Lipid II and bacterial cell membrane (Lipid II)

Lipid II is a vital, highly conserved peptidoglycan precursor essential for the synthesis of the bacterial cell wall. It consists of a hydrophilic MurNAc-pentapeptide-GlcNAc headgroup linked via a pyrophosphate bridge to a hydrophobic C55-undecaprenyl lipid carrier, which facilitates the transport of cell wall building blocks across the cytoplasmic membrane (Münch & Sahl, 2015). Because Lipid II is present in limited quantities and is accessible on the outer leaflet of the cytoplasmic membrane, it serves as a high-affinity target for several classes of antibiotics, including glycopeptides and lantibiotics (Grein et al., 2020). Drugs targeting Lipid II, such as vancomycin, typically sequester the molecule to prevent its utilization by transglycosylases, thereby halting cell wall assembly and leading to bacterial lysis. Furthermore, certain advanced or natural antibiotics like teixobactin and nisin exhibit a dual mechanism of action: they bind to Lipid II and simultaneously insert into or disrupt the pathogen's cell membrane, causing rapid depolarization and loss of membrane integrity (Ling et al., 2015; Shukla et al., 2020). This combined approach of inhibiting structural synthesis while physically compromising the membrane makes Lipid II an exceptionally robust target for treating multi-drug resistant Gram-positive infections.

Other names

Undecaprenyl-pyrophosphoryl-MurNAc-(pentapeptide)-GlcNAcBacterial cell wall precursorBacterial cytoplasmic membranePeptidoglycan precursor Lipid II

Inhibition of peptidoglycan synthesis by binding to the D-Ala-D-Ala terminus or pyrophosphate moiety of Lipid II, and disruption of bacterial membrane potential or pore formation.