EMBO/SourceData huggingface dataset:
Figure 6A. Stable expression of Myc-tagged wild-type, PIP-box mutant, and catalytic inactive HUWE1 variants in HUWE1-knockout 293T cells. The Western blot shows that expression of the Myc-tagged variants stably transfected in the knockout cell lines, is similar to the endogenous HUWE1 expression.B. Myc-tag immunoprecipitation using extracts of the corrected cell lines described above. As expected, PCNA co-precipitates with wild-type, but not PIP-box mutant HUWE1 (FF).C. iPOND experiment using HUWE1-knockout 293T cells, corrected with wild-type or PIP-mutant HUWE1. The PIP-mutant shows reduced crosslinking to nascent DNA, indicated defective recruitment to replication forks.D. Clonogenic assay showing that stable expression of wild-type HUWE1, but not of the PIP box mutant or the catalytic mutant, corrects the HU sensitivity of the HUWE1-knockout 293T cells. Shown is the average of 3 independent experiments -/+SD. If not indicated otherwise, the p-values shown specify the statistical significance relative to 293T (for the 0.5mM HU condition). P-values are: 0.0003 (293T vs HUWE1-/-; 0.157 (293T vs HUWE1-/- +WT); 0.0045 (293T vs HUWE1-/- +FF); 0.0006 (293T vs HUWE1-/- +C4341A; 0.047 (HUWE1-/- +WT vs HUWE1-/- +FF).E. The S-phase arrest phenotype is also rescued by wild-type, but not PIP-mutant or catalytic mutant HUWE1. S-phase arrested cells were quantified using the BrdU/PI bi-dimensional flow cytometry assay. Shown is the average of 3 independent experiments -/+SD. The p-values shown specify the statistical significance relative to 293T (0.018, 0.957, 0.015, and 0.024 respectively). A quantification of the same data, showing the percentage of cells arrested in S-phase, is shown in Fig EV3A.F. Normal replication tract length, quantified using the DNA fiber assay, is restored by expressing wild-type, but not PIP-mutant HUWE1, in the HUWE1-knockout 293T cells. The "n" numbers of fibers analyzed (pooled from three independent experiments), as well as the mean +/- SEM, are indicated on the graphs. If not indicated otherwise, the p-values shown specify the statistical significance relative to 293T. P-values are: 1.47x10-11 (293T vs HUWE-/- samples), 0.094 (293T vs HUWE-/- +WT samples), 1.40x10-7 (293T vs HUWE-/- +FF samples), 1.22x10-7 (HUWE-/- vs HUWE-/- +WT samples), 0.679 (HUWE-/- vs HUWE-/- +FF samples).G. Alkaline Comet Assay showing that wild-type, but not the FF mutant can correct the breakage phenotype of HUWE1-knockout 293T cells. The "n" numbers of comet tails analyzed (pooled from three independent experiments), as well as the mean +/- SEM, are indicated on the graphs. The p-values indicated are: 4.18x10-43 (293T vs HUWE-/- samples), 6.89x10-41 (HUWE1-/- +WT vs FF samples), and 5.97x10-50 (HUWE1-/- +WT vs C4341A samples).
