title: Novel target genes of the yeast regulator Pdr1p: a contribution of the TPO1 gene in resistance to quinidine and other drugs.
abstract: The yeast transcription factor Pdr1p regulates the expression of a number of genes, several of which encode ATP-driven transport proteins involved in multiple drug resistance. Among 20 genes containing binding consensus sequences for the transcription factor Pdr1p in their promoter, we studied more particularly the regulation and function of PDR16 (involved in phospholipid synthesis), TPO1 (involved in vacuolar transport of polyamines), YAL061W (homologous to polyol dehydrogenases) and YLR346C (unknown function). We found that the regulation of these four genes depends on Pdr1p, since promoter activities studied by lacZ fusion analysis and mRNA levels studied by Northern blotting analysis changed upon deletion or hyperactivation by the pdr1-3 mutant of this transcription factor. The drug sensitivity of the strains deleted for these genes revealed that TPO1, a gene previously found to be involved in spermidine resistance and vacuolar polyamine transport, is a determinant of multidrug transporter since it also mediates growth resistance to cycloheximide and quinidine. This resistance pattern overlapped with that of YOR273C, a homolog of TPO1. These two homologous transporters are thus bona fide members of the phylogenetic subfamily DHA1 (drug/proton antiport TC 2.A.1. 2) of the major facilitator superfamily. Both YOR273C and TPO1 as well as at least one other determinant involved in the yeast pleiotropic drug resistance network contribute to resistance to a quinoline-containing antimalarial drug.
authors.affiliation: Unité de Biochimie Physiologique, Université Catholique de Louvain, Place Croix du Sud 2/20, B-1348 Louvain-la-Neuve, Belgium.
authors.forename: M A
authors.initials: MA
authors.lastname: do Valle Matta
authors.forename: J L
authors.initials: JL
authors.lastname: Jonniaux
authors.forename: E
authors.initials: E
authors.lastname: Balzi
authors.forename: A
authors.initials: A
authors.lastname: Goffeau
authors.forename: B
authors.initials: B
authors.lastname: van den Hazel
mesh_terms: D015152:Blotting, Northern; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology; D002455:Cell Division / Q000187:drug effects / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology*; D004352:Drug Resistance, Microbial; D005656:Fungal Proteins / Q000235:genetics; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D007763:Lac Operon / Q000235:genetics; D009154:Mutation; D010641:Phenotype; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D011802:Quinidine / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics* / Q000254:growth & development; D029701:Saccharomyces cerevisiae Proteins; D013096:Spermine / Q000494:pharmacology; D015534:Trans-Activators / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors
chemical_list: D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C085480:PDR1 protein, S cerevisiae; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D013096:Spermine; D011802:Quinidine