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Gelot C, Kovacs MT, Miron S, Mylne E, Haan A, Boeffard-Dosierre L, Ghouil R, Popova T, Dingli F, Loew D, Guirouilh-Barbat J, Del Nery E, Zinn-Justin S, Ceccaldi R. Publisher Correction: Polθ is phosphorylated by PLK1 to repair double-strand breaks in mitosis. Nature 2024; 626:E13. [PMID: 38273133 PMCID: PMC10866694 DOI: 10.1038/s41586-024-07025-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2024]
Affiliation(s)
- Camille Gelot
- INSERM U830, PSL Research University, Institut Curie, Paris, France
| | | | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Emilie Mylne
- INSERM U830, PSL Research University, Institut Curie, Paris, France
| | - Alexis Haan
- INSERM U830, PSL Research University, Institut Curie, Paris, France
| | - Liza Boeffard-Dosierre
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Rania Ghouil
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Tatiana Popova
- INSERM U830, DNA Repair and Uveal Melanoma (D.R.U.M.), Equipe labellisée par la Ligue Nationale Contre le Cancer, PSL Research University, Institut Curie, Paris, France
| | - Florent Dingli
- CurieCoreTech Mass Spectrometry Proteomics, Institut Curie, PSL Research University, Paris, France
| | - Damarys Loew
- CurieCoreTech Mass Spectrometry Proteomics, Institut Curie, PSL Research University, Paris, France
| | - Josée Guirouilh-Barbat
- Université de Paris, INSERM U1016, UMR 8104 CNRS, Equipe Labellisée Ligue Nationale Contre le Cancer, Institut Cochin, Paris, France
| | - Elaine Del Nery
- Department of Translational Research-Biophenics High-Content Screening Laboratory, Cell and Tissue Imaging Facility (PICT-IBiSA), PSL Research University, Institut Curie, Paris, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Raphael Ceccaldi
- INSERM U830, PSL Research University, Institut Curie, Paris, France.
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2
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Alvaro-Aranda L, Petitalot A, Djeghmoum Y, Panigada D, Singh JK, Ehlén Å, Vugic D, Martin C, Miron S, Contreras-Perez A, Nhiri N, Boucherit V, Lafitte P, Dumoulin I, Rouleau E, Jacquet E, Feliubadaló L, Del Valle J, Stoppa-Lyonnet D, Zinn-Justin S, Lázaro C, Caputo SM, Carreira A. The BRCA2 R2645G variant increases DNA binding and induces hyper-recombination. Nucleic Acids Res 2023:gkad1222. [PMID: 38142462 DOI: 10.1093/nar/gkad1222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 11/30/2023] [Accepted: 12/12/2023] [Indexed: 12/26/2023] Open
Abstract
BRCA2 tumor suppressor protein ensures genome integrity by mediating DNA repair via homologous recombination (HR). This function is executed in part by its canonical DNA binding domain located at the C-terminus (BRCA2CTD), the only folded domain of the protein. Most germline pathogenic missense variants are located in this highly conserved region which binds to single-stranded DNA (ssDNA) and to the acidic protein DSS1. These interactions are essential for the HR function of BRCA2. Here, we report that the variant R2645G, identified in breast cancer and located at the DSS1 interface, unexpectedly increases the ssDNA binding activity of BRCA2CTDin vitro. Human cells expressing this variant display a hyper-recombination phenotype, chromosomal instability in the form of chromatid gaps when exposed to DNA damage, and increased PARP inhibitor sensitivity. In mouse embryonic stem cells (mES), this variant alters viability and confers sensitivity to cisplatin and Mitomycin C. These results suggest that BRCA2 interaction with ssDNA needs to be tightly regulated to limit HR and prevent chromosomal instability and we propose that this control mechanism involves DSS1. Given that several missense variants located within this region have been identified in breast cancer patients, these findings might have clinical implications for carriers.
