EMBO/SourceData huggingface dataset:
Figure 4 (A) Ovaries of adult female flies (w1118, alix1 and alix-l/CyO; alix1) were stained with rhodamine-phalloidin (red), anti-α-tubulin (green), anti-Cnn (white) and Hoechst (blue). Typical confocal micrographs of metaphase FECs are presented and the apical membrane facing the egg chamber lumen is indicated with *. Scale bar, 5 μm. The MS orientation was measured and the graph shows the average percentage of FECs (w1118, n=45, alix1, n=45, alix-l/CyO; alix1, n=39, from three independent experiments) with the indicated relative spindle angle (±S.E). Statistically significant difference is indicated as ***p<0.001 (ANOVA)(C) Lysates of ovaries from w1118, alix1 and alix-l/CyO; alix1 flies were immunoblotted for ALIX, α-tubulin and GAPDH (loading control)(D) The MS orientation was determined in metaphase cells in organoids of Caco-2 cells transfected with control (n=75), ALIX (n=88) or NuMA (n=79) siRNA (from three independent experiments). The graph shows the average percentage of Caco-2 cells with the indicated relative spindle angle (±S.E). Greater spindle angle variation was observed in ALIX- and NuMA-depleted cells compared to control cells (***p<0.001, ANOVA). Representative confocal images are shown where the cells are stained with rhodamine-phalloidin (red), α-tubulin (green) and Hoechst (blue). The apical membrane facing the lumen of the organoid is marked (*). Scale bar, 5 μm(E) Lysates of control, ALIX or NuMA-depleted Caco-2 cells were immunoblotted for NuMA, ALIX, α-tubulin and GAPDH (loading control)
Figure 6 (A) The MS orientation was determined in metaphase NBs from brains dissected from wild type (w1118), alix1, γ−Tub23CPI or γ−Tub23CPI; alix1 larvae. Compared to w1118, significantly greater variation in the relative spindle angles was observed in alix1 NBs and γ−Tub23CPI; alix1 NBs (*p<0.05, ANOVA). The γ−Tub23CPI;alix1 NBs displayed significantly greater variation of their spindle orientations than either alix1 or γ−Tub23CPI NBs (*p<0.05, ANOVA). The graph shows the average percentage of NBs with the indicated relative spindle angles (±S.E) from in total 57 w1118 NBs, 55 alix1 NBs, 76 γ−Tub23CPI NBs and 62 γ−Tub23CPI; alix1 NBs (three independent experiments) (B) Lysates of the respective genotypes were immunoblotted for ALIX, γ-tubulin and GAPDH (loading control). The average expression of ALIX or γ-tubulin (relative to GAPDH) from three independent experiments is given below (±S.E) and significant differences are indicated as *p<0.05, Student's t-test(C) Dissected brains of w1118, alix1, γ−Tub23CPI and γ−Tub23CPI;alix1 larvae were subjected to MT regrowth assay and stained with anti-α-tubulin (red), anti-Cnn (white) and Hoechst (blue). Representative images of NBs after 0 and 60 seconds regrowth are presented. Scale bars, 5 μm(D) The MT-intensities after 0 and 60 seconds regrowth were determined, here presented as the average of three separate experiments (± S.E) where in total 27 w1118-0'', 28 w1118-60'', 26 alix1-0'', 19 alix1-60'', 28 γ−Tub23CPI-0'', 26 γ−Tub23CPI-60'', 28 γ−Tub23CPI;alix1-0'' and 23 γ−Tub23CPI;alix1-60'' NBs were analyzed. Compared to w1118-NBs, significantly less MT polymerized in alix1, γ−Tub23CPI or γ−Tub23CPI;alix1 NBs (*p<0.05, ANOVA)(E) The relative spindle angle between the polarity axis perpendicular to the apical phalloidin-stained F-actin surface and the MS was determined in metaphase Caco-2 cysts cells transfected with control, ALIX and/or γ-tubulin siRNA (29, 29, 18 and 32 metaphase cells, respectively, were analyzed from three separate experiments). Compared to control cells, depletion of either ALIX or both ALIX and γ-tubulin, induced a significantly increased randomization of the relative spindle angles (**p<0.01 and ***p<0.001, ANOVA). Caco-2 cells depleted of ALIX+γ-tubulin showed a greater variation in the spindle angles compared to depletion of ALIX or γ-tubulin (*p<0.05, ANOVA). ALIX-depleted cells showed greater spindle angle-variation than γ-tubulin-depleted cells (*p<0.05, ANOVA)(F) Efficient knockdown of ALIX and γ-tubulin relative to GAPDH (loading control) was verified by Western blotting analysis, and the average expression of ALIX or γ-tubulin relative to GAPDH (±S.E) is given below (*p<0.05, Student's t-test)
