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Yates L, Tannous E, Morgan R, Burgers P, Zhang X. A DNA damage-induced phosphorylation circuit enhances Mec1 ATR Ddc2 ATRIP recruitment to Replication Protein A. Proc Natl Acad Sci U S A 2023; 120:e2300150120. [PMID: 36996117 PMCID: PMC10083555 DOI: 10.1073/pnas.2300150120] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 02/24/2023] [Indexed: 03/31/2023] Open
Abstract
The cell cycle checkpoint kinase Mec1ATR and its integral partner Ddc2ATRIP are vital for the DNA damage and replication stress response. Mec1-Ddc2 "senses" single-stranded DNA (ssDNA) by being recruited to the ssDNA binding Replication Protein A (RPA) via Ddc2. In this study, we show that a DNA damage-induced phosphorylation circuit modulates checkpoint recruitment and function. We demonstrate that Ddc2-RPA interactions modulate the association between RPA and ssDNA and that Rfa1-phosphorylation aids in the further recruitment of Mec1-Ddc2. We also uncover an underappreciated role for Ddc2 phosphorylation that enhances its recruitment to RPA-ssDNA that is important for the DNA damage checkpoint in yeast. The crystal structure of a phosphorylated Ddc2 peptide in complex with its RPA interaction domain provides molecular details of how checkpoint recruitment is enhanced, which involves Zn2+. Using electron microscopy and structural modeling approaches, we propose that Mec1-Ddc2 complexes can form higher order assemblies with RPA when Ddc2 is phosphorylated. Together, our results provide insight into Mec1 recruitment and suggest that formation of supramolecular complexes of RPA and Mec1-Ddc2, modulated by phosphorylation, would allow for rapid clustering of damage foci to promote checkpoint signaling.
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Affiliation(s)
- Luke A. Yates
- Section of Structural Biology, Department of Infectious Disease, Imperial College London, South Kensington, LondonSW7 2AZ, United Kingdom
| | - Elias A. Tannous
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Saint Louis, MO63110
| | - R. Marc Morgan
- Department of Life Sciences, Centre for Structural Biology, Imperial College London, South Kensington, LondonSW7 2AZ, United Kingdom
| | - Peter M. Burgers
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Saint Louis, MO63110
| | - Xiaodong Zhang
- Section of Structural Biology, Department of Infectious Disease, Imperial College London, South Kensington, LondonSW7 2AZ, United Kingdom
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2
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Sheu YJ, Kawaguchi RK, Gillis J, Stillman B. Prevalent and dynamic binding of the cell cycle checkpoint kinase Rad53 to gene promoters. eLife 2022; 11:84320. [PMID: 36520028 PMCID: PMC9797190 DOI: 10.7554/elife.84320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 11/29/2022] [Indexed: 12/23/2022] Open
Abstract
Replication of the genome must be coordinated with gene transcription and cellular metabolism, especially following replication stress in the presence of limiting deoxyribonucleotides. The Saccharomyces cerevisiae Rad53 (CHEK2 in mammals) checkpoint kinase plays a major role in cellular responses to DNA replication stress. Cell cycle regulated, genome-wide binding of Rad53 to chromatin was examined. Under replication stress, the kinase bound to sites of active DNA replication initiation and fork progression, but unexpectedly to the promoters of about 20% of genes encoding proteins involved in multiple cellular functions. Rad53 promoter binding correlated with changes in expression of a subset of genes. Rad53 promoter binding to certain genes was influenced by sequence-specific transcription factors and less by checkpoint signaling. However, in checkpoint mutants, untimely activation of late-replicating origins reduces the transcription of nearby genes, with concomitant localization of Rad53 to their gene bodies. We suggest that the Rad53 checkpoint kinase coordinates genome-wide replication and transcription under replication stress conditions.
