Microbial cytoplasmic membrane

The microbial cytoplasmic membrane is a lipid bilayer structure primarily composed of phospholipids and proteins, encasing the interior of prokaryotic cells and acting as a barrier with selective permeability. It is the site of critical processes, such as nutrient uptake, waste export, energy generation (via electron transport chains or photosynthesis, depending on the organism), and protein localization for cell division and morphogenesis. Its unique lipid composition and absence of cholesterol distinguish it from mammalian membranes, providing a basis for selective targeting by antibiotics. Membrane-active drugs can depolarize or disrupt this membrane, offering broad-spectrum bactericidal activity and the ability to kill dormant or biofilm-associated bacteria. These properties make the microbial cytoplasmic membrane a validated therapeutic target, though care must be taken to avoid off-target toxicity and resistance development.

Other names

bacterial cytoplasmic membraneplasma membraneinner membrane (especially in Gram-negative bacteria)

Disruption/depolarization of the membrane potential (daptomycin, DCAP, polymyxins) Destabilization of membrane structure and integrity, leading to cell death Insertion of hydrophobic domains to disrupt membrane Selective binding to bacterial phospholipids absent in mammalian cells