Journal: Microbiology Spectrum
Article Title: Antigen 43 associated with Escherichia coli membrane vesicles contributes to bacterial cell association and biofilm formation
doi: 10.1128/spectrum.01890-24
Figure Lengend Snippet: Characterization of E. coli Ag43 −ve and Ag43 +ve MVs. MVs isolated from ( A ) E. coli HEHA16 pBAD/MycHisA (Ag43 −ve ) and ( B ) E. coli HEHA16 pBAD/MycHisA:: agn43 (Ag43 +ve ) were visualized by transmission electron microscopy. Scale bar = 100 nm. Images are representative of three biological replicates. ( C ) The number of Ag43 −ve and Ag43 +ve MVs produced per 10 10 bacterial cells was determined by ZetaView Nanoparticle Tracking Analysis (NTA). Data are represented as the mean ± SEM of three biological replicates. * P < 0.05, unpaired t -test. ( D ) The number of viable Ag43 −ve and Ag43 +ve E. coli HEHA16 bacteria present in individual cultures from which MVs were isolated was determined by viable counts. Data show CFU/mL of individual cultures, and the mean ± SEM of three biological replicates. ns, not significant. ( E ) The size distribution of Ag43 −ve MVs and Ag43 +ve MVs was determined using ZetaView NTA. Data represent the mean of three biological replicates. ( F ) Quantification of the size distribution of Ag43 −ve MVs (squares; open bars) or Ag43 +ve MVs (circles; grey bars) by ZetaView NTA. Data are represented as the mean ± SEM of three biological replicates. * P < 0.05, unpaired t -test within each size range.
Article Snippet: MV size and concentration were determined using the nanoparticle tracking analyzer ZetaView basic PMX-120 NTA (Particle Metrix, Germany), as previously ( ).
Techniques: Isolation, Transmission Assay, Electron Microscopy, Produced, Bacteria