EMBO/soda-nel huggingface dataset:
Impaired GAPDH-induced mitophagy contributes to the pathology of Huntington's disease. (2015)
Figure 3

Expanded polyglutamine repeats affect elimination of damaged mitochondria by mitophagy

A Representative Western blots showing separation of lysosome- and mitochondria-enriched fractions by a density gradient. Total extracts from different HD models were fractionated by the density gradient. Eight fractions were collected from top (#1) to the bottom (#8). The amount of mitochondria in the lysosomal fractions was presented as a percentage of VDAC present in the entire gradient. n = 3.

B, C Representative electron micrographs of PC12 cells expressing Q23 or Q74 and brain tissues from wild-type (WT) and HD transgenic R6/2 mice showing mitochondrial (as indicated by yellow arrows) association with lysosomal vacuoles (shown by red arrows). The vacuoles containing mitochondrial remnants are presented as a percentage of the total vacuoles counted. Analysis (of six independent images) was carried out by an observer blinded to the experimental conditions. *P < 0.023; **P < 0.035. Scale bar: 1 μm.

D Western blot showing association of mitochondrial membrane with lysosomal membrane. The presence of membranes of each organelle was assessed using anti-MFN1, VDAC (as mitochondria markers), and LAMP1 (as a lysosomal marker). n = 3.

E Representative Western blot showing mitochondrial contents (VDAC, Tom20, and aconitase) in the total lysates of PC12 cells with Q23 or Q74. Mitochondrial protein levels were normalized to beta-actin. n = 3. *P = 0.024; **P = 0.0008; ***P = 0.03.

F Representative Western blot showing mitochondrial contents (VDAC, Tom20, and aconitase) in the total lysates of normal fibroblast cells and HD patient-derived fibroblasts. Mitochondrial protein levels were normalized to the cytosolic protein, enolase. n = 3. *P = 0.008; **P = 0.002; #P = 0.0008.

G Representative Western blot showing mitochondrial contents (VDAC, Tom20, and aconitase) in the total lysates of mice striatal cells with Q7 and Q111. n = 3. *P = 0.0008; **P = 0.0007; #P = 0.001.

H Western blot showing mitochondrial contents (Tom20 and aconitase) in the total lysates of brain tissues from wild-type (WT) and HD transgenic mice. n = 2. *P = 0.02; **P = 0.03 *§P = 0.01; **§P < 0.04.

Data information: The data are presented as mean ± SEM. Statistical significance was assessed by Student’s t-test.

Source data are available online for this figure.
Impaired GAPDH-induced mitophagy contributes to the pathology of Huntington's disease. (2015)
Figure 4

Expanded polyglutamine repeats selectively associate with mitochondrial GAPDH, inhibiting GAPDH-induced mitophagy

Western blots showing co-immunoprecipitation of GAPDH from the total lysates and isolated mitochondria of PC12 cells with anti-GAPDH antibody. Anti-EGFP antibody detects the presence of polyglutamine repeats. Bottom panel shows co-immunoprecipitation of GAPDH in the total lysate of PC12 cells treated with formaldehyde to cross-link proteins. Ctr* = control. n = 3.

Western blots showing co-immunoprecipitation of GAPDH from the total lysate (left) and isolated mitochondria (right) of brain tissues of wild-type (WT) and transgenic R6/2 (HD) mice with anti-GAPDH antibody. The presence of huntingtin was examined with anti-huntingtin antibody and anti-polyglutamine antibody, respectively. Co-immunoprecipitated huntingtin or polyglutamine (polyQ) was normalized to GAPDH. Left: n = 2. *P = 0.03; **P = 0.02. Right: One representative experiment from two repeats.

Sub-mitochondrial localization of GAPDH and expanded polyglutamine repeats. Isolated mitochondria were left untreated or subjected to the proteinase K treatment in the presence or absence of detergent (Triton X-100). n = 3.

Illustration describing association of oxidized GAPDH (represented by green circles) and expanded polyglutamine repeats (in mutant huntingtin protein (MtHtt) represented by purple circles) at the outer membrane of damaged mitochondria.

