EMBO/SourceData huggingface dataset:
Figure 2Kinetic characterization of the rhodopsin dark state. Thermal decay of dark state rhodopsin: A) WT, B) T94I and C) G90D rhodopsin. The spectra are normalized to the OD280 and OD500/OD480 at t=0. D) Absorption maximum plotted as a function of time and fitted to a single exponential decay.Retinal isomerization in the rhodopsin dark state: E) WT, F) T94I and G) G90D rhodopsin, H) The fraction of 11-cis retinal is plotted as a function of time and fitted to a single exponential decay.SB stability in dark state rhodopsin: I) WT, J) T94I and K) G90D rhodopsin. L) OD440 is plotted as a function of time and fitted to a single exponential decay. All decay rates were measured at 55 C.
Figure 3Accelerated molecular dynamic simulation of the rhodopsin dark state: WT, G90D2.57, T94I2.61 and T94I2.61 with protonated E1133.28. In the absence of the G90D2.57 and T94I2.61 dark state structure, both aspartate and isoleucine were placed in the WT (1GZM [48]) using a favorable rotamer without introducing major clashes with the rest of the protein. However, both isoleucine and aspartate in the dark state structures introduced clashes with several amino acids and were therefore optimized using energy minimization before simulation. WT simulation was done with the protonated SB while in the G90D2.57 system, both E1133.28 and SB were protonated [36]. The protonated state of E1133.28 was unknown in T94I2.61, therefore simulation were done for both deprotonated and protonated E1133.28. The T94I2.61 dark state conformation with deprotonated E1133.28 was similar to that of the WT and was stable, whereas the dark state of G90D2.57 and T94I2.61 with protonated E1133.28 was unstable with a concomitant movement of E1133.28 residue away from the SB, thereby, causing movement of TM3 and opening of the E1133.28-SB activation switch.In contrast to the crystal structures the orientation of the retinal -ionone ring in the simulations was variable with respect to the polyene chain. This indicates a degree of positional freedom within the hydrophobic binding pocket.
Figure 3B Size exclusion chromatography confirms that the oligomerisation tendency of FICDR371S is unperturbed relative to wild-type FICD. Across a range of assessable enzyme concentrations both FICDs elute as predominantly dimeric species. The elution profile of a monomeric FICDL258D-H363A mutant is also shown for reference, alongside the elution times of molecular weight standards.C Representative immunoblot comparing the ability of wild-type and Arg371Ser FICD (at a wide range of enzyme concentrations) to catalyse the accumulation of BiP-AMP in the presence of physiological ATP concentrations (5 mM). At low enzyme concentrations (and early time points) the AMPylation defect imposed by Arg371Ser is manifest. At higher enzyme concentrations where the deAMPylation activity of the wild-type enzyme begins to dominate, the residual AMPylation activity of FICDR371S results in a greater accumulation of BiP-AMP (relative to the same concentration of wild-type enzyme). D Quantification of the AMPylated BiP signals relative to total BiP of experiments as in C (mean values ± SEM, n = 4, biological replicates).F Representative immunoblot comparing the accumulation of BiP-AMP in reactions constituted with the indicated concentrations of wild-type and Arg371Ser FICD, performed as in A (upper panel). The lower panel is a Coomassie-stained gel of the reaction constituents. An N-terminally extended version of the wild-type enzyme (residues 45-458was used in lanes 2 and 5-7, to distinguish its migration on the gel from the mutant (residues 104-445). The bar diagram provides quantification of the AMPylated BiP signals relative to total BiP of experiments as in F (from n = 3, biological replicates, mean values ± SEM).
Figure 4A Immunoblots of AMPylated proteins detected with a pan-AMP antibody, BiP, FICD and eIF2α (a loading control) in lysates of FICD∆ CHO cells transiently transfected with plasmids encoding the indicated derivatives of FICD. Signals corresponding to AMPylated BiP, auto-AMPylated FICDE234G, total BiP, FICD and eIF2α are indicated. The novel species reactive with the anti-FICD antiserum in lysates of cells transfected with plasmids expressing FICDR371S (*) likely reflects a glycosylated isoform arising from the creation of a new glycosylation site at Asn369.C Quantification of the data from repeats of the experiment as shown in B. The upper two graphs show the percent of cells with high CHOP::GFP or high XBP::Turq for each transfection. The lower panel provides quantitation of the median fluorescence intensity for each reporter. Mean ± SD, n=4, biological replicates.
