). Drugs like ciclopirox exert antifungal effects by chelating polyvalent metal cations, thereby depriving these enzymes of necessary cofactors, while azole antifungals specifically target the heme-thiolate moiety of CYP51 (Niewerth et al., 2003, Journal of Antimicrobial Chemotherapy). Because many of these enzymes have human homologs, therapeutic strategies often focus on exploiting structural differences to achieve selectivity and minimize host toxicity (Odds et al., 2003, Lancet Infectious Diseases). Overall, these enzymes are critical nodes in fungal physiology, making them attractive yet complex targets for antimicrobial drug development (StatPearls, 2023).

Other names

Fungal metalloenzymesThiol-dependent fungal enzymesMetal-ion dependent fungal proteinsHeme-thiolate fungal enzymes

Inhibition of enzyme activity via metal ion chelation, covalent modification of active-site cysteine residues, or competitive inhibition of the heme-thiolate active site.