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Affiliation(s)
- Yi-Jun Sheu
- Cold Spring Harbor LaboratoryCold Spring HarborUnited States
| | | | - Jesse Gillis
- Cold Spring Harbor LaboratoryCold Spring HarborUnited States
| | - Bruce Stillman
- Cold Spring Harbor LaboratoryCold Spring HarborUnited States
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Tsai TH, Lieu AS, Huang TY, Kwan AL, Lin CL, Hsu YC. RTA404, an Activator of Nrf2, Activates the Checkpoint Kinases and Induces Apoptosis through Intrinsic Apoptotic Pathway in Malignant Glioma. J Clin Med 2021; 10:4805. [PMID: 34768325 DOI: 10.3390/jcm10214805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/15/2021] [Accepted: 10/15/2021] [Indexed: 01/24/2023] Open
Abstract
Background: Malignant glioma (MG) is an aggressive malignant brain tumor. Despite advances in multidisciplinary treatment, overall survival rates remain low. A trifluoroethyl amide derivative of 2-cyano-3-,12-dioxoolean-1,9-dien-28-oic acid (CDDO), CDDO–trifluoroethyl amide (CDDO–TFEA) is a nuclear erythroid 2-related factor 2/antioxidant response element pathway activator. RTA404 is used to inhibit proliferation and induce apoptosis in cancer cells. However, its effect on tumorigenesis in glioma is unclear. Methods: This in vitro study evaluated the effects of RTA404 on MG cells. We treated U87MG cell lines with RTA404 and performed assessments of apoptosis and cell cycle distributions. DNA content and apoptosis induction were subjected to flow cytometry analysis. The mitotic index was assessed based on MPM-2 expression. Protein expression was analyzed through Western blotting. Results: RTA404 significantly inhibited the cell viability and induced cell apoptosis on the U87MG cell line. The Annexin-FITC/PI assay revealed significant changes in the percentage of apoptotic cells. Treatment with RTA404 led to a significant reduction in the U87MG cells’ mitochondrial membrane potential. A significant rise in the percentage of caspase-3 activity was detected in the treated cells. In addition, these results suggest that cells pass the G2 checkpoint without cell cycle arrest by RTA404 treatment in the MPM-2 staining. An analysis of CHK1, CHK2, and p-CHK2 expression suggested that the DNA damage checkpoint system seems also to be activated by RTA404 treatment in established U87MG cells. Therefore, RTA404 may not only activate the DNA damage checkpoint system, it may also exert apoptosis in established U87MG cells. Conclusions: RTA404 inhibits the cell viability of gliomas and induces cancer cell apoptosis through intrinsic apoptotic pathway in Malignant glioma. In addition, the DNA damage checkpoint system seems also to be activated by RTA404. Taken together, RTA404 activated the DNA damage checkpoint system and induced apoptosis through intrinsic apoptotic pathways in established U87MG cells.
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4
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Kim SM, Forsburg SL. Active Replication Checkpoint Drives Genome Instability in Fission Yeast mcm4 Mutant. Mol Cell Biol 2020; 40:e00033-20. [PMID: 32341083 DOI: 10.1128/MCB.00033-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 04/17/2020] [Indexed: 02/07/2023] Open
Abstract
Upon replication fork arrest, the replication checkpoint kinase Cds1 is stimulated to preserve genome integrity. Robust activation of Cds1 in response to hydroxyurea prevents the endonuclease Mus81 from cleaving the stalled replication fork inappropriately. However, we find that the response is different in temperature-sensitive mcm4 mutants, affecting a subunit of the MCM replicative helicase. We show that Cds1 inhibition of Mus81 promotes genomic instability and allows mcm4-dg cells to evade cell cycle arrest. Cds1 regulation of Mus81 activity also contributes to the formation of the replication stress-induced DNA damage markers replication protein A (RPA) and Ku. These results identify a surprising role for Cds1 in driving DNA damage and disrupted chromosomal segregation under certain conditions of replication stress.
