Fungal cell membrane and mitochondrial membranes

The fungal cell membrane and mitochondrial membranes are essential cellular structures that maintain the viability and metabolic activity of fungal pathogens. The plasma membrane is uniquely characterized by the presence of ergosterol, which regulates fluidity and serves as a docking site for polyene antifungals like amphotericin B (PMID: 23530059). These drugs form aqueous pores in the membrane, causing rapid ion leakage and fungal cell lysis. Simultaneously, the mitochondrial membranes are the site of oxidative phosphorylation, where complexes like the cytochrome bc1 complex are targeted by specific inhibitors to halt energy production (PMID: 28655574). These membrane systems are critical in the pathogenesis of systemic infections such as candidiasis and aspergillosis. While they offer high therapeutic potential due to differences from human cell membranes, the structural similarity between ergosterol and human cholesterol remains a significant source of clinical toxicity, particularly nephrotoxicity. Understanding the biophysical properties of these membranes is vital for developing next-generation antifungals with improved selectivity and reduced side effects.

Other names

Fungal plasma membraneFungal mitochondrial membraneErgosterol-containing membrane

Polyene antifungals bind to ergosterol within the fungal cell membrane, creating transmembrane pores that lead to the leakage of intracellular components like potassium ions, resulting in cell death (PMID: 23530059). Drugs targeting the mitochondrial membrane, such as atovaquone, inhibit the cytochrome bc1 complex, disrupting the electron transport chain and ATP synthesis (PMID: 28655574).