title: The Saccharomyces cerevisiae MFS superfamily SGE1 gene confers resistance to cationic dyes.
abstract: A gene from Saccharomyces cerevisiae whose overexpression confers resistance to 10-N-nonyl acridine orange (NAO) has been isolated. This cationic dye binds acidic phospholipids and more specifically cardiolipin (Petit, J. M., Maftah, A., Ratinaud, M. H. and Julien, R. Eur. J. Biochem. 209, 267-273, 1992). The isolated gene was found to be identical to SGE1, a partial multicopy suppressor of the gal11 mutation (Amakasu, H., Suzuki, Y., Nishizawa, M. and Fukasawa, T. Genetics 134, 675-683, 1993), that also confers crystal violet resistance to a supersensitive strain (Ehrenhofer-Murray, A. E., Wurgler, F. E. and Sengstag, C. Mol. Gen. Genet. 244, 287-294, 1994). The data presented in this paper show that the SGE1 gene product, a member of the major facilitator superfamily, confers a pleiotropic drug-resistance phenotype when present in high copy number. The results also demonstrate that Sge1p acts as an extrusion permease whose specificity seems restricted to dye molecules possessing a large unsaturated domain that stabilizes a permanent positive charge such as NAO, crystal violet, ethidium bromide or malachite green.
authors.affiliation: Institut de Biotechnologie, Université de Limoges, France.
authors.forename: C
authors.initials: C
authors.lastname: Jacquot
authors.forename: R
authors.initials: R
authors.lastname: Julien
authors.forename: M
authors.initials: M
authors.lastname: Guilloton
mesh_terms: D000165:Acridine Orange / Q000494:pharmacology*; D003001:Cloning, Molecular; D004352:Drug Resistance, Microbial / Q000235:genetics*; D005656:Fungal Proteins / Q000235:genetics* / Q000502:physiology; D005800:Genes, Fungal; D026901:Membrane Transport Proteins; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors
chemical_list: D005656:Fungal Proteins; D026901:Membrane Transport Proteins; C082639:SGE1 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D000165:Acridine Orange