Abstract
Chromatin relaxation is a prerequisite for the DNA repair machinery to access double-strand breaks (DSBs). Local histones around the DSBs then undergo prompt changes in acetylation status, but how the large demands of acetyl-CoA are met is unclear. Here, we report that pyruvate dehydrogenase 1α (PDHE1α) catalyzes pyruvate metabolism to rapidly provide acetyl-CoA in response to DNA damage. We show that PDHE1α is quickly recruited to chromatin in a polyADP-ribosylation-dependent manner, which drives acetyl-CoA generation to support local chromatin acetylation around DSBs. This process increases the formation of relaxed chromatin to facilitate repair-factor loading, genome stability and cancer cell resistance to DNA-damaging treatments in vitro and in vivo. Indeed, we demonstrate that blocking polyADP-ribosylation-based PDHE1α chromatin recruitment attenuates chromatin relaxation and DSB repair efficiency, resulting in genome instability and restored radiosensitivity. These findings support a mechanism in which chromatin-associated PDHE1α locally generates acetyl-CoA to remodel the chromatin environment adjacent to DSBs and promote their repair.
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Data availability
The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium repository via the PRIDE partner repository with the dataset identifier PXD040676. The STRING database (https://cn.string-db.org/) was used for the functional network analysis of the proteomics data. The raw sequencing data and the processed data are available from the Gene Expression Omnibus (GEO) under accession number GSE237929. The imaging datasets generated and analyzed during the current study are not publicly available, as the large amount of data could not be uploaded to a repository, but are available from the corresponding author upon request. Source data are provided with this paper.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (grant nos. 32090030, 81720108027 and 81530074 to W.-G.Z.; grant no. 82002986 to J.Z.); the National Key R&D Program of China (grant no. 2017YFA0503900 to W.-G.Z.); the Science and Technology Program of Guangdong Province in China (grant no. 2017B030301016 to W.-G.Z.); Guangdong Basic and Applied Basic Research Foundation (grant nos. 2019A1515110041 and 2021A1515011126 to J.Z.); the Shenzhen Municipal Commission of Science and Technology Innovation (grant nos. JCYJ20200109114214463 and JCYJ20220818100015032 to W.-G.Z.; grant no. RCYX20210706092040047 to Y.T.); and Shenzhen University 2035 Program for Excellent Research to W.-G.Z. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the paper. We thank G. Legube (Université Paul Sabatier, Toulouse, France) for providing the AsiSI-ER-U2OS-AID cells; Y. Zhao (East China University of Science and Technology, Shanghai, China) for providing the citrate sensor construct pcDNA3.1-Citron1-NLS; S. Lin (Xiamen University, Fujian, China) for providing the 13C-isotope-labeled citrate reagent; and J. Tamanini of ETediting, UK for English language editing before submission.
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J.Z. and W.-G.Z. conceptualized the project. J.Z., Y.T., Q.Z., B.P., X.Liu, X.Lu and H.G. were responsible for the study methodology. J.Z., F.C., W.X., Z.L. and L.Q. performed investigations. J.Z. and F.C. wrote the original draft of the paper. J.Z., X.X. and W.-G.Z. reviewed and edited the paper. J.Z. and W.-G.Z. were responding for funding acquisition. X.Liu, B.L. and X.X. were responsible for resources. W.-G.Z. supervised the study.
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Extended data
Extended Data Fig. 1 PDHE1α is recruited to chromatin in response to DNA damage.