Figure 8 (A) HeLa cells transfected with control or ALIX siRNA were fixed, permeabilized and stained with anti-MAP1S (red), anti-γ-tubulin (white) and Hoechst (blue). Interphase cells are shown and the insets show close ups of the centrosomes. Scale bars, 5 μm. (B) The fluorescence intensity of centrosomal MAP1S was determined and the graph shows the average of three independent experiments (± S.E), in which in total 52 control and 36 ALIX siRNA cells were analyzed. Significant difference is indicated as *p<0.05 (Student's t-test) (C) HeLa cells were transfected with control, ALIX, MAP1S or ALIX+MAP1S siRNA and the expression of ALIX, MAP1S and GAPDH (loading control) was determined by Western blotting analysis. Representative results are presented(D, E) Cells treated as in C were immunostained with anti-α-tubulin (white), Hoechst (blue) (D Scale bars, 5 μm. The intensities of astral MTs relative to total MTs were determined from confocal microscopy images and the graph in (D) shows the average of four separate experiments (10 cells per condition/experiment) (±S.E). *p<0.05 and **p<0.01, Student's t-test(D, E) Cells treated as in C were immunostained wit anti-acetylated tubulin (green) (E) The relative intensity of acetylated MT relative to total MT was determined in (E) The average of four separate experiments (10 cells per condition/experiment) is graphically presented (±S.E). Significant differences are indicated as *p<0.05 (Student's t-test)(F) The regrowth of MTs (i.e total tubulin intensity) was assessed in cells incubated at 37°C for 0, 60 and 150 seconds after ice-induced depolymerization (for 30 minutes). The graph represents the average of three independent experiments (calculating 10 cells per time point for each condition) (±S.E). Significant differences are noted as *p<0.05, Student's t-test(G) HeLa cells transfected with control or ALIX siRNA grown on coverslips were transiently transfected with pEYFP-C1 (green), pEYFP-MAP1S (green), pEGFP-C1 (green) or pEGFP-CLASP2α and immunostained with anti-α-tubulin (white), anti-Pericentrin (red) and Hoechst (blue). Scale bars, 5 μm(H) The lengths and numbers of astral MTs of HeLa cells treated as in (G) were measured (LSM software, version 3.2). The graphs show the average numbers (±S.E) based on calculating 30 control siRNA+YFP cells, 23 control siRNA+YFP-MAP1S cells, 30 ALIX siRNA+YFP cells, 30 ALIX siRNA+YFP-MAP1S cells, 28 control siRNA+GFP cells, 30 control siRNA+GFP-CLASP2α cells, 30 ALIX siRNA+GFP cells and 29 ALIX siRNA+GFP-CLASP2α cells from three separate experiments (*p<0.05, Student's t-test), respectively
Figure 1A: Immunoblot analysis of wild type (WT), FAM83D-/- knockout (KO) and FAM83DGFP/GFP knockin (KI) U2OS cell lines. Data information: All blots are representative of at least 3 independent experiments.D: AS or nocodazole-synchronised M KI cells were lysed and subjected to GFP TRAP immunoprecipitations (IP). Extracts (input) and IP samples were analysed by immunoblotting (IB) with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.E: KI cells synchronised in mitosis with either nocodazole (M Noc.) or STLC (M STLC) were collected by shake-off, and drug-treated cells that remained adherent after shake-off (AS Noc.; AS STLC) were lysed and subjected to GFP TRAP IP. AS cells and free-GFP-expressing 2G-PAI1 U2OS cells were included as controls. Input and IP samples were analysed by IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.F: Propidium iodide staining analyses revealing cell cycle distribution profiles for the samplesG, H: