EMBO/SourceData huggingface dataset:
Figure 5(C) Comparison of NTA yield of retrieved N-termini of proteins starting at position 1 or 2. The majority of these proteins, corresponding mostly to cytosolic components, undergoing or not to N-terminal methionine excision, were not affected by inactivation of GNAT2. For statistical analyses nsi-1 and nsi-2 were pooled and compared to the wild type. Two independent technical replicates of four biological replicates for each of the WT, nsi-1 and nsi-2 samples were analysed. Error bars are ± SD. (D) Comparison of NTA yield of retrieved N-termini of proteins starting at positions > 2. Clear alteration of NTA yield was observed in nsi mutant lines in the pool of nuclear-encoded plastid proteins. nsi-1 and nsi-2 samples were treated as in D. Error bars are ± SD (E) Comparison of NTA yields of retrieved N-termini in plastid proteins. Similar variation as in panel D was observed when NTA of only plastid proteins was analyzed.(F) Volcano plot representing NTA analyses of nsi knockout lines (treated together) and wild type. For this analysis, the p-value was calculated using Excel's two-tailed t-test function, for two-sample with equal variance. The most impacted proteins are shown in green. N is related to the number of quantified N-termini.
Figure 2B, Both PTPN3 and PTPN3 (L232R), but not the phosphatase-dead mutants PTPN3 (D811A) and PTPN3 (C842S), dephosphorylate P-EGFR (Y1173). Wildtype PTPN3 or its mutants were co-transfected with EGFR into HEK293T cells as indicated. 24 h later, cells were harvested for Western blotting. Levels of P-EGFR (Y1173), EGFR, PTPN3 and its mutants were examined by appropriate antibodies.C, PTPN3 and PTPN3 (D811A) enhance TGF-β-induced target protein expression. HaCaT cells stably expressing HA-PTPN3 or HA-PTPN3 (D811A) were stimulated with 2 ng/mL of TGF-β for 6 h and then harvested for cell lysates. Protein levels were examined by Western blotting with appropriate antibodies as indicated.D, PTPN3 and its catalytically inactive mutants PTPN3 (D811A) and PTPN3 (C842S) equally enhance TGF-β-induced reporter gene activity. HaCaT cells were transfected with expression plasmids for each PTPN3 variant and CAGA-luc reporter and Renilla-luc reporter. Cells were harvested for relative luciferase assay after TGF-β (2 ng/mL, 8 h) treatment. Data are shown as mean ± SEM; n = 3. Statistical analysis was performed using two-tailed Student's t-test. ***P < 0.001.E, PTPN3 FERM domain enhances TGF-β-induced reporter gene activity as potently as wildtype PTPN3. HaCaT cells were transfected with expression plasmids for PTPN3 truncations and CAGA-luc reporter, and internal control Renilla-luc reporter. Cells were harvested for relative luciferase assay with TGF-β treatment (2 ng/mL, 8 h). Data are shown as mean ± SEM; n = 3. Statistical analysis was performed using two-tailed Student's t-test. **P<0.01, ***P<0.001. NS, non-significant.
