Microbial cell membrane and associated surface components

The microbial cell membrane and its associated surface components represent a critical structural and functional barrier for bacteria, fungi, and protozoa. This complex assembly, primarily composed of a phospholipid bilayer interspersed with proteins, lipopolysaccharides, and sterols, is essential for maintaining cellular homeostasis, nutrient transport, and energy production via the electron transport chain [1][2]. Because these structures often contain components distinct from human cells—such as ergosterol in fungi or lipid A in bacteria—they serve as primary targets for various antimicrobial classes [3]. Drugs like polymyxins and daptomycin act by physically disrupting membrane integrity or causing rapid depolarization, leading to cell death [4]. Amphotericin B specifically targets fungal membranes by binding to ergosterol and forming lethal pores [5]. However, the broad nature of this target category and the potential for cross-reactivity or systemic toxicity, such as nephrotoxicity, present significant therapeutic challenges [6]. Understanding the specific molecular interactions at the microbial surface remains vital for overcoming emerging antimicrobial resistance [7].

Other names

Bacterial cell membraneFungal cell membraneMicrobial cell envelopeCytoplasmic membraneBacterial cytoplasmic membrane

Drugs targeting these components typically act through membrane permeabilization, pore formation, or depolarization of the cytoplasmic membrane, leading to the leakage of essential intracellular contents and rapid cell death.