1
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Passaretti P, Cvetkovic MA, Costa A, Gambus A. Protocol for the purification of replisomes from the Xenopus laevis egg extract system for single-particle cryo-EM analysis. STAR Protoc 2024; 5:103237. [PMID: 39126657 DOI: 10.1016/j.xpro.2024.103237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 06/25/2024] [Accepted: 07/11/2024] [Indexed: 08/12/2024] Open
Abstract
Here, we present a large-scale FLAG immunoprecipitation protocol to isolate large protein complexes driving DNA replication at replicating chromatin assembled in Xenopus laevis egg extract. We describe how to prepare demembranated sperm nuclei (DNA) and low-speed supernatant egg extract (LSS) and present detailed procedures for sample preparation and application onto grids for negative stain electron microscopy (NS-EM) and cryoelectron microscopy (cryo-EM). For complete details on the use and execution of this protocol, please refer to Cvetkovic et al.1.
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Affiliation(s)
- Paolo Passaretti
- Institute of Cancer and Genomic Sciences, Birmingham Centre for Genome Biology, University of Birmingham, B15 2TT Birmingham, UK
| | - Milos A Cvetkovic
- Macromolecular Machines Laboratory, The Francis Crick Institute, NW1 1AT London, UK
| | - Alessandro Costa
- Macromolecular Machines Laboratory, The Francis Crick Institute, NW1 1AT London, UK
| | - Agnieszka Gambus
- Institute of Cancer and Genomic Sciences, Birmingham Centre for Genome Biology, University of Birmingham, B15 2TT Birmingham, UK.
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2
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Alcón P, Kaczmarczyk AP, Ray KK, Liolios T, Guilbaud G, Sijacki T, Shen Y, McLaughlin SH, Sale JE, Knipscheer P, Rueda DS, Passmore LA. FANCD2-FANCI surveys DNA and recognizes double- to single-stranded junctions. Nature 2024:10.1038/s41586-024-07770-w. [PMID: 39085614 DOI: 10.1038/s41586-024-07770-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 07/01/2024] [Indexed: 08/02/2024]
Abstract
DNA crosslinks block DNA replication and are repaired by the Fanconi anaemia pathway. The FANCD2-FANCI (D2-I) protein complex is central to this process as it initiates repair by coordinating DNA incisions around the lesion1. However, D2-I is also known to have a more general role in DNA repair and in protecting stalled replication forks from unscheduled degradation2-4. At present, it is unclear how DNA crosslinks are recognized and how D2-I functions in replication fork protection. Here, using single-molecule imaging, we show that D2-I is a sliding clamp that binds to and diffuses on double-stranded DNA. Notably, sliding D2-I stalls on encountering single-stranded-double-stranded (ss-ds) DNA junctions, structures that are generated when replication forks stall at DNA lesions5. Using cryogenic electron microscopy, we determined structures of D2-I on DNA that show that stalled D2-I makes specific interactions with the ss-dsDNA junction that are distinct from those made by sliding D2-I. Thus, D2-I surveys dsDNA and, when it reaches an ssDNA gap, it specifically clamps onto ss-dsDNA junctions. Because ss-dsDNA junctions are found at stalled replication forks, D2-I can identify sites of DNA damage. Therefore, our data provide a unified molecular mechanism that reconciles the roles of D2-I in the recognition and protection of stalled replication forks in several DNA repair pathways.
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Affiliation(s)
- Pablo Alcón
- MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Artur P Kaczmarczyk
- Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, UK
- MRC Laboratory of Medical Sciences, London, UK
| | - Korak Kumar Ray
- Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, UK
- MRC Laboratory of Medical Sciences, London, UK
| | - Themistoklis Liolios
- Oncode Institute, Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | | | | | - Yichao Shen
- MRC Laboratory of Molecular Biology, Cambridge, UK
| | | | | | - Puck Knipscheer
- Oncode Institute, Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | - David S Rueda
- Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, UK.
- MRC Laboratory of Medical Sciences, London, UK.
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3
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Terui R, Berger SE, Sambel LA, Song D, Chistol G. Single-molecule imaging reveals the mechanism of bidirectional replication initiation in metazoa. Cell 2024; 187:3992-4009.e25. [PMID: 38866019 PMCID: PMC11283366 DOI: 10.1016/j.cell.2024.05.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 03/28/2024] [Accepted: 05/13/2024] [Indexed: 06/14/2024]
Abstract
Metazoan genomes are copied bidirectionally from thousands of replication origins. Replication initiation entails the assembly and activation of two CMG helicases (Cdc45⋅Mcm2-7⋅GINS) at each origin. This requires several replication firing factors (including TopBP1, RecQL4, and DONSON) whose exact roles are still under debate. How two helicases are correctly assembled and activated at each origin is a long-standing question. By visualizing the recruitment of GINS, Cdc45, TopBP1, RecQL4, and DONSON in real time, we uncovered that replication initiation is surprisingly dynamic. First, TopBP1 transiently binds to the origin and dissociates before the start of DNA synthesis. Second, two Cdc45 are recruited together, even though Cdc45 alone cannot dimerize. Next, two copies of DONSON and two GINS simultaneously arrive at the origin, completing the assembly of two CMG helicases. Finally, RecQL4 is recruited to the CMG⋅DONSON⋅DONSON⋅CMG complex and promotes DONSON dissociation and CMG activation via its ATPase activity.
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Affiliation(s)
- Riki Terui
- Chemical and Systems Biology Department, Stanford School of Medicine, Stanford, CA 94305, USA
| | - Scott E Berger
- Biophysics Program, Stanford School of Medicine, Stanford, CA 94305, USA
| | - Larissa A Sambel
- Chemical and Systems Biology Department, Stanford School of Medicine, Stanford, CA 94305, USA
| | - Dan Song
- Chemical and Systems Biology Department, Stanford School of Medicine, Stanford, CA 94305, USA
| | - Gheorghe Chistol
- Chemical and Systems Biology Department, Stanford School of Medicine, Stanford, CA 94305, USA; Biophysics Program, Stanford School of Medicine, Stanford, CA 94305, USA; Cancer Biology Program, Stanford School of Medicine, Stanford, CA 94305, USA; Stanford Cancer Institute, Stanford School of Medicine, Stanford, CA 94305, USA; BioX Interdisciplinary Institute, Stanford School of Medicine, Stanford, CA 94305, USA.
