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. 2014 May 9;9(5):e97148. doi: 10.1371/journal.pone.0097148

Figure 4. Polar colocalization of FAS-II proteins with Wag31.

Figure 4

(A) Enlarged images of wide-field microscopy experiments on GFP-fusion and mCherry-Wag31 fusion-expressing bacteria. GFP fluorescence images (GFP; leftmost column) together with mCherry fluorescence images (Che, middle column) of Msm::mCherry-wag31 expressing GFP fusions with MabA, InhA, KasA, KasB, or GFP alone (Ø) were acquired after 6 hours of induction. The merged images (right columns) allowed visualizing the polar colocalization of the fusions. Magnification and scale bars are identical to those indicated in Figure? 2A. (B) Bar graph representation of GFP polar indices of Msm::mCherry-wag31 strains expressing each GFP fusion after 6 hours of induction. Experimental values are represented as mean ± SD. Data were processes as described in Figure? 2B. Statistical t-tests were performed to determine the differences between the polar indices of GFP-InhA (dark grey bar) and GFP-KasA (light grey bar) and of GFP-KasA and GFP-KasB (white bar). The p values of indicated unpaired t-tests are symbolized by asterisks (*, p = 0.0271 for InhA-KasA), (*, p = 0.0186 for KasA-KasB). (C) Bar graph representation of GFP-mCherry colocalization indices of Msm::mCherry-wag31 strains expressing each GFP fusion after 6 hours of induction. Experimental values are represented as means ± SD. Data were processed as in panel B; no significant differences were found between colocalization indices. (D) Analysis of maximal mCherry-Wag31 (Che-Wag31, left column) and GFP-FAS-II fusion (GFP fusion, right column) fluorescence position within individual Msm::mCherry-wag31 bacteria expressing each GFP fusion after 6 hours of induction. Each type of bacterium was scanned on both channels. Each dot represents the position of maximum fluorescence of the scans expressed in % of the highest values. Each dot was plotted against its position in the bacterium with the length of bacteria reported to 1. The names of the FAS-II proteins fused with GFP are indicated. Ø refers to the Msm::mCherry-wag31 strain containing GFP alone.