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Affiliation(s)
- Lucia Alvaro-Aranda
- Genome Instability and Cancer Predisposition Laboratory, Centro de Biologia Molecular Severo Ochoa (CBMSO), CSIC-UAM, Madrid 28049, Spain
| | - Ambre Petitalot
- Department of Genetics, Institut Curie, Paris 75005, France
- PSL Research University, Paris 75005, France
| | - Yasmina Djeghmoum
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Davide Panigada
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Jenny Kaur Singh
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Åsa Ehlén
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Domagoj Vugic
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Charlotte Martin
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, 91190 Gif-sur-Yvette, France
| | - Aida Contreras-Perez
- Genome Instability and Cancer Predisposition Laboratory, Centro de Biologia Molecular Severo Ochoa (CBMSO), CSIC-UAM, Madrid 28049, Spain
| | - Naima Nhiri
- Institut de Chimie des Substances Naturelles, Paris-Saclay University, CNRS, 91190 Gif-sur-Yvette, France
| | - Virginie Boucherit
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Philippe Lafitte
- Department of Genetics, Institut Curie, Paris 75005, France
- PSL Research University, Paris 75005, France
| | - Isaac Dumoulin
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
| | - Etienne Rouleau
- Department of Genetics, Institut Curie, Paris 75005, France
- PSL Research University, Paris 75005, France
| | - Eric Jacquet
- Institut de Chimie des Substances Naturelles, Paris-Saclay University, CNRS, 91190 Gif-sur-Yvette, France
| | - Lidia Feliubadaló
- Hereditary Cancer Program, Catalan Institute of Oncology (ICO), Hereditary Cancer Group, Molecular Mechanisms and Experimental Therapy in Oncology Program, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Spain
- Ciber Oncología (CIBERONC), Instituto Salud Carlos III, Madrid, Spain
| | - Jesús Del Valle
- Hereditary Cancer Program, Catalan Institute of Oncology (ICO), Hereditary Cancer Group, Molecular Mechanisms and Experimental Therapy in Oncology Program, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Spain
- Ciber Oncología (CIBERONC), Instituto Salud Carlos III, Madrid, Spain
| | - Dominique Stoppa-Lyonnet
- Department of Genetics, Institut Curie, Paris 75005, France
- Paris-Cité University, Paris, France
- INSERM U830, Institut Curie, Paris 75005, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, 91190 Gif-sur-Yvette, France
| | - Conxi Lázaro
- Hereditary Cancer Program, Catalan Institute of Oncology (ICO), Hereditary Cancer Group, Molecular Mechanisms and Experimental Therapy in Oncology Program, Institut d'Investigació Biomèdica de Bellvitge (IDIBELL), L'Hospitalet de Llobregat, Spain
- Ciber Oncología (CIBERONC), Instituto Salud Carlos III, Madrid, Spain
| | - Sandrine M Caputo
- Department of Genetics, Institut Curie, Paris 75005, France
- PSL Research University, Paris 75005, France
| | - Aura Carreira
- Genome Instability and Cancer Predisposition Laboratory, Centro de Biologia Molecular Severo Ochoa (CBMSO), CSIC-UAM, Madrid 28049, Spain
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405 Orsay, France
- Paris-Saclay University CNRS, UMR3348, F-91405 Orsay, France
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3
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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. Sci Adv 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] [What about the content of this article? (0)] [Affiliation(s)] [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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4
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Gelot C, Kovacs MT, Miron S, Mylne E, Haan A, Boeffard-Dosierre L, Ghouil R, Popova T, Dingli F, Loew D, Guirouilh-Barbat J, Del Nery E, Zinn-Justin S, Ceccaldi R. Polθ is phosphorylated by PLK1 to repair double-strand breaks in mitosis. Nature 2023; 621:415-422. [PMID: 37674080 PMCID: PMC10499603 DOI: 10.1038/s41586-023-06506-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 08/01/2023] [Indexed: 09/08/2023]
Abstract