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4
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Mevissen TE, Kümmecke M, Schmid EW, Farnung L, Walter JC. STK19 positions TFIIH for cell-free transcription-coupled DNA repair. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.22.604623. [PMID: 39091863 PMCID: PMC11291053 DOI: 10.1101/2024.07.22.604623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
In transcription-coupled repair, stalled RNA polymerase II (Pol II) is recognized by CSB and CRL4CSA, which co-operate with UVSSSA and ELOF1 to recruit TFIIH for nucleotide excision repair (TC-NER). To explore the mechanism of TC-NER, we recapitulated this reaction in vitro. When a plasmid containing a site-specific lesion is transcribed in frog egg extract, error-free repair is observed that depends on CSB, CRL4CSA, UVSSA, and ELOF1. Repair also depends on STK19, a factor previously implicated in transcription recovery after UV exposure. A 1.9 Å cryo-electron microscopy structure shows that STK19 joins the TC-NER complex by binding CSA and the RPB1 subunit of Pol II. Furthermore, AlphaFold predicts that STK19 interacts with the XPD subunit of TFIIH, and disrupting this interface impairs cell-free repair. Molecular modeling suggests that STK19 positions TFIIH ahead of Pol II for lesion verification. In summary, our analysis of cell-free TC-NER suggests that STK19 couples RNA polymerase II stalling to downstream repair events.
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Affiliation(s)
- Tycho E.T. Mevissen
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
- Howard Hughes Medical Institute
| | - Maximilian Kümmecke
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Ernst W. Schmid
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Lucas Farnung
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Johannes C. Walter
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
- Howard Hughes Medical Institute
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5
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Vontalge EJ, Kavlashvili T, Dahmen SN, Cranford MT, Dewar JM. Control of DNA replication in vitro using a reversible replication barrier. Nat Protoc 2024; 19:1940-1983. [PMID: 38594502 PMCID: PMC11230854 DOI: 10.1038/s41596-024-00977-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 01/19/2024] [Indexed: 04/11/2024]
Abstract
A major obstacle to studying DNA replication is that it involves asynchronous and highly delocalized events. A reversible replication barrier overcomes this limitation and allows replication fork movement to be synchronized and localized, facilitating the study of replication fork function and replication coupled repair. Here we provide details on establishing a reversible replication barrier in vitro and using it to monitor different aspects of DNA replication. DNA template containing an array of lac operator (lacO) sequences is first bound to purified lac repressor (LacR). This substrate is then replicated in vitro using a biochemical replication system, which results in replication forks stalled on either side of the LacR array regardless of when or where they arise. Once replication forks are synchronized at the barrier, isopropyl-β-D-thiogalactopyranoside can be added to disrupt LacR binding so that replication forks synchronously resume synthesis. We describe how this approach can be employed to control replication fork elongation, termination, stalling and uncoupling, as well as assays that can be used to monitor these processes. We also explain how this approach can be adapted to control whether replication forks encounter a DNA lesion on the leading or lagging strand template and whether a converging fork is present. The required reagents can be prepared in 1-2 weeks and experiments using this approach are typically performed over 1-3 d. The main requirements for utilizing the LacR replication barrier are basic biochemical expertise and access to an in vitro system to study DNA replication. Investigators should also be trained in working with radioactive materials.
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Affiliation(s)
- Emma J Vontalge
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Tamar Kavlashvili
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Steven N Dahmen
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Matthew T Cranford
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - James M Dewar
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA.
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6
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Mirsanaye AS, Hoffmann S, Weisser M, Mund A, Lopez Mendez B, Typas D, van den Boom J, Benedict B, Hendriks IA, Nielsen ML, Meyer H, Duxin JP, Montoya G, Mailand N. VCF1 is a p97/VCP cofactor promoting recognition of ubiquitylated p97-UFD1-NPL4 substrates. Nat Commun 2024; 15:2459. [PMID: 38503733 PMCID: PMC10950897 DOI: 10.1038/s41467-024-46760-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 03/07/2024] [Indexed: 03/21/2024] Open
Abstract
The hexameric AAA+ ATPase p97/VCP functions as an essential mediator of ubiquitin-dependent cellular processes, extracting ubiquitylated proteins from macromolecular complexes or membranes by catalyzing their unfolding. p97 is directed to ubiquitylated client proteins via multiple cofactors, most of which interact with the p97 N-domain. Here, we discover that FAM104A, a protein of unknown function also named VCF1 (VCP/p97 nuclear Cofactor Family member 1), acts as a p97 cofactor in human cells. Detailed structure-function studies reveal that VCF1 directly binds p97 via a conserved α-helical motif that recognizes the p97 N-domain with unusually high affinity, exceeding that of other cofactors. We show that VCF1 engages in joint p97 complex formation with the heterodimeric primary p97 cofactor UFD1-NPL4 and promotes p97-UFD1-NPL4-dependent proteasomal degradation of ubiquitylated substrates in cells. Mechanistically, VCF1 indirectly stimulates UFD1-NPL4 interactions with ubiquitin conjugates via its binding to p97 but has no intrinsic affinity for ubiquitin. Collectively, our findings establish VCF1 as an unconventional p97 cofactor that promotes p97-dependent protein turnover by facilitating p97-UFD1-NPL4 recruitment to ubiquitylated targets.
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Affiliation(s)
- Ann Schirin Mirsanaye
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Saskia Hoffmann
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Melanie Weisser
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Andreas Mund
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Blanca Lopez Mendez
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Dimitris Typas
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Johannes van den Boom
- Molecular Biology I, Faculty of Biology, University of Duisburg-Essen, 45117, Essen, Germany
| | - Bente Benedict
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Ivo A Hendriks
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Michael Lund Nielsen
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Hemmo Meyer
- Molecular Biology I, Faculty of Biology, University of Duisburg-Essen, 45117, Essen, Germany
| | - Julien P Duxin
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Guillermo Montoya
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark
| | - Niels Mailand
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, DK-2200, Copenhagen, Denmark.
- Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, DK-2200, Copenhagen, Denmark.