Figure 5B On the left are immunoblots of AMPylated proteins detected with pan-AMP, BiP and eIF2α (a loading control) reactive antibodies in lysates of cells of the indicated genotype. The cells were untreated or exposed to the protein synthesis inhibitor, cycloheximide (Cx, 100 µg/mL) for the indicated time. In the panel on the right are immunoblots of samples immunoprecipitated with a BiP-specific antiserum from the lysates of the samples shown on the left.C Immunoblots as in B in lysates of cells of the indicated genotype. The cells were untreated or exposed to the protein synthesis inhibitor, cycloheximide (Cx, 100 µg/mL) and/or thapsigargin (Tg) for the indicated periods prior to harvest. D Quantification of ratio of the BiP-AMP to total BiP signal (expressed in arbitrary units) of repeats of the experiment shown in C. Mean ± SD of the BiP-AMP signal normalized to total BiP signal from the same samples are depicted, (P values by two tailed t-test, n = 6, biological replicates).
Figure 6A Representative immunoblot of AMPylated proteins in FICD∆ CHO cells transiently transfected with expression plasmids encoding the indicated FICD enzymes (replicated three times). Note that the hyperactive E234G mutant bearing the K124E-H131A mutations that compromise its ability to interact with BiP, is nonetheless consistently auto-AMPylated.C Bar diagram of the amount of alkaline phosphatase [normalised to cytoplasmic luciferase (a transfection marker)] secreted from FICD∆ CHO cells co-expressing the indicated FICD enzymes. The K124E-H131A mutations that interfere with engagement of BiP as a substrate reverse the secretion defect imposed by the hyperactive FICD enzymes [Mean ± SD, P values by ANOVA with Šídák's multiple comparisons test, n = 8-16 (biological replicates)].
Figure 1WT and SNX10 KO Caco-2 cells were treated with indicated doses of OMVs for 24h. Protein expression of E-cadherin and SNX10 was determined by immunoblots (A) and quantified by ImageJ software (B) (n = 3 independent experiments). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.G, H Confocal images of E-cadherin staining in Caco-2 cells treated with OMVs (100 μg/mL) for the indicated time were captured (G), and the fluorescence intensity of E-cadherin staining was quantified by ImageJ software (H) (n = 3 independent experiments, n = 18 fields analysed). Scale bar: 20 μm. Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.
Figure 2A, B WT and SNX10 KO Caco-2 cells were treated with or without OMVs (100 μg/mL) for 24 h. The fold changes in mRNA levels of SNAI1 (encoding Snail) (A) and SNAI2 (encoding Slug) (B) in Caco-2 cells were determined by RT-qPCR. n = 6 independent experiments. Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. ns, not significant.C WT and SNX10 KO Caco-2 cells were treated with or without OMVs (100 μg/mL) for 24 h. Cytoplasmic and nuclear proteins were extracted for Snail and Slug determination by immunoblots.WT and SNX10 KO Caco-2 cells were treated with or without OMVs (100 μg/mL) for 24 h. quantiﬁed the percentage of Snail (E) or Slug (F)-positive nuclei respectively. Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. ***p < 0.001.H WT and SNX10 KO Caco-2 cells were transfected with Ad-vector or Ad-SNX10, followed by treatment with or without 100 μg/mL OMVs for 24 h. Proteins from nucleus, cytoplasm and total cell lysates were subjected to immunoblots with the indicated antibodies.
Figure 3C, D Levels of p-Lyn, Lyn, E-cadherin and SNX10 in WT and SNX10 KO Caco-2 cells treated with or without OMVs (100 μg/mL) for 24h were determined by immunoblots (C) and quantified by ImageJ software (D) (n = 3 independent experiments). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.E, F Caco-2 cells were transfected with Ad-vector or Ad-SNX10, followed by treatment with or without OMVs (100 μg/mL) for 24h. Lysates were extracted and subjected to immunoblots with the indicated antibodies (E) and quantified by ImageJ software (F) (n = 3 independent experiments). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.I Cytoplasmic and nuclear proteins were extracted from WT and SNX10 KO Caco-2 cells treated with or without Tolimidone (10 μM), and the indicated proteins were analyzed by immunoblots.
Figure 4D WT and SNX10 KO Caco-2 cells were treated with or without OMVs (100 μg/mL) for 24 h and then subjected to IP with anti-caspase-5 antibody.E Representative images of co-staining of Lyn and caspase-5 in WT and SNX10 KO Caco-2 cells treated with or without OMVs (100 μg/mL) for 24 h. Scale bar: 20 μm. F The co-localization of Lyn and caspase-5 was quantified by ImageJ software. n = 3 independent experiments, n = 18 fields analysed. Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. ***p < 0.001. H Lysates of Flag-tagged full-length SNX10 or its different truncated mutants transfected Caco-2 cells were subjected to immunoprecipitation.