DNA double-strand breaks (DSBs) are deleterious lesions that challenge genome integrity. To mitigate this threat, human cells rely on the activity of multiple DNA repair machineries that are tightly regulated throughout the cell cycle1. In interphase, DSBs are mainly repaired by non-homologous end joining and homologous recombination2. However, these pathways are completely inhibited in mitosis3-5, leaving the fate of mitotic DSBs unknown. Here we show that DNA polymerase theta6 (Polθ) repairs mitotic DSBs and thereby maintains genome integrity. In contrast to other DSB repair factors, Polθ function is activated in mitosis upon phosphorylation by Polo-like kinase 1 (PLK1). Phosphorylated Polθ is recruited by a direct interaction with the BRCA1 C-terminal domains of TOPBP1 to mitotic DSBs, where it mediates joining of broken DNA ends. Loss of Polθ leads to defective repair of mitotic DSBs, resulting in a loss of genome integrity. This is further exacerbated in cells that are deficient in homologous recombination, where loss of mitotic DSB repair by Polθ results in cell death. Our results identify mitotic DSB repair as the underlying cause of synthetic lethality between Polθ and homologous recombination. Together, our findings reveal the critical importance of mitotic DSB repair in the maintenance of genome integrity.
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Affiliation(s)
- Camille Gelot
- INSERM U830, PSL Research University, Institut Curie, Paris, France
| | | | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Emilie Mylne
- INSERM U830, PSL Research University, Institut Curie, Paris, France
| | - Alexis Haan
- INSERM U830, PSL Research University, Institut Curie, Paris, France
| | - Liza Boeffard-Dosierre
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Rania Ghouil
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Tatiana Popova
- INSERM U830, DNA Repair and Uveal Melanoma (D.R.U.M.), Equipe labellisée par la Ligue Nationale Contre le Cancer, PSL Research University, Institut Curie, Paris, France
| | - Florent Dingli
- CurieCoreTech Mass Spectrometry Proteomics, Institut Curie, PSL Research University, Paris, France
| | - Damarys Loew
- CurieCoreTech Mass Spectrometry Proteomics, Institut Curie, PSL Research University, Paris, France
| | - Josée Guirouilh-Barbat
- Université de Paris, INSERM U1016, UMR 8104 CNRS, Equipe Labellisée Ligue Nationale Contre le Cancer, Institut Cochin, Paris, France
| | - Elaine Del Nery
- Department of Translational Research-Biophenics High-Content Screening Laboratory, Cell and Tissue Imaging Facility (PICT-IBiSA), PSL Research University, Institut Curie, Paris, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Paris-Saclay University, Gif-sur-Yvette, France
| | - Raphael Ceccaldi
- INSERM U830, PSL Research University, Institut Curie, Paris, France.
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5
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Taouis K, Vacher S, Guirouilh-Barbat J, Camonis J, Formstecher E, Popova T, Hamy AS, Petitalot A, Lidereau R, Caputo SM, Zinn-Justin S, Bièche I, Driouch K, Lallemand F. WWOX binds MERIT40 and modulates its function in homologous recombination, implications in breast cancer. Cancer Gene Ther 2023; 30:1144-1155. [PMID: 37248434 PMCID: PMC10425285 DOI: 10.1038/s41417-023-00626-x] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 04/26/2023] [Accepted: 05/09/2023] [Indexed: 05/31/2023]
Abstract
The tumor suppressor gene WWOX is localized in an unstable chromosomal region and its expression is decreased or absent in several types of cancer. A low expression of WWOX is associated with a poor prognosis in breast cancer (BC). It has recently been shown that WWOX contributes to genome stability through its role in the DNA damage response (DDR). In breast cancer cells, WWOX inhibits homologous recombination (HR), and thus promotes the repair of DNA double-stranded breaks (DSBs) by non-homologous end joining (NHEJ). The fine-tuning modulation of HR activity is crucial. Its under or overstimulation inducing genome alterations that can induce cancer. MERIT40 is a positive regulator of the DDR. This protein is indispensable for the function of the multi-protein complex BRCA1-A, which suppresses excessive HR activity. MERIT40 also recruits Tankyrase, a positive regulator of HR, to the DSBs to stimulate DNA repair. Here, we identified MERIT40 as a new molecular partner of WWOX. We demonstrated that WWOX inhibited excessive HR activity induced by overexpression of MERIT40. We showed that WWOX impaired the MERIT40-Tankyrase interaction preventing the role of the complex on DSBs. Furthermore, we found that MERIT40 is overexpressed in BC and that this overexpression is associated to a poor prognosis. These results strongly suggest that WWOX, through its interaction with MERIT40, prevents the deleterious impact of excessive HR on BC development by inhibiting MERIT40-Tankyrase association. This inhibitory effect of WWOX would oppose MERIT40-dependent BC development.