Data information: The data are presented as mean ± SEM. Statistical significance was assessed by Student’s t-test.

Source data are available online for this figure.
Impaired GAPDH-induced mitophagy contributes to the pathology of Huntington's disease. (2015)
Figure 5

Overexpression of inactive GAPDH rescues polyglutamine-induced blunted mitophagy and recovers mitochondrial function

Representative Western blot showing levels of mitochondrial proteins, as indicated by the presence of aconitase, VDAC, and Tom20, in the total lysates of PC12 cells with Q23 or Q74 before (represented as NT: no treatment) and after overexpression of inactive GAPDH (represented as G). n = 3. *P < 0.035; **P = 0.001; #P = 0.001.

Representative Western blot showing levels of mitochondrial proteins in the total lysates of mice striatal cells with Q7 or Q111 before (NT) and after overexpression of inactive GAPDH (G). n = 2. *P = 0.006; **P = 0.007; #P = 0.001.

Determination of mitochondrial ROS production in different HD models. Results are shown as percent of control. n = 3. *P = 0.008; #P = 0.054; **P = 0.03.

Determination of mitochondrial membrane potential using JC-1 in different HD models and control cells (MMP, ΔΨm). The difference in membrane potential between NT (no inactive GAPDH overexpression) and G (inactive GAPDH overexpression) in cells with expanded polyglutamine repeats (PC12 cells with Q74 and HD patient-derived fibroblasts) was not statistically significant. n = 3.

ATP levels in normal and HD patient-derived fibroblasts. The difference in ATP levels between NT (no inactive GAPDH overexpression) and G (inactive GAPDH overexpression) in HD patient-derived fibroblasts was not statistically significant. n = 2.

Cell viability determined by colorimetric assays in different HD models and control cells. n = 3. *P = 0.02; **P = 0.02; ##P = 0.01.

Immunofluorescence of normal and HD patient-derived fibroblasts, with and without overexpression of inactive GAPDH, stained for late endosome with anti-Rab7 antibody and mitochondria with anti-Tom20 antibody. Images were acquired at 63× magnification, and brightness and contrast of all images were adjusted by 30%. Correlation coefficient (juvenile): **P = 0.007; *#P = 0.005. Mitochondrial interconnectivity (juvenile): ##P = 0.001; ##*P = 0.02. Correlation coefficient (adult): §§P = 0.001; *§P = 0.005. Mitochondrial interconnectivity (adult): ≠≠P = 0.043; ≠≠*P = 0.015.

Data information: The data are presented as mean ± SEM. Statistical significance was assessed by Student’s t-test.

Source data are available online for this figure.
Impaired GAPDH-induced mitophagy contributes to the pathology of Huntington's disease. (2015)
Figure 6

In vitro reconstitution of mitophagy using recombinant inactive GAPDH promotes clearance of damaged mitochondria, independently of autophagy

Representative Western blot showing levels of mitochondrial proteins, as indicated by the presence of aconitase, VDAC, and Tom20, in the total lysates of PC12 cells with Q23 or Q74 in an in vitro reconstituted micro-mitophagic system. NT: no inactive GAPDH treatment; G: inactive GAPDH treatment. n = 3. *P = 0.0007; **P = 0.001; #P = 0.008.

Representative Western blots showing levels of mitochondrial proteins (aconitase and Tom20) in the total lysates of fibroblast cells (juvenile and adult) and mice striatal cells with Q7 or Q111 in an in vitro reconstituted mitophagic system. n = 2. §P = 0.01; §§P = 0.02; *P = 0.04; **P = 0.02; #P = 0.001; ##P = 0.024.

Representative Western blot showing levels of mitochondrial proteins (aconitase and Tom20) in the total lysates of PC12 cells. The cells were treated with 1 mM of 3-methyladenine (3MA) for 5 h prior to the micro-mitophagy reconstitution assay. n = 2. *P = 0.001; **P = 0.01; *#P = 0.003; **#P = 0.01; #P = 0.02; §P = 0.049; #§P = 0.004; ##§P = 0.007.

Western blot showing the level of Atg5 expression in the Atg5+/+ (WT) and Atg5−/− (KO) MEF cells.