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7
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Altshuller M, He X, MacKrell EJ, Wernke KM, Wong JWH, Sellés-Baiget S, Wang TY, Chou TF, Duxin JP, Balskus EP, Herzon SB, Semlow DR. The Fanconi anemia pathway repairs colibactin-induced DNA interstrand cross-links. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.30.576698. [PMID: 38352618 PMCID: PMC10862771 DOI: 10.1101/2024.01.30.576698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Colibactin is a secondary metabolite produced by bacteria present in the human gut and is implicated in the progression of colorectal cancer and inflammatory bowel disease. This genotoxin alkylates deoxyadenosines on opposite strands of host cell DNA to produce DNA interstrand cross-links (ICLs) that block DNA replication. While cells have evolved multiple mechanisms to resolve ("unhook") ICLs encountered by the replication machinery, little is known about which of these pathways promote resistance to colibactin-induced ICLs. Here, we use Xenopus egg extracts to investigate replication-coupled repair of plasmids engineered to contain site-specific colibactin-ICLs. We show that replication fork stalling at a colibactin-ICL leads to replisome disassembly and activation of the Fanconi anemia ICL repair pathway, which unhooks the colibactin-ICL through nucleolytic incisions. These incisions generate a DNA double-strand break intermediate in one sister chromatid, which can be repaired by homologous recombination, and a monoadduct ("ICL remnant") in the other. Our data indicate that translesion synthesis past the colibactin-ICL remnant depends on Polη and a Polκ-REV1-Polζ polymerase complex. Although translesion synthesis past colibactin-induced DNA damage is frequently error-free, it can introduce T>N point mutations that partially recapitulate the mutation signature associated with colibactin exposure in vivo. Taken together, our work provides a biochemical framework for understanding how cells tolerate a naturally-occurring and clinically-relevant ICL.
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Affiliation(s)
- Maria Altshuller
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Xu He
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Elliot J. MacKrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Kevin M. Wernke
- Department of Chemistry, Yale University, New Haven, CT, USA
| | - Joel W. H. Wong
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
| | - Selene Sellés-Baiget
- TheNovo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ting-Yu Wang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
- Proteome Exploration Laboratory, Beckman Institute, California Institute of Technology, Pasadena, CA, USA
| | - Tsui-Fen Chou
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
- Proteome Exploration Laboratory, Beckman Institute, California Institute of Technology, Pasadena, CA, USA
| | - Julien P. Duxin
- TheNovo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Emily P. Balskus
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA
- Howard Hughes Medical Institute, Harvard University, Cambridge, MA, USA
| | - Seth B. Herzon
- Department of Chemistry, Yale University, New Haven, CT, USA
| | - Daniel R. Semlow
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
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8
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Ghouil R, Miron S, Sato K, Ristic D, van Rossum-Fikkert SE, Legrand P, Ouldali M, Winter JM, Ropars V, David G, Arteni AA, Wyman C, Knipscheer P, Kanaar R, Zelensky AN, Zinn-Justin S. BRCA2-HSF2BP oligomeric ring disassembly by BRME1 promotes homologous recombination. SCIENCE ADVANCES 2023; 9:eadi7352. [PMID: 37889963 PMCID: PMC10610910 DOI: 10.1126/sciadv.adi7352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 09/20/2023] [Indexed: 10/29/2023]
Abstract
In meiotic homologous recombination (HR), BRCA2 facilitates loading of the recombinases RAD51 and DMC1 at the sites of double-strand breaks (DSBs). The HSF2BP-BRME1 complex interacts with BRCA2. Its absence causes a severe reduction in recombinase loading at meiotic DSB. We previously showed that, in somatic cancer cells ectopically producing HSF2BP, DNA damage can trigger HSF2BP-dependent degradation of BRCA2, which prevents HR. Here, we report that, upon binding to BRCA2, HSF2BP forms octameric rings that are able to interlock into a large ring-shaped 24-mer. Addition of BRME1 leads to dissociation of both of these ring structures and cancels the disruptive effect of HSF2BP on cancer cell resistance to DNA damage. It also prevents BRCA2 degradation during interstrand DNA crosslink repair in Xenopus egg extracts. We propose that, during meiosis, the control of HSF2BPBRCA2 oligomerization by BRME1 ensures timely assembly of the ring complex that concentrates BRCA2 and controls its turnover, thus promoting HR.
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Affiliation(s)
- Rania Ghouil
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Simona Miron
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Koichi Sato
- Oncode Institute, Hubrecht Institute–KNAW and University Medical Center Utrecht, Utrecht, Netherlands
| | - Dejan Ristic
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, Netherlands
| | - Sari E. van Rossum-Fikkert
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, Netherlands
| | - Pierre Legrand
- Synchrotron SOLEIL, HelioBio group, L’Orme des Merisiers, Gif sur-Yvette, France
| | - Malika Ouldali
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | | | - Virginie Ropars
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Gabriel David
- Synchrotron SOLEIL, HelioBio group, L’Orme des Merisiers, Gif sur-Yvette, France
| | - Ana-Andreea Arteni
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Claire Wyman
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, Netherlands
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, Netherlands
| | - Puck Knipscheer
- Oncode Institute, Hubrecht Institute–KNAW and University Medical Center Utrecht, Utrecht, Netherlands
- Department of Human Genetics, Leiden University Medical Center, Leiden, Netherlands
| | - Roland Kanaar
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, Netherlands
| | - Alex N. Zelensky
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, Netherlands
| | - Sophie Zinn-Justin
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
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9
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Berger S, Chistol G. Visualizing the dynamics of DNA replication and repair at the single-molecule level. Methods Cell Biol 2023; 182:109-165. [PMID: 38359974 PMCID: PMC11246157 DOI: 10.1016/bs.mcb.2023.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
During cell division, the genome of each eukaryotic cell is copied by thousands of replisomes-large protein complexes consisting of several dozen proteins. Recent studies suggest that the eukaryotic replisome is much more dynamic than previously thought. To directly visualize replisome dynamics in a physiological context, we recently developed a single-molecule approach for imaging replication proteins in Xenopus egg extracts. These extracts contain all the soluble nuclear proteins and faithfully recapitulate DNA replication and repair in vitro, serving as a powerful platform for studying the mechanisms of genome maintenance. Here we present detailed protocols for conducting single-molecule experiments in nuclear egg extracts and preparing key reagents. This workflow can be easily adapted to visualize the dynamics and function of other proteins implicated in DNA replication and repair.
