Which drug specifically inhibits squalene epoxidase in fungi?

Which drug specifically inhibits squalene epoxidase in fungi?

• A. Fluconazole
• B. Griseofulvin
• C. Terbinafine
• D. Clotrimazole

Answer: (C)

The correct answer is the drug that specifically inhibits squalene epoxidase, an enzyme crucial in the biosynthetic pathway of ergosterol, which is an essential component of fungal cell membranes. Terbinafine, the drug in question, effectively blocks this enzyme, leading to the accumulation of squalene and a reduction in ergosterol synthesis. This mechanism is particularly important in treating various fungal infections, as it disrupts the integrity of the fungal cell membrane, ultimately leading to cell death. In contrast, the other options operate through different mechanisms. Fluconazole, for instance, inhibits lanosterol demethylase, another step in ergosterol biosynthesis, but it does not target squalene epoxidase directly. Griseofulvin works by binding to tubulin, inhibiting mitotic spindle formation, while Clotrimazole affects the same enzymatic pathway as fluconazole but also has a broader target profile. Therefore, Terbinafine's specific action on squalene epoxidase sets it apart as the correct choice for this question.

The correct answer is the drug that specifically inhibits squalene epoxidase, an enzyme crucial in the biosynthetic pathway of ergosterol, which is an essential component of fungal cell membranes. Terbinafine, the drug in question, effectively blocks this enzyme, leading to the accumulation of squalene and a reduction in ergosterol synthesis. This mechanism is particularly important in treating various fungal infections, as it disrupts the integrity of the fungal cell membrane, ultimately leading to cell death.

In contrast, the other options operate through different mechanisms. Fluconazole, for instance, inhibits lanosterol demethylase, another step in ergosterol biosynthesis, but it does not target squalene epoxidase directly. Griseofulvin works by binding to tubulin, inhibiting mitotic spindle formation, while Clotrimazole affects the same enzymatic pathway as fluconazole but also has a broader target profile. Therefore, Terbinafine's specific action on squalene epoxidase sets it apart as the correct choice for this question.