Bacterial cell membrane lipids and associated proteins

The bacterial cell membrane is a fundamental structure composed of a phospholipid bilayer and a diverse array of integral and peripheral proteins (Sohlenkamp & Geiger, 2016, FEMS Microbiology Reviews). It serves as a selective permeability barrier, maintaining the electrochemical gradient necessary for ATP synthesis and regulating the transport of nutrients and waste (Strahl & Hamoen, 2010, Proceedings of the National Academy of Sciences). Unlike eukaryotic membranes, bacterial membranes are rich in anionic lipids such as phosphatidylglycerol and cardiolipin, and in Gram-negative bacteria, the outer membrane contains lipopolysaccharides (Epand et al., 2016, Biochimica et Biophysica Acta). These unique chemical signatures make the membrane an ideal target for antimicrobial agents like daptomycin and polymyxins, which selectively disrupt bacterial integrity over host cells (Seydlová & Svobodová, 2008, Folia Microbiologica). Beyond structural roles, the membrane anchors essential enzymes for cell wall synthesis and machinery for protein secretion, making its disruption lethal to the pathogen (Typas et al., 2011, Nature Reviews Microbiology). However, therapeutic targeting is often limited by toxicity concerns, particularly nephrotoxicity, due to the high doses sometimes required to overcome resistance or reach the site of infection (Poirel et al., 2017, Clinical Microbiology Reviews).

Other names

Bacterial cytoplasmic membraneBacterial inner membraneBacterial lipid bilayerBacterial cell envelope components

Drugs targeting this complex typically act by binding to specific lipid moieties, such as Lipid II, phosphatidylglycerol, or Lipid A, to cause membrane depolarization, pore formation, or physical disruption of the bilayer (Malanovic & Lohner, 2016, Pharmaceuticals). This leads to the rapid leakage of intracellular ions and metabolites, resulting in the cessation of macromolecular synthesis and eventual cell death (Silverman et al., 2003, Antimicrobial Agents and Chemotherapy).