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• W2109016317 startingPage "3154" @default.
• W2109016317 abstract "During applications of 5-fluorocytosine (5FC) and fluconazole (FLC), additive or synergistic action may even occur when primary resistance to 5FC is established. Here, we analysed conjoint drug action in Saccharomyces cerevisiae strains deficient in genes known to be essential for 5FC or FLC function. Despite clear primary resistance, residual 5FC activity and additive 5FC+FLC action in cells lacking cytosine permease (Fcy2p) or uracil phosphoribosyl transferase (Fur1p) were detected. In contrast, Δfcy1 mutants, lacking cytosine deaminase, became entirely resistant to 5FC, concomitantly losing 5FC+FLC additivity. Disruption of the orotate phosphoribosyltransferase gene (URA5) in the wild-type led to low-level 5FC tolerance, while an alternative orotate phosphoribosyltransferase, encoded by URA10, contributed to 5FC toxicity only in the Δura5 background. Remarkably, combination of Δura5 and Δfur1 resulted in complete 5FC resistance. Thus, yeast orotate phosphoribosyltransferases are involved in 5FC metabolism. Similarly, disruption of the ergosterol Δ5,6-desaturase-encoding gene ERG3 resulted only in partial resistance to FLC, and concomitantly a synergistic effect with 5FC became evident. Full resistance to FLC occurred in Δerg3 Δerg11 double mutants and, simultaneously, synergism or even an additive effect with FLC and 5FC was no longer discernible. Since the majority of spontaneously occurring resistant yeast clones displayed residual sensitivity to either 5FC or FLC and those strains responded to combined drug treatment in a predictable manner, careful resistance profiling based on the findings reported here may help to address yeast infections by combined application of antimycotic compounds." @default.
• W2109016317 created "2016-06-24" @default.
• W2109016317 creator A5017492556 @default.
• W2109016317 creator A5038001866 @default.
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• W2109016317 date "2008-10-01" @default.
• W2109016317 modified "2023-10-16" @default.
• W2109016317 title "Genetic prerequisites for additive or synergistic actions of 5-fluorocytosine and fluconazole in baker's yeast" @default.
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• W2109016317 doi "https://doi.org/10.1099/mic.0.2008/020107-0" @default.
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• W2109016317 hasPublicationYear "2008" @default.
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