Figure 3A, PTPN3 and PTPN3 (D811A) stabilize TβRI. TβRI and PTPN3 were detected by Western blotting with appropriate antibodies as indicated in HaCaT cells stably expressing PTPN3 or PTPN3 (D811A).B, shRNA PTPN3-mediated reduction of endogenous TβRI level is restored by MG132. HaCaT cells expressing shRNA PTPN3-1, shRNA PTPN3-2 or control shRNA were treated with MG132 (20 μM) for 4 h. Cell lysates were analyzed by Western blotting with anti-TβRI, anti-PTPN3 and anti-GAPDH antibodies.C, PTPN3 rescues the degradation of TβRI induced by Smurf2. HEK293T cells were transfected with the indicated plasmids. Cells were harvested after 24 h post-transfection. Western blotting was done with the indicated antibodies.D, PTPN3 and PTPN3 (D811A) attenuate ubiquitination of TβRI. HEK293T cells were transfected with the indicated plasmids. 24 h after transfection, IP and immunoblotting analysis were performed with the anti-FLAG antibody. Levels of TβRI ubiquitination and other proteins were examined by Western blotting with the indicated antibodies.E, PTPN3 blocks Smurf2-mediated ubiquitination of TβRI. HEK293T cells were transfected with the indicated plasmids, and treated with MG132 (20 μM, 4 h) before harvest. TβRI IP was performed with the anti-HA antibody, and TβRI ubiquitination was determined by Western blotting with the anti-Myc antibody. Protein levels were examined by Western blotting with the indicated antibodies.F, Depletion of Smurf2 reverses the shPTPN3-induced degradation of TβRI. HEK293T cells were transfected with expression plasmids for shPTPN3, shSmurf2 and HA-TβRI. 48 h post-transfection, cells were harvested for immunoblotting analysis. TβRI level was determined by Western blotting with the anti-HA antibody. Levels of other proteins were done by Western blotting with the indicated antibodies.G, Dominant negative Smurf2 mutant C716A prevents shPTPN3-induced TβRI degradation. HaCaT cells stably expressing shPTPN3 were transfected with FLAG-Smurf2 (C716A). Cells were harvested for Western blotting with anti-TβRI, anti-FLAG, anti-PTPN3 and anti-GAPDH antibodies.
Figure 4A, PTPN3 interacts with TβRI at endogenous levels. HaCaT cells were harvested after TGF-β treatment (2 ng/mL, 1 h) and then subjected to IP by PTPN3 antibody or control IgG. PTPN3 and TβRI were detected by Western blotting.B, Both PTPN3 and PTPN3 (D811A) interact with TβRI. FLAG-TβRI was co-transfected with HA-PTPN3 or HA-PTPN3 (D811A) into HEK293T cells. Cell lysates were harvested and subjected to IP with FLAG antibody. PTPN3, PTPN3 (D811A) and TβRI were detected by Western blotting with appropriate antibodies.C, The FERM domain of PTPN3 is necessary for its binding to TβRI. FLAG-TβRI and HA-PTPN3 (wildtype or truncations) were co-transfected into HEK293T cells. Cells were harvested after 24 h and subjected to IP by HA antibody. TβRI, PTPN3 and PTPN3 truncations were detected by Western blotting with appropriate antibodies.E, Knockdown of endogenous PTPN3 promotes the Smad7-TβRI association. HEK293T cells were transfected with the indicated plasmids and treated with MG132 (20 µM) for 4 h before harvested. SFB-Smad7 proteins were retrieved with the Streptavidin pulldown. Levels of TβRI and other proteins were examined by Western blotting with the indicated antibodies.F, PTPN3 and PTPN3 (D811A) abolish the interaction between TβRI and Smurf2 in HEK293T cells. HEK293T cells were co-transfected with plasmids as indicated. 20 h later, cells were treated with MG132 (20 μM) for 4 h, followed by IP and Western blotting.
