EMBO/soda-nel huggingface dataset:
NDP52 interacts with mitochondrial RNA poly(A) polymerase to promote mitophagy (2018)
Figure 4

Figure 4. Identification and analysis of SKICH domain-binding protein MTPAP.

(A, B) Anti-RFP immunoprecipitates from mCherry-NDP52 and mCherry-NDP52 ∆SKICH-transfected cells were subjected to SDS-PAGE followed by silver staining. Four bands specific for mCherry-NDP52 are numbered and were identified by mass spectrometric analysis. Asterisk (*) and double asterisk (**) indicate mCherry-NDP52 and mCherry-NDP52∆SKICH bands, respectively. The summary of mass spectrometric analysis is shown in (B).

(C) HeLa-GFP-Parkin cells expressing mCherry-NDP52 mutants were incubated with 1 µM valinomycin and 100 nM bafilomycin A1 for 3 h. Cell lysates were subjected to immunoprecipitation using anti-RFP magnetic beads. Immunoprecipitates were analyzed by western blotting.　Data are representative of three independent experiments.

(D) HeLa-GFP-Parkin cells transfected with siMTPAP were incubated with 1 µM valinomycin for the indicated times. Western blotting was performed using the indicated antibodies. Data are representative of three independent experiments.

(E) Mitophagic flux in cells transfected with siNDP52, siMTPAP and combinations of siRNAs. Cells were incubated with valinomycin for 3 h. Results are the summary of three independent experiments. Values are the means ± SEM. **p < 0.01 vs scrambled oligo-transfected cells; NS: not significant, determined with one-way ANOVA followed by the Tukey-Kramer post hoc test.

(F) Images of MTPAP KD cells expressing mCherry-NDP52 under valinomycin treatment. The images are from Movie EV 7. Cyan, GFP-Parkin; magenta, mCherry-NDP52. Images are representative of two independent experiments. Scale bars, 10 µm.
NDP52 interacts with mitochondrial RNA poly(A) polymerase to promote mitophagy (2018)
Figure 5

Figure 5. NDP52 irrupts into mitochondria and interacts with MTPAP.

(A) HeLa-GFP-Parkin cells were incubated with valinomycin for 0 or 2 h. Immunostaining was performed with anti-MTPAP and anti-Tom20 antibodies. Images are representative of two independent experiments. Scale bar, 10 µm.

(B) Mitochondrial-rich fraction prepared from HeLa-GFP-Parkin cells treated with or without valinomycin and epoxomicin for 2 h, was incubated with various concentrations of trypsin (0-1000 µg/ml) for 30 min on ice. Protease protection was analyzed by western blotting using antibodies for mitochondrial marker proteins (Tom20 for OMM, Tim23 for intermembrane space, UQCRC1 and TFAM for mitochondrial matrix). Data are representative of five independent experiments.

(C) HeLa-GFP-Parkin cells were incubated with 1 µM valinomycin and 100 nM bafilomycin A1 for 0-3 h in the presence or absence of 10 µM epoxomicin. Cell lysates were subjected to immunoprecipitation using anti-NDP52 antibody or control IgG. Immunoprecipitates were analyzed by western blotting. Data are representative of five independent experiments.

(D) Quantification of MTPAP co-immunoprecipitated with NDP52 in (C). Results are a summary of five independent experiments. Values are the means ± SEM. **p < 0.01 compared to cells treated with valinomycin and bafilomycin A1 for 3 h, determined with one-way ANOVA followed by the Tukey-Kramer post hoc test.

(E) HeLa-GFP-Parkin cells were incubated with 100 µM DFO and 100 nM bafilomycin A1 for 0, 4 and 8 h in the presence or absence of epoxomicin. Cell lysates were subjected to immunoprecipitation using anti-NDP52 antibody. Immunoprecipitates were analyzed by western blotting. Data are representative of two independent experiments.

(F) HeLa cells and HEK293T cells were incubated with 1 µM valinomycin and 100 nM bafilomycin A1 for 3 h or 100 µM DFO and 100 nM bafilomycin A1 for 8 h. Cell lysates were subjected to immunoprecipitation using anti-NDP52 antibody. Immunoprecipitates were analyzed by western blotting. Data are representative of two independent experiments.

(G) Immunoelectron micrographs of HeLa-GFP-Parkin cells expressing FLAG-NDP52. Cells treated for 2 h with valinomycin and bafilomycin A1 with or without epoxomicin, were processed for immune-electron microscopy with anti-FLAG antibody. Images are representative of ten cells. Arrow, immunogold labeled FLAG-NDP52. Mito, mitochondrion; MP, mitophagosome. Scale bars, 200 nm.

