EMBO/SourceData huggingface dataset:
Figure 6A-B. Involvement of filamentous cytoskeletal structures in BiFC foci polarization. Time-lapse micrographs of agarose-embedded cells expressing the Dsl1pVN•ε-COPVC BiFC combination at RT with fresh PM Glc+ura medium supply. (A) Upon disruption of actin filaments with 1,25 μM latrunculin A, COPI•Dsl BiFC signals dispersed. Arrowheads: polarized signal, asterisks: unpolarized localization. Fluorescent images are displayed with inverted brightness values. Scale bar 10 μm.A-B. Involvement of filamentous cytoskeletal structures in BiFC foci polarization. Time-lapse micrographs of agarose-embedded cells expressing the Dsl1pVN•ε-COPVC BiFC combination at RT with fresh PM Glc+ura medium supply. (B) Microtubuli disruption through 24 μg/ml nocodazole did not affect polarization of the COPI•Dsl BiFC signals. Arrowheads: polarized signal, asterisks: unpolarized localization. Fluorescent images are displayed with inverted brightness values. Scale bar 10 μm.C-E. Involvement of myosin motors in BiFC foci polarization. Time-lapse micrographs of agarose-embedded cells carrying the COPI•Dsl BiFC pairs Dsl1pVN•ε-COPVC or β'COPVN•Dsl3pVC were taken. Either wild type cells (E) or mutants carrying the myosin V mutations myo2-66 (C) or myo4∆ (D) were analyzed. Cells were grown at RT with fresh PM Glc+ura medium supply. In the myo2-66 cells, the BiFC signal polarization was hardly detectable even at permissive temperature, while it was unaffected in myo4∆ compared to the control cells.F. Fluorescence micrographs of β'-COPVN•Dsl3pVCcells carrying the myo2-66 defect. COPI•Dsl BiFC, as well as ER or Golgi markers were analyzed. While the BiFC spots were dispersed in these mutants, they retained their association with ER and Golgi. Scale bar 5 μm.
Figure 7A-B. Immuno-electron micrographs showing the buds and the neck region of two β'-COPVN•Dsl3pVCcells. Both parts contain an overview image (left) and two zoomed details (right). Slides were decorated with antibody against COPI and visualized with protein A-conjugated 10 nm gold particles. Gold particles mark electron-dense areas in apposition to membranes and/or vesicular structures, which are localized at the side of the bud and the bud neck of the mother cell. Scale bar 100 nm.C. Fluorescence micrograph of a budding cell carrying β'-COPVN•Dsl3pVC (green) and RFPHDEL (red). Arrowheads mark BiFC signals which may correspond to the localizations found in (A) and (B). Scale bar 2 µm.D. COPI-positive, electron-dense structures in close apposition to perinuclear ER. 10 nm gold particles mark COPI. Scale bar 100 nm.E. Accumulation of COPI-positive vesicles. 10 nm gold particles mark COPI. PM: plasma membrane, nuc: nucleus. Scale bar 100 nm.
Figure 1(A) Human myeloid cells and lymphoid cells were purified from PBMCs using a cell sorter. Total RNA was isolated from these primary cells and primary AECs to perform chip hybridization and microarray analysis.The profile of EphA2 expression in different cells is indicated. (B) Murine B cells and T cells were purified from spleens using a cell sorter, total RNA was isolated from murine B cells, T cells, BMDCs, BMDMs, AMs and AECs. Shown is mean ± SD. Data represent three independent biological replicates.The profile of EphA2 expression in different cells is indicated. (C) Immunoblot analysis of EphA2 and β-actin in BMDCs, BMDMs, AMs, and AECs.
Figure 2(A-D) ELISA of IL-1β, IL-18, IFN-β and IL-6 in supernatant of AEC cells, which were stimulated for 16 h with RNA virus reovirus (MOI=5) or DNA virus HSV-1 (MOI=5). n = 3 primary samples. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. Mock indicated unstimulated cells. **P <0.01 and ***P<0.001 (unpaired t test). NS means no statistical difference. Data represent three independent biological replicates.(E) Immunoblot analysis of IL-1β and caspase-1 in AECs cell lysate or cell supernatant, β-actin served as a loading control throughout. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. Mock indicated unstimulated cells. **P <0.01 and ***P<0.001 (unpaired t test). NS means no statistical difference. Data represent three independent biological replicates.