AS or nocodazole-synchronised (M) WT U2OS cells were subjected to IP with IgG and either anti-FAM83D-coupled sepharose beads (G), or anti-CK1α-coupled sepharose beads (H). Input and IP samples were analysed by IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.I: KI cells were synchronised in G2 with RO-3306, or arrested in mitosis (M) using STLC. STLC-treated shake-off cells were washed and re-plated, and cells lysed at the indicated time points after STLC wash-out. Cell lysates were subjected to GFP TRAP IP and input and IP extracts analysed by IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.J: Propidium iodide staining analyses revealing cell cycle distribution profiles for the samplesK: AS or STLC-synchronised (M) HeLa, A549 and HaCaT cells were subjected to IP with either IgG- or anti-FAM83D-coupled sepharose beads. Input and IP samples were analysed by IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.
Figure 2A: STLC-synchronised mitotic (M) wild-type (WT), FAM83D-/- knockout (KO) and FAM83DGFP/GFP knockin (KI) U2OS cells were subjected to anti-CK1α immunofluorescence and GFP fluorescence microscopy. DNA is stained with DAPI. Scale bars, 20 µm.B: STLC-synchronised mitotic (M) FAM83D-/- knockout (KO), FAM83DGFP/GFP knockin (KI) and FAM83DGFP/GFP(F283A) knockin (FA) U2OS cells were subjected to anti-CK1α immunofluorescence and GFP fluorescence microscopy. DNA is stained with DAPI. Scale bars, 20 µC: Quantification of CK1α spindle localisation for the cells Cell images denote the measured regions used to calculate the ratios on the box plot. Box plot whiskers denote the minimum and maximum measured values. The middle line represents the median, and the box ranges depict the 25th/75th percentiles. ***, P<0.0001; ANOVA. Analysis was performed on the indicated number of cells, n=2.D: The cell lines were STLC-synchronised and mitotic cells (M) isolated by shake off. Asynchronous (AS) cells were included as a control. Cells were lysed and subjected to GFP TRAP immunoprecipitation (IP) and subsequent immunoblotting (IB) with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.F: KI cells were infected with retroviruses encoding either VHL, aGFP.16, or VHL-aGFP.16. Uninfected cells were used as a control. Cells were lysed and subjected to IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.G: The cell lines were subjected to anti-CK1α immunofluorescence and GFP fluorescence microscopy. DNA is stained with DAPI. Scale bars, 20 µm.
Figure 3B: FAM83D-/- (KO), wild-type (WT), and two independent clones from a CRISPR/Cas9-mediated knockin rescue of FAM83D cDNA into FAM83D-/- cells (c. 6 and c. 11), were synchronized in mitosis (M) with STLC. Asynchronous (AS) cells were included as a control. Cells were lysed and subjected to immunoblotting (IB) with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.The cell lines were STLC-synchronized in mitosis, fixed, and stained with antibodies recognizing FAM83D (C) Representative images of mitotic cells are included. Scale bars, 20 µm.The cell lines were STLC-synchronized in mitosis, fixed, and stained with antibodies recognizing CK1⍺ (D). Representative images of mitotic cells are included. Scale bars, 20 µm.E: Quantification of CK1⍺ spindle localization Box plot whiskers denote the minimum and maximum measured values. The middle line represents the median, and the box ranges depict the 25th/75th percentiles. ***, P<0.0001; ANOVA. Analysis was performed on the indicated number of cells, n=1.F: The cell lines were STLC-synchronized in mitosis (M) or left AS, lysed and subjected to immunoprecipitation (IP) with anti-FAM83D-coupled sepharose beads, before IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.G: Asynchronous (AS) FAM83DGFP/GFP/ mCherry/mCherryCSNK1A1 knockin U2OS cells were fixed and imaged. Representative images from the indicated cell cycle stages are included. Scale bars, 10 µm.