(H) Selected frames from time-lapse images of HeLa GFP-Parkin cells expressing mCherry-NDP52 under valinomycin and bafilomycin A1 treatment. The images are representative of two independent experiments and correspond to the boxed regions of Movie EV 6. Cyan, GFP-Parkin; magenta, mCherry-NDP52. The white arrowheads indicate colocalization of GFP-Parkin and mCherry-NDP52. The yellow arrowheads indicate mCherry-NDP existing inside GFP-Parkin ring structures. Scale bars, 1 µm.
NDP52 interacts with mitochondrial RNA poly(A) polymerase to promote mitophagy (2018)
Figure 6

Figure 6. MTPAP knockdown reduces the colocalization and the interaction between NDP52 and LC3.

(A, B) mCherry-LC3 and MTS-TagBFP were expressed in MTPAP KD and control cells. Cells were incubated with valinomycin for the indicated times and immunostained with anti-NDP52 antibody. Images are representative of two independent experiments. Yellow arrows indicate co-localization of MTS-TagBFP, mCherry-LC3 and NDP52. White arrows indicate co-localization of MTS-TagBFP and NDP52 (not mCherry-LC3). Scale bars, 10 µm. Co-localization of mCherry-LC3 and NDP52 on mitochondria is quantified in (B). At least ten cells from two independent experiments were quantified. Values are the means ± SEM. **p < 0.01 vs control, determined with one-way ANOVA followed by the Student's t test.

(C, D) MTPAP KD and control cells expressed mCherry-NDP52 or empty vector (C) or mCherry-LC3 (D). Lysates from cells treated with 1 µM valinomycin and 100 nM bafilomycin A1 for 2 h were subjected to immunoprecipitation using anti-RFP beads. Immunoprecipitates were analyzed by western blotting. Data are representative of three independent experiments.

(E) MTPAP KD and control cells were incubated with valinomycin and bafilomycin A1 for 2 h. Cell lysates were subjected to immunoprecipitation using an anti-NDP52 antibody or control IgG. Immunoprecipitates were analyzed by western blotting. Data are representative of three independent experiments.

(F) GST-NDP52 conjugated with glutathione-Sepharose resin was incubated with purified recombinant LC3 and MTPAP∆MTS∆C. The pulled down complex was subjected to western blotting. Data are representative of three independent experiments.
NDP52 interacts with mitochondrial RNA poly(A) polymerase to promote mitophagy (2018)
Figure 7

Figure 7. NDP52 irrupts into mitochondria in a ubiquitin-binding-independent manner.

(A) HeLa-GFP-Parkin cells expressing mCherry-NDP52 D439R/C443K mutant or WT NDP52 were incubated with valinomycin and nM bafilomycin A1 for 3 h. Cell lysates were subjected to immunoprecipitation using anti-RFP magnetic beads. Immunoprecipitates were analyzed by western blotting. Data are representative of two independent experiments.

(B) Selected frames from time-lapse images of HeLa GFP-Parkin cells expressing mCherry-NDP52 D439R/C443K mutant under valinomycin and bafilomycin A1 treatment. The images are representative of two independent experiments and correspond to the boxed regions of Movie EV 9. Cyan, GFP-Parkin; magenta, mCherry-NDP52 D439R/C443K. The white arrowheads indicate colocalization of GFP-Parkin and mCherry-NDP52. The yellow arrowheads indicate mCherry-NDP existing inside GFP-Parkin ring structures. Scale bars, 1 µm.

(C) Schematic model of damaged mitochondria recognition systems by autophagic membrane via NDP52-MTPAP interaction. On depolarized mitochondria, Parkin is activated and generates polyubiquitin chains on the OMM. The accumulation of polyubiquitin chains on the OMM induces the recruitment of mitophagy receptors and OMM rupture by proteasomes. NDP52 irrupts into mitochondria and interacts with MTPAP OMM rupture-dependently. The autophagic membrane recognizes damaged mitochondria by (i) poly-ubiquitin bound mitophagy rerceptors on the OMM (p62-like receptor mediated system), (ii) PHB2 on the IMM (Prohibitin-2 mediated system) and (iii) the NDP52-MTPAP complex (NDP52-MTPAP mediated system) via affinity with Atg8s (LC3 and GABARAP family).

