Pdr12p-dependent and -independent fluorescein extrusion from baker's yeast cells

Fluorescein efflux from S. cerevisiae cells was measured to study the peculiarities of fluorescein transport system, which is important for yeast resistance to certain drugs and weak organic acid preservatives. Glucose-independent and glucose-stimulated fluorescein effluxes were characterized using...

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Veröffentlicht in:Acta biochimica polonica 2008-01, Vol.55 (3), p.595-601
Hauptverfasser: Lushchak, Volodymyr, Abrat, Oleksandra, Miedzobrodzki, Jacek, Semchyshyn, Halyna
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container_title Acta biochimica polonica
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creator Lushchak, Volodymyr
Abrat, Oleksandra
Miedzobrodzki, Jacek
Semchyshyn, Halyna
description Fluorescein efflux from S. cerevisiae cells was measured to study the peculiarities of fluorescein transport system, which is important for yeast resistance to certain drugs and weak organic acid preservatives. Glucose-independent and glucose-stimulated fluorescein effluxes were characterized using iodoacetate, cyanide and orthovanadate, inhibitors of glycolysis, electron transport chain, and ATPases, respectively. It is supposed that in glucose-free medium fluorescein extrusion is ATP-dependent and the energy for this efflux is mainly provided by respiration. In glucose-containing medium, glycolysis plays a critical role for extrusion of fluorescein. The results indicate that acetic acid inhibits the fluorescein efflux from yeast cells. The inhibition constant of glucose-stimulated fluorescein efflux is significantly lower in parental strain than in two mutants defective in PDR12 (ABC-transporter Pdr12p) or WAR1 (transcription factor of Pdr12p). It can be suggested that the membrane protein Pdr12 is involved in fluorescein extrusion from the yeast cells, but component(s) other than Pdr12p is (are) also important.
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Glucose-independent and glucose-stimulated fluorescein effluxes were characterized using iodoacetate, cyanide and orthovanadate, inhibitors of glycolysis, electron transport chain, and ATPases, respectively. It is supposed that in glucose-free medium fluorescein extrusion is ATP-dependent and the energy for this efflux is mainly provided by respiration. In glucose-containing medium, glycolysis plays a critical role for extrusion of fluorescein. The results indicate that acetic acid inhibits the fluorescein efflux from yeast cells. The inhibition constant of glucose-stimulated fluorescein efflux is significantly lower in parental strain than in two mutants defective in PDR12 (ABC-transporter Pdr12p) or WAR1 (transcription factor of Pdr12p). 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subjects Acetic Acid - pharmacology
ATP-Binding Cassette Transporters - genetics
ATP-Binding Cassette Transporters - metabolism
Biological Transport, Active - drug effects
Cyanides - pharmacology
Energy Metabolism
Fluorescein - pharmacokinetics
Fluorescent Dyes - pharmacokinetics
Genes, Fungal
Glucose - metabolism
Glucose - pharmacology
Iodoacetates - pharmacology
Mutation
Saccharomyces cerevisiae
Saccharomyces cerevisiae - drug effects
Saccharomyces cerevisiae - genetics
Saccharomyces cerevisiae - metabolism
Saccharomyces cerevisiae Proteins - genetics
Saccharomyces cerevisiae Proteins - metabolism
Stress, Physiological
Transcription Factors - genetics
Transcription Factors - metabolism
Vanadates - pharmacology
title Pdr12p-dependent and -independent fluorescein extrusion from baker's yeast cells
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