Figure 7. ShyA overexpression rescues morphological defects associated with carboxypeptidase insufficiency in E. coli.

(A) E. coli strains CS109 and Δ4 (CS109 ΔdacA ΔdacB ΔdacC ΔpbpG) containing either an empty vector (pHL100) or a vector containing an IPTG-inducible copy or ShyA (pHL100-ShyA) were incubated overnight at 37°C in LB medium with 0.2% glucose, sub-cultured 1:100 in LB and incubated for 2 hours, then back-diluted 1:100 in LB and grown for an additional 2 hours. 1 mM or 0.2% glucose was added to the cultures, phase contrast images were taken 3 hours after induction. (B) Microscopy images were segmented with Omnipose and analyzed for area, length, and width with MicrobeJ. Statistical significance was assessed via Welch’s t-test. ****, P < 0.0001.