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• W1992667030 abstract "The PDR1 and PDR3 genes encode the main transcription activators involved in the control of multidrug resistance in Saccharomyces cerevisiae. To identify the amino acids essential for Pdr3p function, the loss-of-function pdr3 mutants were isolated and characterized. Two plasmid-borne pdr3 alleles, pdr3-E902Ter and pdr3-D853Y, which failed to complement drug hypersensitivity in the Deltapdr1Deltapdr3 mutant strain, were isolated. The E902Ter mutation resulted in a truncated protein lacking the C-terminal activation domain. The D853Y mutation allowed the expression of entire Pdr3p, but its transactivation function was lost. When overexpressed from the P(GAL1) promoter, the two mutant alleles increased the sensitivity of wild-type cells to cycloheximide and fluconazole and suppressed drug resistance in gain-of-function pdr1 and pdr3 mutant strains. The drug-sensitizing effect of overexpressed loss-of-function pdr3 mutant alleles correlated with their ability to suppress PDR5 transcription and rhodamine 6G accumulation in transformants of the wild-type and Deltapdr1 mutant strains. These results demonstrate that amino acid residue Asp853 is essential for Pdr3p function, and indicate that specific loss-of-function pdr3 mutations can convert the Pdr3p transcription activator to a multicopy suppressor of multidrug resistance." @default.
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• W1992667030 date "2007-03-01" @default.
• W1992667030 modified "2023-10-16" @default.
• W1992667030 title "Loss-of-functionpdr3mutations convert the Pdr3p transcription activator to a protein suppressing multidrug resistance inSaccharomyces cerevisiae" @default.
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• W1992667030 doi "https://doi.org/10.1111/j.1567-1364.2006.00174.x" @default.
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