(E) Epifluorescence microscopy analysis of the subcellular localization of UapA-GFP under conditions where sec13 transcription is ab initio derepressed (left panel) or repressed by thiamine (right panel). The inserts in the upper right corner in both panels reflect growth tests showing that Sec13 repression leads to arrest in growth and absence of colony formation. Scale bars: 5 μm. All images reflect practically identical results obtained in several experiments. Quantification: UapA-GFP PM/cytosolic intensity ratios are quantified when sec13 is derepressed (-thi) or repressed (+thi), with mean values being 0.54±0.02 and 0.31±0.02, respectively. There is a significant difference on UapA PM fluorescence intensity (****P<0.0001) in the absence of the COPII outer coat protein (statistical analysis as in B). Biological/technical replicates: 2/15 for each condition. 