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Robust, pleiotropic drug resistance 5 (Pdr5)-mediated multidrug resistance is vigorously maintained in Saccharomyces cerevisiae cells during glucose and nitrogen limitation.
FEMS Yeast Research 2018 June 2
Saccharomyces cerevisiae has sophisticated nutrient-sensing programs for responding to harsh environments containing limited nutrients. As a result, yeast cells can live in diverse environments, including animals, as a commensal or a pathogen. Because they live in mixed populations with other organisms that excrete toxic chemicals, it is of interest to know whether yeast cells maintain functional multidrug resistance mechanisms during nutrient stress. We measured the activity of Pdr5, the major Saccharomyces drug efflux pump under conditions of limiting nutrients. We demonstrate that the steady-state level of this transporter remains unchanged during growth in low concentrations of glucose and nitrogen even though two-dimensional gel electrophoresis revealed a decrease in the level of many proteins. We also evaluated rhodame 6G transport and resistance to three xenobiotic agents in rich (synthetic dextrose) and starvation medium. We demonstrate that Pdr5 function is vigorously maintained under both sets of conditions.
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