Figure 7A, B. The impact of HUWE1 on H2AX phosphorylation and ubiquitination, under normal conditions (A) or upon induction of replication stress (2mM HU for 18h, or 2h after exposure to 40J/m2 UV). Control or HUWE1-knockout HeLa cells were analyzed.C. In vitro ubiquitination assay showing that recombinant HUWE1C-ter can mono-ubiquitinate H2AX.D. Wild-type, but not the PIP-mutant can correct the defective H2AX ubiquitination in HUWE1-knockout 293T cells.. E. Chromatin immunoprecipitation showing that H2AX binding to the common fragile site FRA3B is reduced in HUWE1-knockout 8988T cells. Cells were treated with 600nM aphidicolin for 24h. Binding was quantified relative to input material. Shown is the average of 4 experiments -/+ SD. P-value is 4.4x10-6.F. Western blots showing that several H2AX ubiquitin ligases participate in H2AX ubiquitination following replication stress. HUWE1, RNF168, and BMI1 were knocked-down in HeLa cells. The efficiency of the knockdown is shown in Fig EV4. Cells were treated with 600nM aphidicolin for 24h, 2mM HU for 24h, or analyzed 2h after exposure to 40J/m2 UV.G. Chromatin immunoprecipitation from HeLa cells, showing that knockdown of H2AX ubiquitin ligases can reduce H2AX binding to FRA3B. Cells were treated with 600nM aphidicolin for 24h. Binding was quantified relative to input material. Shown is the average of 3 experiments -/+ SD. The p-values shown indicate the statistical significance relative to siControl (0.0016, 0.0005, and 0.0009 respectively).H. Chromatin fractionation experiments showing that HUWE1-knockout HeLa cells, treated with 2mM HU for 24h, fail to efficiently recruit BRCA1 and BRCA2 proteins to DNA. In contrast, 53BP1 chromatin association is not induced by HU treatment, and not affected by HUWE1 knockout, and thus can serve as loading control. Shown are blots of whole cell extract (WCE) samples, representing input material, and of chromatin pellet samples.
Figure 1B Recombinant MAVS-Region III-dimer (lanes 1-4), trimer (lanes 5-8) or tetramer (lanes 9-12) were subjected to IRF3 dimerization assay respectively in vitro. Increasing doses of recombinant MAVS-Region III were used and shown in Fig EV1C. Immunoblotting analysis was performed following Native-PAGE for the reaction mixture.C pcDNA3-based constructs expressing MAVS-Region III-dimer, trimer and tetramer were transfected into HEK293T cells respectively. ISG54 induction were measured thirty-six hours after transfection by quantitative PCR (qPCR).D Recombinant MAVS-Region III-dimer or tetramer were immunoprecipitated with anti-FLAG M2 beads with or without a preincubation with S100 from HEK293T cells following an experimental procedure outlined in Fig EV1G. The IP products were resolved in SDS-PAGE and a specific protein band pulled-down with MAVS-Region III-tetramer was indicated by an arrow. TRAF3IP3 was identified in the specific band by mass spectrometry.E Protein samples as described in (D) were subjected to immunoblotting analysis. The TRAF3IP3 band was indicated by an arrow and the asterisk indicated nonspecific bandsF pcDNA3-FLAG-TRAF3IP3 (full-length and truncated forms) and pcDNA3-HA-MAVS were transfected into HEK293T cells, which were harvested thirty-six hours post transfection. Co-IP experiments were performed with anti-HA antibody, followed by immunoblotting.G Human cells, including THP1, HeLa, HEK293, HEK293T as well as Traf3ip3-/- HEK293T, were lysed and subjected to immunoblotting to examine TRAF3IP3 expression.
Figure 2A Three pairs of small interfering RNA against TRAF3IP3 were transfected into HEK293T cells respectively and immunoblotting were then employed to examine the knockdown efficiency. A pair of scrambled RNA oligoes was transfected and signified as con.B Three pairs of si-TRAF3IP3 together with IFNβ-luciferase reporter were transfected into HEK 293T cells. Twenty-four hours after transfection, the cells were infected with (SeV) or without (mock) Sendai virus, which were harvested six hours post infection to measure the luciferase activity.C Si-TRAF3IP3 (oligo #1) were transfected into HEK 293 cells, which were then treated with mock, VSV, SeV, poly(I:C) or HSV-1. After various treatments, IFNB inductions were measured by qPCR.D Immunoblotting to detect TRAF3IP3 in wild type and Traf3ip3-/- HEK293T cells.E Wild type and Traf3ip3-/- HEK293T cells were treated with or without VSV, SeV or poly (I:C) as indicated for twelve hours. IFNB induction was measured by qPCR.F Wild type and Traf3ip3-/- HEK293T cells were infected with GFP-VSV. Fluorescent images were taken to examine GFP-VSV proliferation at eight hours post infection (left). Scale bar represents 10 micrometers. GFP-VSV titers were quantitated by plaque assay (right).G Various expression constructs were transfected into WT and Traf3ip3-/- HEK293T cells. Thirty-six hours after transfection, IFNB induction was measured by qPCR.H Mavs-/- HEK293T cells were transfected with empty vector, pcDNA-FLAG-MAVS, pcDNA-FLAG-MAVS-(Region III only), or pcDNA-FLAG-MAVS-(ΔRegion III), together with pcDNA3-FLAG-TRAF3IP3 or not as indicated. Twenty-four hours after transfection, cells were infected with SeV for twelve hours. IFNB induction was measured by qPCR.