Western blot showing levels of GAPDH association with mitochondria in Atg5 KO MEF cells. n = 2. *P = 0.04.

Western blot showing relative mitochondrial mass in the total lysates of Atg5 KO MEF cells. n = 2. **P = 0.03; ***P = 0.02. Expression levels of Q23 or Q73 were detected with anti-His antibody.

Western blot showing relative mitochondrial mass in the total lysates of Atg5 KO MEF cells without and with recombinant inactive GAPDH treatment (represented as NT and G, respectively). n = 2. *P = 0.02; **P = 0.03; *#P = 0.03; #P = 0.005.

Data information: The data are presented as mean ± SEM. Statistical significance was assessed by Student’s t-test.

Source data are available online for this figure.
A new model for the HPA axis explains dysregulation of stress hormones on the timescale of weeks (2020)
Figure 1

Figure 1. After prolonged stress, ACTH response is blunted for weeks after cortisol response normalizes.

(A) Schema of the classic HPA axis. CRH causes the secretion of ACTH and cortisol.

(B) In the CRH test, the secretion of these hormones is measured after CRH administration.

(C) Patients suffering from major depressive disorder (MDD) show a blunted ACTH response to CRH (black line, N=10), compared with control (gray line, N=10) - data from (von Bardeleben et al, 1988), shown are mean ± SEM.

(D) Patients suffering from anorexia and admitted to treatment show a blunted ACTH response and hypercortisolemia, which resolves within 6-24 months after weight normalization- data from (Gold et al, 1986a). However, 3-4 weeks after weight normalization, cortisol dynamics are normal whereas ACTH dynamics are blunted. Pregnancy is associated with elevated cortisol levels due to CRH secretion by the placenta. 3 weeks after delivery, cortisol levels and dynamics return to normal, whereas ACTH dynamics are blunted- data from (Magiakou et al, 1996). After 12 weeks, ACTH dynamics normalize as well, while cortisol dynamics remain normal. Individuals recovering from alcohol abuse show hypercortisolemia and blunted ACTH response after admission - data from (von Bardeleben et al, 1989). After 2-6 weeks, these individuals show normal cortisol dynamics, but blunted ACTH responses persist. In all panels, control patient data are denoted by thin gray line (Anorexia: N=13. Pregnancy: N was unspecified. Alcohol abuse disorder: N=11), and case data by a thicker black line (Anorexia: left panel, N=9, center panel, N=5, right panel, N=6. Pregnancy: N=17. Alcohol abuse disorder: N=20). Shown are mean ± SEM for all panels.
Imperfect interface of Beclin1 coiled-coil domain regulates homodimer and heterodimer formation with Atg14L and UVRAG (2012)
f2

(b) The CD spectra of the Beclin 1 CC domain at different temperatures. (c). Dynamic exchange assay of wild-type Beclin 1. His-tagged and untagged Beclin 1 CC domain were co-incubated at the indicated temperatures and coprecipitated at preset temperatures by Ni2+– nitrilotriacetic acid (NTA) agarose beads. The presence of heterodimeric Beclin 1 CC domain, consisting of one monomer with his-tag and the other monomer without tag, was checked by SDS gel and indicated by the arrow. (d) Self-association pattern of Beclin 1 in vivo. Both GFP- and AsRed-tagged full-length Beclin 1 are co-transfected into HEK 293T cells and their self-association is probed by co-IP using GFP antibody for immunoprecipitation, followed by western blot with anti-AsRed antibody.
Imperfect interface of Beclin1 coiled-coil domain regulates homodimer and heterodimer formation with Atg14L and UVRAG (2012)
f3

