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Autoactivated KlPDR1 gene in the control of multidrug resistance in Kluyveromyces lactis

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The KlPDR1 gene encodes a zinc finger transcription factor that has recently been shown to be involved in the control of multidrug resistance of Kluyveromyces lactis. In this work, we provide evidence that the K. lactis KlPDR1 gene is under positive autoregulation by KlPdr1p, which plays a role in the activation of the main multidrug resistance transporter gene KlPDR5. Electrophoretic mobility shift assays, as well as the use of gusA reporter constructs, enabled us to identify the 5′-tataTCCGGGTAactt-3′ sequence motif in the KlPDR1 promoter (in the position –326 to –319 bp) as the PDRE (pleiotropic drug responsive element) for the binding of KlPdr1p. The drug sensitivity of KlPDR1Δ mutant cells was complemented by introducing the plasmid-born KlPDR1 gene. The KlPdr1p activated the expression of the P KlPDR1 -gusA fusion gene, and the expression of the KlPDR1 gene was induced by fluconazole. The PDRE was also found in the promoter of KlPDR5, a gene encoding the ATP-dependent efflux pump responsible for the drug resistance phenomenon in K. lactis.

Keywords: KlPDR1; Kluyveromyces lactis; autoregulation; autorégulation; multidrug resistance; multirésistance aux médicaments

Document Type: Research Article


Publication date: October 27, 2011

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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