Microbial cell membrane and associated biomolecules

The microbial cell membrane and its associated biomolecules constitute a vital structural and functional barrier that separates the internal environment of bacteria and fungi from their surroundings (Wikipedia, 2024). In bacteria, the cytoplasmic membrane is responsible for essential processes such as ATP synthesis via the electron transport chain, nutrient transport, and the synthesis of cell wall components like peptidoglycan (PMID: 27337121). In fungi, the membrane is characterized by the presence of ergosterol, which maintains membrane fluidity and integrity (PMID: 28103512). Because these membranes differ significantly in composition from mammalian cell membranes—such as the presence of lipopolysaccharides in Gram-negative bacteria or ergosterol in fungi—they serve as critical targets for antimicrobial therapy (StatPearls, NBK534110). Drugs like polymyxins and polyenes exploit these differences to selectively disrupt microbial membranes, leading to the leakage of essential ions and metabolites, loss of membrane potential, and ultimately, rapid cell death (PMID: 30244113). However, the relative lack of specificity compared to protein-specific inhibitors often results in significant clinical toxicities, such as nephrotoxicity (PMID: 24688002).

Other names

Bacterial cell membraneFungal cell membraneCytoplasmic membranePlasma membraneCell envelope

Drugs targeting the microbial cell membrane typically act through physical disruption of the lipid bilayer, formation of transmembrane pores, or binding to specific membrane-associated precursors (like Lipid II or ergosterol) to cause depolarization, leakage of intracellular contents, and rapid cell death (PMID: 27337121; PMID: 28103512).