Microbial lipid membranes and envelopes

Microbial lipid membranes and envelopes are essential structural components that define the boundary of bacteria, fungi, and enveloped viruses. In bacteria, the cytoplasmic membrane is a phospholipid bilayer that maintains the electrochemical gradient necessary for ATP synthesis and nutrient transport (StatPearls: Daptomycin). Fungal membranes are characterized by the presence of ergosterol, which provides structural integrity and serves as a primary target for polyene antifungals like Amphotericin B (StatPearls: Amphotericin B). Enveloped viruses possess a lipid bilayer derived from the host cell membrane, which protects the viral genome and facilitates fusion with host cells. Drugs targeting these structures typically act through non-specific physical mechanisms, such as the formation of transmembrane pores or detergent-like solubilization of lipids, leading to rapid loss of cellular contents and cell death (Nature Reviews Microbiology: Antimicrobial peptides). While highly effective against multi-drug resistant pathogens, these agents often face challenges regarding selectivity, as high concentrations can lead to cross-reactivity with mammalian membranes, resulting in clinical toxicities such as nephrotoxicity or neurotoxicity (StatPearls: Polymyxin B).

Other names

Bacterial cytoplasmic membraneViral lipid envelopeFungal plasma membraneMicrobial lipid bilayerPathogen membrane

Physical disruption of the lipid bilayer, formation of transmembrane pores, and dissipation of the electrochemical gradient (depolarization) leading to leakage of essential intracellular components and cell death.