Phenotypic characterization of low-Cu-responsive transcription factor Mac1 in A. nidulans. Phenotypic characterization of low-Cu-responsive transcription.

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Phenotypic characterization of low-Cu-responsive transcription factor Mac1 in A. nidulans. Phenotypic characterization of low-Cu-responsive transcription factor Mac1 in A. nidulans. (A) Equal numbers of conidia (2 × 104) from the parental wild-type (WT) strain, ΔAnmac1 mutant (ΔAnmac1) strain, and Anmac1-complemented (Anmac1c) strain were spot-inoculated onto MMPDR media supplemented with various concentrations of Cu, as indicated, and cultured at 37°C for 40 h for photography. (B) AnMac1 tagged with GFP (AnMac1-GFP) was ectopically expressed in the ΔAnMac1 mutant. DIC microscopy and DAPI staining were used to visualize the hyphal morphologies and the nuclei, respectively. AnMac1-GFP localized to the nuclear region in A. nidulans. Scale bar = 10 μm. (C) Colony morphologies of the A. nidulans mutant strains (panel 1) grown on MMPDR media (1 μM Cu) at 37°C for 48 h. Closeup views of the center (panel 2) and edge (panel 3) of individual colonies were taken with a stereo microscope (bars represent 100 μm and 20 μm, respectively). Analyses of the conidiophore morphologies of the relevant mutant strains (panel 4) grown on MMPDR media (1 μM Cu) at 37°C for 40 h were performed. Scale bar = 10 μm. Zhendong Cai et al. mSphere 2019; doi:10.1128/mSphere.00670-18