Figure 4A: Nocodazole-synchronised mitotic FAM83DGFP/GFP knockin U2OS cells were lysed and subjected to GFP TRAP immunoprecipitation (IP), followed by incubation ± λ-phosphatase. Asynchronous (AS) cells were used as a control. Whole cell extracts (input) and IP samples were subjected to SDS-PAGE and subsequent immunoblotting (IB) with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.STLC-synchronised mitotic wild-type U2OS cells were lysed at the indicated time points following STLC washout and release into medium (B) AS cells were used as a control. Lysed extracts were subjected to IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.STLC-synchronised mitotic wild-type U2OS cells were lysed at the indicated time points following STLC washout and release into medium ± MG132 (C) AS cells were used as a control. Lysed extracts were subjected to IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.STLC-synchronised mitotic wild-type U2OS cells were lysed at the indicated time points following STLC washout and release into medium ± ProTAME (D). AS cells were used as a control. Lysed extracts were subjected to IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.E: Wild-type U2OS cells were either left asynchronous (AS), or arrested in mitosis with STLC and collected by shake-off (M). AS and M cells were incubated in media containing combinations of RO-3306 and MG132 as indicated, prior to lysis. MG132 was applied for 1.5 h, whereas RO-3306 was applied for the last 1 h of incubation prior to lysis. Samples were lysed and extracts were subjected to SDS-PAGE, before IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.F: STLC-synchronised mitotic wild-type U2OS cells were subjected to qRT-PCR analysis using primers for FAM83D, HMMR, CSNK1A1, and CCNB1. AS cells were used as a control. Error bars, SEM; *, P<0.01; Student's T-test. n=3H: STLC-synchronised mitotic wild-type (WT) and HMMR knockout (KO) mouse embryonic fibroblasts (MEFs) were lysed and subjected to IB with the indicated antibodies. AS cells were included as a control. Data information: All blots are representative of at least 3 independent experiments.The cells were STLC-synchronised in mitosis and subjected to immunofluorescence microscopy with an anti-HMMR antibody (I) DNA is stained with DAPI. Scale bars, 20 µm.The cells were STLC-synchronised in mitosis and subjected to immunofluorescence microscopy with an anti-CK1α antibody (J). DNA is stained with DAPI. Scale bars, 20 µm.
Figure 5B: STLC-synchronised mitotic FAM83DGFP/GFP knockin (KI), FAM83DGFP/GFP (F283A) (FA), and FAM83DGFP/GFP(F283A) stably expressing aGFP.16-CK1α (FA + aGFP.16-CK1α) U2OS cells were subjected to GFP TRAP immunoprecipitation (IP), followed by immunoblotting (IB) with the indicated antibodies. Asynchronous (AS) cells were used as controls. Data information: All blots are representative of at least 3 independent experiments.C: FA cells were infected with retroviruses encoding wild-type aGFP.16-CK1α (WT), or aGFP.16-CK1α with one of two distinct CK1α kinase-inactive mutants (D136N or K46D). Uninfected cells (-) were included as a control. Cells were lysed, subjected to anti-GFP IP and IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.D: Immunofluorescence analysis for the cells described in (B) following synchronisation with STLC. Cells were stained using anti-CK1α antibody, and DNA is stained with DAPI. Scale bars, 20 µm.F: FAM83D-/- knockout (KO), KI, and FA cells were synchronised in mitosis (M) using STLC. Lysed extracts were subjected to anti-GFP IPs, followed by ATP [γ-32P] kinase assays, using an optimised CK1 substrate peptide (CK1tide). AS cells were used as controls. Error bars, SEM; P<0.01; ANOVA. n=3. Input and IP samples were analysed by IB with the indicated antibodies. Data information: All blots are representative of at least 3 independent experiments.