Expanded View Figure Legends
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) Schematic diagram showing an alignment of the human VPS35 sequence (residues 610–680) with homologues from other well-studied eukaryotes. The D620N mutation is highlighted along with the H675R mutation that blocks binding to VPS29. The position of the D620N mutation of VPS35 is shown on the three-dimensional structure along with the H675R mutation and the V90 and I91 residues of VPS29 that mediate binding to VPS35 (PDB ID. 2R17). (b) Cells stably expressing WT or D620N GFP-VPS35 or otherwise transiently transfected with a panel of GFP-VPS35 constructs were lysed and the respective GFP-tagged protein recovered by immunoprecipitation (IP). (c) Untransfected HeLa cells or cells stably expressing VPS29-GFP, GFP-VPS35 wild-type or GFP-VPS35 D620N were lysed and the lysates incubated with anti-VPS26 to IP the retromer CSC. (d) Cells stably expressing the VPS29-GFP V90D mutant that cannot assemble with VPS35 were transiently transfected with mCherry-tagged WT VPS35, D620N and H675R constructs, along with an additional control of mCherry-FAM21 tail. Cells were lysed 48 h post transfection, and VPS29-GFP V90D and associated proteins were recovered by anti-GFP native IP. Blots shown are representative of experiments replicated at least twice.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) Cells expressing either WT GFP-VPS35 or the D620N mutant were treated with siRNA to abolish expression of endogenous VPS35. Each dish of cells was lysed in either HEPES lysis buffer (H) or PBS lysis buffer (P). Following centrifugation, equal portions of each lysate were combined to generate a mixed lysate (H/P). Each lysate was incubated with anti-GFP to recover the respective GFP-tagged VPS35 protein. (b) Similar to (a), but only cells expressing GFP-VPS35 wild type were analysed, either mock treated or treated with siRNA to silence FKBP15 expression. (c) Cells stably expressing WT or D620N GFP-VPS35 were treated with indicated siRNAs, lysed and immunoprecipitated as in (a).
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a,b) Cells expressing either WT or D620N GFP-VPS35 were treated with siRNA to silence expression of endogenous VPS35, fixed and labelled for GFP and FKBP15 (a) or FAM21 (b). Cells were imaged by fluorescence microscopy. Scale bar, 20 μm. (c) Cells stably expressing WT or D620N GFP-tagged VPS35 were treated with siRNA to abolish expression of endogenous VPS35 and subsequently fixed and labelled for GFP and either VPS26, FKBP15 or FAM21. The cells were imaged using Cellomics automated fluorescence microscopy. Approximately 250 cells per well in four wells were analysed for each cell line. The data for FKBP15 and FAM21 spot intensity were normalized to GFP-VPS35 and VPS26 signals. P0.0002 for both FKBP15 and FAM21 spot intensity in D620N compared with WT. Error bars indicate s.d. (d) Cells stably expressing either WT GFP-VPS35 or the D620N mutant were treated with siRNA to silence the expression of endogenous VPS35. Cells were permeabilized by flash freezing followed by rapid thawing and centrifuged to separate supernatant (S) and membrane pellet (P) fractions. (e) The graph shows the percentage of membrane-associated FKBP15 and strumpellin and is the mean of three experiments. The error bars indicate s.e.m. A representative blot of three experiments is shown, indicating the efficacy of the knockdown of endogenous VPS35 and also further showing that membrane proteins such as the CIMPR are detected only in the pellet fraction.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) HeLa cells stably expressing GFP-VPS35 WT and D620N were treated with bafilomycin A1 or DMSO vehicle control. Endogenous LC3-II and tubulin levels were examined by western blot. A representative experiment of six experiments is shown. (b) Quantification of the representative experiment in triplicate shown in a, in which endogenous LC3-II levels are normalized to tubulin and expressed as a ratio of levels in WT. ***P=7.86 × 10−6 (DMSO) and 3.81 × 10−5 (Baf) by 2-tailed Student’s t-test. (c) HeLa cells stably expressing GFP-VPS35 WT and D620N were transfected with mRFP-LC3. The number of LC3 vesicles was quantified by Cellomics automated fluorescence microscopy. A representative experiment of three independent experiments is shown, with 344 (WT) and 401 (D620N) cells analysed. ***P0.0001 by 2-tailed Student’s t-test. (d) GFP-VPS35 WT and D620N-expressing cells were transfected with HA-Q74 and immunostained for HA. The percentage of transfected cells with aggregates was counted by a blinded experimenter. The quantification shows the mean of three experiments in triplicate with minimum 200 cells per replicate. ***P=0.00086 by 1-tailed Student’s t-test. (e) Confocal images representative of the experiment described in d. Scale bar, 20 μm. (f) Cells stably expressing WT and D620N GFP-VPS35 were transfected with GFP-α-synuclein A53T and GFP for 48 h and analyzed by western blotting. (g) Quantification of the representative experiment in triplicate in f, in which the level of α-synuclein was expressed as a ratio to GFP. A representative experiment of two independent experiments is shown. **P=0.0047 by 2-tailed Student’s t-test. (h) VPS35 was knocked down with two individual siRNA nucleotides in HeLa cells, and cells were treated with bafilomycin A1 and lysed as in a. A representative experiment is shown in triplicate. (i) Quantification of three independent experiments in triplicate. *P=0.026; other results non-significant by 2-tailed Student’s t-test. (j) Protein levels of CSC, including VPS35, VPS26 and VPS29), were assessed upon VPS35 knockdown, confirming previous results that knockdown of one component destabilizes the CSC. All error bars indicate s.e.m.