Ergosterol biosynthesis pathway enzymes

The ergosterol biosynthesis pathway is a complex metabolic route in fungi responsible for the production of ergosterol, the primary sterol component of fungal cell membranes. Ergosterol performs essential structural and functional roles similar to cholesterol in animal cells, including the regulation of membrane fluidity, permeability, and the activity of membrane-bound proteins. The pathway involves a series of enzymatic reactions, starting from acetyl-CoA and proceeding through intermediates such as squalene and lanosterol. Key enzymes in this pathway, such as squalene epoxidase (ERG1) and lanosterol 14-alpha-demethylase (ERG11), are critical for fungal viability and serve as the primary targets for several classes of antifungal drugs. Inhibition of these enzymes leads to the depletion of ergosterol and the accumulation of toxic sterol precursors, which disrupts the fungal cell membrane and ultimately results in cell death. This pathway is a cornerstone of antifungal therapy, used to treat a wide range of infections from superficial skin conditions to invasive systemic mycoses.

Other names

Ergosterol biosynthetic pathwayFungal sterol biosynthesis pathwayErgosterol synthesis pathwayERG pathway

Inhibition of specific enzymes within the ergosterol biosynthesis pathway (e.g., Lanosterol 14-alpha-demethylase by azoles, Squalene epoxidase by allylamines, and C-14 reductase/C-8 isomerase by morpholines), leading to ergosterol depletion and the accumulation of toxic sterol intermediates that disrupt membrane integrity and function.