Figure 6A. Representative images initiating at metaphase for mitotic U2OS cell lines stained with Hoechst, taken every 5 min as they progress through division. Mitotic stage was determined by chromosome condensation and is indicated by the coloured boxes. Scale bar, 20 μm.B. Graphical representation for the kinetics of transition from metaphase alignment (yellow) to anaphase (green), and cytokinesis (blue). 100 mitotic cells per genotype are plotted; n=2.C. Length of time needed to transition from metaphase to anaphase. Mean of 100 mitotic cells per genotype are plotted; n=2. Error bars, SEM. ***, P< 0.0001; ANOVA.D. Representative bright field images for mitotic U2OS cells indicating the long axis during interphase (white line) preceding mitosis, and the division axis determined at anaphase (yellow line). Scale bar, 20 μm.E. Percentage of oriented divisions for U2OS cells grown in subconfluent cultures. An oriented division axis was defined as being less than 30° removed from the long axis of the interphase cell. Mean of 50 cells per genotype are plotted, n=2. Error bars, SEM. ***, P< 0.0001; ANOVA.F. Representative images of mitotic U2OS cells stained with Hoechst and grown on L-shaped micropatterns previously coated with fibronectin. The position of metaphase chromosomes is indicated (yellow line) as is the presence of cortical blebbing (red arrows). Scale bar, 20 μm.G. Circular graphs, superimposed on L-shaped micropattern, show the distribution of cell division angles measured at anaphase. Angles for 100 U2OS cells are plotted per genotype, n=2. Metaphase position is indicated (yellow line) and the percentages of division angles ± 15° from the expected axis (red line) are indicated.H. Percentage of metaphase U2OS cells that align chromosomes outside of the expected axis (angles ± 15°). Mean of 100 cells per genotype are plotted, n=2. Error bars, SEM. ***, P< 0.0001; ANOVA.I. Representative images of RFP-actin localization in mitotic U2OS cells grown on fibronectin-coated, L-shaped micropatterns, which is superimposed. Arrowheads indicate polarized cortical actin. Heatmap shows the intensity of RFP-actin localization (Image J z-projection standard deviation) as the cell progresses from prophase to metaphase (12- 24 min). Scale bar, 20 μm.J. Heatmap additive intensities of RFP-actin localization in two representative mitotic U2OS cells for each genotype grown on fibronectin-coated, L-shaped micropatterns. Arrowheads indicate polarized cortical actin.
Figure 4B. Pull-down assay of Sec62 domain with different biotin-labeled Sec63 C-terminal peptides. Sec63-C2P denotes di-phosphorylated Sec63-C2.C. ITC-thermogram obtained from ITC after titration of Sec62 domain with increasing amounts of Sec63-C2P.F. Pull-down assay of the Sec62 domain and a mutant in the interaction interface (Sec62R51E) with biotin-labeled Sec63-C2P.
Figure 1E. The endouc and ela3l (negative control) mRNAs were separately microinjected into zebrafish embryos from huORFZ at a one-cell stage. Upper panels: observation of GFP signal expressed in huORFZ embryos at 72 hpf. Lower panels: magnification of pictures corresponding to the upper panels.
Figure 2C-E. Western blot analysis of proteins, as indicated, in (C) zebrafish embryos, (D) HEK 293T cells and (E) HeLa cells. GAPDH and α-tubulin served as internal controls. Protein levels relative to each internal control are presented below each lane.