Figure 5A, PTPN3 wildtype, phosphatase-dead D811A and ICC-derived mutant L232R exhibit similar patterns of subcellular localization and co-localization with TβRI. HaCaT cells were transfected with HA-TβRI and Flag-PTPN3 (wildtype or its mutants). 24 h later, cells were harvested for immunofluorescence with the indicated antibodies. Scale bar = 10 μm.B, PTPN3 (L232R) does not increase the TβRI protein level. TβRI and PTPN3 were determined by Western blotting in HaCaT cells stably expressing PTPN3, PTPN3 (D811A) or PTPN3 (L232R).C, PTPN3 (L232R) fails to rescue the Smurf2-mediated degradation of TβRI. HEK293T cells were transfected with FLAG- TβRI, Myc-Smurf2 and the increasing anount of PTPN3 (wildtype and mutants). Cells were harvested 24 h post-transfection. Protein levels were examined by Western blotting with the indicated antibodies.D, PTPN3 (L232R) does not block the interaction between TβRI and Smurf2. HEK293T cells were co-transfected with plasmids as indicated. 20 h later, cells were treated with MG132 (20 μM) for 4 h and analyzed by IP-Western blotting.E, Ectopic expression of PTPN3 wildtype and PTPN3 (D811A), but not PTPN3 (L232R), completely abolishes the Smad7-TβRI interaction. HEK293T cells were co-transfected with plasmids as indicated. 20 h later, cells were treated with MG132 (20 µM) for 4 h, followed by IP and Western blotting.F, PTPN3 and PTPN3 (D811A), but not PTPN3 (L232R), attenuate ubiquitination of TβRI. HEK293T cells were transfected with the indicated plasmids. 24 h after transfection, IP-Western blotting analysis was performed with anti-Flag antibody IP and followed by Western blotting with the indicated antibodies.
Figure 6A, PTPN3 and PTPN3 (D811A), but not PTPN3 (L232R), enhance Smad2 and Smad3 phosphorylation. HaCaT cells were stimulated with TGF-β (2 ng/mL) for 1 h. Levels of P-Smad2, P-Smad3, Smad2, Smad3, PTPN3 and GAPDH were detected by Western blotting.B, PTPN3 (L232R) inhibits TGF-β-induced reporter gene activity. HepG2 cells were transfected with expression plasmids for PTPN3, PTPN3 mutants and CAGA-luc reporter, and Renilla-luc reporter. Cells were harvested for luciferase assay after 8 h of TGF-β (2 ng/mL) treatment. Data are shown as mean ± SEM; n = 3. Statistical analysis was performed using two-tailed Student's t-test. *P<0.05, **P<0.01.C, PTPN3 and PTPN3 (D811A), but not PTPN3 (L232R), enhance TGF-β-induced growth inhibitory effect. HepG2 cells stably expressing PTPN3, PTPN3 (D811A) or PTPN3 (L232R) were treated with or without TGF-β (1 ng/mL) for indicated days. Cells were analyzed for cell proliferation by MTS assay. Data are shown as mean ± SEM; n = 3.D, Depletion of PTPN3 attenuates TGF-β-induced growth inhibitory effect. HepG2 cells stably expressing shPTPN3 were treated with or without TGF-β (1 ng/mL) for indicated days. Cells were analyzed for cell proliferation by using MTS assay. Data are shown as mean ± SEM; n = 3.E, PTPN3 (L232R) attenuates TGF-β-induced growth inhibition on colony formation in HepG2 cells. Cells were treated with or without TGF-β (1 ng/mL) treatment for 10 days. Clonogenic assay Quantification of the results in clonogenic assays was analyzed by Image J. Data are shown as mean ± SEM; n = 3.F, Depletion of PTPN3 attenuates TGF-β-induced growth inhibitory effect in HepG2 cells. Cells with stable knockdown of PTPN3 were treated with or without TGF-β (1 ng/mL) for 10 days. Clonogenic assay Quantification of the results in clonogenic assays were analyzed by Image J. Knockdown efficiency of PTPN3 in HepG2 cells were analyzed by Western blotting with the anti-PTPN3 antibody. Data are shown as mean ± SEM; n = 3. G, Depletion of PTPN3 attenuates TGF-β-induced growth inhibitory effect in Huh7 cells. Experiments and analysis were similarly done as in (F). Data are shown as mean ± SEM; n = 3.
