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• W2107266240 abstract "ABSTRACT The cytochrome P450 sterol 14α-demethylase (CYP51) of Candida albicans is involved in an essential step of ergosterol biosynthesis and is the target for azole antifungal compounds. We have undertaken site-directed mutation of C. albicans CYP51 to produce a recombinant mutant protein with the amino acid substitution R467K corresponding to a mutation observed clinically. This alteration perturbed the heme environment causing an altered reduced-carbon monoxide difference spectrum with a maximum at 452 nm and reduced the affinity of the enzyme for fluconazole, as shown by ligand binding studies. The specific activity of CYP51(R467K) for the release of formic acid from 3β-[32- 3 H]hydroxylanost-7-en-32-ol was 70 pmol/nmol of P450/min for microsomal protein compared to 240 pmol/nmol of P450/min for microsomal fractions expressing wild-type CYP51. Furthermore, inhibition of activity by fluconazole revealed a 7.5-fold-greater azole resistance of the recombinant protein than that of the wild type. This study demonstrates that resistance observed clinically can result from the altered azole affinity of the fungal CYP51 enzyme." @default.
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• W2107266240 date "2000-01-01" @default.
• W2107266240 modified "2023-10-15" @default.
• W2107266240 title "The R467K Amino Acid Substitution in <i>Candida albicans</i> Sterol 14α-Demethylase Causes Drug Resistance through Reduced Affinity" @default.
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• W2107266240 doi "https://doi.org/10.1128/aac.44.1.63-67.2000" @default.
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