Figure 3(A-B) ELISA of IL-1β and IL-18 in BALF samples were from wild-type (WT) and EphA2-kockout (KO) mice (n=3 per strain) on day 1 and day 3 after intranasal infection with reovirus (4×104 PFU per mouse). Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three independent biological replicates.Cell number of BALF samples were from wild-type (WT) and EphA2-kockout (KO) mice (n=3 per strain) on day 1 and day 3 after intranasal infection with reovirus (4×104 PFU per mouse). Shown is mean ± SD. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three independent biological replicates.Cell number and category of BALF samples were from wild-type (WT) and EphA2-kockout (KO) mice (n=3 per strain) on day 1 and day 3 after intranasal infection with reovirus (4×104 PFU per mouse). Shown is mean ± SD. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three independent biological replicates.(F) Hematoxylin and eosin (H&E)-staining of lung sections were from EphA2+/+ and EphA2−/− mice intranasally infected with reovirus (4×104 PFU per mouse) on day 0, day 1 and day 3. Scale bars represent 200μm.(G) Immunoblot analysis of EphA2 and IL-1β in lung homogenates were from wild-type (WT) and EphA2-kockout (KO) mice on day 1 and day 3 of intranasal infection with reovirus (4×104 PFU per mouse), β-actin served as a loading control throughout.
Figure 4Quantitative RT-PCR analysis of mRNA encoding various cytokines (IL-4, IL-5, IL-13 in lung samples from wild-type (WT) and EphA2-knockout (KO) mice (n=4 per strain) sensitized with ova; results presented relative to β-actin. Shown is mean ± SD. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three or four independent biological replicates.Quantitative RT-PCR analysis of mRNA encoding various cytokines IL-33) in lung samples from wild-type (WT) and EphA2-knockout (KO) mice (n=4 per strain) sensitized with ova; results presented relative to β-actin. Shown is mean ± SD. (C) ELISA analysis of IL-33 in lung tissue homogenate samples from wild-type (WT) and EphA2-knockout (KO) mice (n=3 per strain) sensitized with ova. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three or four independent biological replicates.(D-G) ELISA analysis of IL-4, IL-13, IL-1β and IL-18 in lung tissue homogenate samples from wild-type (WT) and EphA2-knockout (KO) mice (n=3 per strain) sensitized with ova. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three or four independent biological replicates.(H) Cell number and category of BALF samples from wild-type (WT) and EphA2-knockout (KO) mice (n=3 per strain) sensitized with ova. Shown is mean ± SD. Data information: Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. *P<0.05, **P <0.01 and ***P<0.001 (unpaired t test). Data represent three or four independent biological replicates.(I) H&E staining and PAS staining of lung sections from wild-type (WT) and EphA2-knockout (KO) mice sensitized with ova. Scale bars represent 200μm.
Figure 5(A) Immunoblot analysis of proteins precipitated with anti-EphA2 or IgG (control) were from whole-cell lysates of AECs from wild-type mice stimulated with reovirus (MOI=5) for 3 h. Input, 10% of the AECs lysate. Data information: The position of protein markers (shown in kDa) is indicated on the right-hand side. Data are representative of three independent biological replicates.(C) The indicated plasmids of HA-tagged full-length EphA2 and EphA2 truncation mutants were respectively transfected into HEK293T cells along with Myc-tagged NLRP3, and then cell lysates were immunoprecipitated with anti-Myc antibody, followed by western blot analysis with anti-HA antibody and anti-Myc Antibody. Data information: The position of protein markers (shown in kDa) is indicated on the right-hand side. Data are representative of three independent biological replicates.(D) The indicated plasmids of HA-tagged full-length NLRP3 and NLRP3 truncation mutants were respectively transfected into HEK293T cells along with Myc-tagged EphA2, and then cell lysates were immunoprecipitated with anti-Myc antibody, followed by western blot analysis with anti-HA antibody and anti-Myc antibody. Data information: The position of protein markers (shown in kDa) is indicated on the right-hand side. Data are representative of three independent biological replicates.(E) Colocalization of endogenous EphA2 and NLRP3 in AEC cells. AEC cells were unstimulated or stimulated with reovirus for 2h before confocal microscopy analysis. EphA2 was stained with rabbit anti-EphA2 (1:500), followed by Alexa Fluor 594 goat anti-rabbit secondary antibody (red), while NLRP3 was stained with mouse anti-NLRP3 (1:500), followed by Alexa Fluor 488 goat anti-mouse secondary antibody (green). DAPI (4′,6-diamidino-2-phenylindole) served as the nuclei marker (blue). Scale bars represent 20μm. The Pearson's correlation coefficient and the Mander's overlap coefficient in the upper red box are 0.5, and 0.95 respectively, and the lower red box 0.78, and 0.94 respectively.