a, Western blot showing specific antibody signals for pan-Ac, γH2AX, and H3 in the chromatin and histone fractions from HeLa cells treated with either ionizing radiation (IR) or etoposide. CBB, Coomassie Brilliant Blue. b, Immunofluorescence staining showing pan-Ac and γH2AX signal in laser micro-irritation induced DNA damage sites; nuclei were counterstained with DAPI. Scale bars, 5 μm. c, ChIP-PCR analysis showing the pan-Ac signal distribution of AsiSI-induced DSBs on one side of the chromatin flanking Chr1_6 (chr1:89,231,184-89,231,191). d, Nuclear and cytosolic acetyl-CoA levels were quantified according to a recent protocol (Trefely et al., Mol Cell 82, 447, 2022). Data in c and d are representative of three independent replicates. The statistical analyses were performed using a two-tailed student’s t-test, and shows the mean ± s.d. e, The acetyl-CoA levels in washing/storage buffer fractions collected from the functional nuclei extraction procedure were quantified using a commercial kit. f, ChIP-PCR analysis showing the binding of PDHE1α and RAD51 to DSB sites. RAD51 and IgG were used as positive and negative control respectively. Data in e and f are representative of six and three independent replicates respectively. The statistical analyses were performed using a two-tailed student’s t-test, and shows the mean ± s.d. g, Western blot showing the knockdown efficiency of each siRNA. h, Western blot showing the nuclear and chromatin distribution of multiple components of the PDH complex in HeLa cells treated with IR. i, The activity of acetyl-CoA producing enzymes were confirmed by examining acetyl-CoA levels. n = 3 biological independent replicates were performed. The statistical analyses were performed using a two-tailed student’s t-test, and shows the mean ± s.d. j, Dynamics of PDHE1α and ACSS2 accumulation at DNA damage sites monitored by laser micro-irradiation-coupled live-cell imaging. GFP signal accumulation intensity at DSB stripes was quantified from three independent replicates (n = 20 for each group), the curve shows the mean ± s.e.m. Scale bars, 5 μm.
Extended Data Fig. 2 PDHE1α-catalyzed local acetyl-CoA is required for chromatin acetylation in response to DNA damage.
a, Dynamics of citrate metabolism at DNA damage sites monitored by laser micro-irradiation-coupled live-cell imaging on HeLa cells overexpressing the highly responsive citrate sensor construct, NLS-Citron1/pCDNA3.1. The fluorescence intensity at DSB stripes was quantificated from three independent replicates (n = 20 for each group), the curve shows the mean ± s.e.m. Scale bars, 5 μm. b-c, Volcano plots of the acetyl-modified proteins identified in Fig. 2B. Relative acetylation levels in the IR (b) and 4-OHT (c)-induced DNA damage groups versus the control are plotted on the x-axis as mean log2 ratios. Negative log10 PEP (the maximal posterior error probability for peptides) values are plotted on the y-axis. Significantly enriched proteins are denoted by red and blue dots, 13C isotope-labeled proteins are denoted by green dots, and all others are denoted by gray dots. d-e, Venn diagram showing all identified (d) and 13C isotope-labeled (e) that overlap between significant lysine acetylation sites (upper) and between acetylated proteins (lower) in IR- and 4-OHT-induced DNA damage versus control groups. f, Western blot showing the histone acetylation marks in acid-extracted fractions and the knockdown efficiency in whole cell lysate from HeLa cells transfected with siRNAs targeting PDHE1α, ACLY, and ACSS2 or NC. g-h, Immunofluorescence staining showing the colocalization of γH2AX with pan-Ac (g) and H3K9ac (h) signal in laser micro-irradiatiation induced DNA damage sites, nuclei were counterstained with DAPI. Pan-lysine acetylation intensity at DSB stripes was quantified from three independent replicates where data were collected from 78 cells for g and 51 cells for h group. The statistical analyses were performed using a two-tailed student’s t-test, and shows the mean ± s.d. Scale bars, 5 μm. i, Quantifition of total 13C-isotope -abelled Kac intensity around DSB sites in 13C-pyruvate, 13C-acetate and 13C-citrate cultured cells.
Extended Data Fig. 3 PARP1 activity controls the recruitment of PDHE1α to sites of DNA damage.
