D. discoideum producing the LCV/PtdIns(4)P probe P4C-mCherry was infected (MOI 5, 48 h) with L. pneumophila wild-type strains (JR32, Corby), or phospholipase triple mutants (∆plcABC, ∆plaACD) harboring the Ptac-mCerulean-PflaA-gfp reporter construct, and fixed and treated with an anti‐ubiquitin antibody, LCV escape and cytosolic localization of the bacteria was assessed by confocal microscopy through quantification of amoeba containing intact, P4C-mCherry-positive LCVs or ubiquitin-decorated, cytosolic bacteria. (A) Representative images of amoebae harboring L. pneumophila confined within LCVs or released from the LCV to the cytosol are shown (scale bars: 5 μm). 