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Gao W, Hu Y, Zhang Z, Du G, Yin L, Yin Z. Knockdown of EIF3C promotes human U-2OS cells apoptosis through increased CASP3/7 and Chk1/2 by upregulating SAPK/JNK. Onco Targets Ther 2019; 12:1225-1235. [PMID: 30863090 PMCID: PMC6389005 DOI: 10.2147/ott.s187209] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Background As a component of the EIF3 complex, EIF3C is essential for several steps in protein synthesis initiation. Recently, it has been addressed that EIF3C is overexpressed in several human cancers and plays a pivotal role in cell proliferation and tumorigenesis. Materials and methods Immunohistochemistry, quantitative real-time PCR (qPCR), and Western blotting assays were employed to determine the expression of EIF3C in osteosarcoma (OsC) tissues obtained from 60 patients. The levels of EIF3C mRNA and protein were assessed by qPCR and Western blotting, respectively. The effect of EIF3C knockdown on OsC cell proliferation was detected by MTT and colony formation assays, respectively. Cell apoptosis induced by EIF3C silencing was analyzed by flow cytometric analysis. PathScan stress and apoptosis signaling antibody array kit was used to analyze the potential effects of EIF3C knockdown on OsC cells. Results The levels of EIF3C were high in OsC tissues and cell lines. In addition, EIF3C knockdown by lentivirus-mediated shRNA targeting EIF3C significantly suppressed cell proliferation and colony formation and induced apoptosis in U-2OS cells. Moreover, EIF3C knockdown led to the upregulated expression of CASP3/7, Chk1/2, and SAPK/JNK, indicating that the downregulated expression of EIF3C might be associated with pro-apoptosis of U-2OS cells. Conclusion EIF3C may be a promising target for gene therapy of human OsC. However, the precise mechanisms behind the effect of EIF3C on OsC tumorigenesis require further analysis.
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Affiliation(s)
- Weilu Gao
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China,
| | - Yong Hu
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China,
| | - Zhengqin Zhang
- Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China
| | - Gongwen Du
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China,
| | - Li Yin
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China,
| | - Zongsheng Yin
- Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China,
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Webster PJ, Littlejohns AT, Gaunt HJ, Young RS, Rode B, Ritchie JE, Stead LF, Harrison S, Droop A, Martin HL, Tomlinson DC, Hyman AJ, Appleby HL, Boxall S, Bruns AF, Li J, Prasad RK, Lodge JPA, Burke DA, Beech DJ. Upregulated WEE1 protects endothelial cells of colorectal cancer liver metastases. Oncotarget 2018; 8:42288-42299. [PMID: 28178688 PMCID: PMC5522067 DOI: 10.18632/oncotarget.15039] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 01/09/2017] [Indexed: 12/26/2022] Open
Abstract
Surgical resection of colorectal cancer liver metastases (CLM) can be curative, yet 80% of patients are unsuitable for this treatment. As angiogenesis is a determinant of CLM progression we isolated endothelial cells from CLM and sought a mechanism which is upregulated, essential for angiogenic properties of these cells and relevant to emerging therapeutic options. Matched CLM endothelial cells (CLMECs) and endothelial cells of normal adjacent liver (LiECs) were superficially similar but transcriptome sequencing revealed molecular differences, one of which was unexpected upregulation and functional significance of the checkpoint kinase WEE1. Western blotting confirmed that WEE1 protein was upregulated in CLMECs. Knockdown of WEE1 by targeted short interfering RNA or the WEE1 inhibitor AZD1775 suppressed proliferation and migration of CLMECs. Investigation of the underlying mechanism suggested induction of double-stranded DNA breaks due to nucleotide shortage which then led to caspase 3-dependent apoptosis. The implication for CLMEC tube formation was striking with AZD1775 inhibiting tube branch points by 83%. WEE1 inhibitors might therefore be a therapeutic option for CLM and could be considered more broadly as anti-angiogenic agents in cancer treatment.
