Bacterial membrane anionic lipids

Bacterial membrane anionic lipids, primarily phosphatidylglycerol (PG) and cardiolipin (CL), are essential structural and functional components of the bacterial cytoplasmic membrane (Epand et al., 2016, Biochimica et Biophysica Acta). Unlike the plasma membranes of mammalian cells, which are predominantly composed of zwitterionic lipids like phosphatidylcholine on their outer leaflet, bacterial membranes maintain a high density of these negatively charged lipids (Houtkooper & Vaz, 2008, FEBS Letters). This fundamental biochemical difference provides a basis for the selective toxicity of many antimicrobial agents, including lipopeptides and cationic antimicrobial peptides (Straus & Hancock, 2006, Biochimica et Biophysica Acta). These lipids are involved in critical cellular processes such as the regulation of membrane fluidity, the anchoring of peripheral membrane proteins, and the coordination of cell division and bioenergetics (Mileykovskaya & Dowhan, 2009, Journal of Biological Chemistry). Drugs like daptomycin specifically require the presence of phosphatidylglycerol to insert into the membrane, where they cause rapid depolarization and cell death (Muller et al., 2016, PNAS). However, because cardiolipin is also a key component of eukaryotic mitochondrial membranes, therapeutic strategies must account for potential off-target effects and host toxicity (Paradies et al., 2014, Advances in Bioscience and Biotechnology).

Other names

Bacterial anionic phospholipidsAcidic phospholipidsPhosphatidylglycerolCardiolipin

Drugs targeting these lipids typically utilize electrostatic attraction to bind to the negatively charged headgroups, followed by hydrophobic insertion into the membrane core, which causes rapid depolarization, ion leakage, and disruption of essential membrane-bound processes (Muller et al., 2016, PNAS; Straus & Hancock, 2006, Biochimica et Biophysica Acta).