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Affiliation(s)
- Karim Taouis
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
- Paris Sciences Lettres Research University, Paris, France
| | - Sophie Vacher
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
- Paris Sciences Lettres Research University, Paris, France
| | - Josée Guirouilh-Barbat
- Laboratoire Recombinaison-Réparation et Cancer UMR8200 Stabilité Génétique et Oncogenèse Institut Gustave Roussy, PR2, pièce 426114 Rue Edouard Vaillant, 94805, Villejuif, France
| | | | | | - Tatiana Popova
- Centre De Recherche, Institut Curie, Paris, F-75248, France
- INSERM U830, Paris, F-75248, France
| | - Anne-Sophie Hamy
- Residual Tumor & Response to Treatment Laboratory, RT2Lab, Translational Research Department, INSERM, U932 Immunity and Cancer, University Paris, Paris, France
- Department of Medical Oncology, Institut Curie, Paris, France
- University Paris, Paris, France
| | - Ambre Petitalot
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
| | - Rosette Lidereau
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
| | - Sandrine M Caputo
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
- Paris Sciences Lettres Research University, Paris, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell, CEA, CNRS, Université Paris-Sud, Gif-sur-Yvette, France
| | - Ivan Bièche
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
- INSERM U1016, Université Paris Descartes, 4 avenue de l'observatoire, Paris, France
| | - Keltouma Driouch
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France
- Paris Sciences Lettres Research University, Paris, France
| | - François Lallemand
- Service de génétique, unité de pharmacogénomique, Institut Curie, 26 rue d'Ulm, Paris, France.
- Paris Sciences Lettres Research University, Paris, France.
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6
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Janssen A, Marcelot A, Breusegem S, Legrand P, Zinn-Justin S, Larrieu D. The BAF A12T mutation disrupts lamin A/C interaction, impairing robust repair of nuclear envelope ruptures in Nestor-Guillermo progeria syndrome cells. Nucleic Acids Res 2022; 50:9260-9278. [PMID: 36039758 PMCID: PMC9458464 DOI: 10.1093/nar/gkac726] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/02/2022] [Accepted: 08/12/2022] [Indexed: 12/24/2022] Open
Abstract
Nestor-Guillermo progeria syndrome (NGPS) is caused by a homozygous alanine-to-threonine mutation at position 12 (A12T) in barrier-to-autointegration factor (BAF). It is characterized by accelerated aging with severe skeletal abnormalities. BAF is an essential protein binding to DNA and nuclear envelope (NE) proteins, involved in NE rupture repair. Here, we assessed the impact of BAF A12T on NE integrity using NGPS-derived patient fibroblasts. We observed a strong defect in lamin A/C accumulation to NE ruptures in NGPS cells, restored upon homozygous reversion of the pathogenic BAF A12T mutation with CRISPR/Cas9. By combining in vitro and cellular assays, we demonstrated that while the A12T mutation does not affect BAF 3D structure and phosphorylation by VRK1, it specifically decreases the interaction between BAF and lamin A/C. Finally, we revealed that the disrupted interaction does not prevent repair of NE ruptures but instead generates weak points in the NE that lead to a higher frequency of NE re-rupturing in NGPS cells. We propose that this NE fragility could directly contribute to the premature aging phenotype in patients.