a, Co-Immunoprecipitation (Co-IP) analysis of the interaction of PDHE1α and PARP1 in Flag-PARP1 and HA-PDHE1α overexpressed cells. b, Immunoprecipitation analysis of the endogeneous interaction between PDHE1α and PARP1 in the whole cell lysate fraction extracted from HeLa cells. c, Western blot of the PDHE1α signal at chromatin fraction from HeLa cells treated with different doses of olaparib. PAR signaling was used as a positive control of olaparib treatment efficiency. d, Western blot showing that treatment with the PARP1 inhibitors, olaparib and AG14361, had no effect on total protein levels in whole cell lysates extracted from HeLa cells. e, Western blot showing the PDHE1α signal in the chromatin fraction from MEF-WT and MEF-PARP1−/− cells treated with etoposide (10 μM) for 1 h or IR (3 Gy). f, MEF PARP1−/− cells were rescued with Flag-vector and Flag-PARP1 constructs. Western blot showing PDHE1α recruitment in chromatin fractions from HeLa cells following DNA damage. g, Western blot showing the PDHE1α signal in the chromatin fraction from HeLa cells transfected with NC siRNA and siRNA targeting PARP1 and treated with 3 Gy IR. h-i, Dynamics of PDHE1α accumulation at DNA damage sites monitored by laser micro-irradiation-coupled live-cell imaging of HeLa cells stably expressing shNC and shPARP1 constructs (h) and PARP1 inhibitor treated cells (i). GFP signal accumulation intensity at DSB stripes was quantified from three independent replicates (n = 20 for each group), the curve shows the mean ± s.e.m. Scale bars, 5 μm.
Extended Data Fig. 4 PAR binding accelerates PDHE1α PARylation by PARP1.
a, In vitro PARylation assay performed using purified His-PDHE1α in the presence or absence of recombinant PARP1 enzyme, NAD+, and sonicated DNA as well as the PARP1 inhibitor, olaparib. b, PDHE1α was PARylated following DNA damage. c, Co-IP analysis showing that PDHE1α is PARylated by PARP1 in chromatin fractions from HeLa transfected with either control or PARP1 siRNAs. Cells were irradiated with 3 Gy IR. d, PDHE1α is PARylated by PARP1 on the chromatin. HeLa cells were pretreated with PARP inhibitor and then treated with or without IR. The cellular fractions were isolated and subjected to IP with anti-PDHE1α antibody, and the immunoprecipitates were blotted with specific antibodies. e, PDHE1α binds to PAR directly in vitro. His-PDHE1α was used to pull down a commerical PAR protein (20 pmol) in vitro. f, Schematic of the HA-tagged full-length (FL) and deletion mutants of PDHE1α used in this study (top panel). HeLa cells were transiently transfected with these plasmids encoding HA-tagged PDHE1α FL and mutants. Cells were irradiated with 3 Gy IR, then lysed immediately. The cell lysates were incubated with anti-HA affinity matrix and the immunoprecipitates were blotted with specific antibodies (bottom panel). g, Sequence alignment of potential PDHE1α PAR-binding motifs and PARylation sites of different species; key residues are shown in red. A schematic of PDHE1α PAR-binding motif (blue) and PARylation site (green) mutations is shown below the alignment. h, Validation of the PDHE1α PAR-binding motif at potential sites predicted by sequence alignment. HeLa cells were transiently transfected with the above-mentioned HA-tagged PDHE1α plasmids harboring PAR-binding site deletion-mutants and immunoprecipitated with a HA antibody for analysis by western blot/dot blot (for PAR) using specific antibodies.
Extended Data Fig. 5 PARylation of PDHE1α by PARP1 is essential for its recruitment to DNA damage sites.
a-b, Western blot showing PDHE1α PARylation and the effect of individal potential PARylation site mutation (a) and combined mutations (b) on chromatin accumulation. PDHE1α-deficient HeLa cells were transfected with PDHE1α WT and a mutant construct, irradiated with 3 Gy IR and different fractions were harvested immediatedly. The cell lysates were subjected to immunoprecipitation using anti-HA agarose and analysed by western blotting. c, Dynamics of PDHE1α accumulation at DNA damage sites monitored by laser micro-irradiation-coupled live-cell imaging of HeLa cells expressing NLS-fused PDHE1α-WT or PDHE1α-6A constructs. GFP signal accumulation intensity at DSB stripes was quantified from three independent replicates (n = 20 for each group), the curve shows the mean ± s.e.m. Scale bars, 5 μm.
