Bacterial outer membrane lipopolysaccharide and phospholipid interface (OM LPS-PL interface)

The bacterial outer membrane lipopolysaccharide and phospholipid interface represents a critical structural and functional boundary in Gram-negative bacteria. This interface is defined by the asymmetric distribution of lipids, where the inner leaflet consists primarily of phospholipids and the outer leaflet is composed of lipopolysaccharides (LPS). This unique architecture creates an exceptionally robust permeability barrier that protects the bacterium from environmental stressors, including many classes of antibiotics. Maintaining this interface requires the coordinated action of the Lipopolysaccharide Transport (Lpt) machinery, which shuttles LPS across the periplasm and inserts it into the outer leaflet. Recent therapeutic breakthroughs, such as the development of Zosurabalstat, specifically target the LptB2FGC complex at this interface to block LPS transport, effectively trapping LPS in the inner membrane and leading to bacterial cell death. Targeting this interface is a highly effective strategy against multidrug-resistant pathogens like Acinetobacter baumannii, as it bypasses traditional resistance mechanisms that affect cell wall synthesis or protein translation.

Other names

Gram-negative outer membrane leaflet interfaceLPS-phospholipid boundaryOuter membrane asymmetric interface

Drugs targeting this interface typically disrupt the transport of lipopolysaccharides (LPS) from the inner membrane to the outer membrane or destabilize the physical boundary between the phospholipid inner leaflet and the LPS outer leaflet, leading to membrane rupture and bacterial cell death.