(a, b) ITC titration profile of Beclin 1 CC domain with Atg14L (a) or UVRAG (b). (c) Pull-down assay to assess the competition between Beclin 1–Atg14L and Beclin 1–UVRAG complexes. Increasing amount of His6-tagged Beclin 1 CC domain was added to a mixture of Atg14L and UVRAG proteins corresponding to their respective CC region. The Beclin 1–Atg14L/UVRAG complexes were pulled down by Ni2+– nitrilotriacetic acid (NTA) agarose beads and checked by SDS gel. (d) Co-IP experiments to assess the competition between Beclin 1–Atg14L and Beclin 1–UVRAG complexes in vivo. FLAG- or GFP-tagged Atg14L or UVRAG was transfected alone, or both were co-transfected into HEK 293T cells and their interaction with endogenous Beclin 1 was probed by co-IP using GFP antibody, followed by western blot with anti-Beclin 1 antibody.
Imperfect interface of Beclin1 coiled-coil domain regulates homodimer and heterodimer formation with Atg14L and UVRAG (2012)
f4

(a) The scheme for designing monomeric (MutM) or stabilized (MutStab) mutants of the Beclin 1 CC domain. Wild-type CC domain dimer is represented in the centre as two antiparallel colour bars. Each individually coloured segment on the two bars represents a single heptad repeat. The colour gradient is from blue at N-terminal to red at C-terminal. Two grey spheres are drawn for each coloured segment, indicating the a and d residues that form the dimer interface. The canonical a-d' pairings mutated in MutM constructs are coloured yellow and the imperfect a-d' pairings mutated in MutStab constructs are coloured red for charged residues or green for alanine residues. (b) The estimated molecular weight of Beclin 1 CC domain wild-type, MutM and MutStab constructs based on their respective sedimentation equilibrium profile (Supplementary Fig. S10). (c) Self-association pattern of wild-type, MutM and MutStab constructs of Beclin 1 in vivo. For each construct, both GFP- and Myc-tagged full-length Beclin 1 are co-transfected into HEK 293T cells and their self-association is probed by co-IP using GFP antibody for IP, followed by western blot with anti-Myc antibody. (d). Temperature-dependent CD profile of Beclin 1 CC domain wild-type and MutStab constructs at 220 nm.
Imperfect interface of Beclin1 coiled-coil domain regulates homodimer and heterodimer formation with Atg14L and UVRAG (2012)
f5

(a,b) Interaction of Beclin 1 wild-type and monomeric (MutM) mutants with Atg14L or UVRAG in cultured cells. HEK 293T cells were transfected with GFP-tagged Beclin 1 variant alone (a) or together with FLAG-UVRAG (b). The lysates were immunoprecipitated by GFP antibody, followed by western-blot analysis with anti-Atg14L antibody for detecting binding to endogenous Atg14L (a) or with anti-UVRAG antibody for detecting binding to the FLAG-tagged UVRAG protein (b).
Imperfect interface of Beclin1 coiled-coil domain regulates homodimer and heterodimer formation with Atg14L and UVRAG (2012)
f6

(a, b) Interaction of MutStab mutants of Beclin 1 with Atg14L or UVRAG in vivo. HEK 293T cells were transfected with GFP-tagged Beclin 1 variant alone (b) or together with FLAG-UVRAG (b). The lysates were immunoprecipitated by GFP antibody, followed by western blot analysis with anti-Atg14L antibody for detecting binding to endogenous Atg14L (a) or with anti-UVRAG antibody for detecting binding to the FLAG-tagged UVRAG protein (b).
Imperfect interface of Beclin1 coiled-coil domain regulates homodimer and heterodimer formation with Atg14L and UVRAG (2012)
f7

(a,b). Representative fluorescent images of HeLa cells co-tansfected with GFP-tagged Beclin 1 wild type, MutM L178A/L192A or MutStab E189L/A217L/E224L/A255L (green) and AsRed–Atg14L (red) (a) or FLAG-UVRAG (red) (b); Co-localization of AsRed–Atg14L with GFP-tagged Beclin 1 wild type or MutM is shown in discrete puncta. (c–e) Representative fluorescence images of HeLa cells co-transfected with Myc-Beclin 1 wild type, MutM L178A/L192A or MutStab E189L/A217L/E224L/A255L (blue), AsRed–Atg14L (red) and GFP-tagged Atg12 (c), LC3 (d) and DFCP (e) (green). The scale bar is 20 μM. (f). A proposed model for the dynamic transition among homodimer (antiparallel) of Beclin 1, and the heterodimers of Beclin 1–Atg14L and Beclin 1–UVRAG. Multiple homo- and hetero-oligomeric forms of Beclin 1 protein exist intracellularly, and the nature of metastability in Beclin 1 CCD interface facilitates the transition of Beclin 1 homodimer to Beclin 1–Atg14L/UVRAG heterodimer that are compatible with activated autophagy-lysosomal degradation. The star shapes indicate the imperfect dimer interface. The thicker arrows pointing towards Beclin 1–UVRAG complex indicate its stronger affinity.
RBPJ/CBF1 interacts with L3MBTL3/MBT1 to promote repression of Notch signaling via histone demethylase KDM1A/LSD1 (2017)
Figure 1

