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Mol. Cell. Biol., 11 1995, 5879-5887, Vol 15, No. 11
Copyright © 1995, American Society for Microbiology

Endocytosis and vacuolar degradation of the plasma membrane-localized Pdr5 ATP-binding cassette multidrug transporter in Saccharomyces cerevisiae

R Egner, Y Mahe, R Pandjaitan and K Kuchler
Department of Molecular Genetics, University and Biocenter of Vienna, Austria.

Multidrug resistance (MDR) to different cytotoxic compounds in the yeast Saccharomyces cerevisiae can arise from overexpression of the Pdr5 (Sts1, Ydr1, or Lem1) ATP-binding cassette (ABC) multidrug transporter. We have raised polyclonal antibodies recognizing the yeast Pdr5 ABC transporter to study its biogenesis and to analyze the molecular mechanisms underlying MDR development. Subcellular fractionation and indirect immunofluorescence experiments showed that Pdr5 is localized in the plasma membrane. In addition, pulse-chase radiolabeling of cells and immunoprecipitation indicated that Pdr5 is a short-lived membrane protein with a half-life of about 60 to 90 min. A dramatic metabolic stabilization of Pdr5 was observed in delta pep4 mutant cells defective in vacuolar proteinases, and indirect immunofluorescence showed that Pdr5 accumulates in vacuoles of stationary-phase delta pep4 mutant cells, demonstrating that Pdr5 turnover requires vacuolar proteolysis. However, Pdr5 turnover does not require a functional proteasome, since the half-life of Pdr5 was unaffected in either pre1-1 or pre1-1 pre2-1 mutants defective in the multicatalytic cytoplasmic proteasome that is essential for cytoplasmic protein degradation. Immunofluorescence analysis revealed that vacuolar delivery of Pdr5 is blocked in conditional end4 endocytosis mutants at the restrictive temperature, showing that endocytosis delivers Pdr5 from the plasma membrane to the vacuole.


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