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Affiliation(s)
- Anne Janssen
- Department of Clinical Biochemistry, Cambridge Biomedical Campus, Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK
| | - Agathe Marcelot
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex 91190, France
| | - Sophia Breusegem
- Department of Clinical Biochemistry, Cambridge Biomedical Campus, Cambridge Institute for Medical Research, University of Cambridge, Cambridge CB2 0XY, UK
| | - Pierre Legrand
- Synchrotron SOLEIL, HelioBio group, L’Orme des Merisiers, Gif sur-Yvette 91190, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex 91190, France
| | - Delphine Larrieu
- To whom correspondence should be addressed. Tel: +44 1223 334067;
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7
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Etourneaud L, Moussa A, Rass E, Genet D, Willaume S, Chabance-Okumura C, Wanschoor P, Picotto J, Thézé B, Dépagne J, Veaute X, Dizet E, Busso D, Barascu A, Irbah L, Kortulewski T, Campalans A, Le Chalony C, Zinn-Justin S, Scully R, Pennarun G, Bertrand P. Lamin B1 sequesters 53BP1 to control its recruitment to DNA damage. Sci Adv 2021; 7:eabb3799. [PMID: 34452908 PMCID: PMC8397269 DOI: 10.1126/sciadv.abb3799] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 07/07/2021] [Indexed: 05/09/2023]
Abstract
Double-strand breaks (DSBs) are harmful lesions and a major cause of genome instability. Studies have suggested a link between the nuclear envelope and the DNA damage response. Here, we show that lamin B1, a major component of the nuclear envelope, interacts directly with 53BP1 protein, which plays a pivotal role in the DSB repair. This interaction is dissociated after DNA damage. Lamin B1 overexpression impedes 53BP1 recruitment to DNA damage sites and leads to a persistence of DNA damage, a defect in nonhomologous end joining and an increased sensitivity to DSBs. The identification of interactions domains between lamin B1 and 53BP1 allows us to demonstrate that the defect of 53BP1 recruitment and the DSB persistence upon lamin B1 overexpression are due to sequestration of 53BP1 by lamin B1. This study highlights lamin B1 as a factor controlling the recruitment of 53BP1 to DNA damage sites upon injury.
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Affiliation(s)
- Laure Etourneaud
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Angela Moussa
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Emilie Rass
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Diane Genet
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Simon Willaume
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Caroline Chabance-Okumura
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Paul Wanschoor
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Julien Picotto
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Benoît Thézé
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Jordane Dépagne
- Genetic Engineering and Expression Platform (CIGEX), iRCM, DRF, CEA, Fontenay-aux-Roses, France
| | - Xavier Veaute
- Genetic Engineering and Expression Platform (CIGEX), iRCM, DRF, CEA, Fontenay-aux-Roses, France
| | - Eléa Dizet
- Genetic Engineering and Expression Platform (CIGEX), iRCM, DRF, CEA, Fontenay-aux-Roses, France
| | - Didier Busso
- Genetic Engineering and Expression Platform (CIGEX), iRCM, DRF, CEA, Fontenay-aux-Roses, France
| | - Aurélia Barascu
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Lamya Irbah
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- Imaging platform, iRCM, DRF, CEA, F-92265 Fontenay-aux-Roses, France
| | - Thierry Kortulewski
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "Radiopathology" Team, iRCM/IBFJ, DRF, CEA, France
| | - Anna Campalans
- Université de Paris and Université Paris Saclay, iRCM/IBFJ, CEA, UMR Stabilité Génétique Cellules Souches et Radiations, "Genetic Instability Research" Team, F-92265 Fontenay-aux-Roses, France
| | - Catherine Le Chalony
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Sophie Zinn-Justin
- Laboratory of Structural Biology and Radiobiology, Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Saclay, F-91190 Gif-sur-Yvette, France
| | - Ralph Scully
- Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Gaëlle Pennarun
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
| | - Pascale Bertrand
- Université de Paris and Université Paris Saclay, INSERM, iRCM/IBFJ, CEA, UMR Stabilité Génétique, Cellules Souches et Radiations, F-92265 Fontenay-aux-Roses, France.
