Bacterial cell membrane and associated surface proteins

The bacterial cell membrane is a fundamental phospholipid bilayer that serves as a selective barrier and a scaffold for essential biological processes, including ATP synthesis and nutrient transport (Alberts et al., "Molecular Biology of the Cell"). It is intrinsically linked to associated surface proteins such as penicillin-binding proteins (PBPs), which are crucial for peptidoglycan synthesis and maintaining cell shape (Sauvage et al., 2008, "The penicillin-binding proteins: structure and role in peptidoglycan biosynthesis"). In clinical medicine, this structure is a vital therapeutic target for treating various bacterial infections, ranging from skin infections to life-threatening sepsis (StatPearls, "Antibiotics"). Antibiotics like daptomycin target the membrane by inserting into the bilayer in a calcium-dependent manner, causing rapid depolarization and cell death (PubChem, "Daptomycin"). Polymyxins, such as Colistin, interact with the lipopolysaccharides of Gram-negative bacteria to disrupt membrane integrity (StatPearls, "Polymyxin B"). While highly effective, targeting the bacterial membrane can present safety challenges, including nephrotoxicity and neurotoxicity, due to potential off-target effects or high dosage requirements (PubMed, "Toxicity of Polymyxins").

Other names

Bacterial cytoplasmic membraneBacterial plasma membraneBacterial cell envelopeBacterial surfaceome

Drugs targeting this complex typically act by inducing membrane depolarization, forming transmembrane pores, or inhibiting the activity of surface-associated enzymes like penicillin-binding proteins (PBPs). These actions lead to the leakage of essential intracellular ions, loss of membrane potential, or the cessation of cell wall synthesis, ultimately resulting in rapid bacterial cell death (StatPearls, "Antibiotics"; PubChem, "Daptomycin").