Cell wall and membrane components of Candida species

The cell wall and membrane of Candida species are complex, multi-layered structures essential for fungal viability, morphogenesis, and pathogenesis. The cell wall is primarily composed of an inner skeleton of chitin and beta-glucans (specifically beta-1,3-glucan and beta-1,6-glucan) and an outer layer of highly glycosylated mannoproteins (Gow et al., 2017, Nature Reviews Microbiology). The cell membrane is characterized by the presence of ergosterol, a sterol unique to fungi that maintains membrane fluidity and integrity. These components serve as the primary targets for the three major classes of antifungal drugs: echinocandins, polyenes, and azoles (Odds et al., 2003, Journal of Antimicrobial Chemotherapy). Echinocandins inhibit the synthesis of beta-1,3-glucan, while polyenes physically disrupt the membrane by binding ergosterol, and azoles inhibit the enzymatic pathway of ergosterol biosynthesis. Because these structures are either absent or significantly different in human cells, they provide a high degree of selective toxicity for treating various forms of candidiasis (Nett & Andes, 2016, Infectious Disease Clinics of North America). These infections range from superficial mucosal conditions like oral thrush to life-threatening systemic candidemia in immunocompromised patients. Additionally, the cell wall components act as pathogen-associated molecular patterns (PAMPs) that are recognized by the host immune system to trigger an immune response.

Other names

Fungal cell wallFungal cell membraneCandida cell envelopeCandida cell wall

Inhibition of (1,3)-beta-D-glucan synthase; binding to ergosterol to form trans-membrane pores; inhibition of lanosterol 14-alpha-demethylase (ERG11) to deplete ergosterol.