Bacterial and fungal cell wall and membrane

The bacterial and fungal cell walls and membranes are complex structural ensembles that are crucial for microbial survival and pathogenesis. The bacterial cell wall consists primarily of peptidoglycan, which provides mechanical strength, osmotic protection, and shape, with additional components such as teichoic acids in Gram-positive bacteria that can influence immune recognition and antibiotic resistance. The bacterial cell membrane (cytoplasmic membrane) acts as a selective barrier and site for various metabolic activities. The fungal cell wall is mainly composed of polysaccharides—chiefly chitin and glucans—along with associated glycoproteins, which together provide rigidity, flexibility, and protection against environmental and host-derived stresses. The fungal cell membrane contains ergosterol, distinguishing it from the cholesterol-rich membranes of mammalian cells. Both bacterial peptidoglycan and fungal glucan/chitin biosynthetic pathways are absent in humans, making them prime targets for antimicrobial drugs such as beta-lactams (bacteria) and echinocandins (fungi)[1][2][4][5][6]. Cell wall and membrane components can act as pathogen-associated molecular patterns (PAMPs), eliciting host immune responses and serving as biomarkers for infection. Note: - "Bacterial and fungal cell walls and membranes" as formulated is *not* a specific molecular target, but rather refers to broad structural features common to many pathogenic microbes. Effective drugs often target more precisely defined molecules within these structures (e.g., "β-1,3-glucan synthase" or "peptidoglycan synthase"), not the entire wall or membrane. Therefore, this entry is marked as **incorrect** as a canonical therapeutic target, and it is recommended to use more specific names (e.g., "β-1,3-glucan synthase" for fungi, "penicillin-binding protein" for bacteria) for structured data purposes.

Other names

Bacterial cell wallFungal cell wallBacterial cell membraneFungal cell membrane

Inhibition of cell wall biosynthesis (e.g., by beta-lactams inhibiting peptidoglycan synthesis in bacteria, echinocandins inhibiting β-1,3-glucan synthesis in fungi); Disruption of membrane integrity (e.g., polyenes binding to ergosterol in fungal membranes); Inhibition of ergosterol biosynthesis (by azoles in fungi)