- "DNA Repair and Ageing" Team, iRCM/IBFJ, DRF, CEA, France
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8
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Ghouil R, Miron S, Koornneef L, Veerman J, Paul MW, Le Du MH, Sleddens-Linkels E, van Rossum-Fikkert SE, van Loon Y, Felipe-Medina N, Pendas AM, Maas A, Essers J, Legrand P, Baarends WM, Kanaar R, Zinn-Justin S, Zelensky AN. BRCA2 binding through a cryptic repeated motif to HSF2BP oligomers does not impact meiotic recombination. Nat Commun 2021; 12:4605. [PMID: 34326328 PMCID: PMC8322138 DOI: 10.1038/s41467-021-24871-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 07/12/2021] [Indexed: 11/09/2022] Open
Abstract
BRCA2 and its interactors are required for meiotic homologous recombination (HR) and fertility. Loss of HSF2BP, a BRCA2 interactor, disrupts HR during spermatogenesis. We test the model postulating that HSF2BP localizes BRCA2 to meiotic HR sites, by solving the crystal structure of the BRCA2 fragment in complex with dimeric armadillo domain (ARM) of HSF2BP and disrupting this interaction in a mouse model. This reveals a repeated 23 amino acid motif in BRCA2, each binding the same conserved surface of one ARM domain. In the complex, two BRCA2 fragments hold together two ARM dimers, through a large interface responsible for the nanomolar affinity - the strongest interaction involving BRCA2 measured so far. Deleting exon 12, encoding the first repeat, from mBrca2 disrupts BRCA2 binding to HSF2BP, but does not phenocopy HSF2BP loss. Thus, results herein suggest that the high-affinity oligomerization-inducing BRCA2-HSF2BP interaction is not required for RAD51 and DMC1 recombinase localization in meiotic HR.
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Affiliation(s)
- Rania Ghouil
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Uni Paris-Sud, Uni Paris-Saclay, Gif-sur-Yvette, France
| | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Uni Paris-Sud, Uni Paris-Saclay, Gif-sur-Yvette, France
| | - Lieke Koornneef
- Department of Developmental Biology, Oncode Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Jasper Veerman
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Maarten W Paul
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Marie-Hélène Le Du
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Uni Paris-Sud, Uni Paris-Saclay, Gif-sur-Yvette, France
| | - Esther Sleddens-Linkels
- Department of Developmental Biology, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Sari E van Rossum-Fikkert
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands.,Department of Radiation Oncology, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Yvette van Loon
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Natalia Felipe-Medina
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer (CSIC-Universidad de Salamanca), Salamanca, Spain
| | - Alberto M Pendas
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer (CSIC-Universidad de Salamanca), Salamanca, Spain
| | - Alex Maas
- Department of Cell Biology, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Jeroen Essers
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands.,Department of Radiation Oncology, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands.,Department of Vascular Surgery, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Pierre Legrand
- Synchrotron SOLEIL, L'Orme des Merisiers, Gif-sur-Yvette, France
| | - Willy M Baarends
- Department of Developmental Biology, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands
| | - Roland Kanaar
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands.
