Bacterial cell membrane phospholipids and anionic cell surface components

Bacterial cell membrane phospholipids and anionic cell surface components are fundamental structural elements that maintain the integrity and functionality of the bacterial cell envelope. These components include phospholipids such as phosphatidylglycerol and cardiolipin, as well as anionic polymers like lipopolysaccharides (LPS) in Gram-negative bacteria and teichoic acids in Gram-positive bacteria (PMID: 24613910, PMID: 24511106). They play a crucial role in establishing a permeability barrier, regulating ion homeostasis, and providing a scaffold for membrane-associated proteins. Because these components are often negatively charged, they serve as primary targets for cationic antimicrobial peptides and lipopeptide antibiotics. For instance, daptomycin targets phosphatidylglycerol in a calcium-dependent manner to cause membrane depolarization, while polymyxins bind to the Lipid A moiety of LPS to disrupt the outer membrane of Gram-negative pathogens (PMID: 27048815). These interactions lead to rapid loss of membrane potential or physical rupture, resulting in bacterial cell death. Consequently, these surface components are vital targets in the development of treatments for severe and multi-drug resistant bacterial infections.

Other names

Bacterial cell membraneBacterial phospholipidsAnionic cell surface componentsLipopolysaccharideLPSTeichoic acidsPhosphatidylglycerolCardiolipinBacterial cell envelope components

Membrane depolarization, pore formation, and disruption of the outer membrane through binding to anionic lipids or lipopolysaccharides.