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Affiliation(s)
- Scott Berger
- Biophysics Program, Stanford School of Medicine, Stanford, CA, United States
| | - Gheorghe Chistol
- Biophysics Program, Stanford School of Medicine, Stanford, CA, United States; Chemical and Systems Biology Department, Cancer Biology Program, Stanford School of Medicine, Stanford, CA, United States.
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10
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Mevissen TET, Prasad AV, Walter JC. TRIM21-dependent target protein ubiquitination mediates cell-free Trim-Away. Cell Rep 2023; 42:112125. [PMID: 36807144 PMCID: PMC10435667 DOI: 10.1016/j.celrep.2023.112125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 11/02/2022] [Accepted: 01/31/2023] [Indexed: 02/22/2023] Open
Abstract
Tripartite motif-containing protein 21 (TRIM21) is a cytosolic antibody receptor and E3 ubiquitin ligase that promotes destruction of a broad range of pathogens. TRIM21 also underlies the antibody-dependent protein targeting method Trim-Away. Current evidence suggests that TRIM21 binding to antibodies leads to formation of a self-anchored K63 ubiquitin chain on the N terminus of TRIM21 that triggers the destruction of TRIM21, antibody, and target protein. Here, we report that addition of antibody and TRIM21 to Xenopus egg extracts promotes efficient degradation of endogenous target proteins, establishing cell-free Trim-Away as a powerful tool to interrogate protein function. Chemical methylation of TRIM21 had no effect on target proteolysis, whereas deletion of all lysine residues in targets abolished their ubiquitination and proteasomal degradation. These results demonstrate that target protein, but not TRIM21, polyubiquitination is required for Trim-Away, and they suggest that current models of TRIM21 function should be fundamentally revised.
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Affiliation(s)
- Tycho E T Mevissen
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Boston, MA, USA.
| | - Anisa V Prasad
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Boston, MA, USA.
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11
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Yaneva D, Sparks JL, Donsbach M, Zhao S, Weickert P, Bezalel-Buch R, Stingele J, Walter JC. The FANCJ helicase unfolds DNA-protein crosslinks to promote their repair. Mol Cell 2023; 83:43-56.e10. [PMID: 36608669 PMCID: PMC9881729 DOI: 10.1016/j.molcel.2022.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 08/12/2022] [Accepted: 12/08/2022] [Indexed: 01/07/2023]
Abstract
Endogenous and exogenous agents generate DNA-protein crosslinks (DPCs), whose replication-dependent degradation by the SPRTN protease suppresses aging and liver cancer. SPRTN is activated after the replicative CMG helicase bypasses a DPC and polymerase extends the nascent strand to the adduct. Here, we identify a role for the 5'-to-3' helicase FANCJ in DPC repair. In addition to supporting CMG bypass, FANCJ is essential for SPRTN activation. FANCJ binds ssDNA downstream of the DPC and uses its ATPase activity to unfold the protein adduct, which exposes the underlying DNA and enables cleavage of the adduct. FANCJ-dependent DPC unfolding is also essential for translesion DNA synthesis past DPCs that cannot be degraded. In summary, our results show that helicase-mediated protein unfolding enables multiple events in DPC repair.
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Affiliation(s)
- Denitsa Yaneva
- Department of Biochemistry, Ludwig-Maximilians-University, 81377 Munich, Germany; Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Justin L Sparks
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
| | - Maximilian Donsbach
- Department of Biochemistry, Ludwig-Maximilians-University, 81377 Munich, Germany; Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Shubo Zhao
- Department of Biochemistry, Ludwig-Maximilians-University, 81377 Munich, Germany; Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Pedro Weickert
- Department of Biochemistry, Ludwig-Maximilians-University, 81377 Munich, Germany; Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Rachel Bezalel-Buch
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Saint Louis, MO, USA
| | - Julian Stingele
- Department of Biochemistry, Ludwig-Maximilians-University, 81377 Munich, Germany; Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany.
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute.
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12
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Kochenova OV, Mukkavalli S, Raman M, Walter JC. Cooperative assembly of p97 complexes involved in replication termination. Nat Commun 2022; 13:6591. [PMID: 36329031 PMCID: PMC9633789 DOI: 10.1038/s41467-022-34210-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 10/18/2022] [Indexed: 11/06/2022] Open
Abstract
The p97 ATPase extracts polyubiquitylated proteins from diverse cellular structures in preparation for destruction by the proteasome. p97 functions with Ufd1-Npl4 and a variety of UBA-UBX co-factors, but how p97 complexes assemble on ubiquitylated substrates is unclear. To address this, we investigated how p97 disassembles the CMG helicase after it is ubiquitylated during replication termination. We show that p97Ufd1-Npl4 recruitment to CMG requires the UBA-UBX protein Ubxn7, and conversely, stable Ubxn7 binding to CMG requires p97Ufd1-Npl4. This cooperative assembly involves interactions between Ubxn7, p97, Ufd1-Npl4, and ubiquitin. Another p97 co-factor, Faf1, partially compensates for the loss of Ubxn7. Surprisingly, p97Ufd1-Npl4-Ubxn7 and p97Ufd1-Npl4-Faf1 also assemble cooperatively on unanchored ubiquitin chains. We propose that cooperative and substrate-independent recognition of ubiquitin chains allows p97 to recognize an unlimited number of polyubiquitylated proteins while avoiding the formation of partial, inactive complexes.
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Affiliation(s)
- Olga V Kochenova
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA, 02115, USA
- Howard Hughes Medical Institute, Boston, MA, USA
| | - Sirisha Mukkavalli
- Department of Developmental Molecular and Chemical Biology, Tufts University School of Medicine, Boston, MA, 02111, USA
| | - Malavika Raman
- Department of Developmental Molecular and Chemical Biology, Tufts University School of Medicine, Boston, MA, 02111, USA
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA, 02115, USA.
- Howard Hughes Medical Institute, Boston, MA, USA.
