Bacterial cell wall and membrane; Fungal cell wall and membrane

The bacterial and fungal cell wall and membrane are essential structural barriers that encase the cytoplasm, providing rigidity, protection against osmotic stress, and a primary interface for nutrient exchange and immune recognition. These structures are compositionally distinct—fungal cell walls are built mainly of chitin, β-glucans, and mannoproteins, while bacterial cell walls typically contain peptidoglycan. Both structures are absent or fundamentally different in humans, making them excellent therapeutic targets for antimicrobials. Many antibiotics and antifungals—including echinocandins, polyenes, β-lactams, and others—act by inhibiting cell wall biosynthetic enzymes or disrupting membrane integrity. Drug resistance and potential toxicity pose challenges, especially as fungi and bacteria may alter wall/membrane composition to evade therapy[1][2][3][4][5][6][8]. Note: This is not a single molecular target but an umbrella term for several related structures and processes. For maximal precision in drug discovery or biomedical informatics, targets should be specified as individual enzymes (e.g., "β-D-glucan synthase", "chitin synthase", "peptidoglycan synthase") or unique membrane components (e.g., "ergosterol", "lipid A").

Other names

Cell envelope (bacteria)Fungal cell envelopeBacterial cell membraneFungal plasma membrane

Inhibition of cell wall biosynthesis (e.g., targeting glucan synthase, chitin synthase, peptidoglycan synthesis in bacteria) Disruption of membrane integrity and permeability (e.g., polyenes binding to ergosterol, polymyxins disrupting Gram-negative membranes) Interference with membrane-associated proteins and enzyme function