(A) Spot dilutions (diluted ten-fold) of the indicated strains plated on PYE ± cephalexin (6 μg/ml).
(B) Plates of the indicated strains grown in the presence of mecillinam minimum inhibitory concentration (MIC) test strips, with antibiotic concentration decreasing from top to bottom. The zone of clearance is highlighted in white (dashed line).
Strain key (Caulobacter): WT (EG865), ftsW**I*(EG1557), ftsW**I*ΔfzlA (EG2170). See also Figure S6.