Bacterial membrane lipid bilayer

The bacterial membrane lipid bilayer is a critical structural component that serves as a selective barrier between the bacterial cytoplasm and the external environment (Nature Reviews Microbiology, 2015). Composed primarily of phospholipids, such as phosphatidylglycerol and cardiolipin, it maintains the essential electrochemical gradient known as the proton motive force, which is vital for ATP synthesis and nutrient transport (PubMed, PMID: 25850671). Unlike eukaryotic membranes, bacterial membranes often lack cholesterol and possess a high proportion of negatively charged lipids, providing a basis for selective drug targeting (StatPearls, 2023). Several classes of antibiotics, including lipopeptides like daptomycin and polymyxins, specifically target this structure to induce membrane depolarization or physical disruption (PubMed, PMID: 24595038). This mechanism is particularly effective against multi-drug resistant pathogens, as the fundamental physical properties of the lipid bilayer are harder for bacteria to alter compared to specific protein binding sites. However, the similarity between bacterial and host cell membranes can lead to significant toxicities, such as nephrotoxicity and neurotoxicity, necessitating careful clinical management (StatPearls, 2023).

Other names

Bacterial cytoplasmic membraneBacterial plasma membraneBacterial inner membraneBacterial cell membrane

Direct disruption of the lipid bilayer integrity, leading to pore formation, leakage of intracellular contents (e.g., potassium ions), and dissipation of the membrane potential (depolarization), which ultimately results in cell death (PubMed, PMID: 24595038; StatPearls, 2023).