Figure 3A The experiment was performed as described in Fig 2C. Instead of IFNB, ISG54 and IL6 inductions were measured by qPCR.B HEK293 cells were transfected with si-TRAF3IP3 oligos and then treated with various stimuli. Following subcellular fractionation, S5 fractions were obtained and subjected to native PAGE for detecting IRF3 dimer by immunoblotting. The whole cell lysates were also subjected to SDS-PAGE for anti- IRF3 and tubulin immunoblotting.C The experiment was performed as described in Fig 2E. ISG54 and IL6 induction was measured by qPCR.D Wild type and Traf3ip3-/- HEK293T cells were infected with or without VSV. At indicated time points, Cells were collected and analyzed by immunoblotting. Following subcellular fractionation, S5 fractions were subjected to native PAGE to examine IRF3 dimer, and P5 fractions contained mitochondria were subjected to SDD-AGE to examine MAVS aggregation. The mitochondrial outer membrane protein Prohibitin was immunoblotted as an internal control.
Figure 4A pcDNA-FLAG-TRADD and pcDNA-FLAG-TRAF3IP3 were transfected into HEK293T cells at increasing amount respectively. ISG54 and IL6 induction were measured thirty-six hours post-transfection by qPCR. Expression levels were shown in Fig EV4B. All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. *P<0.05, **P<0.01 and ***P<0.001 NS indicates no statistically significant difference.B HEK293T cells were transfected with pcDNA3-HA-TRAF3IP3, in combination with pcDNA3-FLAG- RIG-I, MAVS, TBK1, IRF3, TRAF2, TRAF3, TRAF5, or TRAF6 as indicated. Thirty-six hours after transfection, cells were collected and anti-HA immunoprecipitations were performed. IP products were subjected to immunoblotting.C shRNA targeting TRAF3IP3 (sh-TRAF3IP3) was transduced into Mavs-/- HEK293T cells. Twenty-four hours after transduction, cells were treated with puromycin (2 μg/mL) for forty-eight hours and then transfected with pcDNA3-FLAG-MAVS-(Region III only). Twenty-four hours after transfection, cells were infected with or without VSV for twelve hours. Cells were then collected and subjected to immunoprecipitation assay and immunoblotting.D Wild type and Traf3ip3-/- HEK293T cells were transfected with pcDNA3-FLAG-MAVS-(Region III only). Twenty-four hours post-transfection, cells were infected with or without VSV. Twelve hours post-infection, cells were collected and subjected to immunoprecipitation assay and immunoblotting.
Figure 5A Subcellular fractionation was performed for HEK293T cells infected with or without SeV to get three fractions, i.e., cytoplasm, membrane and nuclei extracts, which were then subjected to Immunoblotting analysis as indicated.B Membranous fraction obtained in Fig 5A were further separated into mitochondria, Golgi and ER extracts as described in methods, followed by immunoblotting analysis.C-E Immunofluorescent microscopic imaging for TRAF3IP3. HeLa cells were transfected with pcDNA3-FLAG-TRAF3IP3. Twenty-four hours after transfection, cells were infected with or without SeV for twelve hours. Anti-FLAG M2 (FITC) was used for immunofluorescence staining of FLAG-TRAF3IP3. Nuclei were stained with DAPI. Mitochondria was stained with Mitotracker Red (C). Calnexin (an ER protein) was stained for ER (D). GM130 (a Golgi protein) was stained for Golgi (E). Scale bar represents 5 micrometers. F Quantitative analysis of yellow color as shown in Fig 5C, D and E, indicating TRAF3IP3 localization on various organelles with or without virus infection. The quantification was performed with ImageJ. All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. ***P<0.001. NS indicates no statistically significant difference.