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Affiliation(s)
| | | | - Hannah J Gaunt
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | | | - Baptiste Rode
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | | | - Lucy F Stead
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Sally Harrison
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Alastair Droop
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK.,MRC Medical Bioinformatics Centre, University of Leeds, Leeds LS2 9NL, UK
| | - Heather L Martin
- School of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | | | - Adam J Hyman
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | | | - Sally Boxall
- School of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | | | - Jing Li
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Raj K Prasad
- Department of Hepatobiliary and Transplant Surgery, St. James's University Hospital, Leeds LS9 7TF, UK
| | - J Peter A Lodge
- Department of Hepatobiliary and Transplant Surgery, St. James's University Hospital, Leeds LS9 7TF, UK
| | - Dermot A Burke
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK.,Department of Colorectal Surgery, St. James's University Hospital, Leeds LS9 7TF, UK
| | - David J Beech
- School of Medicine, University of Leeds, Leeds LS2 9JT, UK
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7
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Liu S, Liu Y, Minami K, Chen A, Wan Q, Yin Y, Gan L, Xu A, Matsuura N, Koizumi M, Liu Y, Na S, Li J, Nakshatri H, Li BY, Yokota H. Inhibiting checkpoint kinase 1 protects bone from bone resorption by mammary tumor in a mouse model. Oncotarget 2018; 9:9364-9378. [PMID: 29507695 PMCID: PMC5823640 DOI: 10.18632/oncotarget.24286] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 01/13/2018] [Indexed: 12/22/2022] Open
Abstract
DNA damage response plays a critical role in tumor growth, but little is known about its potential role in bone metabolism. We employed selective inhibitors of Chk1 and examined their effects on the proliferation and migration of mammary tumor cells as well as the development of osteoblasts and osteoclasts. Further, using a mouse model of bone metastasis we evaluated the effects of Chk1 inhibitors on bone quality. Chk1 inhibitors blocked the proliferation, survival, and migration of tumor cells in vitro and suppressed the development of bone-resorbing osteoclasts by downregulating NFATc1. In the mouse model, Chk1 inhibitor reduced osteolytic lesions and prevented mechanical weakening of the femur and tibia. Analysis of RNA-seq expression data indicated that the observed effects were mediated through the regulation of eukaryotic translation initiation factor 2 alpha, stress to the endoplasmic reticulum, S100 proteins, and bone remodeling-linked genes. Our findings suggest that targeting Chk1 signaling without adding DNA damaging agents may protect bone from degradation while suppressing tumor growth and migration.
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Affiliation(s)
- Shengzhi Liu
- Department of Pharmacology, School of Pharmacy, Harbin Medical University, Harbin 150081, China.,Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Yang Liu
- Department of Pharmacology, School of Pharmacy, Harbin Medical University, Harbin 150081, China.,Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Kazumasa Minami
- Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA.,Department of Medical Physics and Engineering, Osaka University Graduate School of Medicine Suita, Osaka 565-0871, Japan
| | - Andy Chen
- Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Qiaoqiao Wan
- Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Yukun Yin
- Department of Biology, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Liangying Gan
- Department of Biology, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Aihua Xu
- Department of Biology, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Nariaki Matsuura
- Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka 537-8511, Japan
| | - Masahiko Koizumi
- Department of Medical Physics and Engineering, Osaka University Graduate School of Medicine Suita, Osaka 565-0871, Japan
| | - Yunlong Liu
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Sungsoo Na
- Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Jiliang Li
- Department of Biology, Indiana University at Purdue University, Indianapolis, IN 46202, USA
| | - Harikrishna Nakshatri
- Department of Surgery, Simon Cancer Research Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Bai-Yan Li
- Department of Pharmacology, School of Pharmacy, Harbin Medical University, Harbin 150081, China
| | - Hiroki Yokota
- Department of Biomedical Engineering, Indiana University at Purdue University, Indianapolis, IN 46202, USA
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8
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Webster PJ, Littlejohns AT, Gaunt HJ, Prasad KR, Beech DJ, Burke DA. AZD1775 induces toxicity through double-stranded DNA breaks independently of chemotherapeutic agents in p53-mutated colorectal cancer cells. Cell Cycle 2017; 16:2176-2182. [PMID: 28296564 PMCID: PMC5736347 DOI: 10.1080/15384101.2017.1301329] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AZD1775 is a small molecule WEE1 inhibitor used in combination with DNA-damaging agents to cause premature mitosis and cell death in p53-mutated cancer cells. Here we sought to determine the mechanism of action of AZD1775 in combination with chemotherapeutic agents in light of recent findings that AZD1775 can cause double-stranded DNA (DS-DNA) breaks. AZD1775 significantly improved the cytotoxicity of 5-FU in a p53-mutated colorectal cancer cell line (HT29 cells), decreasing the IC50 from 9.3 μM to 3.5 μM. Flow cytometry showed a significant increase in the mitotic marker pHH3 (3.4% vs. 56.2%) and DS-DNA break marker γH2AX (5.1% vs. 50.7%) for combination therapy compared with 5-FU alone. Combination therapy also increased the amount of caspase-3 dependent apoptosis compared with 5-FU alone (4% vs. 13%). The addition of exogenous nucleosides to combination therapy significantly rescued the increased DS-DNA breaks and caspase-3 dependent apoptosis almost to the levels of 5-FU monotherapy. In conclusion, AZD1775 enhances 5-FU cytotoxicity through increased DS-DNA breaks, not premature mitosis, in p53-mutated colorectal cancer cells. This finding is important for designers of future clinical trials when considering the optimal timing and duration of AZD1775 treatment.
