Microbial cell membrane lipid bilayer

The **microbial cell membrane lipid bilayer** is a continuous, double-layered structure composed primarily of amphiphilic phospholipid molecules, serving as the primary permeability barrier that delineates the cytoplasm from the extracellular environment in microbes[1][2][3][4][6]. This bilayer is stabilized by hydrophobic interactions among fatty acid tails and hydrophilic interactions among lipid head groups, conferring selective permeability critical for microbial survival and function. It supports a range of embedded membrane proteins (such as transporters, enzymes, and sensory molecules) essential for nutrient uptake, environmental sensing, energy transduction, and secretion[2][4][5][6]. In bacteria, the lipid composition is distinct—mainly phosphatidylethanolamine, phosphatidylglycerol, and cardiolipin—often without sterols (except in some mycoplasmas and fungi)[5]. The microbial cell membrane lipid bilayer is a validated therapeutic target for antimicrobials aiming to disrupt structural integrity, cause leakage of cellular contents, and trigger cell death; drugs like **polymyxins** and **daptomycin** exert their effects by interacting directly with the bilayer[5]. However, targeting the microbial lipid bilayer risks toxicity to host cells and the development of resistance through lipid modification and upregulation of efflux mechanisms. The overall architecture also plays vital roles in infection biology, immune evasion, and pathogen-host interactions.

Other names

Microbial plasma membrane lipid bilayerBacterial cell membrane lipid bilayerProkaryotic cell membrane lipid bilayerPhospholipid bilayer (in the bacterial context)Cell membrane lipid bilayer (microbial)

Direct disruption of lipid bilayer integrity (membrane lysis); Pore formation leading to cell leakage; Increased membrane permeability to ions/water; Inhibition of membrane-associated transporters/proteins; Interference with membrane protein-lipid interactions