Cytoplasmic membrane of bacterial pathogen

The **cytoplasmic membrane of bacterial pathogens** is a fundamental structural component of bacterial cells, composed primarily of a **phospholipid bilayer** with embedded and associated proteins[1][2][3][4][5][6][7]. It serves as the principal permeability barrier, enabling **selective transport** of nutrients into the cell and export of waste products, maintenance of the **proton motive force** for ATP generation, and the localization of essential processes such as respiration, photosynthesis (in photosynthetic bacteria), signal transduction, and cell division[3][4][5][6]. The composition and structure of the membrane can differ between bacterial species, and it is a critical **determinant of bacterial viability**[1][2][4]. However, *the cytoplasmic membrane itself is not a single molecular target but a cellular structure comprising a mosaic of lipids and proteins*, meaning it is not a canonical drug target in the traditional sense. Nevertheless, several antibiotics—most notably polymyxins—exert their effect by **disrupting the integrity of the bacterial cytoplasmic membrane**, leading to cell death. **Targeting the membrane presents therapeutic challenges**, including toxicity and the potential for resistance mutations that alter lipid composition[2][3][7]. Because of its essential role in bacterial survival, the cytoplasmic membrane is considered an *indirect but crucial structure in antibiotic therapy*, but calling it a "therapeutic target" is conceptually imprecise compared to a specific protein or enzyme[1][5][7]. This entry is **not a canonical single molecular target**—it refers to a whole cellular structure rather than a well-defined molecule, which can create ambiguity or imprecision if used as a target name in drug discovery contexts.

Other names

Bacterial cytoplasmic membraneBacterial plasma membraneProkaryotic cytoplasmic membraneBacterial inner membrane (especially for Gram-negative bacteria)

Disruption of membrane integrity (polymyxins displace cations and disrupt lipid packing, causing cell lysis); Depolarization of membrane potential (daptomycin binds membrane and induces ion leakage)