Bacterial cell wall and cytoplasmic membrane phospholipids

Bacterial cell wall and cytoplasmic membrane phospholipids are fundamental structural and functional components of the bacterial cell envelope. These lipids, including phosphatidylglycerol, phosphatidylethanolamine, and cardiolipin, form the bilayer that maintains the cell's osmotic integrity and serves as a platform for essential biological processes such as cell wall synthesis and protein secretion (Sohlenkamp & Geiger, 2016). In Gram-positive bacteria, the cytoplasmic membrane is directly accessible, whereas in Gram-negative bacteria, phospholipids are found in both the inner membrane and the inner leaflet of the outer membrane. Many potent antibiotics, such as daptomycin and polymyxins, specifically target these phospholipids to disrupt the membrane's physical structure or electrochemical gradient (Straus & Hancock, 2006). This disruption leads to rapid bactericidal activity, making these lipids critical targets for treating resistant bacterial infections. However, the similarity between certain bacterial and mammalian lipids can lead to off-target toxicity, necessitating careful drug design to ensure selectivity.

Other names

Bacterial membrane lipidsBacterial phospholipidsCytoplasmic membrane phospholipids

Binding to phospholipid headgroups or the lipid bilayer leads to membrane depolarization, pore formation, or physical disruption, causing leakage of intracellular contents and cell death (Taylor & Palmer, 2016; Velkov et al., 2013). Some agents also bind to lipid-linked precursors like Lipid II to inhibit cell wall biosynthesis (Sohlenkamp & Geiger, 2016).