Extended Data Fig. 6 PDHE1α PARylation is required for chromatin accessibility after DNA damage.
a, PDHE1α-deficient HeLa cells were reconstituted with PAR-binding site mutated or deleted constructs, and the cells were irradiated with 5 Gy IR and harvested for PDHE1α enzyme activity assay using a commercial assay kit. n = 3 biological replicates were collected. The statistical analyses were performed using a two-tailed student’s t-test, and data shows the mean ± s.d. b, IF staining showing the PARylated PDHE1α is required for pan-Ac signal accumulation on DSB sites. HeLa-PDHE1α-KO cells rescued with NLS-GFP-fused WT and PARylation-defective PDHE1α constructs were laser micro-irradiated and immuno-labeled with γH2AX and pan-Ac antibodies; nuclei were counterstained with DAPI. The pan-Ac intensity at DSBs was quantified (n >30). Scale bars, 5 μm. c, Quantification of γH2AX foci to confirm that similar amounts of DSBs were induced in the WT and all PDHE1α-mutant groups. The data representative of three independent replicates where data were collected from 100 cells per condition. d, MNase sensitivity assay to evaluate chromatin condensation. WT and PARylation-defective-construct-overexpressing PDHE1α-KO cells were treated with or without etoposide for 1 h. The gel image was captured by BioRad ChemiDoc XRS+, and the intensity of each nucleosome was calculated by Image J. e, HeLa cells and PDHE1α-KO cells were irradiated with 3 Gy IR followed by recovery for 1 h. The cellular chromatin fractions were extracted and analyzed by western blotting using antibodies against the indicated proteins. f, Accumulation of RFP-tagged 53BP1 and RPA70 at damage stripes on PDHE1α-deficient cells monitored by laser micro-irradiation-coupled live-cell imaging. RFP signal accumulation intensity at DSB stripes was quantified from three independent experiments (n = 20 cells were collected each group), the curve shows the mean ± s.e.m. Scale bars, 5 μm.
Extended Data Fig. 7 PDHE1α PARylation coordinated with its enzyme activity is required for chromatin accessibility after DNA damage.
a, GFP-tagged enzymatic mutated PDHE1α overexpressing cells monitored by laser micro-irradiation-coupled live-cell imaging. RFP signal accumulation intensity at DSB stripes was quantified from three independent experiments (n = 20 cells were collected each group), the curve shows the mean ± s.e.m. Scale bars, 5 μm. b, Western blot showing that overexpression of PDHE1α PAR-binding defective mutants have no effect on total protein levels of the incidated DSB repair factors in whole cell lysates extracted from HeLa cells. c, PDHE1α-deficient HeLa cells were reconstituted with enzyme-dead constructs and subjected to 5 Gy IR. The cells were then collected for PDHE1α enzyme activity assay using a commercial assay kit. n = 3 biological replicates were collected. The statistical analyses were performed using a two-tailed student’s t-test, and data shows the mean ± s.d. d, Accumulation of GFP-tagged enzymatic mutated PDHE1α at DNA damage sites monitored by laser micro-irradiation-coupled live-cell imaging of HeLa cells. GFP signal accumulation intensity at DSB stripes was quantified from three independent experiments (n = 15, 16, 12 and 9 cells for WT, R302C, K313R and R378H group were collected respectively), the curve shows the mean ± s.e.m. Scale bars, 5 μm. e, Western blot showing that overexpression of PDHE1αenzymatic defective mutants have no effect on total protein levels of the incidated DSB repair factors in whole cell lysates extracted from HeLa cells.
Extended Data Fig. 8 PDHE1α recruited to chromatin facilitates DNA damage repair and maintains genome integrity.
a, Comet assay showing the DSB repair efficiency in WT and PDHE1α-KO HeLa cells treated with etoposide (10 μM). Representative images are shown in the left panel. Relative tail moments of ≥100 cells were quantified using ImageJ. The center lines of the box-and-whisker plots show the medians, box limits indicate the 25th and 75th percentiles and whiskers extend 1.5x the interquartile range from the 25th and 75th percentiles. The median values of each group are listed under the boxplots. Scale bars, 50 μm. b, Representative gating strategy used to analyze DNA repair efficiency (left) and flow cytometry data for the DR-U2OS and EJ5-U2OS reporter assays shown in Fig. 6B. c, IF staining showing the kinetics of γH2AX foci formation and disappearance from WT and PDHE1α-deficient HeLa cells treated with etoposide (10 μM). The Representative images of γH2AX foci are shown (left), and the number of foci (≥100 cells) was quantified (right) from three independent experiments. Scale bars, 5 μm.
