Electron microscopy was performed as previously described (Noland et al., 2017) (
link). For time-lapse microscopy, WT CFT073, CFT073Dlgt and CFT073DlgtDlpp cells were grown overnight in LB medium containing 4% arabinose, back-diluted to a final OD600 of 0.1 and immediately placed between a cover slip and 1% agarose pad containing 0.2% glucose for imaging. Cells were maintained at 37 °C during imaging in a
stage top chamber (Okolab Inc.). Cells were imaged on a
Nikon Eclipse Ti inverted confocal microscope (Nikon Instruments Inc.) coupled with a
UltraVIEW VoX (PerkinElmer Inc.) and a 100× (NA 1.40) oil-immersion objective. Images were captured at various times using
ORCA-Flash 4.0 CMOS camera (Hamamatsu Photonics), collected using
Volocity software (Quorum Technologies) and processed using Fiji (Schindelin et al., 2012) (
link). For confocal microscopy, images were acquired on a Leica SP8 STED 3x platform using a 100× white light, NA:1.4 oil immersion objective. CFT073imp4213 cells were treated with Lgti, LspAi or LolCDEi at 1×MIC for 30 minutes, fixed with 4% paraformaldehyde and incubated with 1 µg/mL FM-64 dye and 1 µg/mL DAPI solution. Quantitation of bacterial cell area was performed using the ImageJ program by measuring at least ~100 bacterial cells from two independent experiments.
Diao J., Komura R., Sano T., Pantua H., Storek K.M., Inaba H., Ogawa H., Noland C.L., Peng Y., Gloor S.L., Yan D., Kang J., Katakam A.K., Nickerson N.N., Austin C.D., Murray J., Rutherford S.T., Reichelt M., Xu Y., Xu M., Yanagida H., Nishikawa J., Reid P., Cunningham C.N., & Kapadia S.B. (2020). Novel inhibitors ofE. colilipoprotein diacylglyceryl transferase are insensitive to resistance caused bylppdeletion.