Microbial cell membrane and cell wall lipids

Microbial cell membrane and cell wall lipids are essential structural and functional molecules that define the boundary and integrity of bacteria and fungi. In bacteria, specific lipids such as Lipid II serve as vital intermediates in the synthesis of the peptidoglycan cell wall, while lipopolysaccharides (LPS) are critical for the outer membrane stability of Gram-negative bacteria (Schneider & Sahl, 2010, Nature Reviews Microbiology). In fungi, ergosterol is the primary sterol responsible for maintaining membrane fluidity and permeability, distinguishing fungal cells from mammalian cells which utilize cholesterol (Mesa-Arango et al., 2012, Frontiers in Microbiology). These lipids are crucial for pathogen survival, environmental protection, and virulence during infection. Therapeutic agents target these lipids to achieve rapid bactericidal or fungicidal effects; for example, polymyxins bind to LPS to disrupt Gram-negative membranes, and daptomycin targets phosphatidylglycerol in Gram-positive bacteria to cause membrane depolarization (Heidary et al., 2022, Frontiers in Microbiology). Because many of these lipid targets are unique to microbes, they provide a basis for selective toxicity, although challenges such as nephrotoxicity remain due to high-dose requirements or off-target effects.

Other names

Bacterial membrane lipidsFungal membrane lipidsLipid IIErgosterolLipopolysaccharideLPSPhosphatidylglycerolCardiolipinLipid A

Direct binding to specific lipid species (e.g., Lipid II, LPS, ergosterol) leading to membrane depolarization, pore formation, or inhibition of cell wall polymer assembly.