Figure 1. RBPJ interacts with L3MBTL3.

A Detection of the RBPJ/L3MBTL3 interaction using the yeast two-hybrid (Y2H) assay. In this Y2H experiment, RBPJ is fused to the GAL4 DNA-binding (DB) domain and L3MBTL3 is fused to the GAL4 activation domain (AD). The DB-RBPJ and AD-L3MBTL3 fusion proteins interact with each other, leading to the activation of the ADE2 and HIS3 reporter genes and allowing yeast cells to grow on selective media lacking adenine or histidine. The six Y2H controls were previously described (Dreze et al, 2010). The experiment was independently replicated thrice.

B Endogenous L3MBTL3 co-purifies specifically with HA-RBPJ but not with HA-EGFP, HA-TBL1X or HA-HEY2. Immuno-precipitation (IP) of HA-tagged RBPJ, EGFP, TBL1X or HEY2 in U87-MG cells followed by Western blot analyses using HA or L3MBTL3 antibody. The experiment was independently replicated twice.

C Endogenous RBPJ co-purifies specifically with HA-L3MBTL3 but not with HA-EGFP, HA-TBL1X or HA-HEY2. IPs of HA-tagged L3MBTL3, EGFP, TBL1X or HEY2 in U87-MG cells followed by Western blot analyses using HA or RBPJ antibody. The experiment was independently replicated twice.

EV: Empty Vector control; WB: Western blot; IP: immuno-precipitation.
RBPJ/CBF1 interacts with L3MBTL3/MBT1 to promote repression of Notch signaling via histone demethylase KDM1A/LSD1 (2017)
Figure 2

Figure 2. Mapping of the RBPJ/L3MBTL3 interaction.

A Schematic representation of the L3MBTL3 protein and the deletion mutants used in panel B. The L3MBTL3 protein (XP_006715641.1) consists of a C2C2 zinc finger (ZnF #1; CDD: 128717), three MBT domains (CDD: 214723), a C2H2 zinc finger (ZnF #2; CDD: 201844) and a sterile α motif domain (SAM; CDD: 197735).

B L3MBTL3-Δ(1-64) does not interact with RBPJ. IP of HA-FLAG-tagged RBPJ in the presence of FLAG-tagged L3MBTL3 (WT or deletion mutants) in HEK293T cells followed by Western blotting using FLAG antibody. The experiment was independently replicated twice.

C Schematic representation of the RBPJ protein and the deletion mutants used in panels D and E. The RBPJ protein (XP_005248218.1) consists of the N-terminal domain (NTD), the β-trefoil domain (BTD) and the C-terminal domain (CTD).

D Deletion of the BTD domain impairs the RBPJ/L3MBTL3 interaction. IP of HA-tagged L3MBTL3 in the presence of FLAG-tagged RBPJ (WT and deletion mutants) in HEK293T cells followed by Western blotting using HA or FLAG antibody. The experiment was independently replicated twice.

E RBPJF261R point mutant does not interact with L3MBTL3. IP of HA-tagged L3MBTL3 in the presence of FLAG-tagged RBPJ (WT and point mutants) in HEK293T cells followed by Western blotting using HA or FLAG antibody. RBPJV263R and RBPJA284R also show a reduced ability to interact with L3MBTL3. The experiment was independently replicated twice.

WB: Western blot; IP: immuno-precipitation.
RBPJ/CBF1 interacts with L3MBTL3/MBT1 to promote repression of Notch signaling via histone demethylase KDM1A/LSD1 (2017)
Figure 3

Figure 3. NOTCH1 ICD and L3MBTL3 compete for binding to RBPJ.