Figure 5E, WT and SNX10 KO Caco-2 cells were treated with OMVs (100 μg/mL) for the indicated time and stained with antibodies against LPS and Rab5 (E). Scale bar: 20 μm.G LPS levels in the cell culture supernatants of WT and SNX10 KO Caco-2 cells stimulated by OMVs (100 μg/mL) for the indicated time were detected by LAL assay (n = 6 independent experiments). H LPS levels in the cytosolic and residual fractions of Caco-2 cells stimulated by OMVs (100 μg/mL) with or without chloroquine (CQ) (200 nM) or bafilomycin A1 (Baf A1) (50 nM) for the indicated time were detected by LAL assay (n = 6 independent experiments). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001; ns, not significant.
Figure 6C WT and SNX10 KO Caco-2 cells were treated with or without OMVs (100 μg/mL) for 24h and then subjected to IP with anti-PIKfyve antibody.D, E Co-staining of PIKfyve and caspase-5 in WT and SNX10 KO Caco-2 cells treated with or without OMVs (100 μg/mL) for 24 h (D). Anti-PIKfyve and anti-caspase-5 antibodies were used to detect endogenous PIKfyve and caspase-5 respectively. Scale bar: 20 μm. Colocalized PIKfyve and caspase-5 were quantified by ImageJ software (E) (n = 3 independent experiments, n = 18 fields analysed). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. ***p < 0.001.F Caco-2 cells were stimulated by OMVs (100 μg/mL) with or without apilimod (30 nM) for 24h. Proteins of lysates extracted from Caco-2 cells were subjected to immunoblots with the indicated antibodies.G, H Co-staining of PIKfyve and Rab5 in WT and SNX10 KO Caco-2 cells treated with or without OMVs (100 μg/mL) for 24 h (G). Anti-PIKfyve and anti-Rab5 antibodies were used to detect endogenous PIKfyve and Rab5 respectively. Scale bar: 20 μm. Colocalized PIKfyve and caspase-5 were quantified by ImageJ software (H) (n = 3 independent experiments, n = 18 fields analysed). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. ***p < 0.001.I LPS levels in the cytosolic and residual fractions of Caco-2 cells stimulated by OMVs (100 μg/mL) with or without apilimod (30 nM) for the indicated time were detected by LAL assay (n = 6 independent experiments). J Caco-2 cells transfected with control siRNA or CASP5 siRNA were treated with OMVs (100 μg/mL) for the indicated time. LPS levels in the cytosolic and residual fractions of Caco-2 cells were detected by LAL assay (n = 6 independent experiments). K LPS levels in the cytosolic and residual fractions of Caco-2 cells stimulated by OMVs (100μg/mL) with or without bafetinib (1μM) for the indicated time were detected by LAL assay (n = 6 independent experiments). Data information: Data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. ***p < 0.001.
Figure 7SNX10 conditional knockout (SNX10 cKO) mice with or without IL-10 KO background and littermate wild type (WT) mice with or without IL-10 KO background were compared (n = 6 animals, each group). B, C Length of colons from WT, SNX10 cKO, IL-10 KO and SNX10 cKO IL-10 KO mice was measured (B) and analysed (C) at the 16th week. Data information: data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.SNX10 conditional knockout (SNX10 cKO) mice with or without IL-10 KO background and littermate wild type (WT) mice with or without IL-10 KO background were compared (n = 6 animals, each group). E, F Representative H&E images of colon tissues of WT, SNX10 cKO, IL-10 KO and SNX10 cKO IL-10 KO mice at the 16th week were shown (E) and analyzed (F). Scale bar: 100 μm. Data information: data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.SNX10 conditional knockout (SNX10 cKO) mice with or without IL-10 KO background and littermate wild type (WT) mice with or without IL-10 KO background were compared (n = 6 animals, each group). G The content of TNF-α, IL-6, IL-12/IL-23 p40 and IL-17A in the serum of WT, SNX10 cKO, IL-10 KO and SNX10 cKO IL-10 KO mice at the 16th week were measured by ELISA. Data information: data are means ± SD. One-way ANOVA followed by Bonferroni post hoc test was used for statistical analyzes. *p < 0.05; **p < 0.01; ***p < 0.001.SNX10 conditional knockout (SNX10 cKO) mice with or without IL-10 KO background and littermate wild type (WT) mice with or without IL-10 KO background were compared (n = 6 animals, each group). J Protein expression of E-cadherin, p-Lyn and Lyn in colon epithelial tissues was determined by immunoblots.