Figure 6(A) The indicated plasmids of Myc-tagged NLRP3 and GFP-tagged EphA2 were transfected into HEK293T cells and then cell lysates were immunoprecipitated with the anti-Myc antibody, followed by western blot analysis with the anti-p-Tyr antibody, anti-GFP and anti-Myc.(B) Immunoblot analysis of p-Tyr of NLRP3 precipitated with anti-NLRP3 antibody in AECs without (Ctrl) or with LPS stimulation or reovirus (Reo) infection.(C) The indicated plasmids of Myc-tagged wild-type NLRP3 or its mutants Y132F, Y164F, Y251F, Y570F and Y589F were respectively transfected into HEK293T cells along with GFP-tagged EphA2, and then cell lysates were immunoprecipitated with the anti-Myc antibody, followed by western blot analysis with the anti-p-Tyr antibody, anti-HA antibody and anti-Myc antibody.(D) Immunoblot analysis of EphA2, ASC, NLRP3, caspase-1 and IL-1β in HEK293T cells were co-transfected with 200ng EphA2, 40ng ASC, 40ng caspase-1 and 200ng IL-1β, vector or wild NLPR3 or Y132F as indicated. The position of protein markers (shown in kDa) is indicated on the right-hand side.(E) Densitometry analysis *P<0.05 (unpaired t test). NS means no statistical difference. Shown is mean ± SD. Data represent three independent biological replicates.
Figure 7(A-B) Confocal microscopy analysis of AEC cells uninfected or infected with reovirus at multiplicity of infection (MOI) of 20 for 3h. AECs primed with LPS and stimulated with ATP for 30 min severed as a positive control. ASC was stained with mouse anti-ASC (1:200), followed by Alexa Fluor 488 goat anti-mouse secondary antibody (green). DAPI served as the nuclei marker (blue). Data information: Scale bars represent 50μm. Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. **P <0.01 and ***P<0.001 (unpaired t test). Data represent three independent biological replicates.(C-D) Confocal microscopy analysis of HEK293T cells transfected with flag-ASC and Myc-tagged vector or Myc-tagged NLRP3 or Myc-tagged NLRP3 Y132F. Cells were stained with anti-flag (1:200), anti-Myc (1:200), followed by Alexa Fluor 488 goat anti-rabbit secondary antibody (green) or Alexa Fluor 594 goat anti-mouse secondary antibody (red). DAPI served as the nuclei marker (blue). Data information: Scale bars represent 50μm. Each symbol represents an independent experiment; small horizontal lines indicate the average of triplicates. **P <0.01 and ***P<0.001 (unpaired t test). Data represent three independent biological replicates.
Figure 2GST-Mif2_1-41 was immobilized on GSH Sepharose beads and incubated with Mtw1-Nnf1 complex (MN) in the presence of increasing concentrations of Ame1_1-20 peptide (lanes 4-9). GST-Ame1_1-30 served as control (lane 2 and 3). After washing, bound complexes were eluted by adding SDS sample buffer. Protein bands in Coomassie stained gel are highlighted in the indicated color. Integrated density of Mtw1 bands was quantified using ImageJ and correlated to GST-Mif2 amounts in the same lane.Binding of FITC-Mif21-41 to MN was directly determined in a fluorescence polarization (FP) assay. This interaction at EC50 was than competed with increasing concentration of Ame11-20 unlabeled peptide. Both experiments were performed in triplicates of which the mean and standard deviation is shown.Equivalent point mutations replacing Arg11 in Mif2 or Arg10 in Ame1 with Alanine prevent binding to the MN complex. Mif2 and Ame1 wild-type N-termini serve as a control, protein bands are highlighted in the indicated color.
Figure 3Analysis of these Mtw1 mutants in vivo using the anchor-away technique. Mtw1-FRB strains containing RPL13-FKBP12 for cytoplasmic anchoring and additionally harboring the indicated rescue alleles were plated in serial dilution on YEPD or YEPD + Rapamycin plates incubated at 30 °C.Tetrad analysis of Mtw1-wt or mutants. Surviving spores in which the Mtw1-wt or mutant rescue construct was the only source of Mtw1 are indicated in pink circles.Western blotting confirming the expression of Mtw1-6x-Flag wt or mutant proteins in the Mtw1-FRB strain background.Analytical SEC runs and accompanying SDS-PAGE of Mtw1c-wt or -5A mutant (blue), AO (grey) or a stoichiometric combination of both complexes (green) at 10 µM each. Boxes indicate corresponding fractions in left and right panel. Note that the same Ame1-Okp1 elution profile and SDS-PAGE (middle panel) is displayed in both sets to improve clarity.