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Affiliation(s)
| | | | | | - K Raj Prasad
- b Department of Hepatobiliary and Transplant Surgery , St. James's University Hospital , Leeds , UK
| | | | - Dermot Anthony Burke
- a School of Medicine, University of Leeds , Leeds , UK.,c Department of Colorectal Surgery , St. James's University Hospital , Leeds , UK
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Deshpande I, Seeber A, Shimada K, Keusch JJ, Gut H, Gasser SM. Structural Basis of Mec1-Ddc2-RPA Assembly and Activation on Single-Stranded DNA at Sites of Damage. Mol Cell 2017; 68:431-445.e5. [PMID: 29033322 DOI: 10.1016/j.molcel.2017.09.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 08/18/2017] [Accepted: 09/14/2017] [Indexed: 10/18/2022]
Abstract
Mec1-Ddc2 (ATR-ATRIP) is a key DNA-damage-sensing kinase that is recruited through the single-stranded (ss) DNA-binding replication protein A (RPA) to initiate the DNA damage checkpoint response. Activation of ATR-ATRIP in the absence of DNA damage is lethal. Therefore, it is important that damage-specific recruitment precedes kinase activation, which is achieved at least in part by Mec1-Ddc2 homodimerization. Here, we report a structural, biochemical, and functional characterization of the yeast Mec1-Ddc2-RPA assembly. High-resolution co-crystal structures of Ddc2-Rfa1 and Ddc2-Rfa1-t11 (K45E mutant) N termini and of the Ddc2 coiled-coil domain (CCD) provide insight into Mec1-Ddc2 homodimerization and damage-site targeting. Based on our structural and functional findings, we present a Mec1-Ddc2-RPA-ssDNA composite structural model. By way of validation, we show that RPA-dependent recruitment of Mec1-Ddc2 is crucial for maintaining its homodimeric state at ssDNA and that Ddc2's recruitment domain and CCD are important for Mec1-dependent survival of UV-light-induced DNA damage.
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Affiliation(s)
- Ishan Deshpande
- Friedrich Miescher Institute for Biomedical Research (FMI), Maulbeerstrasse 66, 4058 Basel, Switzerland; University of Basel, Faculty of Natural Sciences, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Andrew Seeber
- Friedrich Miescher Institute for Biomedical Research (FMI), Maulbeerstrasse 66, 4058 Basel, Switzerland
| | - Kenji Shimada
- Friedrich Miescher Institute for Biomedical Research (FMI), Maulbeerstrasse 66, 4058 Basel, Switzerland
| | - Jeremy J Keusch
- Friedrich Miescher Institute for Biomedical Research (FMI), Maulbeerstrasse 66, 4058 Basel, Switzerland
| | - Heinz Gut
- Friedrich Miescher Institute for Biomedical Research (FMI), Maulbeerstrasse 66, 4058 Basel, Switzerland
| | - Susan M Gasser
- Friedrich Miescher Institute for Biomedical Research (FMI), Maulbeerstrasse 66, 4058 Basel, Switzerland; University of Basel, Faculty of Natural Sciences, Klingelbergstrasse 50, 4056 Basel, Switzerland.
