EMBO/SourceData huggingface dataset:
Figure 5RAW 247.6 macrophages loaded with a cytosolic chemical dye (Cyto dye) to detect global cytosolic Ca2+, and heterologously expressing (B) TPC1-G-GECO1.2 (TPC1-GG) or (C-E) TPC2-G-GECO1.2 (TPC2-GG) to detect peri-endo-lysosomal Ca2+ domains, which were not detected by (F) a TPC2 mutant (D276K)-G-GECO1.2 that blocks ion permeation or (A) unfused cytosolic G-GECO1.2 (Cyto GG). (A-F) Single-cell Ca2+ traces upon FcγR activation by opsonized 3-μm beads in -Ca2+o expressed as a percentage of the maximum fluorescence of the indicator, determined by adding 2 μM ionomycin and 10 mM CaCl2 at the end of each experiment (% Fmax) (D) TPC2-G-GECO1.2 activity was inhibited by 10 µM Ned-19, but was unaffected by (E) chelating global Ca2+ with EGTA/AM (100 μM for 2 min prior to bead addition). Summary data of the first spike from cells A-F (subsequent spikes show the same pattern; Appendix Fig. S4B), n = 87-274 cells; ***P<0.001 vs Cyto GG, ### P<0.001 vs TPC2-GG ctrl, ††† P<0.001 vs Cyto GG. Fusion of G-GECO1.2 to TPC2 did not alter the affinity of G-GECO1.2 for Ca2+ determined in permeabilized cells (n = 34-71 cells).(I) Single-cell Ca2+ traces upon FcγR activation by opsonized 3-μm beads in -Ca2+o expressed as a percentage of Fmax. (I, J) Pre-emptying the ER stores with CPA or thapsigargin (Tg) abolished the global cytosolic Ca2+ response evoked by beads, but a TPC2-G‑GECO1.2 component remained, n = 17 - 121 cells.No local Ca2+ signal was detected with TPC2-G-GECO1.2 when Ca2+ spiking was evoked by ER-Ca2+ release with 100 μM UTP (K, L) or 10 μM CPA (M); only a bystander response equivalent to unfused cytosolic G-GECO1.2 was detected (n = 121-182 cells; *P<0.05).
Figure 6Translocation of CB, a non-Ca2+ binding CB mutant (CB mut) or a triple mTagBFP2 (BFP) to the lysosome (LAMP1), as indicated by the increase in the Pearson's correlation coefficient was induced by 250 nM rapalog (30 mins) compared with ethanol (EtOH) control-treated RAW 247.6 cells. n = 11-25 cells; ***P<0.001.Images of a single RAW 247.6 cell displaying yellow puncta indicative of successful re-positioning of CB (in green) to the lysosome (in red) in the presence of rapalog but not EtOH.When CB was brought to the lysosome (+rapalog) uptake of beads was inhibited, whilst the non-Ca2+ binding CB (CB mut; n = 46-187 cells) or triple mTagBFP2 (BFP; n = 38-52 cells) did not block phagocytosis;***P<0.001.Bead uptake in BMDMs with and without loading of 25 µM EGTA/AM and 10 μM Ned-19. EGTA-insensitive phagocytosis of beads was inhibited by Ned-19 (n= 75-102 cells) in WT BMDM; ***P<0.001.RAW 247.6 macrophages expressing cytosolic G-GECO1.2 (Cyto GG), TPC2-G-GECO1.2 (TPC2-GG) or TRPML1-G-GECO1.2 (TRPML1-GG). (F) Single-cell Ca2+ traces upon FcγR activation by opsonized 3-μm or 6-μm beads in -Ca2+o expressed as a percentage of the maximum indicator fluorescence (% Fmax = 2 μM ionomycin and 10 mM CaCl2). (G) Summary of first Ca2+ spike; n = 69-121 (3-μm bead), 22-46 (6-μm beads) cells; ***P<0.001, **P<0.01 vs Cyto GG, ### P<0.001 TPC2-GG vs TRPML1-GG.