Figure 1.(A) Quantification of cell death in 293 cells24 h after transfection with luciferase, p55/TNFR1, DRP-1 Δ73 or DAPk ΔCaM, and GFP. Graphs show the percentage of GFP-positive cells with altered cell morphology. (B) Photographs of GFP-positive cells cotransfected with luciferase (1), p55/TNFR1 (2), DRP-1 Δ73 (3), or DAPk ΔCaM (4).(C) Photographs showing the overlay of GFP and phase-contrast images of 293 cells24 h after transfection with GFP and luciferase (1) or with GFP- DAPk (2 and 3); both a blebbing GFP-DAPk-expressing cell (2, arrows indicate blebs) and spread nontransfected cells are shown (3).(D) Hoechst staining (4-6) of GFP-positive 293 cells (1-3) 60 h after cotransfection with GFP and DAPk ΔCaM (1 and 4), DRP-1 Δ73 (2 and 5), or p55/TNFR1 (3 and 6). Arrows point to condensed nuclei resulting from DRP-1 Δ73 or DAPk ΔCaM transfections (4 and 5).
Figure 2.(A) Scoring loss of mitochondrial membrane potential (ΔΨm). 293 cells expressing luciferase (black), DRP-1 Δ73 (pink), DAPk ΔCaM (purple), and Bax (green) were assayed for loss of mitochondrial membrane potential 24 h after transfection using flow cytometric analysis of TMRM fluorescence. The fraction of TMRM-negative cells calculated from three experiments is shown in the graph below. The small increase in TMRM fluorescence in the kinase-transfected cells is not statistically significant.(B) Scoring the release of cytochrome C from mitochondria. 293 cells cotransfected with luciferase (1 and 2), Bax (3 and 6), DRP-1 Δ73 (7 and 8), or DAPk ΔCaM (9 and 10) and GFP constructs were incubated for 24 h and immunostained using anti-cytochrome C antibodies. Cells were visualized for cytochrome C (left) or GFP (right) fluorescence. Bax-transfected spread (3 and 4) or blebbed (5 and 6) cells are shown. In fields that also contain nontransfected cells, arrows point to GFP-positive cytochrome C-stained cells.(C) Assessing the effects of Bcl-2 and Bcl-XL. 293 cells were cotransfected with luciferase, DRP-1 Δ73, DAPk ΔCaM, or Bax, and either Bcl-2 or Bcl-XL together with GFP. GFP-positive cells were visualized by fluorescent microscopy and scored for the appearance of cell death morphology 24 h after transfection. Total cell death refers to the sum of all morphological changes observed.
Figure 3.(A) Transmission electron micrographs of 293 cells transfected with luciferase (1) p55/TNFR1 (2a-2c), DRP-1 Δ73 (3a and 3b; part of fig. 3b is magnified on its right), and DAPk ΔCaM (4). The different stages of autophagic development are depicted as follows: immature autophagic vesicles (double arrow), mature autophagic vesicles and autolysosomes (black arrow), and residual bodies (dashed arrow). Empty vacuoles (white arrow) are also shown. Arrowheads show condensed and fragmented chromatin. m, mitochondria; g, Golgi apparatus. Bar, 1 μm.(B) Transmission electron micrographs of MCF-7 cells transfected with luciferase (1), p55/TNFR1 (2a-2c), DRP-1 Δ73 (3a and 3b), and DAPk ΔCaM (4). Immature autophagic vesicles (double arrow), autophagic vesicles (black arrow), and residual bodies (dashed arrow) are shown. Insets in B, 2b and 2c, correspond to empty vacuoles, whereas those in B, 3a and 4, correspond to autophagic vesicles. Arrowheads show condensed and fragmented chromatin. m, mitochondria; dm, darkened mitochondria; n, nucleus; g, Golgi apparatus; v, vacuoles; ly, lysosomes; er, endoplasmic reticulum.
Figure 4.(A) Quantification of autophagy in 293 and MCF-7 cells. Graphs show the percentage of MDC-positive cells resulting from luciferase or DRP-1 Δ73 transfections (mean ± SD calculated from triplicates of 100 cells each; note that total cell number comprises transfected and nontransfected cells). These experiments were repeated three times with reproducible results.(B) Photographs of MDC-stained MCF-7 cells from the same experiment shown in A. Arrows point to MDC-positive cells. Transfections: luciferase (1a and 1b) and DRP-1 Δ73 (2a and 2b) at low (a) and high (b) magnifications.