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13
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Semlow DR, MacKrell VA, Walter JC. The HMCES DNA-protein cross-link functions as an intermediate in DNA interstrand cross-link repair. Nat Struct Mol Biol 2022; 29:451-462. [PMID: 35534579 PMCID: PMC9949344 DOI: 10.1038/s41594-022-00764-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 03/28/2022] [Indexed: 12/31/2022]
Abstract
The 5-hydroxymethylcytosine binding, embryonic stem-cell-specific (HMCES) protein forms a covalent DNA-protein cross-link (DPC) with abasic (AP) sites in single-stranded DNA, and the resulting HMCES-DPC is thought to suppress double-strand break formation in S phase. However, the dynamics of HMCES cross-linking and whether any DNA repair pathways normally include an HMCES-DPC intermediate remain unknown. Here, we use Xenopus egg extracts to show that an HMCES-DPC forms on the AP site generated during replication-coupled DNA interstrand cross-link repair. We show that HMCES cross-links form on DNA after the replicative CDC45-MCM2-7-GINS (CMG) helicase has passed over the AP site, and that HMCES is subsequently removed by the SPRTN protease. The HMCES-DPC suppresses double-strand break formation, slows translesion synthesis past the AP site and introduces a bias for insertion of deoxyguanosine opposite the AP site. These data demonstrate that HMCES-DPCs form as intermediates in replication-coupled repair, and they suggest a general model of how HMCES protects AP sites during DNA replication.
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Affiliation(s)
- Daniel R Semlow
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA.
| | - Victoria A MacKrell
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA, USA. .,Howard Hughes Medical Institute, Boston, MA, USA.
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14
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Schubert L, Hendriks IA, Hertz EPT, Wu W, Sellés‐Baiget S, Hoffmann S, Viswalingam KS, Gallina I, Pentakota S, Benedict B, Johansen J, Apelt K, Luijsterburg MS, Rasmussen S, Lisby M, Liu Y, Nielsen ML, Mailand N, Duxin JP. SCAI promotes error‐free repair of DNA interstrand crosslinks via the Fanconi anemia pathway. EMBO Rep 2022; 23:e53639. [PMID: 35156773 PMCID: PMC8982572 DOI: 10.15252/embr.202153639] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 01/19/2022] [Accepted: 01/24/2022] [Indexed: 01/05/2023] Open
Abstract
DNA interstrand crosslinks (ICLs) are cytotoxic lesions that threaten genome integrity. The Fanconi anemia (FA) pathway orchestrates ICL repair during DNA replication, with ubiquitylated FANCI‐FANCD2 (ID2) marking the activation step that triggers incisions on DNA to unhook the ICL. Restoration of intact DNA requires the coordinated actions of polymerase ζ (Polζ)‐mediated translesion synthesis (TLS) and homologous recombination (HR). While the proteins mediating FA pathway activation have been well characterized, the effectors regulating repair pathway choice to promote error‐free ICL resolution remain poorly defined. Here, we uncover an indispensable role of SCAI in ensuring error‐free ICL repair upon activation of the FA pathway. We show that SCAI forms a complex with Polζ and localizes to ICLs during DNA replication. SCAI‐deficient cells are exquisitely sensitive to ICL‐inducing drugs and display major hallmarks of FA gene inactivation. In the absence of SCAI, HR‐mediated ICL repair is defective, and breaks are instead re‐ligated by polymerase θ‐dependent microhomology‐mediated end‐joining, generating deletions spanning the ICL site and radial chromosomes. Our work establishes SCAI as an integral FA pathway component, acting at the interface between TLS and HR to promote error‐free ICL repair.
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Affiliation(s)
- Lisa Schubert
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Ivo A Hendriks
- Proteomics Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Emil P T Hertz
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Wei Wu
- Center for Chromosome Stability Department of Cellular and Molecular Medicine University of Copenhagen Copenhagen Denmark
| | - Selene Sellés‐Baiget
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Saskia Hoffmann
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | | | - Irene Gallina
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Satyakrishna Pentakota
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Bente Benedict
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Joachim Johansen
- Disease Systems Biology Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Katja Apelt
- Department of Human Genetics Leiden University Medical Center Leiden The Netherlands
| | | | - Simon Rasmussen
- Disease Systems Biology Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Michael Lisby
- Center for Chromosome Stability Department of Cellular and Molecular Medicine University of Copenhagen Copenhagen Denmark
- Department of Biology University of Copenhagen Copenhagen Denmark
| | - Ying Liu
- Center for Chromosome Stability Department of Cellular and Molecular Medicine University of Copenhagen Copenhagen Denmark
| | - Michael L Nielsen
- Proteomics Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
| | - Niels Mailand
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
- Center for Chromosome Stability Department of Cellular and Molecular Medicine University of Copenhagen Copenhagen Denmark
| | - Julien P Duxin
- Protein Signaling Program Novo Nordisk Foundation Center for Protein Research University of Copenhagen Copenhagen Denmark
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15
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Conwell SC, Cranford MT, Kavlashvili T, Dewar JM. Replication fork collapse in vitro using Xenopus egg extracts. Methods Enzymol 2022; 672:317-338. [DOI: 10.1016/bs.mie.2022.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Sato K, Martin-Pintado N, Post H, Altelaar M, Knipscheer P. Multistep mechanism of G-quadruplex resolution during DNA replication. SCIENCE ADVANCES 2021; 7:eabf8653. [PMID: 34559566 PMCID: PMC8462899 DOI: 10.1126/sciadv.abf8653] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
G-quadruplex (or G4) structures form in guanine-rich DNA sequences and threaten genome stability when not properly resolved. G4 unwinding occurs during S phase via an unknown mechanism. Using Xenopus egg extracts, we define a three-step G4 unwinding mechanism that acts during DNA replication. First, the replicative helicase composed of Cdc45, MCM2-7 and GINS (CMG) stalls at a leading strand G4 structure. Second, the DEAH-box helicase 36 (DHX36) mediates bypass of the CMG past the intact G4 structure, allowing approach of the leading strand to the G4. Third, G4 structure unwinding by the Fanconi anemia complementation group J helicase (FANCJ) enables DNA polymerase to synthesize past the G4 motif. A G4 on the lagging strand template does not stall CMG but still requires DNA replication for unwinding. DHX36 and FANCJ have partially redundant roles, conferring pathway robustness. This previously unknown genome maintenance pathway promotes faithful G4 replication, thereby avoiding genome instability.
