Fig 5.
Effects of ppGpp on DNA amounts of plasmids derived from Shiga toxin-converting bacteriophages. Relative levels of DNA of plasmids p933Wcmr (p993W), p22cmr (p22), p27cmr (p27), and p32cmr (p32) (derived from phages 933W, P22, P27, and P32, respectively) in an exponentially growing E. coli MG1655 host (WT) (open bars) and its relA spoT derivative (ppGpp0) (closed bars) were estimated. The DNA level of each plasmid determined in the wild-type host was considered to be 1, and other values reflect this value for each particular plasmid. The results are mean values from 3 experiments, with error bars representing SD.