Figure 4Analysis of Ame1 N-terminal deletion and swap mutant using the anchor-away technique. Ame1-FRB strains containing RPL13-FKBP12 for ribosome anchoring and additionally harboring the indicated rescue alleles were plated in serial dilution on YEPD or YEPD + Rapamycin plates incubated at 30 °C.Expression levels of 3xHA tagged Ame1 rescue constructs from (B) analyzed by western blotting.Tetrad dissection of strains where one endogenous copy of Ame1 was replaced with the indicated construct.Phenotypic analysis of different Ame1 rescue constructs using fluorescence microscopy. Images of representative large budded cells immediately and 4 h after Rapamycin addition are shown, indicated as t = 0 h and t = 4 h. Brightfield images show the morphology of the corresponding yeast cell. Only large budded cells were included in the analysis. One kinetochore cluster is enlarged in the white box. Scale bar represents 5 µm.Quantification of (E) in which large budded cells were classified according to their Mtw1-GFP signal into the three indicated groups. Scale bar represents 5 µm. A total of 100 cells was quantified for every strain. Mean values of the three indicated groups were calculated and plotted in a bar chart. Error bars indicate the SEM of 3 independent experiments.Analysis of Mif2 N-terminal and swap mutant using the anchor-away technique as for (B). Phenotypes of the indicated Mif2 constructs were observed in an otherwise wild-type or ctf19∆ background.Western blotting showing 6xFlag tagged Mif2 expression levels of strains from (G).
Figure 5Co-purification of Strep-Mtw1c through Flag-Mif2 after co-expression in insect cells. Proteins were detected by western blotting using their respective tags.Western blotting of elution fractions from an SEC experiment of Mif2-wt or Mif2Ame1-N swap in the absence (upper panel) or presence (lower panel) of Mtw1c.ITC analysis of Mif21-41 or Ame11-20 binding to MN. Experiments were performed 3 or 4 times, respectively. One representative binding curve is shown, whereas the KD value represents the average of all experiments.Cross-link (XL) MS analysis of the Mif2wt protein in isolation or bound to Cse4n using the cross-linker Bis[sulfosuccinimidyl] glutarate. Mif2wt alone or in combination with Cse4n were subjected to analytical size exclusion chromatography at 10 µM concentration. The corresponding Coomassie-stained SDS-PAGE gels of Mif2-wt alone or in combination with Cse4n are shown. Fractions used for cross-linking are highlighted. Topological map of Mif2 based on the identified intra-molecular cross-links. Common cross links that are found in both samples are shown in red, whereas unique crosslinks that can be only found in one of the samples are highlighted in blue. Conserved regions and their described functions are indicated. A list of cross-links that link N-terminal residues to C-terminal regions of Mif2 is shown for Mif2 alone and bound to Cse4n leading to a proposed conformation of Mif2.
Figure 6Mif2Flag-wt or -∆sigAT directly from insect cell lysate was immobilized on M2 Flag Agarose, washed and incubated with Mtw1-Nnf1 complex (MN). After washing, bound complexes were eluted by adding 3xFlag peptide. Western blotting against the His-tag on Nnf1 confirmed increased binding of MN to Mif2-∆sigAT, already visible in the Coomassie stained SDS-PAGE gel.Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Mif2-wt or Mif2-∆sigAT and MN alone and in combination at 10 µM concentration. All combinations were incubated for 1 h at 4°C prior to the run. MN (blue), Mif2 (red), combination (green). Note that the same MN elution profile and SDS-PAGE (upper panel) is displayed in both sets to improve clarity. Dashed boxes highlighting corresponding fractions were included to improve comparability.
