Bacterial cell membrane and associated anionic surface components

The bacterial cell membrane and its associated anionic surface components represent a vital structural assembly essential for bacterial survival, serving as a selective barrier and a platform for metabolic processes. This target includes the cytoplasmic membrane's phospholipid bilayer—rich in anionic lipids like phosphatidylglycerol (PG) and cardiolipin—and surface elements such as lipopolysaccharides (LPS) in Gram-negative bacteria or teichoic acids in Gram-positive bacteria (Sohlenkamp & Geiger, 2016, "Bacterial membrane lipids: diversity in structures and pathways"). These components facilitate critical functions including the maintenance of the electrochemical gradient, nutrient transport, and cell wall synthesis (Straus & Hancock, 2006, "Mode of action of host defence peptides"). Antimicrobial agents like daptomycin and polymyxins specifically target these anionic structures to disrupt membrane integrity, leading to rapid depolarization, ion leakage, and cell death (Heidary et al., 2017, "Daptomycin: A review of properties, clinical use, and drug resistance"). Because mammalian membranes are primarily composed of zwitterionic phospholipids and cholesterol, these drugs exhibit a degree of selectivity for bacterial cells (Silver, 2011, "Challenges of Antibacterial Discovery"). However, therapeutic use is often limited by potential toxicities, such as nephrotoxicity or myopathy, and the emergence of resistance through bacterial surface charge modification (Munn et al., 2021, "Mechanisms of Bacterial Resistance to Membrane-Disrupting Antibiotics").

Other names

Bacterial cytoplasmic membraneBacterial plasma membraneAnionic phospholipidsBacterial lipid bilayerBacterial cell envelope anionic components

Binding to anionic membrane components (e.g., phosphatidylglycerol or Lipid A) leading to membrane depolarization, increased permeability, and loss of intracellular ions, resulting in the cessation of macromolecular synthesis and cell death (Heidary et al., 2017; Trimble et al., 2016).