A simple procedure has been developed for isolating a microsomal fraction from Aspergillus fumigatus which contains cytochrome P-450. Maximum absorbance of the carbon monoxide/ferrous cytochrome P-450 difference spectrum was at a wavelength of 451 nm. The triazole antifungal agents, fluconazole and itraconazole, produced type II binding difference spectra with ferric cytochrome P-450 in A. fumigatus microsomes and an azole concentration of 0.5 microM was sufficient to saturate the spectroscopic response when the cytochrome P-450 concentration was 0.07 microM. This extremely high affinity binding precluded the determination of apparent dissociation constants for the cytochrome P-450-azole complexes. Itraconazole was found to have a marginally greater affinity for cytochrome P-450 than fluconazole, as determined from a comparison of their potential to reduce the rate of binding of carbon monoxide to the ferrous haemoprotein. The high affinity binding of both compounds to the cytochrome P-450 from A. fumigatus is consistent with their proposed antifungal mode of action through inhibition of the sterol 14 alpha-demethylase cytochrome P-450 required for ergosterol biosynthesis.
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