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10
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Lindsey-Boltz LA, Kemp MG, Capp C, Sancar A. RHINO forms a stoichiometric complex with the 9-1-1 checkpoint clamp and mediates ATR-Chk1 signaling. Cell Cycle 2015; 14:99-108. [PMID: 25602520 DOI: 10.4161/15384101.2014.967076] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The ATR-Chk1 signaling pathway mediates cellular responses to DNA damage and replication stress and is composed of a number of core factors that are conserved throughout eukaryotic organisms. However, humans and other higher eukaryotic species possess additional factors that are implicated in the regulation of this signaling network but that have not been extensively studied. Here we show that RHINO (for Rad9, Rad1, Hus1 interacting nuclear orphan) forms complexes with both the 9-1-1 checkpoint clamp and TopBP1 in human cells even in the absence of treatments with DNA damaging agents via direct interactions with the Rad9 and Rad1 subunits of the 9-1-1 checkpoint clamp and with the ATR kinase activator TopBP1. The interaction of RHINO with 9-1-1 was of sufficient affinity to allow for the purification of a stable heterotetrameric RHINO-Rad9-Hus1-Rad1 complex in vitro. In human cells, a portion of RHINO localizes to chromatin in the absence of DNA damage, and this association is enriched following UV irradiation. Furthermore, we find that the tethering of a Lac Repressor (LacR)-RHINO fusion protein to LacO repeats in chromatin of mammalian cells induces Chk1 phosphorylation in a Rad9- and Claspin-dependent manner. Lastly, the loss of RHINO partially abrogates ATR-Chk1 signaling following UV irradiation without impacting the interaction of the 9-1-1 clamp with TopBP1 or the loading of 9-1-1 onto chromatin. We conclude that RHINO is a bona fide regulator of ATR-Chk1 signaling in mammalian cells.
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Key Words
- 9-1-1, Rad9-Hus1-Rad1
- ATR, Ataxia telangiectasia-mutated and Rad3-related
- DNA damage checkpoint
- DNA damage response
- IP, immunoprecipitation
- RHINO, Rad9, Hus1, Rad1 interacting nuclear orphan
- RPA, Replication Protein A
- TopBP1, Topoisomerase binding protein 1
- UV, ultraviolet
- checkpoint clamp
- checkpoint kinase
- chromatin
- protein-protein interaction
- ssDNA, single-stranded DNA
- ultraviolet light
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Affiliation(s)
- Laura A Lindsey-Boltz
- a From the Department of Biochemistry and Biophysics ; University of North Carolina School of Medicine ; Chapel Hill , NC USA
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11
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Balint A, Kim T, Gallo D, Cussiol JR, Bastos de Oliveira FM, Yimit A, Ou J, Nakato R, Gurevich A, Shirahige K, Smolka MB, Zhang Z, Brown GW. Assembly of Slx4 signaling complexes behind DNA replication forks. EMBO J 2015; 34:2182-97. [PMID: 26113155 DOI: 10.15252/embj.201591190] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 06/02/2015] [Indexed: 12/30/2022] Open
Abstract
Obstructions to replication fork progression, referred to collectively as DNA replication stress, challenge genome stability. In Saccharomyces cerevisiae, cells lacking RTT107 or SLX4 show genome instability and sensitivity to DNA replication stress and are defective in the completion of DNA replication during recovery from replication stress. We demonstrate that Slx4 is recruited to chromatin behind stressed replication forks, in a region that is spatially distinct from that occupied by the replication machinery. Slx4 complex formation is nucleated by Mec1 phosphorylation of histone H2A, which is recognized by the constitutive Slx4 binding partner Rtt107. Slx4 is essential for recruiting the Mec1 activator Dpb11 behind stressed replication forks, and Slx4 complexes are important for full activity of Mec1. We propose that Slx4 complexes promote robust checkpoint signaling by Mec1 by stably recruiting Dpb11 within a discrete domain behind the replication fork, during DNA replication stress.
