Figure 3From: Effects of disruption of heat shock genes on susceptibility of Escherichia coli to fluoroquinolonesFractionation of proteins synthesized in E. coli exposed to LVFX. Proteins from cultures labeled in the presence of 10 μg/ml LVFX were fractionated as described in Methods and separated by SDS-PAGE (A). The protein samples from untreated cells were run in lanes 1, 3, 5, 7 and 9. The samples from LVFX-treated cells were in lanes 2, 4, 6, 8 and 10. Lanes contain protein fractions as follows: lanes 1 and 2, whole cell lysates; lanes 3 and 4, cytoplasmic and periplasmic protein fractions; lanes 5 and 6, membrane-associated protein fractions. The membrane-associated proteins were solubilized in 1 M NaCl and then dialyzed described in Methods. After centrifugation, the pellets were solubilized in lysis buffer and applied in lanes 7 and 8. The supernatants were applied in lanes 9 and 10. Portions of the protein samples applied in lanes 7 and 8 were also subjected to two-dimensional gel electrophoresis and the results are shown in (B) and (C), respectively.Back to article page