1 plasmid containing hygromycin resistance gene was used as the second plasmid in co-transformation reaction. A positive transformant was selected and tested on minimal medium. The expression of AfuNce102 driven by its own promoter resulted in normal sporulation and growth phenotype (data not shown). To investigate the intracellular localization of AfuNce102,

a C-terminal fusion construct, driven by the glaA inducible promoter, was prepared and transformed into the A. fumigatus AF293 parent strain. A positive transformant was isolated and grown in inducing medium containing maltodextrin 1% as the sole carbon source. This transformant was directly analyzed by fluorescent microscopy. In young mycelia, Nce102 tagged with EGFP was primarily detected in ER with a tip-high gradient (Fig. 3d). The fluorescence was also detectable at selleck compound the Akt inhibitor septum (Fig. 3a and e). In old hyphae, the ER localization of EGFP-tagged protein was more clear, and the EGFP fluorescence was frequently observed in ring-like structures (Figs 3e and 4b). DAPI staining of mycelia demonstrated that these ring structures are nuclei (Fig. 4b and c). During the conidiophore formation,

a faint and diffused fluorescence was detected in the vesicle, and later, a strong signal was observed in phialides and mature conidia (Fig. 5). A variable intensity of EGFP fluorescence was observed among phialides. As the expression of AfuNce102 under the control of glaA promoter may result in a nonphysiological level of the tagged protein, we tested the growth phenotype of AfuNce102-GFP transformant in the inducing medium. The results showed that overexpression of AfuNce102-GFP did not affect the growth phenotype of the A. fumigatus, including the radial growth rate or sporulation (data not shown). To test whether the deletion of AfuNce102 can affect the virulence of A. fumigatus in an animal model, the survival of infected, temporarily immunocompromised mice was monitored for 4 weeks. Figure 6

illustrates the survival curves during the experiment. In statistical analysis of survival percentages using Mann–Whitney ADP ribosylation factor test, a significant survival difference was observed between the group infected with wild type spores and the control group, which only received cyclophosphamide (P = 0.029). The difference of survival between the group infected by AfuNce102 deletant spores and the control group was also significant (P = 0.04). However, the difference of survival between two infected groups was not statistically significant (P = 0.34). These comparisons support the conclusion that the virulence of fungus has not been affected by AfuNce102 gene deletion. So far, several studies have documented the role of Nce102 in membrane organization, eisosome assembly, and endocytosis in yeast (Grossmann et al., 2008; Frohlich et al., 2009).