Details of strains and primers used in this study are found in Tables 1 and 4. Analysis of growth and stress tolerance Growth was assessed in liquid media by measuring OD600 at fixed intervals in an automated Bioscreen C Analyzer (Thermo Labsystems) as described previously . Growth curves were generated
using Prism 5.0 (GW3965 GraphPad Software, Inc). Strains were analyzed in conditions of high osmolar stress (2.5 M glycerol or 1.0 M NaCl) and varying temperatures (30, 37, or 42°C). Strains grown in complete synthetic medium supplemented with uridine were also exposed to sub-inhibitory concentrations of caspofungin, amphotericin B, and 5-fluorocytosine. Pilot growth curves were first generated
to determine learn more the working concentration of each antifungal reagent to be used. The final concentrations of caspofungin, amphotericin B, and 5-fluorocytosine used for phenotypic analysis were 0.25, 0.5, and 10 μg ml-1, respectively. Cell wall integrity was tested on YPD agar medium containing Calcofluor White (20, 50, and 125 μg Ro 61-8048 manufacturer ml-1), caspofungin (0.1, 0.2, and 0.5 μg ml-1), Congo Red (50, 100, and 200 μg ml-1), or SDS (0.01%, 0.02%, and 0.05%). Endocytosis assay and visualization of vacuolar morphology The effect of the loss of function of SUR7 on endocytosis in both the yeast and filamentous forms was assessed by following the fate of the lypophilic dye Exoribonuclease FM4-64 . For dual staining with carboxy-DCFDA (CDCFDA; Invitrogen), cells
were first stained with FM4-64. Next, 1.0 × 106 cells ml-1 were resuspended in 50 mM sodium citrate buffer and CDCFDA was added according to the manufacturer’s instructions. Following a 15 minute incubation period at room temperature, microscopy then was performed on a Nikon Eclipse 80i fluorescent microscope (Nikon Instruments, Inc.). Images were acquired and color added using NIS-Elements Documentation software, version 2.34 (Nikon Instruments, Inc.). Enzyme assays Extracellular protease secretion was assayed on BSA plates . Lipase activity was visualized on egg-yolk agar plates and YNB agar containing 2.5% (v/v) Tween 80 . BSA degradation in liquid media was assessed by SDS-PAGE, followed by analysis of Sap2p secretion by Western blot analysis as described , except that the medium used was 1.18% Yeast Carbon Base (YCB, Difco™), 0.01% yeast extract, and 0.1% BSA. Equivolumes of culture supernatants were loaded from each strain, using the same concentration of cells for each strain. Saps 4-6p were induced by growing strains, at a starting concentration of 5 × 106 cells ml-1 in RPMI-1640, at 37°C for 24 h with shaking at 200 rpm. Saps 4-6p secreted into the media were analyzed by Western blot using anti-Sap5p polyclonal antibody (from M.