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Affiliation(s)
- Attila Balint
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - TaeHyung Kim
- Donnelly Centre, University of Toronto, Toronto, ON, Canada Department of Computer Science, University of Toronto, Toronto, ON, Canada
| | - David Gallo
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Jose Renato Cussiol
- Department of Molecular Biology and Genetics and Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY, USA
| | - Francisco M Bastos de Oliveira
- Department of Molecular Biology and Genetics and Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY, USA
| | - Askar Yimit
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Jiongwen Ou
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Ryuichiro Nakato
- Institute of Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, University of Tokyo, Tokyo, Japan
| | - Alexey Gurevich
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada Donnelly Centre, University of Toronto, Toronto, ON, Canada
| | - Katsuhiko Shirahige
- Institute of Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, University of Tokyo, Tokyo, Japan
| | - Marcus B Smolka
- Department of Molecular Biology and Genetics and Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY, USA
| | - Zhaolei Zhang
- Donnelly Centre, University of Toronto, Toronto, ON, Canada Department of Computer Science, University of Toronto, Toronto, ON, Canada
| | - Grant W Brown
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada Donnelly Centre, University of Toronto, Toronto, ON, Canada
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Yuan Z, Guo W, Yang J, Li L, Wang M, Lei Y, Wan Y, Zhao X, Luo N, Cheng P, Liu X, Nie C, Peng Y, Tong A, Wei Y. PNAS-4, an Early DNA Damage Response Gene, Induces S Phase Arrest and Apoptosis by Activating Checkpoint Kinases in Lung Cancer Cells. J Biol Chem 2015; 290:14927-44. [PMID: 25918161 DOI: 10.1074/jbc.m115.658419] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Indexed: 02/05/2023] Open
Abstract
PNAS-4, a novel pro-apoptotic gene, was activated during the early response to DNA damage. Our previous study has shown that PNAS-4 induces S phase arrest and apoptosis when overexpressed in A549 lung cancer cells. However, the underlying action mechanism remains far from clear. In this work, we found that PNAS-4 expression in lung tumor tissues is significantly lower than that in adjacent lung tissues; its expression is significantly increased in A549 cells after exposure to cisplatin, methyl methane sulfonate, and mitomycin; and its overexpression induces S phase arrest and apoptosis in A549 (p53 WT), NCI-H460 (p53 WT), H526 (p53 mutation), and Calu-1 (p53(-/-)) lung cancer cells, leading to proliferation inhibition irrespective of their p53 status. The S phase arrest is associated with up-regulation of p21(Waf1/Cip1) and inhibition of the Cdc25A-CDK2-cyclin E/A pathway. Up-regulation of p21(Waf1/Cip1) is p53-independent and correlates with activation of ERK. We further showed that the intra-S phase checkpoint, which occurs via DNA-dependent protein kinase-mediated activation of Chk1 and Chk2, is involved in the S phase arrest and apoptosis. Gene silencing of Chk1/2 rescues, whereas that of ATM or ATR does not affect, S phase arrest and apoptosis. Furthermore, human PNAS-4 induces DNA breaks in comet assays and γ-H2AX staining. Intriguingly, caspase-dependent cleavage of Chk1 has an additional role in enhancing apoptosis. Taken together, our findings suggest a novel mechanism by which elevated PNAS-4 first causes DNA-dependent protein kinase-mediated Chk1/2 activation and then results in inhibition of the Cdc25A-CDK2-cyclin E/A pathway, ultimately causing S phase arrest and apoptosis in lung cancer cells.
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Affiliation(s)
- Zhu Yuan
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China,
| | - Wenhao Guo
- the Department of Abdominal Oncology, Cancer Center and State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University, No. 37, Guoxue Road, Chengdu 610041, Sichuan Province, China, and
| | - Jun Yang
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Lei Li
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Meiliang Wang
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Yi Lei
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Yang Wan
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Xinyu Zhao
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Na Luo
- the Nankai University School of Medicine/Collaborative Innovation Center of Biotherapy, Tianjin 300071, China
| | - Ping Cheng
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Xinyu Liu
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Chunlai Nie
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Yong Peng
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
| | - Aiping Tong
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China,
| | - Yuquan Wei
- From the State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University/Collaborative Innovation Center of Biotherapy, West China Hospital, Sichuan University, 17 People's South Road, Chengdu 610041, China
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