GRA15 enhanced susceptibility of type II strains to IFNγ-mediated killing in MEFs correlates with enhanced recruitment of IRGB6, GBPs, Ubiquitin, and LC3B.Figure 5MEFs were stimulated with IFNγ for 24 h (100 U/ml). IFNγ-stimulated MEFs were infected with Pru, PruΔgra15 or RH for 3 h and subsequently fixed, permeabilized and stained for (A) IRGB6 For analysis, at least 100 vacuoles were scored. All experiments were performed 3 times. On the right-hand side, a representative fluorescent image is shown for the Toxoplasma Pru strain, which expresses GFP. DNA was stained with Hoechst 33258. Scale bar is 10 µm. The yellow box inside each representative image is shown as an inset picture with magnification. All experiments were performed 3 independent times. MEFs were stimulated with IFNγ for 24 h (100 U/ml). IFNγ-stimulated MEFs were infected with Pru, PruΔgra15 or RH for 3 h and subsequently fixed, permeabilized and stained for (B) GBPs, For analysis, at least 100 vacuoles were scored. All experiments were performed 3 times. On the right-hand side, a representative fluorescent image is shown for the Toxoplasma Pru strain, which expresses GFP. DNA was stained with Hoechst 33258. Scale bar is 10 µm. The yellow box inside each representative image is shown as an inset picture with magnification. All experiments were performed 3 independent times. MEFs were stimulated with IFNγ for 24 h (100 U/ml). IFNγ-stimulated MEFs were infected with Pru, PruΔgra15 or RH for 3 h and subsequently fixed, permeabilized and stained for (C) total ubiquitin, For analysis, at least 100 vacuoles were scored. All experiments were performed 3 times. On the right-hand side, a representative fluorescent image is shown for the Toxoplasma Pru strain, which expresses GFP. DNA was stained with Hoechst 33258. Scale bar is 10 µm. The yellow box inside each representative image is shown as an inset picture with magnification. All experiments were performed 3 independent times. MEFs were stimulated with IFNγ for 24 h (100 U/ml). IFNγ-stimulated MEFs were infected with Pru, PruΔgra15 or RH for 3 h and subsequently fixed, permeabilized and stained for (D) K63-linked ubiquitin, For analysis, at least 100 vacuoles were scored. All experiments were performed 3 times. On the right-hand side, a representative fluorescent image is shown for the Toxoplasma Pru strain, which expresses GFP. DNA was stained with Hoechst 33258. Scale bar is 10 µm. The yellow box inside each representative image is shown as an inset picture with magnification. All experiments were performed 3 independent times. MEFs were stimulated with IFNγ for 24 h (100 U/ml). IFNγ-stimulated MEFs were infected with Pru, PruΔgra15 or RH for 3 h and subsequently fixed, permeabilized and stained for (E) K48-linked ubiquitin For analysis, at least 100 vacuoles were scored. All experiments were performed 3 times. On the right-hand side, a representative fluorescent image is shown for the Toxoplasma Pru strain, which expresses GFP. DNA was stained with Hoechst 33258. Scale bar is 10 µm. The yellow box inside each representative image is shown as an inset picture with magnification. All experiments were performed 3 independent times. MEFs were stimulated with IFNγ for 24 h (100 U/ml). IFNγ-stimulated MEFs were infected with Pru, PruΔgra15 or RH for 3 h and subsequently fixed, permeabilized and stained for (F) LC3B. For analysis, at least 100 vacuoles were scored. All experiments were performed 3 times. On the right-hand side, a representative fluorescent image is shown for the Toxoplasma Pru strain, which expresses GFP. DNA was stained with Hoechst 33258. Scale bar is 10 µm. The yellow box inside each representative image is shown as an inset picture with magnification. All experiments were performed 3 independent times. G) MEFs were stimulated with IFNγ for 24 h (100 U/ml) or left unstimulated and subsequently infected with Pru, PruΔgra15 and GRA15 complemented parasites for 24 h for measuring parasite growth by luciferase assay. All experiments were performed 3 independent times. H) Plaque numbers were measured for Pru (n=12), PruΔgra15 (n=12) and GRA15 complemented parasites (n=6). I-J) MEFs were stimulated with IFNγ for 24 h (100 U/ml) or left unstimulated and subsequently infected with RH or RH expressing type II GRA15. Plaque numbers were counted (n=3), and areas were measured 4 days p.i. (n=3).