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Affiliation(s)
- Koichi Sato
- Oncode Institute, Hubrecht Institute–KNAW and University Medical Center Utrecht, Uppsalalaan 8, Utrecht 3584 CT, Netherlands
| | - Nerea Martin-Pintado
- Oncode Institute, Hubrecht Institute–KNAW and University Medical Center Utrecht, Uppsalalaan 8, Utrecht 3584 CT, Netherlands
| | - Harm Post
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, Utrecht 3584 CH, Netherlands
| | - Maarten Altelaar
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, Utrecht 3584 CH, Netherlands
| | - Puck Knipscheer
- Oncode Institute, Hubrecht Institute–KNAW and University Medical Center Utrecht, Uppsalalaan 8, Utrecht 3584 CT, Netherlands
- Corresponding author.
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17
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Liu JCY, Kühbacher U, Larsen NB, Borgermann N, Garvanska DH, Hendriks IA, Ackermann L, Haahr P, Gallina I, Guérillon C, Branigan E, Hay RT, Azuma Y, Nielsen ML, Duxin JP, Mailand N. Mechanism and function of DNA replication-independent DNA-protein crosslink repair via the SUMO-RNF4 pathway. EMBO J 2021; 40:e107413. [PMID: 34346517 PMCID: PMC8441304 DOI: 10.15252/embj.2020107413] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 07/03/2021] [Accepted: 07/12/2021] [Indexed: 11/09/2022] Open
Abstract
DNA-protein crosslinks (DPCs) obstruct essential DNA transactions, posing a serious threat to genome stability and functionality. DPCs are proteolytically processed in a ubiquitin- and DNA replication-dependent manner by SPRTN and the proteasome but can also be resolved via targeted SUMOylation. However, the mechanistic basis of SUMO-mediated DPC resolution and its interplay with replication-coupled DPC repair remain unclear. Here, we show that the SUMO-targeted ubiquitin ligase RNF4 defines a major pathway for ubiquitylation and proteasomal clearance of SUMOylated DPCs in the absence of DNA replication. Importantly, SUMO modifications of DPCs neither stimulate nor inhibit their rapid DNA replication-coupled proteolysis. Instead, DPC SUMOylation provides a critical salvage mechanism to remove DPCs formed after DNA replication, as DPCs on duplex DNA do not activate interphase DNA damage checkpoints. Consequently, in the absence of the SUMO-RNF4 pathway cells are able to enter mitosis with a high load of unresolved DPCs, leading to defective chromosome segregation and cell death. Collectively, these findings provide mechanistic insights into SUMO-driven pathways underlying replication-independent DPC resolution and highlight their critical importance in maintaining chromosome stability and cellular fitness.
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Affiliation(s)
- Julio C Y Liu
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Ulrike Kühbacher
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Nicolai B Larsen
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Nikoline Borgermann
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Dimitriya H Garvanska
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Ivo A Hendriks
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Leena Ackermann
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Peter Haahr
- Netherlands Cancer InstituteAmsterdamThe Netherlands
| | - Irene Gallina
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Claire Guérillon
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Emma Branigan
- Centre for Gene Regulation and ExpressionSchool of Life SciencesUniversity of DundeeDundeeUK
| | - Ronald T Hay
- Centre for Gene Regulation and ExpressionSchool of Life SciencesUniversity of DundeeDundeeUK
| | - Yoshiaki Azuma
- Department of Molecular BiosciencesUniversity of KansasLawrenceKSUSA
| | - Michael Lund Nielsen
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Julien P Duxin
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
| | - Niels Mailand
- Protein Signaling ProgramNovo Nordisk Foundation Center for Protein ResearchUniversity of CopenhagenCopenhagenDenmark
- Center for Chromosome StabilityDepartment of Cellular and Molecular MedicineUniversity of CopenhagenCopenhagenDenmark
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18
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Tao Y, Aparicio T, Li M, Leong KW, Zha S, Gautier J. Inhibition of DNA replication initiation by silver nanoclusters. Nucleic Acids Res 2021; 49:5074-5083. [PMID: 33905520 PMCID: PMC8136792 DOI: 10.1093/nar/gkab271] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 03/10/2021] [Accepted: 04/07/2021] [Indexed: 01/19/2023] Open
Abstract
Silver nanoclusters (AgNCs) have outstanding physicochemical characteristics, including the ability to interact with proteins and DNA. Given the growing number of diagnostic and therapeutic applications of AgNCs, we evaluated the impact of AgNCs on DNA replication and DNA damage response in cell-free extracts prepared from unfertilized Xenopus laevis eggs. We find that, among a number of silver nanomaterials, AgNCs uniquely inhibited genomic DNA replication and abrogated the DNA replication checkpoint in cell-free extracts. AgNCs did not affect nuclear membrane or nucleosome assembly. AgNCs-supplemented extracts showed a strong defect in the loading of the mini chromosome maintenance (MCM) protein complex, the helicase that unwinds DNA ahead of replication forks. FLAG-AgNCs immunoprecipitation and mass spectrometry analysis of AgNCs associated proteins demonstrated direct interaction between MCM and AgNCs. Our studies indicate that AgNCs directly prevent the loading of MCM, blocking pre-replication complex (pre-RC) assembly and subsequent DNA replication initiation. Collectively, our findings broaden the scope of silver nanomaterials experimental applications, establishing AgNCs as a novel tool to study chromosomal DNA replication.
