Bacterial and fungal cell membranes and cell walls

The bacterial and fungal cell membranes and cell walls are essential structural components that provide mechanical strength, maintain osmotic pressure, and regulate the transport of molecules (StatPearls, 2023). In bacteria, the cell wall is primarily composed of peptidoglycan, which is targeted by beta-lactam antibiotics to induce cell lysis, while the cell membrane is targeted by lipopeptides like daptomycin (NIH, 2022). Fungal cells possess a unique cell wall containing chitin and beta-glucans, and a cell membrane characterized by the presence of ergosterol instead of cholesterol (NCBI, 2021). These structures are critical for microbial survival and are absent in human cells, making them ideal targets for selective toxicity in treating infectious diseases (PubMed, 2023). Drugs targeting these barriers either inhibit the enzymatic synthesis of structural polymers or directly disrupt the physical integrity of the lipid bilayer (Merck Manual, 2023). However, the clinical utility of these targets is frequently challenged by the emergence of multi-drug resistant organisms and potential host toxicities associated with certain membrane-disrupting agents.

Other names

Microbial cell envelopeBacterial cell wallFungal cell wallCytoplasmic membranePeptidoglycan layerErgosterol-containing membrane

Inhibition of peptidoglycan synthesis and cross-linking, inhibition of 1,3-beta-D-glucan synthesis, disruption of membrane integrity through pore formation or depolarization, and inhibition of ergosterol biosynthesis.