Figure 7Dynamin inhibitors (80 μM Dynasore or 20 μM Dyngo-4a) inhibit phagocytosis of opsonized 3-μm beads in WT BMDM; n = 101-149 cells, ***P<0.001.Rescue of the TPC-KO dynamin defect by the dynamin activator, Ryngo-1-23 (80 μM): mean number of internalised beads per cell as a percentage of the WT control; n = 128-241 cells, **P<0.01, ***P<0.001.In WT BMDM, expression of a dominant-negative dynamin-2 mutant (Dyn2 K44A) reduced phagocytosis (n = 68-184). Expression of wildtype dynamin-2 (Dyn2) or constitutively active dynamin-2 (S764A mutant, mimicking the dephosphorylated state) in Tpcn1-/- macrophages restored phagocytosis of 3-μm beads after 10 min, n = 10-76 cells; ***P<0.001 vs WT control, ### P<0.001 vs Tpcn1-/- control.Single WT BMDM expressing HA-tagged dynamin-2 (immunolabelled with anti-HA, in red) undergoing phagocytosis of IgG-3-μm beads (blue). Images were taken 10 or 30 min post-addition of beads; actin (green) labelled with Phalloidin Alexa 488.Calcineurin inhibitors, FK506 (10 μM) or cyclosporin A (CsA, 10 μM) inhibited phagocytosis in WT cells, n = 65-159 cells. Ryngo (80 μM) rescued phagocytosis defects in Tpcn1-/- BMDM even in the presence of FK506 or CsA, n = 103-208 cells.Calcineurin activity and cytosolic Ca2+ responses simultaneously monitored in single RAW 247.6 using CaNAR2 and jRGECO1a, respectively, upon addition of 3-μm beads. CaNAR2 signals (FRET Y/C) were inhibited by FK506 (10 μM) and Ned-19 (10 μM); (H) single-cell traces and (I) mean maximum responses. n = 65-169; ***P<0.001 vs control.Phagocytosis induced dephosphorylation of dynamin-2 (ratio of phospho-dynamin to total dynamin-2 expressed as a percentage of WT at time zero) in WT BMDM, but not in Tpcn1-/- BMDM; **P<0.01, ***P<0.001 (time-point matched unpaired t-test) n = 10-15. Measured using in-cell western assay, representative wells of plate image: total dyn2 (red) and phospho-dyn2 (green). See also Appendix Figures S6 and S7.
Figure 8RAW 246.7 macrophages expressing the dynein-binding protein (mTagBFP2-BicD2-FKBP12) for rapalog-induced lysosome repositioning to the MTOC, also co-expressed HsLAMP1-mCherry with or without a C-terminal FRB* (LAMP-FRB* or LAMP, in red). Cells were treated with 0.1% ethanol or 250 nM rapalog for 2 h. Only the tripartite complex of FKBP12-rapalog-FRB induced clustering of lysosomes at the MTOC (A, B). This clustering was selective for lysosomes because ER and mitochondria (KDEL-GFP and MitoTracker Green) were not affected (C). (A, B) Phagocytosis of IgG-3-μm beads was reduced by immobilizing lysosomes at the MTOC, n = 80-564 cells; ***P<0.001.Activation of dynamin-2 with Ryngo 1-23 or expression of constitutively active dynamin-2 (S764A mutant, expression confirmed by the grayscale image) restored phagocytosis of IgG-3-μm beads (n = 34-51 cells), but had no effect on the phagocytosis of IgG-6-μm beads, n = 36-72 cells (E); ***P<0.001 EtOH Ctrl vs rapalog Ctrl, ###P<0.001 rapalog Ctrl vs rapalog Ryngo/Dyn2S764A.
figf2(a) Relative CK2α protein concentration over time following cytoplasmic microinjection of REF52 cells with the HA-tagged semisynthetic proteins bearing different modifications using immunocytochemistry with HA-specific antibody. Data represent mean values ± s.d. (b) Relative CK2α protein concentration following injection of β subunit together with CK2α proteins. Data represent mean values ± s.d. (c) Relative CK2α protein concentration following injection of proteasome inhibitor (1 μM MG132) together with unmodified CK2α protein. Data represent mean values ± s.d.(d) Western blot for total CK2α protein in HeLa cells following treatment with Cdk inhibitors. Numbers indicate relative quantification normalized for loading control. Mean values (n = 3) shown ± s.d.(e) Western blot for total CK2α protein in HeLa cells following treatment with nocodazole to arrest cells in mitosis. Full gels corresponding to those in panels d and e are in Supplementary Figure 8.
figf3(a) Pull-down experiments with semisynthetic HA-CK2α protein and recombinant Pin1. CK2α was immobilized using HA-specific (anti-HA) antibodies bound to protein G beads. Pin1 was incubated with immobilized CK2α for 20 min at 4 °C.(b) Coimmunoprecipitation of endogenous Pin1 with CK2α. Pfa-containing and unmodified semisynthetic HA-CK2α proteins were spiked into REF52 cell lysates and immobilized using HA-specific antibodies. Input samples are shown for loading control.(c) Pull-down experiments with Pfa344 HA-CK2α protein and recombinant Pin1 in the presence of Pin1-specific or nonspecific IgY.(d) Relative CK2α protein concentration over time following microinjection of Pfa344 CK2α with Pin1-specific IgY or nonspecific IgY (control). Data represent mean values ± s.d. Full gels corresponding to those in panels a-c are in Supplementary Figures 10 and 11.
figf4(a) Phosphorylation of C-terminal tail CK2α peptides (residues 337-352) by Cdk1-cyclin B. In vitro Cdk1-cyclin B kinase assays were performed using the following peptide substrate: SSMPGGSTPVXSANMMK(εBiotin), where X = serine or S-GlcNAc serine. After reactions were quenched, peptides were separated from the reaction mixture on Tris-tricine gels. Data represent mean values ± s.d.(b) Immunoprecipitation and western blot for O-GlcNAc CK2α in HeLa cells after treatment with the O-GlcNAcase inhibitor TMG for 12 h. Numbers indicate relative quantification normalized for total CK2α concentrations.(c) Western blot for total CK2α protein in HeLa cells following treatment with TMG for 12 h or 16 h. Numbers indicate relative quantification normalized for loading control, mean values (n = 4) shown ± s.d. Full gels corresponding to those in panels b and c are in Supplementary Figures 14 and 15.
