Bacterial membrane phospholipid

Bacterial membrane phospholipids are fundamental structural units of the bacterial cell envelope that maintain the physical integrity and selective permeability of the cell [5, 13]. These molecules, primarily including phosphatidylglycerol (PG), cardiolipin (CL), and phosphatidylethanolamine (PE), differ significantly from eukaryotic phospholipids in their charge and composition, which facilitates selective therapeutic targeting [12, 17, 18]. They play crucial roles in essential biological functions such as protein anchoring, cell division, and the regulation of membrane fluidity [19, 21, 24]. In the context of infectious diseases, these phospholipids serve as the primary targets for several classes of bactericidal antibiotics, including lipopeptides like daptomycin and polymyxins [2, 11, 14]. These drugs typically interact with the anionic headgroups of the phospholipids to insert into the bilayer, causing rapid membrane depolarization, ion leakage, and eventual cell lysis [7, 9, 11]. Despite their efficacy, targeting membrane phospholipids presents significant therapeutic challenges, including potential nephrotoxicity and neurotoxicity, which often necessitate strict clinical monitoring [3, 8, 22, 25].

Other names

Bacterial membrane lipidBacterial cytoplasmic membrane lipidAnionic bacterial phospholipidPhosphatidylglycerolCardiolipinPhosphatidylethanolamine

Drugs targeting bacterial phospholipids typically bind to the anionic headgroups (often requiring divalent cations like calcium for lipopeptides), leading to membrane insertion, oligomerization, and the formation of pores or ion channels that cause rapid membrane depolarization and leakage of essential intracellular contents [1, 2, 7, 9, 11].