Figure 6BMDMs from wild type, Traf3ip3-/- and Mavs-/- mice were treated with or without VSV, SeV, poly (I:C) or HSV-1 respectively as indicated for six hours. Ifnb (A), Ifna4 (B), Il6 induction was measured respectively by qPCR. All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. *P<0.05 and **P<0.01. NS indicates no statistically significant difference.BMDMs from wild type, Traf3ip3-/- and Mavs-/- mice were treated with or without VSV, SeV, poly (I:C) or HSV-1 respectively as indicated for six hours. Il6 (C), Isg54 (D), and Cxcl10 (E) induction was measured respectively by qPCR. All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. *P<0.05 and **P<0.01. NS indicates no statistically significant difference.F BMDMs from wild type, Traf3ip3-/- and Mavs-/- mice were infected with or without VSV for six hours. Cells were then collected and following subcellular fractionation, S5 fractions were subjected to native PAGE to examine IRF3 dimer, and P5 fractions contained mitochondria were subjected to SDD-AGE to examine MAVS aggregation.
Figure 7Wild type, Traf3ip3-/- and Mavs-/- mice (three littermates per group) were infected intravenously with VSV at a MOI of 2×108. The spleens were collected 4 hours or 8 hours after infection and Ifna4 (A), Ifnb (B), Isg54 (C) and Il6 (D) inductions were measured respectively by qPCR. All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. *P<0.05 and **P<0.01. NS indicates no statistically significant difference.Wild type, Traf3ip3-/- and Mavs-/- mice (three littermates per group) were infected intravenously with VSV at a MOI of 2×108. The spleens were collected 4 hours or 8 hours after infection and VSV RNA levels were measured by qPCR (E). All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. *P<0.05 and **P<0.01. NS indicates no statistically significant difference.Wild type, Traf3ip3-/- and Mavs-/- mice (three littermates per group) were infected intravenously with VSV at a MOI of 2×108. The sera were collected from the treated mice and used for the measurement of IFNβ production by ELISA (F). All data are presented as the mean values based on three independent experiments, and error bars indicate s.d. P values were determined by unpaired two-tailed Student's t-test. *P<0.05 and **P<0.01. NS indicates no statistically significant difference.G Wild type, Traf3ip3-/- and Mavs-/- mice (n=6 each) were injected with VSV via tail vein injection at 5×107 pfu per mouse, and the survival rates were monitored for 15 days. P values were determined by unpaired two-tailed Student's t-test. *P<0.05
Figure 1| Representative analysis of B220 and IgM surface expression in bone marrow (left) and spleen cells (right) of mice from the indicated genotypes.Representative flow cytometric analysis of splenocytes from mice of the indicated genotypes (pre-gated on B cells: B220+/CD19+) for surface expression of IgM and the 3-83 idiotype (54.1). Shown data are representative 11 - 35 individual mice per genotype.PCR fragments amplified with specific primers for Vκ and Jκ5 from genomic DNA of purified splenic B cells from Ptenf/f x 3-83ki and Ptenf/f x mb1-cre x 3-83ki mice on the respective backgrounds. Genomic tail DNA from a 3-83ki mouse and DNA from purified splenic B cells of a control (ctrl) mouse were used as controls. PCR for the splicing factor Srp20 served as a loading control. Kb and Kd indicate the respective background of the mice, (H2-Kb: +Ag).
