Bacterial cytoplasmic membrane phospholipid bilayer

The bacterial cytoplasmic membrane is a fundamental phospholipid bilayer that separates the cytoplasm from the external environment or the periplasm (Source: PMID: 25611371). It plays a critical role in maintaining the electrochemical gradient, facilitating nutrient transport, and anchoring proteins involved in cell wall synthesis and energy production. Many antimicrobial agents, such as lipopeptides and polymyxins, target this structure by inducing channel formation or physical disruption of the bilayer (Source: PMID: 28130388). This process leads to the rapid efflux of essential ions like potassium, resulting in membrane depolarization and the inhibition of DNA, RNA, and protein synthesis (Source: PMID: 24037461). Because the composition of bacterial membranes differs significantly from mammalian membranes—notably in the presence of negatively charged phospholipids and the absence of sterols—it serves as a viable target for selective toxicity. However, systemic use of such drugs is often limited by potential toxicity to host tissues, such as nephrotoxicity or myopathy. The formation of channels specifically bypasses traditional resistance mechanisms like efflux pumps, making it a potent strategy against multi-drug resistant organisms.

Other names

Bacterial inner membraneBacterial plasma membraneCytoplasmic membrane

Induction of transmembrane channel formation or pore creation leading to ion leakage, membrane depolarization, and loss of cellular homeostasis.