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) HeLa cells were transfected with pEGFP vector or GFP-FAM21 tail for 48 h and subsequently treated with bafilomycin A1 as in Fig. 4. Endogenous LC3-II and tubulin levels were assessed by western blot. (b) Quantification of the representative experiment in triplicate shown in a, of two independent experiments. *P=0.02 (DMSO) and 0.08 (Baf) by 2-tailed Student’s t-test. (c) HeLa cells stably expressing GFP-VPS35 WT and D620N were transfected with pEGFP vector or GFP-FAM21, and subsequently treated with bafilomycin A1, lysed and subjected to western blot as in a. (d) Quantification of the representative experiment in triplicate shown in c, of two independent experiments. **P=0.008 by 2-tailed Student’s t-test. (e) Cells were depleted of WASH1, treated with bafilomycin A1 and examined for endogenous LC3-II, tubulin, WASH1 and GAPDH levels. A representative experiment of six independent experiments is shown. (f) Quantification of the representative experiment shown in e. **P=0.002 (DMSO) and P=0.0028 (Baf) by 2-tailed Student’s t-test. (g) HeLa cells depleted of WASH1 by siRNA were transfected with GFP-LC3 for 24 h. The number of LC3 vesicles was quantified by Cellomics automated fluorescence microscopy. A representative experiment of two independent experiments is shown, with 757 (control) and 695 (knockdown) cells analysed. ***P0.0001 by 2-tailed Student’s t-test. (h) HeLa cells depleted of FKBP15 were transfected with GFP-LC3 and vesicles were quantified as in g. A representative experiment of two independent experiments in triplicate is shown, with 579 (control) and 815 (knockdown) cells analysed in total. (i) HeLa cells depleted of FKBP15 were subsequently transfected with a GFP-Q74 construct for 24 h and fixed in PFA. The percentage of transfected cells with aggregates was counted by a blinded experimenter. The quantification shows the mean of two experiments, each in triplicate with min 220 cells counted per replicate. (j) FKBP15 was depleted in HeLa cells as in e. A representative blot from three independent experiments in triplicate is shown. Error bars indicate s.e.m.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) HeLa cells were immunostained for endogenous ATG9A and VPS35 and subjected to confocal microscopy. Magnified areas are shown on the right of the pictures. (b) HeLa cells were transfected with ATG9A-GFP for 24 h, and subsequently fixed, immunostained for endogenous WASH1 and subjected to confocal microscopy. (c) HeLa cells were transfected with ATG9A-GFP as in b, but immunostained instead for endogenous FAM21. (d) HeLa cells stably expressing GFP-VPS35 WT and D620N were depleted of endogenous VPS35 using 40 nM of siRNA, and subsequently immunostained for TGN46 and endogenous ATG9A and subjected to confocal microscopy. (e) Colocalization between TGN and ATG9A is expressed in terms of the Pearson’s Coefficient. n=25 cells (WT) and 33 cells (D620N). Error bars represent s.e.m. and **P=0.01 by 2-tailed Student’s t-test. Scale bars in (a–d), 10 μm.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) HeLa cells depleted of WASH1 with two successive siRNA treatments were either starved in Hank’s balanced salt solution for 1 h or kept in full medium. Following fixation, cells were immunostained for TGN46, ATG9A and VPS35 and subjected to confocal microscopy. Representative pictures with magnified areas are shown. Scale bar, 10 μm. (b) Colocalization between TGN and ATG9A is expressed in terms of the Pearson’s coefficient. Number of cells analysed: 38 (control basal), 46 (knockdown basal), 36 (control starved), 53 (knockdown starved). Error bars represent s.e.m. and ***P=0.0005 (basal) and P=0.0004 (starved) by 2-tailed Student’s t-test.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) HeLa cells stably expressing GFP-VPS35 WT and D620N were transfected with mRFP-LC3 for 24 h, immunostained for endogenous ATG9A, and imaged by confocal microscopy. (b) Colocalization is expressed in terms of Mander’s coefficient M1 to indicate the proportion of LC3 intensities that also contain ATG9A intensities. A representative experiment of three independent experiments is shown, in which at least 33 cells were analysed per condition. Error bars indicate s.e.m., and ***P0.001 by 2-tailed Student’s t-test. (c) HeLa cells depleted of WASH1 were transfected with GFP-LC3 for 24 h, immunostained for endogenous ATG9A, and imaged by confocal microscopy. (d) Colocalization expressed as M1, as in b. A representative experiment of two independent experiments is shown, in which at least 24 cells were analysed per condition. Error bars indicate s.e.m., and ***P0.001 by 2-tailed Student’s t-test. Scale bars in (a,c), 10 μm. In b,d, colocalization was measured for the entire area of the cell slice in each image. In order to ensure that results were not confounded by diffuse nuclear staining often observed in the LC3 channel, the analyses were repeated with the nuclei excluded, and all of the results remained statistically significant.
Mutation in VPS35 associated with Parkinson’s disease impairs WASH complex association and inhibits autophagy (2014)
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(a) SH-SY5Y cells were depleted of WASH1, treated with bafilomycin A1 and examined for LC3-II, tubulin, WASH1 and GAPDH levels. Blots shown are representative of two independent experiments in triplicate. (b) Quantification of the representative experiment in triplicate shown in (a), of two independent experiments. Error bars indicate s.e.m. **P=0.0058 by 1-tailed Student’s t-test. (c) WASH1-depleted SH-SY5Y cells were trypsinized, stained with propidium iodide and analysed by flow cytometry. Living cells, not stained with propidium iodide, are shown as a percentage of total cells. The graph depicts a representative experiment in triplicate out of two independent experiments, in which at least 10,000 cells were analysed in each replicate. Error bars indicate s.e.m. *P=0.045 by 1-tailed Student’s t-test.
Identification of a novel PPARβ/δ / miR-21-3p axis in UV-induced skin inflammation (2016)
Figure 1