Figure 2A | Intracellular expression of IgM (Ig-μHC ic) in bone marrow (left) and spleen cells (right) was determined by flow cytometry and compared between the populations of B cells (green, identified by B220 and CD19 expression) and non-B cells (gray). Numbers in the histograms indicate the percentages of the positive populations. Figures are representative of 11 - 35 individual mice per genotype.B | Intracellular Ca2+ influx was measured in CD90.2/Thy1.2- splenocytes derived from mice of the indicated genotypes following stimulation with 10 μg/ml α-κLC antibody. Figures are representative of at least 3 individual mice per genotype.C | Serum IgM concentrations measured in mice of the indicated genotypes. Mean ±SD, symbols represent IgM concentrations from individual mice (n). Statistical significance was calculated by using the Kruskal-Wallis test (see also Table S1), n. s. = not significant; **** p ≤ 0.0001.D, E | Absolute numbers of B cells in bone marrow (D) and spleens (E) from mice of the respective genotypes, determined by B220/CD19 surface expression. Mean ±SD, symbols indicate the numbers of B cells in individual mice (n). Statistical significance was calculated by using the Kruskal-Wallis test (see also Tables S2-3), n. s. = not significant; * p ≤ 0.05; *** p ≤ 0.001; **** p ≤ 0.0001.
Figure 3Splenocytes from mice of the indicated genotypes, (A) Ptenf/f, Ptenf/f x mb1-cre and Ptenf/f x mb1-cre 3-83ki mice on the respective backgrounds were analyzed by flow cytometry. B cells were pre-gated by B220 and CD19 expression and the IgM/IgD surface expression (dot plots, left) was determined. Histograms (right) show a comparison of intracellular IgD expression (Ig-δHC ic) between the splenic populations of B cells (orange, identified by B220 and CD19 expression) and non-B cells (gray). Numbers in the histograms indicate the percentages of the positive populations. Data are representative of 11 - 35 individual mice per genotype.(B) Ptenf/f x MD4tg and Ptenf/f x mb1-cre x MD4tg mice in presence and absence of antigen (ML5tg), were analyzed by flow cytometry. B cells were pre-gated by B220 and CD19 expression and the IgM/IgD surface expression (dot plots, left) was determined. Histograms (right) show a comparison of intracellular IgD expression (Ig-δHC ic) between the splenic populations of B cells (orange, identified by B220 and CD19 expression) and non-B cells (gray). Numbers in the histograms indicate the percentages of the positive populations. Data are representative of 11 - 35 individual mice per genotype.C | Quantification of surface IgD mean fluorescence intensity (MFI) in Ptenf/f x MD4-trangenic mice in presence (mb1-cre +/+) and absence (mb1-cre +/ki) of Pten. Single dots represent the average MFI of 4 independent measurements per mouse (n), mean ±SD. Statistical significance was calculated by using an unpaired two-tailed t-test.D | Serum anti-HEL titers. Sera from MD4tg mice of the indicated genotypes were adjusted to an IgM concentration of 500 μg/ml and applied in triplicates to HEL-coated plates in dilution steps of 1 : 3, mean ±SEM. Statistical significance was calculated by using the Kruskal-Wallis test (see also Table S4). Statements of significance in the figure refer to the comparison between Ptenf/f x MD4tg (filled red squares) and Ptenf/f x MD4tg x MD5tg sera (filled orange triangles), ** p ≤ 0.01; *** p ≤ 0.001.E | Immunohistochemistry of sections from spleens of Ptenf/f, Ptenf/f x mb1-cre, Ptenf/f x mb1-cre x 3-83ki and Ptenf/f x mb1-cre x MD4tg mice for CD169 (green), CD5 (red) and IgM (cyan) at 10x magnification. Pictures in the second row show enlarged areas indicated by the white squares, respectively. Double-arrows indicate the distance between T cell (red) and marginal zone (green). Shown pictures are representative of 2 - 3 mice per genotype
