S. Previous control experiments showed that other proteins (e.g., BSA) do not elicit this effect under these conditions [24].Changes in gene expression in response to SBTX exposureA total of 39 genes were upregulated and 22 genes were downregulated in response to 16 h of SBTX treatment. After 18 h, 51 genes displayed altered expression; some of these genes overlapped with the genes that displayed altered expression after 16 h of SBTX treatment. Table 2 shows select genes that were upregulated in response to SBTX exposure for 16 h and 18 h. For quality control, MedChemExpress 50-14-6 qRT-PCR was conducted using four genes that were highly upregulated in the microarray analysis, namely RIM101, TUP1, AOX2 and HGT1. The upregulation of these genes was confirmed by qRT-PCR. The expression levels of theseSBTX Impairs Transport and Metabolism in FungiFigure 3. Growth curves of wild type and mutant C. albicans strains in the presence of SBTX. Wild type and mutant (tup1D/ tup1D and rim101D/rimD) C. albicans strains were grown for 40 h in the presence or absence of SBTX (200 mg?mL21). doi:10.1371/journal.pone.0070425.ggenes were found to be increased by 123.64-fold, 25.46-fold, 13.83-fold and 8.63-fold (absolute values), respectively, after 16 h. Among the 61 genes that were differentially expressed at 16 h, 26.2 (16 genes) were associated with the regulation of biological processes. Of particular interest were those GW-0742 site involved in transport (19.7 , 12 genes), organelle organisation (14.8 , 9 genes), filamentous growth (11.5 , 7 genes), response to stress (11.5 , 7 genes), response to drugs (9.8 , 6 genes) and carbohydrate metabolism (6.6 , 4 genes) (Figure 2A). Among the upregulated genes (Table 2), 9 were involved in small molecule (mainly hexose) import. Other metabolic processes affected were gluconeogenesis (PCK1) and galactose utilisation (GAL10). Moreover, the gene expression data showed that in the presence of SBTX, genes involved in stress responses and/or filamentation (e.g., PCL5, RIM101, CRZ1 and GAL10) were upregulated. Among the downregulated genes (Table 3) were those involved in the cell cycle and cell surface (e.g., PCL2, PES1), amino acid and RNA metabolic processes (e.g., NUP49), cellular respiration (e.g., TAR1) and filamentous growth (e.g., NOP15). Of the 51 genes differentially expressed after 18 h, 23.5 (12 genes) were involved in the regulation of physiological process, 23.5 (12 genes) were involved in transport, 17.6 (9 genes) were involved in stress responses and 13.7 (7 genes) were involved in filamentous growth (Figure 2B). In addition to the genes thatFigure 4. Light micrographs of wild type and mutant C. albicans strains in the presence of SBTX. Cells were incubated in the absence of SBTX (A, C, E) or in the presence of SBTX (B, D, F) (200 mg?mL21). C. albicans wild type strains (A, B), the C. albicans tup1D/tup1D mutant (C, D) and the C. albicans rim101D/rimD mutant (E, F) are shown. Bars (A-F): 10 mm. doi:10.1371/journal.pone.0070425.gSBTX Impairs Transport and Metabolism in Fungiindicative of the transition of the culture to stationary phase (e.g., PSF1, RIM1, HHT2, HHT21 and HHF1).Assessment of SBTX activity on 23977191 the growth of C. albicans gene deletion mutantsIt has been well documented that SBTX inhibits the growth of C. albicans wild type strains [5]. SBTX-induced growth inhibition was also observed in C. albicans tup1D/tup1D (Figure 3B) and rim101D/rim101D deletion strains (Figure 3C). No SBTX-induced morphological changes were obse.S. Previous control experiments showed that other proteins (e.g., BSA) do not elicit this effect under these conditions [24].Changes in gene expression in response to SBTX exposureA total of 39 genes were upregulated and 22 genes were downregulated in response to 16 h of SBTX treatment. After 18 h, 51 genes displayed altered expression; some of these genes overlapped with the genes that displayed altered expression after 16 h of SBTX treatment. Table 2 shows select genes that were upregulated in response to SBTX exposure for 16 h and 18 h. For quality control, qRT-PCR was conducted using four genes that were highly upregulated in the microarray analysis, namely RIM101, TUP1, AOX2 and HGT1. The upregulation of these genes was confirmed by qRT-PCR. The expression levels of theseSBTX Impairs Transport and Metabolism in FungiFigure 3. Growth curves of wild type and mutant C. albicans strains in the presence of SBTX. Wild type and mutant (tup1D/ tup1D and rim101D/rimD) C. albicans strains were grown for 40 h in the presence or absence of SBTX (200 mg?mL21). doi:10.1371/journal.pone.0070425.ggenes were found to be increased by 123.64-fold, 25.46-fold, 13.83-fold and 8.63-fold (absolute values), respectively, after 16 h. Among the 61 genes that were differentially expressed at 16 h, 26.2 (16 genes) were associated with the regulation of biological processes. Of particular interest were those involved in transport (19.7 , 12 genes), organelle organisation (14.8 , 9 genes), filamentous growth (11.5 , 7 genes), response to stress (11.5 , 7 genes), response to drugs (9.8 , 6 genes) and carbohydrate metabolism (6.6 , 4 genes) (Figure 2A). Among the upregulated genes (Table 2), 9 were involved in small molecule (mainly hexose) import. Other metabolic processes affected were gluconeogenesis (PCK1) and galactose utilisation (GAL10). Moreover, the gene expression data showed that in the presence of SBTX, genes involved in stress responses and/or filamentation (e.g., PCL5, RIM101, CRZ1 and GAL10) were upregulated. Among the downregulated genes (Table 3) were those involved in the cell cycle and cell surface (e.g., PCL2, PES1), amino acid and RNA metabolic processes (e.g., NUP49), cellular respiration (e.g., TAR1) and filamentous growth (e.g., NOP15). Of the 51 genes differentially expressed after 18 h, 23.5 (12 genes) were involved in the regulation of physiological process, 23.5 (12 genes) were involved in transport, 17.6 (9 genes) were involved in stress responses and 13.7 (7 genes) were involved in filamentous growth (Figure 2B). In addition to the genes thatFigure 4. Light micrographs of wild type and mutant C. albicans strains in the presence of SBTX. Cells were incubated in the absence of SBTX (A, C, E) or in the presence of SBTX (B, D, F) (200 mg?mL21). C. albicans wild type strains (A, B), the C. albicans tup1D/tup1D mutant (C, D) and the C. albicans rim101D/rimD mutant (E, F) are shown. Bars (A-F): 10 mm. doi:10.1371/journal.pone.0070425.gSBTX Impairs Transport and Metabolism in Fungiindicative of the transition of the culture to stationary phase (e.g., PSF1, RIM1, HHT2, HHT21 and HHF1).Assessment of SBTX activity on 23977191 the growth of C. albicans gene deletion mutantsIt has been well documented that SBTX inhibits the growth of C. albicans wild type strains [5]. SBTX-induced growth inhibition was also observed in C. albicans tup1D/tup1D (Figure 3B) and rim101D/rim101D deletion strains (Figure 3C). No SBTX-induced morphological changes were obse.
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