Bacterial plasma membrane lipids

Bacterial plasma membrane lipids are essential structural and functional components of the bacterial cell envelope, providing a semi-permeable barrier that maintains cellular homeostasis and protects against environmental stress [Epand et al., 2016]. Unlike eukaryotic membranes, bacterial membranes are characterized by a high proportion of anionic lipids such as phosphatidylglycerol and cardiolipin, and they typically lack sterols like cholesterol [Sohlenkamp & Geiger, 2016]. These lipids serve as critical targets for several classes of antibiotics, including lipopeptides and glycopeptides. For example, daptomycin binds to phosphatidylglycerol in a calcium-dependent manner, leading to membrane insertion, depolarization, and rapid cell death [Straus & Hancock, 2006]. Other agents, such as polymyxins, target the lipid A component of lipopolysaccharides in Gram-negative bacteria or interact directly with phospholipids to disrupt membrane integrity [Trimble et al., 2016]. Targeting these lipids is a robust strategy for treating multi-drug resistant infections, as the fundamental structural role of lipids makes the evolution of resistance a complex biological challenge.

Other names

Bacterial membrane lipidsBacterial cytoplasmic membrane lipidsBacterial phospholipidsBacterial cell membrane lipids

Drugs targeting bacterial plasma membrane lipids primarily act through membrane disruption, pore formation, and depolarization of the cytoplasmic membrane [Straus & Hancock, 2006]. Lipopeptides like daptomycin aggregate in the membrane to create ion-conducting channels, while polymyxins act as detergents that displace divalent cations from phosphate groups of membrane lipids, leading to increased permeability [Trimble et al., 2016]. Furthermore, some antibiotics bind to lipid-anchored precursors such as Lipid II, thereby inhibiting the biosynthesis of the peptidoglycan layer [Ling et al., 2015].