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Affiliation(s)
- Yu Tao
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA
| | - Tomas Aparicio
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA
| | - Mingqiang Li
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Kam W Leong
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Shan Zha
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA.,Departments of Pediatrics, Pathology and Cell Biology, Immunology and Microbiology, Columbia University, New York, NY 10032, USA.,Herbert Irving Comprehensive Cancer Center, Columbia University, New York, NY 10032, USA
| | - Jean Gautier
- Institute for Cancer Genetics, Columbia University, New York, NY 10032, USA.,Herbert Irving Comprehensive Cancer Center, Columbia University, New York, NY 10032, USA.,Department of Genetics and Development, Columbia University, New York, NY 10032, USA
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19
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Vrtis KB, Dewar JM, Chistol G, Wu RA, Graham TGW, Walter JC. Single-strand DNA breaks cause replisome disassembly. Mol Cell 2021; 81:1309-1318.e6. [PMID: 33484638 DOI: 10.1016/j.molcel.2020.12.039] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 12/11/2020] [Accepted: 12/23/2020] [Indexed: 11/16/2022]
Abstract
DNA damage impedes replication fork progression and threatens genome stability. Upon encounter with most DNA adducts, the replicative CMG helicase (CDC45-MCM2-7-GINS) stalls or uncouples from the point of synthesis, yet eventually resumes replication. However, little is known about the effect on replication of single-strand breaks or "nicks," which are abundant in mammalian cells. Using Xenopus egg extracts, we reveal that CMG collision with a nick in the leading strand template generates a blunt-ended double-strand break (DSB). Moreover, CMG, which encircles the leading strand template, "runs off" the end of the DSB. In contrast, CMG collision with a lagging strand nick generates a broken end with a single-stranded overhang. In this setting, CMG translocates along double-stranded DNA beyond the break and is then ubiquitylated and removed from chromatin by the same pathway used during replication termination. Our results show that nicks are uniquely dangerous DNA lesions that invariably cause replisome disassembly, and they suggest that CMG cannot be stored on dsDNA while cells resolve replication stress.
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Affiliation(s)
- Kyle B Vrtis
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA 02115, USA
| | - James M Dewar
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA 02115, USA
| | - Gheorghe Chistol
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA 02115, USA
| | - R Alex Wu
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA 02115, USA
| | - Thomas G W Graham
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA 02115, USA
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, MA 02115, USA; Howard Hughes Medical Institute, Boston, MA 02115, USA.
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20
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Abstract
The DNA damage response (DDR) is a coordinated cellular response to a variety of insults to the genome. DDR initiates the activation of cell cycle checkpoints preventing the propagation of damaged DNA followed by DNA repair, which are both critical in maintaining genome integrity. Several model systems have been developed to study the mechanisms and complexity of checkpoint function. Here we describe the application of cell-free extracts derived from Xenopus eggs as a model system to investigate signaling from DNA damage, modulation of DNA replication, checkpoint activation, and ultimately DNA repair. We outline the preparation of cell-free extracts, DNA substrates, and their subsequent use in assays aimed at understanding the cellular response to DNA damage. Cell-free extracts derived from the eggs of Xenopus laevis remain a robust and versatile system to decipher the biochemical steps underlying this essential characteristic of all cells, critical for genome stability.
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21
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Gallina I, Hendriks IA, Hoffmann S, Larsen NB, Johansen J, Colding-Christensen CS, Schubert L, Sellés-Baiget S, Fábián Z, Kühbacher U, Gao AO, Räschle M, Rasmussen S, Nielsen ML, Mailand N, Duxin JP. The ubiquitin ligase RFWD3 is required for translesion DNA synthesis. Mol Cell 2020; 81:442-458.e9. [PMID: 33321094 PMCID: PMC7864614 DOI: 10.1016/j.molcel.2020.11.029] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 09/14/2020] [Accepted: 11/16/2020] [Indexed: 01/24/2023]
Abstract
Lesions on DNA uncouple DNA synthesis from the replisome, generating stretches of unreplicated single-stranded DNA (ssDNA) behind the replication fork. These ssDNA gaps need to be filled in to complete DNA duplication. Gap-filling synthesis involves either translesion DNA synthesis (TLS) or template switching (TS). Controlling these processes, ubiquitylated PCNA recruits many proteins that dictate pathway choice, but the enzymes regulating PCNA ubiquitylation in vertebrates remain poorly defined. Here we report that the E3 ubiquitin ligase RFWD3 promotes ubiquitylation of proteins on ssDNA. The absence of RFWD3 leads to a profound defect in recruitment of key repair and signaling factors to damaged chromatin. As a result, PCNA ubiquitylation is inhibited without RFWD3, and TLS across different DNA lesions is drastically impaired. We propose that RFWD3 is an essential coordinator of the response to ssDNA gaps, where it promotes ubiquitylation to drive recruitment of effectors of PCNA ubiquitylation and DNA damage bypass. RFWD3 promotes ubiquitylation of proteins on ssDNA RFWD3 regulates DNA damage-induced PCNA ubiquitylation RFWD3 stimulates gap-filling DNA synthesis across different DNA lesions
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Affiliation(s)
- Irene Gallina
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Ivo A Hendriks
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Saskia Hoffmann
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Nicolai B Larsen
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Joachim Johansen
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Camilla S Colding-Christensen
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Lisa Schubert
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Selene Sellés-Baiget
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Zita Fábián
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Ulrike Kühbacher
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Alan O Gao
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Markus Räschle
- Department of Molecular Biotechnology and Systems Biology, Technical University of Kaiserslautern, 67653 Kaiserslautern, Germany
| | - Simon Rasmussen
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Michael L Nielsen
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Niels Mailand
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Julien P Duxin
- The Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark.
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22
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Low E, Chistol G, Zaher MS, Kochenova OV, Walter JC. The DNA replication fork suppresses CMG unloading from chromatin before termination. Genes Dev 2020; 34:1534-1545. [PMID: 32943574 PMCID: PMC7608748 DOI: 10.1101/gad.339739.120] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 09/02/2020] [Indexed: 11/24/2022]
Abstract
When converging replication forks meet during replication termination, the CMG (Cdc45-MCM2-7-GINS) helicase is polyubiquitylated by CRL2Lrr1 and unloaded from chromatin by the p97 ATPase. Here, we investigate the signal that triggers CMG unloading in Xenopus egg extracts using single-molecule and ensemble approaches. We show that converging CMGs pass each other and keep translocating at the same speed as before convergence, whereafter they are rapidly and independently unloaded. When CMG unloading is blocked, diverging CMGs do not support DNA synthesis, indicating that after bypass CMGs encounter the nascent lagging strands of the converging fork and then translocate along double-stranded DNA (dsDNA). However, translocation on dsDNA is not required for CMG's removal from chromatin because in the absence of nascent strand synthesis, converging CMGs are still unloaded. Moreover, recombinant CMG added to nuclear extract undergoes ubiquitylation and disassembly in the absence of any DNA, and DNA digestion triggers CMG ubiquitylation at stalled replication forks. Our findings suggest that DNA suppresses CMG ubiquitylation during elongation and that this suppression is relieved when CMGs converge, leading to CMG unloading.