Figure 1: PPAR/ activates the expression of UV-induced epidermal miR-21-3p.

(A) RT-qPCR quantification of relative miR-21-3p and miR-21-5p levels in mouse brain, heart, kidney and epidermis. N=4 animals per group, one representative experiment is shown out of three independent replicates. (B) Fluorescent miR-21-3p in situ hybridization (pink) in dorsal skin of acutely irradiated (Ac-UV) and non-irradiated (no UV) Ppard +/+ and -/- mice. E: epidermis; D: dermis; HF: hair follicle. Magnification bar: 100m (C) RT-qPCR quantification of relative pri-miR-21 and miR-21-3p levels in the epidermis (left and middle), and of relative miR-21-3p in the dermis (right) of acutely irradiated (Ac-UV; +) and non-irradiated (-) Ppard +/+ and -/- mice. Pri-miR-21: Ppard +/+ Ac-UV vs Ppard -/- Ac-UV P = 0.022; miR-21-3p: Ppard +/+ no UV vs Ppard +/+ Ac-UV P = 0.017, Ppard +/+ Ac-UV vs Ppard -/- Ac-UV P = 0.008. N=3-4 animals per group, one representative experiment is shown out of three independent replicates. (D) RT-qPCR quantification of relative miR-21-3p levels in total skin of chronically irradiated (Chr-UV; +) and non-irradiated (-) Ppard +/+ and -/- mice. miR-21-3p: Ppard +/+ no UV vs Ppard +/+ Chr-UV P = 0.008, Ppard +/+ Chr-UV vs Ppard -/- Chr-UV P = 0.002, ns: non significant. N=4 animals per groups, one representative experiment is shown out of two independent replicates. (E) RT-qPCR quantification of relative miR-21-3p level in the epidermis of Ppard +/+ and -/-mice, acutely irradiated (Ac-UV; +) or non-irradiated (-), treated with the PPAR/ antagonist GSK0660 (+) or vehicle (-), as indicated. miR-21-3p: Ppard +/+ no UV vs Ppard +/+ Ac-UV P = 0.005, Ppard +/+ Ac-UV vs Ppard +/+ Ac-UV/GSK0660 P = 0.04, N=5 (Ppard +/+) to 3 (Ppard -/-) animals per group. One representative experiment is shown out of two independent replicates (F) RT-qPCR quantification of relative miR-21-3p levels in HaCat cells treated with the PPAR/ agonists GW501516, GW0742 (+) or vehicle (-) as indicated. miR-21-3p: Veh vs GW501516 P = 4E-04, Veh vs GW0742 P = 2E-04. N=2-3 biological replicates, one representative experiment is shown out of two independent replicates.