figf5Phosphorimage analysis of in vitro CK2 kinase assays with protein substrates. All reactions were performed at 30 °C. Numbers indicate the concentration (nM) of product for each kinase reaction. (a) AHCYL2 substrate (25 ng μl−1) with 100 μM ATP and 10 nM CK2α ± 11 nM CK2β for 6 min. (b) NAP1L3 substrate (15 ng μl−1) with 100 μM ATP and 10 nM CK2α ± 11 nM CK2β for 6 min. (c) NIPBL substrate (50 ng μl−1) with 100 μM ATP and 5 nM CK2α ± 11 nM Pin1 for 5 min. Full gels corresponding to those in panels a-c are in Supplementary Figures 19 and 25.
Figure 5(B) Levels of PIN2 phosphopeptide in our experiments. Bars represent the mean plus standard error of replicates (2 biological replicates for nitrate treatments at 20 min (Col-0 roots) and 3 biological replicates for all other experimental conditions). Each independent biological replicate consisted of a pool of 4.500 roots collected from Arabidopsis plants grown independently under the same experimental conditions. The asterisk indicates statistically significant differences in phosphoproteomic analysis (multiple t-test comparison without testing corrections, assuming same variance, p < 0.05).(C) Detection of phosphorylation PIN2 by Phos-tag Western blotting. Arabidopsis plants (Col-0) were growth in ammonium as only nitrogen source, and treated with 5 mM KNO3 or 5mM KCl as control. Total protein from roots were analyzed in SDS PAGE using Phos-tag to detect changes in phosphorylation status. Immunoblotting was performed with PIN2 antibody. Total proteins isolated from eir1.1 roots were used as a negative control. White and red asterisks indicate a slow- or fast-mobility band corresponding to a more or less phosphorylated PIN2, respectively.(D) Western blot against PIN2 protein comparing nitrate treated (KNO3) and control (KCl) condition in Arabidopsis roots for all genotypes (eir1-1 mutant background was complemented with PIN2::PIN2wt-GFP (PIN2wt), PIN2::PIN2S439D-GFP (PIN2S439D phospho-mimic point mutation) or PIN2::PIN2S439A-GFP (PIN2S439A, phospho-null point mutation).
Figure 6(A) Primary root length of Col-0 wild type plants or eir1-1 mutant plants was measured using the ImageJ program 3 days after 5 mM KNO3 or KCl treatments. Tukey box plot show results from 3 independent biological replicates per experimental condition (n = 10-15 roots each replicate). The box plot shows the data within the interquartile range (25th and 75th percentiles) and a solid black line represents the median. Whiskers show maximum and minimum values no further than 1.5x IQR (interquartile range). Outlier data are plotted individually. Asterisk indicates statistically significant difference between analyzed by unpaired, two-tailed and assuming equal variance t-test (** p < 0.01).(B) Number of initiating and emerging lateral roots of Col-0 or eir1-1 mutant plants were counted using light microscopy 3 days after 5 mM KNO3 or KCl treatments. Tukey box plot show results from 3 independent biological replicates per experimental condition (n = 10-15 roots each replicate). The box plot shows the data within the interquartile range (25th and 75th percentiles) and a solid black line represents the median. Whiskers show maximum and minimum values no further than 1.5x IQR (interquartile range). Asterisk indicates statistically significant difference between analyzed by unpaired, two-tailed and assuming equal variance t-test (** p < 0.01).
Figure 7(A) Primary root length of the different genotypes was measured using the ImageJ program 3 days after 5 mM KNO3 or KCl treatments. Tukey box plot show results from 3 independent biological replicates per experimental condition (n = 8-10 roots each replicate). The box plot shows the data within the interquartile range (25th and 75th percentiles) and a solid black line represents the median. Whiskers show maximum and minimum values no further than 1.5x IQR (interquartile range). Outlier data are plotted individually. Asterisk indicate statistically significant difference between means analyzed by unpaired, two-tailed and assuming equal variance t-test (*p < 0.05, **p < 0.01).(B) Number of initiating and emerging lateral roots for all genotypes were counted using light microscopy 3 days after 5 mM KNO3 or KCl treatments. Tukey box plot show results from 3 independent biological replicates per experimental condition (n = 8-10 roots each replicate). The box plot shows the data within the interquartile range (25th and 75th percentiles) and a solid black line represents the median. Whiskers show maximum and minimum values no further than 1.5x IQR (interquartile range). Outlier data are plotted individually. Asterisk indicate statistically significant difference between means analyzed by unpaired, two-tailed and assuming equal variance t-test (*p < 0.05, **p < 0.01).