Figure 7Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Cse4n (light blue), Mif2-wt (red), combination (green). Note that the same Cse4n (upper panel) and Mif2 (middle panel) elution profiles and SDS-PAGEs are also displayed as reference in B and C (Mif2) or C (Cse4n) to improve clarity.Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Mtw1c (blue), Mif2-wt (red), combination (green). Note that the same Mtw1c (upper panel) elution profile and SDS-PAGE is also displayed as reference in C to improve clarity.Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Mtw1c (blue), Cse4n (light blue), Mif2-wt (red), combination (green).Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Cse4n (light blue), Mif2Ame-1N swap (red), combination (green). Note that the same Cse4n (upper panel) and Mif2Ame-1N swap (middle panel) elution profiles and SDS-PAGEs are also displayed as reference in E and F (Mif2Ame-1N swap) or F (Cse4n) to improve clarity.Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Mtw1c (blue), Mif2Ame-1N swap (red), combination (green). Note that the same Mtw1c (upper panel) elution profile and SDS-PAGE is also displayed as reference in F to improve clarity.Analytical SEC chromatograms and corresponding Coomassie stained SDS-PAGE gels of Mtw1c (blue), Cse4n (light blue), Mif2Ame-1N swap (red), combination (green).
Figure 8Phenotypic analysis of Mif2 mutants using a galactose inducible overexpression system. Strains harboring the indicated Mif2 expression constructs on pESC plasmids were plated in serial dilution on doHIS-Glucose or doHIS-Raffinose/Galactose plates and incubated at 30 °C.Serial dilution assay of chromosomally integrated Mif2 variants under the control of the pGAL promoter. Strains were plated on YEP-Glucose and YEP-Raffinose/Galactose plates.Analysis of chromosome segregation in strains from (B). Distribution of fluorescently labeled Chromosome III was analyzed in large-budded cells 16 hours after switching the medium to Galactose. Scale bar represents 2 μm.Microscopic analysis of kinetochores in Mif2 overexpressing cells visualizing Mtw1-GFP and Spc42-mCherry. Images of representative large budded cells after 16h in Galactose are shown. One kinetochore cluster is enlarged in the white box for each strain. Scale bar represents 5 µm. Brightfield images show the morphology of the corresponding yeast cell. Only large budded cells were included in the analysis. Quantification of (D) in which large budded cells were classified according to their Mtw1-GFP signal into the four indicated groups. A total of 100 cells was quantified for every strain. Mean values of the three indicated groups were calculated and plotted in a bar chart. Error bars indicate the SEM of 2 independent experiments.Co-IP experiment of indicated Mif2-Flag variants and Mtw1-Myc from yeast cell extracts.Phenotypic analysis of Mif2-∆sigAT mutant using the same galactose inducible overexpression system as in (A). Strains harboring the indicated Mif2 expression constructs on pESC plasmids were plated in serial dilution on doHIS-Glucose or doHIS-Raffinose/Galactose plates and incubated at 30 °C.
Figure 1Comparable mean SV number per ribbon in wild-type at the distal (Ds., H) and the proximal (Pr., I) part of the ribbon. More SVs are observed at inhibitory OtofPga/Pga ribbons compared to inhibitory wild-type synapses at both ribbon parts, and further at OtofPga/Pga synapses under rest in the Pr. part. Data are presented as mean ± SEM; the red dotted line highlights the wild-type mean SV number per ribbon under rest as a reference point;Representative virtual sections of wild-type (J) and OtofPga/Pga (K) ribbon synapses under inhibition. Counted RA-SVs are marked with white asterisks. Magnification, 12,000x; scale bar, 100 nm.Exemplary virtual sections of wild-type and OtofPga/Pga under inhib (L,M), rest (L',M') and stim (L'',M''). At OtofPga/Pga SVs are densely packed. Blue arrowheads indicate proteinaceous filaments between wild-type SVs. Magnification 12,000x; scale bar, 100 nm.
Figure 2Illustrations show the two major SVs associated with filament/s in the wild-type RA-SV pool at rest; synaptic ribbon (R, red), SVs (dark green) with filament/s (blue). Not drawn to scale. (A,B) Ri-attached SVs (Ri.) and (C,D) interconnected SVs (In.) harbor single (A,C) or multiple (B,D) filaments. Example virtual section from resting wild-type; single Ri. (A',A'') and In. (C',C''), multiple Ri. (B',B'') and In. (D',D''). Magnification 12,000x; scale bar, 40 nm. Structures are color-coded similarly to the illustrations, the number of ribbon-attached filaments per SV are indicated with red arrowhead/s and interconnectors per SV with purple arrowhead/s in A'', B'', C'' and D''. Magnification 12,000x; scale bar, 40 nm.The graph is representing the percentage of RA-SVs around the whole ribbon at wild-type under inhib, rest and stim. Upon stimulation, the percentage of SVs without filaments and ribbon-attached SVs are significantly reduced, while interconnected SVs increased significantly.