Quantitative proteomic analysis reveals Ga(III) polypyridyl catecholate complexes disrupt Aspergillus fumigatus...

Area of Science:

• Mycology
• Medicinal Chemistry
• Proteomics

Background:

• Infections by Aspergillus fumigatus are increasing in severity.
• Antifungal drug resistance is a growing challenge in treating these infections.
• Gallium (Ga(III)) shows antimicrobial potential by mimicking iron (Fe(III)) and disrupting iron-dependent pathways.

Purpose of the Study:

• To assess the in vitro activity and proteomic effects of a novel heteroleptic Ga(III) polypyridyl catecholate compound against Aspergillus fumigatus.
• To investigate the potential of gallium compounds as a therapeutic strategy against fungal infections.

Main Methods:

• In vitro antifungal activity assays were performed.
• Proteomic analysis was conducted to identify changes in protein abundance.
• A recently reported heteroleptic Ga(III) polypyridyl catecholate compound was tested.

Main Results:

• The Ga(III) compound demonstrated significant growth inhibition of Aspergillus fumigatus.
• Proteomic analysis revealed elevated levels of proteins involved in DNA replication/repair, lipid metabolism, and oxidative stress response.
• A notable decrease in the abundance of mitochondrial proteins was observed, suggesting disruption of respiration.

Conclusions:

• The tested Ga(III) compound exhibits promising antifungal activity against Aspergillus fumigatus.
• Disruption of mitochondrial respiration via gallium compounds may represent a viable therapeutic strategy.
• Further research into gallium-based antifungals is warranted for drug-resistant fungal infections.