Figure 7A, PTPN3, PTPN3 (D811A) and PTPN3 (L232R) are similarly expressed in Huh7 stable cell lines. Expression levels of indicated proteins were detected with appropriate antibodies in Western blotting.B, PTPN3 and PTPN3 (D811A), but not PTPN3 (L232R), attenuates tumorigenesis. Luciferase-harboring Huh7 tumor cells (2 × 106 cells/mouse) expressing PTPN3, PTPN3 (D811A) or PTPN3 (L232R) or empty vector (served as negative control) were subcutaneously injected into 5-week-old nude mice. Twenty days after injection, mice were analyzed by bioluminescence using Xenogen IVIS imaging system. Tumors expressing luciferase is indicated by radiance bar (p/sec/cm2/sr). C, Quantitation of bioluminescence with data from (B). Data are shown as mean ± SEM; n = 5. D, Depletion of PTPN3 accelerates tumorigenesis. HepG2 cells stably expressing shPTPN3 or shControl were subcutaneously injected into nude mice. Fifty days after cell implantation, tumors were dissected and photographed.E, Depletion of PTPN3 increased tumor sizes. Tumor volume was measured at indicated days post-implantation. Data are shown as mean ± SEM; n = 6 for each group. F, Depletion of PTPN3 increased tumor weight. Weight from all tumors was recorded from both control and shPTPN3 groups. Data are shown as mean ± SEM; n = 6 for each group. , PTPN3 depletion impairs TGF-β signaling in tumors. Levels of PTPN3, GAPDH and TGF-β signaling associated proteins, such as TβRI, P-Smad2, P-Smad3, Smad2/3, Smad4, PAI-1, c-Myc and p15 in tumors were analyzed by Western blotting analysis.H, Clinical significance of PTPN3 expression in LIHC based on TCGA database. In the boxplots, Y-axis represents the expression level of PTPN3 in normal and tumor samples. The boxes show the median (horizontal line in the box) ± 1 quartile; the upper and lower box limits represent the upper and lower quartiles, respectively. The whiskers (vertical lines) extend from the hinge to the smallest or larget value within 1.5 interquartile range from the box boundaries.
Figure 1(B) Structured illumination microscopy image of perimCherry/cytoGFP E. coli confirming localization of mCherry (red) in the periplasm and GFP (green) in the cytosol. Scale bar = 3 µm.(C) Outer membrane damage (mCherry intensity) and inner membrane damage (% Sytox positive) of perimCherry/cytoGFP E. coli bacteria exposed to (different concentrations of) human serum. Inner membrane damage correlates with killing (samples where bacteria are killed are indicated with gray shadings and a cross, see CFU data in Fig EV1b). Data information: (C-E) Data represent mean ± SD of 3 independent experiments.(D) Serum-induced inner membrane damage (% Sytox positive) of different Gram-negative strains depends on MAC components C5 and C8, but not on lysozyme (10% serum). Dotted line represents the detection limit of the assay. Data information: (D, E) The cfu/ml (Fig. 1E, 2C) and sytox measurements (Fig. 1D, 2E) of "Buffer", "Serum", "ΔC5", "ΔC8" "Δlysozym" and "C5b6MAC" were all generated from the same experiment. (C-E) Data represent mean ± SD of 3 independent experiments. (D, E) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as * p≤0.05, ** p≤0.01, *** p≤0.001 or **** p≤0.0001., E Serum-induced killing (CFU/ml) of different Gram-negative strains depends on MAC components C5 and C8, but not on lysozyme (10% serum). Dotted line represents the detection limit of the assay. Data information: (D, E) The cfu/ml (Fig. 1E, 2C) and sytox measurements (Fig. 1D, 2E) of "Buffer", "Serum", "ΔC5", "ΔC8" "Δlysozym" and "C5b6MAC" were all generated from the same experiment. (C-E) Data represent mean ± SD of 3 independent experiments. (D, E) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as * p≤0.05, ** p≤0.01, *** p≤0.001 or **** p≤0.0001.
