As proteins, which are usually used as gel loading controls, are selleck inhibitor cytosolic selleck compound proteins and not present in the cell wall, we had added BSA to the extracted proteins to demonstrate that all lanes were
loaded with the same total amount of protein. Fortunately, all bands in the gels showed an additional C. albicans protein band at molecular weights below 37 kDa, which had the same intensity in all samples so that it could be used as indicator of the amount of extracted protein (see Additional files 2 and 3 and also Figure 3). In RPMI the intensity of this band usually was slightly lower than the intensity of the MCFO band (MCFO : control = 1,1). After a cultivation time of 5h in YPD the MCFO band had an intensity of approximately 50% of this control band (see Figure 3). Figure 4 Deletion of HOG1 led to de-repression of MCFOs and to increased ferric reductase activity. (A) SDS-PAGE analysis of MCFOs extracted from the WT (SC5314), the reference strain (DAY286), Δhog1 (JMR114) https://www.selleckchem.com/products/s63845.html and Δpbs2 (JJH31) mutants
grown in YPD at 30°C for 16 h. For the whole gel see Additional file 2. (B) Cell surface ferric reductase activity of SC5314 (WT), DAY286 (reference strain) and Δhog1 (JMR114) under both restricted iron (RIM) and sufficient iron (YPD) conditions. Mean values and standard deviations of three independent experiments (n = 3) are shown. *** denotes P < 0.001 (student’s t-test). The ferric reductase of activity of the WT strain (SC5314) grown in YPD was set as 100%. (C) SDS-PAGE analysis of MCFOs extracted from Δhog1 (JMR114) grown in sufficient iron (YPD) or restricted iron (RIM) medium at 30°C for 3 h. Identity of the MCFOs was confirmed by mass spectrometry. For the whole gel see Additional file 3. Table 2 C.
albicans strains used in this work Strain Genotype Reference SC5314 (MYA-2876) Wild type (WT)  DAY286 ura3∆ ::λimm434/ura3∆ ::λimm434, iro1/iro1, ARG4::URA3::arg4::hisG/arg4::hisG, his1::hisG/his1::hisG  JMR114 (Δhog1) ura3∆ ::imm434/ura3∆ ::imm434, iro1/iro1, arg4::hisG/arg4::hisG,his1::hisG/his1::hisG, hog1::ARG4/hog1::URA3 Meloxicam  CNC13 (Δhog1) ura3∆ ::imm434/ura3∆ ::imm434, iro1/iro1, his1∆ ::hisG/his1∆ ::hisG hog1::hisGURA3- hisG/hog1::hisG  JJH31 (Δpbs2) ura3∆ ::λimm434/ura3∆ ::λimm434, iro1/iro1, arg4::hisG/arg4::hisG,his1::hisG/his1::hisG, pbs2::ARG4/pbs2::URA3  BRD3 (Δpbs2) ura3∆ ::imm434/ura3∆ ::imm434, iro1/iro1, his1∆ ::hisG/his1∆ ::hisG pbs2∆ : : cat/pbs2∆ :: cat-URA3-cat  hAHGI (Δhog1 + HOG1) CNC13, ACT1p-HOG1-GFP : : leu2/LEU2  As FRE10, the major ferric reductase of C. albicans, was also reported to be de-repressed in the Δhog1 mutant (see above) , we determined cell surface ferric reductase activity of whole yeast cells using a previously published protocol .