Fungal cell wall chitin and beta-glucan polymers (BDG/Chitin)

The fungal cell wall is a dynamic and essential structure that provides mechanical strength and protects the fungus from osmotic pressure. It is primarily composed of a cross-linked network of polysaccharides, most notably chitin and beta-glucans. Chitin is a polymer of N-acetylglucosamine that provides rigidity, while (1,3)-beta-D-glucan forms the main structural scaffold of the wall. These polymers are critical for fungal viability and are absent in human cells, making them highly specific targets for antifungal drug development (Source: NIH, PMC7150130). Echinocandins, such as caspofungin and micafungin, target the synthesis of beta-glucan by inhibiting the enzyme (1,3)-beta-D-glucan synthase, which leads to cell wall instability and lysis (Source: StatPearls, NBK532273). Chitin synthesis is targeted by compounds like Nikkomycin Z, which acts as a competitive inhibitor of chitin synthase (Source: PubMed, 16461019). Clinically, the presence of (1,3)-beta-D-glucan in the blood serves as a vital biomarker for the early detection of invasive fungal infections (Source: Journal of Clinical Microbiology, 43(9)). Resistance to these treatments often arises through mutations in the FKS genes, which encode the catalytic subunits of the glucan synthase enzyme.

Other names

(1,3)-beta-D-glucanChitinFungal cell wall polysaccharidesBeta-glucan1,3-beta-glucan

Inhibition of (1,3)-beta-D-glucan synthase and competitive inhibition of chitin synthase