Figure 2(B) Lysis of human erythrocytes after exposure to a concentration range of preassembled C5b6 in the presence of 100 nM C7. After washing, erythrocytes were exposed to 20 nM C8 and 100 nM C9 for 30 minutes after which the OD405 nm of the supernatant was measured. (B-E) Data represent mean ± SD of 3 independent experiments.C) Bacterial viability of three Gram-negative strains after exposure to buffer, 10% human serum or C5b6MAC. Buffer and serum conditions are the same as Fig. 1E.(D) Permeabilization of the outer, but not inner membrane of perimCherry/cytoGFP E. coli cells exposed to C5b6MAC (different concentrations of C5b6 with fixed concentrations of C7-C9). (B-E) Data represent mean ± SD of 3 independent experiments.E) Inner membrane damage of three Gram-negative strains exposed to buffer, 10% serum or C5b6MAC. Buffer and serum conditions are the same as Fig. 1D.
Figure 3(B) Bacterial viability of convertase-labeled bacterial strains exposed to buffer (Conv) or C5-C9 (Conv-MAC). Data information: (B-E) Data represent mean ± SD of 3 independent experiments. (B, D, E) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as * p≤0.05, ** p≤0.01, *** p≤0.001 or **** p≤0.0001.(C) Bacterial viability of convertase-labeled E. coli MG1655 exposed to a concentration range of C5 in the presence of 100 nM C6, 100 nM C7, 20 nM C8 and 100 nM C9. 'Ctrl' indicates bacteria that are pretreated with heat-inactivated ΔC5 serum. Dotted line represents the detection limit of the assay. Data information: (B-E) Data represent mean ± SD of 3 independent experiments.(D) Bacterial viability of convertase labeled E. coli MG1655 exposed to C5-C9 or conditions lacking one MAC component. As an extra control, convertase formation was blocked during ΔC5 serum incubation by adding 5 µM compstatin. Data information: (B-E) Data represent mean ± SD of 3 independent experiments. (B, D, E) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as * p≤0.05, ** p≤0.01, *** p≤0.001 or **** p≤0.0001.(E) Bacterial viability of E. coli MG1655 exposed to FB depleted serum in the presence of 20 µg/ml OmCI (to deposit C4b and C3b without Bb). After washing, bacteria were exposed to C5-C9 in the presence or absence of C1 and C2 (to generate classical pathway C5 convertases, C4b2aC3b). Data information: (B-E) Data represent mean ± SD of 3 independent experiments. (B, D, E) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as * p≤0.05, ** p≤0.01, *** p≤0.001 or **** p≤0.0001.
Figure 4(A) Outer membrane damage (mCherry intensity) and inner membrane damage (% Sytox positive) of convertase-labeled perimCherry/cytoGFP E. coli cells incubated with a concentration range of C5 and fixed concentrations of C6-C9. Data information: (A-C) Data represent mean ± SD of 3 independent experiments.(B) Inner membrane damage of perimCherry/cytoGFP E. coli exposed to a concentration range of ΔC5 serum and, after washing, to C5-C9. As controls, bacteria were incubated with heat inactivated ΔC5 serum or 5 µM compstatin was added to the ΔC5 serum to block C3b deposition. Data information: (A-C) Data represent mean ± SD of 3 independent experiments.(C) Inner membrane damage of three different convertase-labeled bacteria exposed to buffer (Conv) or C5-C9 (Conv-MAC). Data information: (A-C) Data represent mean ± SD of 3 independent experiments. (C) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as * p≤0.05 or ** p≤0.01.(D) Confocal microscopy images of convertase-labeled perimCherry/cytoGFP E. coli exposed to buffer (Conv) or C5-C9 (Conv-MAC). Unlabeled bacteria exposed to 1% serum served as control. Green = GFP, Red = To-pro-3 DNA dye. Scale bars = 3 µm.