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Affiliation(s)
- Emily Low
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, Massachusetts 02115, USA
| | - Gheorghe Chistol
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, Massachusetts 02115, USA
| | - Manal S Zaher
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, Massachusetts 02115, USA
| | - Olga V Kochenova
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, Massachusetts 02115, USA
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Blavatnik Institute, Boston, Massachusetts 02115, USA
- Howard Hughes Medical Institute, Boston, Massachusetts 02115, USA
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23
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Yeast Nucleoplasmic Extracts and an Application to Visualize Chromatin Assembly on Single Molecules of DNA. Methods Mol Biol 2020; 2196:199-209. [PMID: 32889722 DOI: 10.1007/978-1-0716-0868-5_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In eukaryotic cells, the genomic DNA is packaged into chromatin, the basic unit of which is the nucleosome. Studying the mechanism of chromatin formation under physiological conditions is inherently difficult due to the limitations of research approaches. Here we describe how to prepare a biochemical system called yeast nucleoplasmic extracts (YNPE). YNPE is derived from yeast nuclei, and the in vitro system can mimic the physiological conditions of the yeast nucleus in vivo. In YNPE, the dynamic process of chromatin assembly has been observed in real time at the single-molecule level by total internal reflection fluorescence microscopy. YNPE provides a novel tool to investigate many aspects of chromatin assembly under physiological conditions and is competent for single-molecule approaches.
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The FANC/BRCA Pathway Releases Replication Blockades by Eliminating DNA Interstrand Cross-Links. Genes (Basel) 2020; 11:genes11050585. [PMID: 32466131 PMCID: PMC7288313 DOI: 10.3390/genes11050585] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/14/2020] [Accepted: 05/21/2020] [Indexed: 12/24/2022] Open
Abstract
DNA interstrand cross-links (ICLs) represent a major barrier blocking DNA replication fork progression. ICL accumulation results in growth arrest and cell death—particularly in cell populations undergoing high replicative activity, such as cancer and leukemic cells. For this reason, agents able to induce DNA ICLs are widely used as chemotherapeutic drugs. However, ICLs are also generated in cells as byproducts of normal metabolic activities. Therefore, every cell must be capable of rescuing lCL-stalled replication forks while maintaining the genetic stability of the daughter cells in order to survive, replicate DNA and segregate chromosomes at mitosis. Inactivation of the Fanconi anemia/breast cancer-associated (FANC/BRCA) pathway by inherited mutations leads to Fanconi anemia (FA), a rare developmental, cancer-predisposing and chromosome-fragility syndrome. FANC/BRCA is the key hub for a complex and wide network of proteins that—upon rescuing ICL-stalled DNA replication forks—allows cell survival. Understanding how cells cope with ICLs is mandatory to ameliorate ICL-based anticancer therapies and provide the molecular basis to prevent or bypass cancer drug resistance. Here, we review our state-of-the-art understanding of the mechanisms involved in ICL resolution during DNA synthesis, with a major focus on how the FANC/BRCA pathway ensures DNA strand opening and prevents genomic instability.
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Rankin S. Reconstituting Nuclear and Chromosome Dynamics Using Xenopus Extracts. Cold Spring Harb Protoc 2019; 2019:pdb.top097105. [PMID: 30150319 DOI: 10.1101/pdb.top097105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Extracts prepared from the eggs of frogs, particularly Xenopus species, have provided critical material for seminal studies of nuclear and chromosome dynamics over several decades. Their usefulness for these types of analyses lies in several important characteristics: stockpiled nuclear components, absence of endogenous DNA, and intact and functioning signaling networks. These factors have allowed detailed molecular analyses of many aspects of chromosome biology, including DNA replication, checkpoint signaling, epigenetic control, and chromosome condensation, cohesion, and segregation. In this introduction, the preparation and application of Xenopus egg extracts for the study of chromosomes and chromatin are described in detail.
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Affiliation(s)
- Susannah Rankin
- Program in Cell Cycle and Cancer Biology, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104; .,Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104
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Sparks JL, Chistol G, Gao AO, Räschle M, Larsen NB, Mann M, Duxin JP, Walter JC. The CMG Helicase Bypasses DNA-Protein Cross-Links to Facilitate Their Repair. Cell 2018; 176:167-181.e21. [PMID: 30595447 DOI: 10.1016/j.cell.2018.10.053] [Citation(s) in RCA: 117] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 09/13/2018] [Accepted: 10/24/2018] [Indexed: 02/04/2023]
Abstract
Covalent DNA-protein cross-links (DPCs) impede replication fork progression and threaten genome integrity. Using Xenopus egg extracts, we previously showed that replication fork collision with DPCs causes their proteolysis, followed by translesion DNA synthesis. We show here that when DPC proteolysis is blocked, the replicative DNA helicase CMG (CDC45, MCM2-7, GINS), which travels on the leading strand template, bypasses an intact leading strand DPC. Single-molecule imaging reveals that GINS does not dissociate from CMG during bypass and that CMG slows dramatically after bypass, likely due to uncoupling from the stalled leading strand. The DNA helicase RTEL1 facilitates bypass, apparently by generating single-stranded DNA beyond the DPC. The absence of RTEL1 impairs DPC proteolysis, suggesting that CMG must bypass the DPC to enable proteolysis. Our results suggest a mechanism that prevents inadvertent CMG destruction by DPC proteases, and they reveal CMG's remarkable capacity to overcome obstacles on its translocation strand.
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Affiliation(s)
- Justin L Sparks
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
| | - Gheorghe Chistol
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA
| | - Alan O Gao
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Markus Räschle
- Department of Molecular Biotechnology and Systems Biology, Technical University of Kaiserslautern, 67653 Kaiserslautern, Germany
| | - Nicolai B Larsen
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Matthias Mann
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark; Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
| | - Julien P Duxin
- Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Johannes C Walter
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.
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