Figure 5.(A) Quantification of cell death-associated morphologies in 293 cells. Graphs show the percentage of cells harboring all spectrum of morphological changes occurring as a result of luciferase, p55/TNFR1, DRP-1 Δ73, or DAPk ΔCaM transfections in the presence or absence of the caspase inhibitors BD-fmk or z-VAD-fmk (100 μM; mean ± SD calculated from triplicates of 100 cells each). This experiment was repeated three times with reproducible results.(B) Quantification of cell death-associated morphologies in MCF-7 cells. Experimental conditions were performed as in A in the presence or absence of BD-fmk (100 μM).(C) Graphs show the percentage of cells harboring the complete spectrum of death-associated morphological changes occurring as a result of cotransfections of luciferase, p55/TNFR1, DRP-1 Δ73, or DAPk ΔCaM with the caspase inhibitor crmA or control luciferase vector (mean ± SD calculated from triplicates of 100 cells each). Immunoblot shows the expression levels of transfected HA-tagged DAPk and DRP-1 Δ73, confirming that cotransfection with crmA did not alter expression of the death-inducing proteins.(D) Transmission electron micrographs of 293 cells transfected with p55/TNFR1 (1) or DRP-1 Δ73 (2a and 2b; parts of these figures are magnified at the right) and treated with the caspase inhibitor BD-fmk (100 μM). Immature autophagic vesicles (double arrow), autophagic vesicles (black arrow), and autolysosomes (white arrow) are shown. m, mitochondria; g, Golgi apparatus.(E) Western blots of cell lysates prepared from HeLa cells transfected with luciferase, p55/TNFR1, DRP-1 Δ73, or DAPk ΔCaM and GFP and incubated for 24 h. Blots were reacted with anti-PARP antibodies, anti-caspase-8 antibodies, anti-caspase-3 antibodies, anti-HA antibodies for DRP-1 Δ73 and DAPk ΔCaM detection, and anti-β-tubulin antibodies to quantitate protein loading.
Figure 6.(A) 293 cells were cotransfected with p55/TNFR1 in combination with DAPk death domain fused to GFP or DRP-1 K42A and pEGFP-N1 vector. A control luciferase vector was also used. GFP-positive cells were visualized by fluorescent microscopy and scored for the appearance of membrane blebbing 24 h after transfection.(B) Photographs of the various categories of p55/TNFR1-transfected 293 cells: spread cells (1), blebbed cells (2), condensed cells (3), cells displaying a fragmented cytoplasm (4), and cells carrying fragmented nuclei within a noncondensed cytoplasm (5). (C) Quantification of each death morphology observed 24 h after transfection with GFP, p55/TNFR1, and either luciferase or DRP-1 K42A.
Figure 7.(A and B). Quantification of autophagy in MCF-7 cells. MCF-7 cells were transfected with luciferase or FLAG-DRP-1 K42A followed by steroid withdrawal (serum starvation plus 10−6 M tamoxifen treatment) (A) or by serum and amino acid starvation (B) (mean ± SD calculated from triplicates of 100 cells each). These experiments were repeated three times with reproducible results. Proteins extracted from the transfected cells were subjected to Western blot analysis with anti-FLAG and anti-β-tubulin antibodies.(C) Photographs of the MDC-stained steroid withdrawn MCF-7 cells taken from the same experiment shown in A. Transfections: luciferase (1a and 1b) and DRP-1 K42A (2a and 2b) at low (a) and high (b) magnifications.
Figure 8.(A) Photographs of MDC-stained MCF-7 cells. (Top) Steroid withdrawal. Cells were either grown in complete medium (1), steroid depleted (2), or steroid depleted in the presence of the broad caspase inhibitor BD-fmk (100 μM) (3) for 3 d. (Bottom) amino acid starvation. Cells were either grown in complete medium (1-3) or under amino acid starvation condition (4-6) without (1 and 4) or with (2 and 5) the presence of the broad caspase inhibitor BD-fmk (100 μM) or the general inhibitor of autophagy 3-methyladenine (10 mM) (3 and 6) for 3 d.(B) PARP cleavage in MCF-7-starved cells. Proteins extracted from 4-d steroid-depleted (left) or 12-h TNF-α-treated (100 ng/ml) cells (right) were subjected to Western blot analysis with anti-PARP antibodies. The proteins were prepared from the same experiment shown in A.(C) Graph showing the cumulative phase microscopy scores of dead (shrunk and detached) MCF-7 cells in tamoxifen-treated (filled) or nontreated (unfilled) cultures in the presence (▴) or absence (•) of the indicated caspase inhibitors (25 μM).