Figure 4.
Compartments preloaded with a fluid-phase marker do not fuse with macropinosomes harboring L. pneumophila with intact Dot/Icm system. Bone marrow–derived macrophages were incubated at an MOI = 10 along with 1 mg/ml Rh-Dx155 for 30 min at 37°C and then incubated with bacteria either in the continued presence (A) or absence (B) of the fluid-phase marker (Materials and Methods). Number of bacteria in compartments staining with TRITC was determined as described in Material and Methods. Gray bar, LP02-GFP (intact Icm/Dot system); black bar, Lp03-GFP (dotA−).