Extended Data Fig. 9 NLS-fused, but not NES-fused PDHE1α facilitates DNA damage repair and maintains genome integrity.
a, Immunostaining showing the intracellular distribution of WT/NLS/NES-fused PDHE1α in HeLa cells. The cells were overexpressed with the above constructs and subjected to immunofluorescence using the specific antibody. b, Mitochondrial OXPHOS detection in WT HeLa and PDHE1α-overexpressing cells. Cells were seeded on black-bottom 96 well plate. The cells were treated as indicated and subjected to OCR detection using commercial kit. The data was collected from 8 independent replicates in each condition. c, Comet assay showing the DSB repair efficiency of PDHE1α-KO HeLa cells stably expressing WT, NLS and NES-fused PDHE1α constructs. Cells were treated with 3 Gy IR. Representative images are shown in the left panel. Relative tail moments of ≥100 cells were quantified using ImageJ. The center lines of the box-and-whisker plots show the medians, box limits indicate the 25th and 75th percentiles and whiskers extend 1.5x the interquartile range from the 25th and 75th percentiles. The median values of each group are listed under the boxplots. Scale bars, 50 μm. d, Flow cytometric analysis showing the HR and NHEJ repair efficiency of DR-U2OS and EJ5-U2OS cells transfected with the indicated plasmids. Rescue efficiencies were determined by western blotting (bottom). n = 3 biological replicates, data are mean ± s.d. The statistical analyses of d and e were performed using a two-tailed student’s t-test. e, Chromosome aberration analysis showing the genome stability of PDHE1α-KO HeLa cells stably expressing WT, NLS and NES-fused PDHE1α constructs. Arrowheads denote chromosome breaks. Data in e represents three independent replicates and a total of 60 cells per group were collected and counted, the data shows the mean ± s.d.; Scale bars, 5 μm.
Extended Data Fig. 10 PDHE1α is a critical mediator of cellular resistance to DNA-damaging treatment.
a, Representative images of colony-formation corresponding to Fig. 7c. b, Genotyping of the Pdha1f/f and Pdha1f/f; CMV cre mice. The DNA from mice tail was extracted and subjected to PCR amplification using specific primers. c, Average body weight of mice post-IR (5 Gy). The body weight of each mouse was monitored every 4 days, and the curve was generated from the average weight of 10 mice per group. Data are mean ± s.d. d, The villi heights and average number of crypts per millimeter of the small intestine length were counted and plotted from 10 mice and each mice collected 2 views for analysis. The statistical analyses were performed using a two-tailed student’s t-test, and data shows the mean ± s.d. e, The intensity of indicated DNA damage markers (7K) were quantified. n = 3 biological replicates from the 10 mice was collected and analyzed using a two-tailed student’s t-test, data are mean ± s.d. f, PDHE1α-KO cells stably expressing PAR-binding-defective constructs were inoculated subcutaneously into nude mice. The average volume of each tumor and mouse body weight were monitored at the indicated time-points and used to plot the growth curve. g, PDHE1α-KO cells stably expressing PARylation-defective constructs were inoculated subcutaneously into nude mice, and the tumor site was irradiated every 5 days. The average body weight of each mouse was monitored at the indicated time-points. Data in f and g were collected from 8 mice of each group. h, H-scores of the indicated markers were quantified for three individual tumors collected from the 8 mice in each group. The statistical analyses were performed using a two-tailed student’s t-test, and data shows the mean ± s.d.
Supplementary information
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Zhang, J., Chen, F., Tian, Y. et al. PARylated PDHE1α generates acetyl-CoA for local chromatin acetylation and DNA damage repair. Nat Struct Mol Biol 30, 1719–1734 (2023). https://doi.org/10.1038/s41594-023-01107-3
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DOI: https://doi.org/10.1038/s41594-023-01107-3
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