Journal
FEBS LETTERS
Volume 521, Issue 1-3, Pages 57-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0014-5793(02)02818-1
Keywords
drug resistance; ATP-binding cassette transporter; sterol; small lipophilic molecule transport; yeast
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Diagnosis and circumvention of multi-drug resistance requires an understanding of the underlying cellular mechanisms. In the model organism Saccharomyces cerevisiae, deletions of PDR5 or ERG6 increase sensitivity to many small lipophilic drugs. Pdr5p is a plasma membrane ATP-binding cassette transporter that actively exports drugs, thereby lowering their intracellular levels. The mechanism by which ERG6, an enzyme in sterol biosynthesis, affects drug accumulation is less clear. We show here that ERG6 limits the rate of passive drug diffusion across the membrane, without affecting Pdr5p-mediated drug export. Consistent with their action by distinct mechanisms, PDR5 and ERG6 effects on drug accumulation are additive. (C) 2002 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies.
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