Figure 3D. Zebrafish embryos at one-cell stage were microinjected with plasmids as indicated, followed by extraction of embryonic proteins at the 96-hpf stage. Protein levels of CHOP, p-eIF2α, total eIF2α, Endou-Flag, and its variants were detected using Western blot analysis. GAPDH served as an internal control. E. HEK 293T cells were transfected with indicated plasmids followed by analysis of the protein levels of CHOP, p-eIF2α, total eIF2α, Endou-Flag, and its variants using Western blot. The α-tubulin served as an internal control. Protein levels relative to each internal control are presented in each lane.
Figure 4D. Zebrafish embryos at one-cell stage were microinjected with plasmids as indicated followed by extraction of embryonic proteins at the 96-hpf stage. Protein levels of CHOP, p-eIF2α, total eIF2α, Endou-Flag, and its variants were detected using Western blot analysis. GAPDH served as an internal control. E. HEK 293T cells were transfected with indicated plasmids followed by analysis of the protein levels of CHOP, p-eIF2α, total eIF2α, Endou-Flag, and its variants using Western blot . Here, α-tubulin served as an internal control. Protein levels relative to each internal control were presented in each lane.
Figure 5B. HEK 293T cells were transfected with plasmids as indicated for 24 hr and treated with DMSO, thapsigargin (TH), ISRIB, or TH plus ISRIB for 2 hr followed by analysis of the protein level of CHOP, p-eIF2α, total eIF2α, Endou-Flag, and its variants using Western blot. The α-tubulin served as an internal control. Protein levels relative to each internal control were presented at each lane.D, E. MEF WT and mutant S51A cells were transfected with plasmids as indicated for 24 hr and treated with either DMSO or TH for 4 hr followed by analysis of the protein levels of CHOP, p-eIF2α, total eIF2α, GADD34, and Endouc-Flag using Western blot. GAPDH served as an internal control. Protein levels relative to each internal control were presented at each lane.
Figure 6A. MEF wild-type (WT) cells were transfected with plasmids as indicated for 24 hr and treated with either DMSO or Thapsigargin (TH) for 4 hr followed by analysis of the protein level of p-PKR, total PKR, and Endouc-Flag. GAPDH served as an internal control. Protein levels relative to each internal control were presented at each lane. The results obtained from the two trials are shown on the left and right.B. MEF WT cells were transfected with plasmids as indicated for 24 hr and treated with either DMSO or TH for 4 hr followed by analysis of the protein levels of p-eIF2α, total eIF2α, CHOP, and Endouc-Flag. GAPDH served as an internal control. Protein levels relative to each internal control were presented at each lane. The results obtained from the two trials are shown on the left and right.
Figure 7D, E. The cleavage activity of Endouc was studied using materials presented at each lane. EndoucK242A: Endouc mutant; Extract: incubated in cell extracts; and Buf: reaction buffer. RNA probe without adding reaction buffer served as a negative control. The predicted cleavage sites (U) were mutated to generate mutant huORFchop transcript (unlabelled huORF-mt) and labelled by biotin (biotin-huORF-mt). Unlabelled competitor RNA was added in reactions at five times higher than that of the biotinylated probe.
Figure 8A. HEK 293T cells were transfected with pCS2 vector (black), pCS2-Endouc (red), and pCS2-EndoucK242A (green) for 24 hr and subjected to either DMSO (control) or thapsigargin (TH; stress) treatment for 1 hr. The lysates of transfected cells were applied to polysome profile analysis (PPA). The sucrose gradient from top to bottom was shown from left to right, respectively. The sedimentation of 40S, 60S, 80S, and polysomes was indicated. Lysate from control, Endouc-expressing, and EndoucK242A-expressing cells were applied to PPA. The resulting fractions were TCA-precipitated, analysed by SDS-PAGE, and subjected to Western blot using antibodies against Flag and S6.