Fungal cell surface and mitochondrial membranes

Fungal cell surface and mitochondrial membranes are essential structural components that serve as primary targets for several classes of antifungal medications. The fungal plasma membrane is uniquely characterized by the presence of ergosterol, which maintains membrane fluidity and serves as the primary binding site for polyene antifungals like Amphotericin B [1, 3]. Upon binding, these drugs create aqueous pores that cause the rapid leakage of essential ions, such as potassium, leading to cell death. Beyond the cell surface, the mitochondrial membranes are vital for fungal bioenergetics and are increasingly recognized as secondary or primary targets for agents that induce oxidative stress or disrupt the mitochondrial membrane potential [2]. While these membranes offer selective targets due to differences between fungal ergosterol and mammalian cholesterol, the inherent similarities between eukaryotic membranes can lead to significant clinical toxicities, particularly affecting renal function [3].

Other names

Fungal plasma membraneFungal mitochondrial membraneErgosterol-containing membranesFungal lipid bilayer

Polyene antifungals bind to ergosterol in the fungal cell surface membrane, forming pores that cause ion leakage (e.g., K+, Mg2+) and cell death [1, 3]. Some agents also disrupt the mitochondrial membrane potential, leading to the accumulation of reactive oxygen species (ROS) and induction of apoptosis [1, 2]. Ciclopirox interferes with mitochondrial transmembrane potential and inhibits metal-dependent enzymes [4].