Microbial and fungal cell membrane

The microbial and fungal cell membrane is a fundamental lipid bilayer structure that maintains cellular homeostasis by regulating the transport of ions and nutrients. In bacteria, the cytoplasmic membrane is the site of essential processes such as the electron transport chain and ATP synthesis, while in fungi, the plasma membrane is characterized by the presence of ergosterol, a sterol absent in animal cells (StatPearls, 2023). These membranes serve as vital therapeutic targets because their unique composition allows for selective toxicity against pathogens. For instance, polyene antifungals like amphotericin B bind to ergosterol to form lethal pores, while lipopeptide antibiotics like daptomycin insert into bacterial membranes to cause rapid depolarization (NIH, 2022). Disruption of membrane integrity leads to the leakage of essential cytoplasmic components, resulting in rapid cell death. However, the similarity between certain microbial lipids and human cell components can lead to significant safety concerns, such as the nephrotoxicity associated with polymyxins and polyenes (PubMed, 2021).

Other names

Bacterial cytoplasmic membraneFungal plasma membraneMicrobial lipid bilayerProkaryotic cell membrane

Drugs targeting these membranes typically act through direct membrane disruption via pore formation, depolarization of the membrane potential, or by inhibiting the biosynthesis of essential membrane components like ergosterol, leading to loss of structural integrity and cell lysis (StatPearls, 2023; NIH, 2022).