A Thermodynamic characterization of the RBPJ/L3MBTL3 interaction. Representative thermograms (raw heat signal and nonlinear least squares fit to the integrated data) for L3MBTL3-(31-70) binding to RBPJ-(53-474).

B/C NOTCH1 ICD outcompetes L3MBTL3 for binding to RBPJ in a dose-dependent manner. IPs were performed in CRISPR/Cas9-mediated L3MBTL3 knockout (KO) HEK293T cells. (B) SBP-FLAG-RBPJ and HA-L3MBTL3-Δ(SAM) in the presence of an increasing amount of HA-NOTCH1 ICD. (C) SBP-FLAG-RBPJ and HA-NOTCH1 ICD in the presence of an increasing amount of HA-L3MBTL3-Δ(SAM). The L3MBTL3-Δ(SAM) mutant construct was used instead of the L3MBTL3 WT construct in order to allow the analysis of both NOTCH1 ICD and L3MBTL3 proteins in the same Western blot. CRISPR/Cas9 sg-L3MBTL3-resistant plasmids were used to express HA-L3MBTL3-Δ(SAM). The experiment was independently replicated thrice. WB: Western blot; IP: immuno-precipitation.
RBPJ/CBF1 interacts with L3MBTL3/MBT1 to promote repression of Notch signaling via histone demethylase KDM1A/LSD1 (2017)
Figure 4

Figure 4. RBPJ recruits L3MBTL3 on chromatin to repress the expression of Notch target genes in U87-MG cells.

A De-repression of Notch target genes upon RBPJ knockdown. Shown are means ±s.d. of quadruplicate experiments. [*] P<0.05, [**] P<0.01, NS: Not Significant; one-way ANOVA model on log-transformed data. Inset: Western blot analysis validates the shRNA-mediated depletion of RBPJ.

B De-repression of Notch target genes in L3MBTL3 KO U87-MG cells. Shown are means ±s.d. of quadruplicate experiments. [**] P<0.01, NS: Not Significant; two-sample T-test on log-transformed data. Inset: Western blot analysis validates the CRISPR/Cas9-mediated KO of L3MBTL3.

C RBPJ and L3MBTL3 co-localize at the proximal Notch-responsive elements of Notch target genes. Shown are means ±s.d. of triplicate ChIP experiments.

D L3MBTL3 occupancy at the proximal Notch-responsive elements of Notch target genes decreases upon RBPJ knockdown. Shown are means ±s.d. of triplicate ChIP experiments.

E The repressive activity of L3MBTL3 at Notch target genes is RBPJ-dependent. Expression analysis of Notch target genes upon RBPJ knockdown and/or overexpression of L3MBTL3. Shown are means ±s.d. of triplicate experiments. P values were estimated via a one-way ANOVA model on log-transformed data where the difference of differences was tested, which is equivalent to testing the interaction in a two-way ANOVA model. Western blot analysis validates the overexpression of L3MBTL3 and the shRNA-mediated depletion of RBPJ (Appendix Fig S3E). Gene expression analyses of OCT4 was performed as control (Appendix Fig S3F).

F L3MBTL3 occupancy at the proximal Notch-responsive elements of Notch target genes is dependent on its RBPJ interaction domain. ChIP analyses of HA-L3MBTL3 WT and HA-L3MBTL3-Δ(1-64) occupancy at the proximal Notch-responsive elements of Notch target genes. Shown are means ±s.d. of duplicate experiments measured twice each.

G The L3MBTL3-(1-64) domain is required for the downregulation of HES1 and HEY2 in U87-MG cells. Expression analysis of Notch target genes upon overexpression of L3MBTL3 WT, L3MBTL3-Δ(1-64) or LacZ control (Control). Shown are means ±s.d. of triplicate experiments. [*] P<0.05, [**] P<0.01, NS: Not Significant; one-way ANOVA model on log-transformed data.

In panels C, D and F: distance in base pairs (bp) relative to the transcriptional start site (TSS) is indicated below the gene names. Chrom8 was used as negative control (NEG).