Figure 5(B) Bacterial viability of convertase-labeled E. coli MG1655 exposed to Buffer (Conv), preassembled C5b6 (Conv + C5b6MAC) or a mixture of C5 and C6 (Conv-MAC), in the presence of C7, C8 and C9. Dotted line represents the detection limit of the assay. Data information: (B-D) Data represent mean ± SD of 3 independent experiments. (B) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as ** p≤0.01.(C) Inner membrane damage (% Sytox positive) of convertase-labeled perimCherry/cytoGFP E. coli exposed to a concentration range of preassembled C5b6 or a mixture of C5 and C6, in the presence of 100 nM C7. After washing, bacteria were exposed to 20 nM C8 and 100 nM C9. Data information: (B-D) Data represent mean ± SD of 3 independent experiments. (B) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as ** p≤0.01.(D) outer membrane damage (mCherry) of convertase-labeled perimCherry/cytoGFP E. coli exposed to a concentration range of preassembled C5b6 or a mixture of C5 and C6, in the presence of 100 nM C7. After washing, bacteria were exposed to 20 nM C8 and 100 nM C9. Data information: (B-D) Data represent mean ± SD of 3 independent experiments. (B) Statistical analysis was done using a ratio paired two-tailed t-test and displayed only when significant as ** p≤0.01.
Figure 7(A) Outer and inner membrane damage of convertase-labeled bacteria exposed to different combinations of MAC components. '@' indicates a washing step. Data information: Data represent mean ± SD of 3 independent experiments. (A) Statistical analysis was done using a one-way ANOVA and displayed only when significant as ** p≤0.01 or **** p≤0.0001.(B) Outer and inner membrane damage of convertase-labeled bacteria exposed to C5-C8 and after washing, to a concentration range of C9. Data information: Data represent mean ± SD of 3 independent experiments.
Figure 8(A) Convertase-labeled bacteria were exposed to a concentration range of either preassembled C5b6 (C5b6MAC) or a mixture of C5 and C6 (Conv-MAC), in the presence of 100 nM C7. After washing, 20 nM C8 and 100 nM C9-Cy3 was added. Controls at 0 nM C5b6 or C5-C6 confirm that the detected C9-Cy3 deposition is specifically related to MAC formation (solid lines). Proper insertion of pores was assessed by a previously described shaving method with trypsin (Moskovich & Fishelson, 2007). Bacteria were first incubated with MAC components for 30 minutes and subsequently treated with 20 µg/ml trypsin for 15 min at 37°C (dotted lines). Data information: (A) Data represent mean ± SD of 3 independent experiments.(B) Convertase labeled perimCherry/cytoGFP bacteria (Green) exposed to C5b6MAC or Conv-MAC. Conditions were similar to those in (A), however C9-Cy5 was used to detect MAC pores (Red). 100 nM of C5 and C6 or C5b6 were used in combination with 100 nM C7, 20 nM C8 and 100 nM C9-Cy5. Conv + C5b6MAC and conv-MAC images were taken in separate experiments in which laser settings were adjusted to the staining intensity of C9-Cy5 to properly visualize pore distribution. Scale bars = 3 µm.(C Atomic force microscopy analysis of E. coli BL21 and MG1655 immobilized using the Poly-L-Lysine protocol. (C) Entire bacteria and high-resolution comparisons of untreated and convertase-labeled E. coli BL21 exposed to C5-C9 (Conv-MAC) for 10 minutes. Scale bars: 800 nm (left) and 30 nm (right). Height Scales: 1.01 µm (left), 8 nm (top right), 22 nm (bottom right). Width of magnification boxes (left): 42 nm, height scales: 8 nm (top left) and 13 nm (bottom left). Arrows highlight E. coli porin structures, an asterisk highlights the C5b-7 stalk. Height profiles (bottom) are shown for the white dashed lines in the images.(D) Atomic force microscopy (height and phase images) of convertase-labeled E. coli MG1655 exposed to a mixture of C5 and C6 (Conv-MAC) or preassembled C5b6 (Conv + C5b6MAC), in the presence of C7, C8, C9, FB and FD. Images were generated in the same experiment. Scale bars: 50 nm. Height scales: 15 nm.