Fungal cell wall and cell membrane

The fungal cell wall and cell membrane are essential protective structures that maintain the viability and shape of fungal cells. The cell wall is a rigid outer layer composed of chitin, beta-glucans, and mannoproteins, providing osmotic stability and protection against environmental stress (StatPearls: Antifungal Medications; NCBI: Fungal Cell Wall). Beneath the wall lies the cell membrane, a lipid bilayer where ergosterol serves as the primary sterol, regulating fluidity and the function of membrane-bound proteins (NIH: Ergosterol as an Antifungal Target). Because these structures contain components absent in human cells, such as beta-glucans and ergosterol, they are primary targets for antifungal therapy (PubChem: Fluconazole Mechanism). Echinocandins disrupt the cell wall by inhibiting 1,3-beta-glucan synthase, while polyenes like amphotericin B bind to ergosterol to create lethal pores in the membrane (StatPearls: Antifungal Medications; Wikipedia: Antifungal). Azoles and allylamines further target the membrane by inhibiting enzymes in the ergosterol biosynthetic pathway, such as lanosterol 14-alpha-demethylase and squalene epoxidase (PubChem: Fluconazole Mechanism; UniProt: Lanosterol 14-alpha-demethylase). These targets are vital for managing systemic and superficial fungal infections, though challenges like drug resistance and host toxicity remain significant (NCBI: Fungal Cell Wall; Wikipedia: Antifungal).

Other names

Fungal cell envelopeMycological cell wall and plasma membrane

Inhibition of 1,3-beta-D-glucan synthase (echinocandins), direct binding to ergosterol to create trans-membrane pores (polyenes), and inhibition of ergosterol biosynthesis via lanosterol 14-alpha-demethylase (azoles) or squalene epoxidase (allylamines).