Figure 4B | 3 days post transduction the surface expression of IgM/IgD (dot plots, top), IgD and CD23 (histograms, bottom) was measured by flow cytometry and compared between EV- and FoxO1-A3-transduced cells. Fluorescence minus one (FMO) stainings, lacking α-IgD or α-CD23 antibodies respectively, served as controls (ctrl). Bar diagrams below flow cytometry data display the percentages of IgD+ cells (n = 12; left) and MFI of CD23 (as relative units, RU), normalized to the MFI measured in the respective EV transduced cells; n = 12; middle). Fcer2 transcript levels were measured by qRT-PCR (right, n = 4). Mean ±SD, symbols indicate data from individual mice. Statistical significance of IgD expression was determined by applying the Wilcoxon matched-pairs signed rank test for CD23 and by applying the one sample two-tailed t-test for Fcer2 expression.C | Cstf64 (n = 8), Ell2 (n = 8) and Zfp318 (n = 11) expression levels were measured at 3 days post transduction by qRT-PCR. FoxO1-A3- and EV-transduced splenic B cells were FACS-purified according to the gating strategy Mean ±SD, symbols indicate the expression in individual mice. Statistical significance was calculated by using the one-sample two-tailed t-test.E: IgD (n = 6), CD23 (n = 4) and Fcer2 (n = 4).F: Cstf64 (n = 4), Ell2 (n = 4) and Zfp318 (n = 4).
Figure 5B | Representative flow cytometric analysis of Ramos cells reconstituted with HH10-mu IgM, HH10-mu IgD. Cells were stained with α-murine μHC-, δHC- and κLC-antibodies, respectively. EV-transduced HL-KO cells, expressing GFP only, were used as negative control (gray).C | Representative flow cytometric analysis of HEL-binding in reconstituted Ramos cells after staining with fluorescently-labeled HEL. EV-transduced HL-KO cells, expressing GFP only, were used as negative control (gray).D | Representative intracellular Ca2+ influx in HH10-mu IgM- and HH10-mu IgD-expressing cells upon stimulation with multivalent HEL (complex cHEL), monovalent (soluble sHEL) (both at a concentration of 1 μg/ml), or 10 μg/ml α-mouse κLC antibody, respectively.E | Representative intracellular Ca2+ influx of HH10-mu IgM- (top) and HH10-mu IgD- (bottom) expressing cells upon stimulation with indicated ratios of 1 μg/ml cHEL and sHEL, and a 1 : 25 mixture of cHEL with bovine serum albumin (BSA), where 1 = 1 μg/ml.F | Schematic overview of reconstitution of BCR-deficient Ramos (HL-KO) cells with HH10-specific human IgM (HH10-hu IgM) and IgD (HH10-hu IgD) BCR isotype. G - J | using HH10-hu IgM- and HH10-hu IgD-expressing cells instead of HH10-mu IgM- and HH10-mu IgD-expressing cells, respectively. Data shown in G to J are representative of minimum three independent experiments.
Figure 6A | Quantification of surface IgM (top) and IgD (bottom) MFI in B cells from mice of the indicated genotypes. Single dots represent the average MFI of 4 independent measurements per mouse (n), mean ±SD. Statistical significance was calculated by using the Kruskal-Wallis test n. s. = not significant; ** p ≤ 0.01; *** p ≤ 0.001; **** p ≤ 0.0001.| Representative intracellular Ca2+ influx measured in Thy1.2- splenocytes, derived from mice of the indicated genotypes, upon stimulation with cHEL, monovalent sHEL (both at a concentration of 1 μg/ml) or 10 μg/ml α-mouse κLC antibody, respectively. Line diagrams below the dot plots show the overlayed MFI of the Ca2+ influx kinetics displayed in the plots above.C | Quantification of intracellular Ca2+ influx The median area under the curve of the Ca2+ influx kinetics was calculated, single dots represent data from individual mice, mean ±SD. Statistical significance was calculated by applying the Mann-Whitney-U test n. s. = not significant, ** p ≤ 0.01.