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Uni Paris-Sud, Uni Paris-Saclay, Gif-sur-Yvette, France.
| | - Alex N Zelensky
- Department of Molecular Genetics, Oncode Institute, Erasmus MC Cancer Institute, Erasmus University Medical Center, 3000 CA, Rotterdam, The Netherlands.
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9
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Julien M, Ghouil R, Petitalot A, Caputo SM, Carreira A, Zinn-Justin S. Intrinsic Disorder and Phosphorylation in BRCA2 Facilitate Tight Regulation of Multiple Conserved Binding Events. Biomolecules 2021; 11:1060. [PMID: 34356684 PMCID: PMC8301801 DOI: 10.3390/biom11071060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/09/2021] [Accepted: 07/13/2021] [Indexed: 12/26/2022] Open
Abstract
The maintenance of genome integrity in the cell is an essential process for the accurate transmission of the genetic material. BRCA2 participates in this process at several levels, including DNA repair by homologous recombination, protection of stalled replication forks, and cell division. These activities are regulated and coordinated via cell-cycle dependent modifications. Pathogenic variants in BRCA2 cause genome instability and are associated with breast and/or ovarian cancers. BRCA2 is a very large protein of 3418 amino acids. Most well-characterized variants causing a strong predisposition to cancer are mutated in the C-terminal 700 residues DNA binding domain of BRCA2. The rest of the BRCA2 protein is predicted to be disordered. Interactions involving intrinsically disordered regions (IDRs) remain difficult to identify both using bioinformatics tools and performing experimental assays. However, the lack of well-structured binding sites provides unique functional opportunities for BRCA2 to bind to a large set of partners in a tightly regulated manner. We here summarize the predictive and experimental arguments that support the presence of disorder in BRCA2. We describe how BRCA2 IDRs mediate self-assembly and binding to partners during DNA double-strand break repair, mitosis, and meiosis. We highlight how phosphorylation by DNA repair and cell-cycle kinases regulate these interactions. We finally discuss the impact of cancer-associated variants on the function of BRCA2 IDRs and more generally on genome stability and cancer risk.
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Affiliation(s)
- Manon Julien
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91190 Gif-sur-Yvette, France; (M.J.); (R.G.)
- L’Institut de Biologie Intégrative de la Cellule (I2BC), UMR 9198, Paris-Saclay University, 91190 Gif-sur-Yvette, France;
| | - Rania Ghouil
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91190 Gif-sur-Yvette, France; (M.J.); (R.G.)
- L’Institut de Biologie Intégrative de la Cellule (I2BC), UMR 9198, Paris-Saclay University, 91190 Gif-sur-Yvette, France;
| | - Ambre Petitalot
- Service de Génétique, Unité de Génétique Constitutionnelle, Institut Curie, 75005 Paris, France; (A.P.); (S.M.C.)
- Institut Curie, Paris Sciences Lettres Research University, 75005 Paris, France
| | - Sandrine M. Caputo
- Service de Génétique, Unité de Génétique Constitutionnelle, Institut Curie, 75005 Paris, France; (A.P.); (S.M.C.)
- Institut Curie, Paris Sciences Lettres Research University, 75005 Paris, France
| | - Aura Carreira
- L’Institut de Biologie Intégrative de la Cellule (I2BC), UMR 9198, Paris-Saclay University, 91190 Gif-sur-Yvette, France;
- Institut Curie, Paris Sciences Lettres Research University, 75005 Paris, France
- Unité Intégrité du Génome, ARN et Cancer, Institut Curie, CNRS UMR3348, 91405 Orsay, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, 91190 Gif-sur-Yvette, France; (M.J.); (R.G.)
- L’Institut de Biologie Intégrative de la Cellule (I2BC), UMR 9198, Paris-Saclay University, 91190 Gif-sur-Yvette, France;
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10
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Marcelot A, Petitalot A, Ropars V, Le Du MH, Samson C, Dubois S, Hoffmann G, Miron S, Cuniasse P, Marquez JA, Thai R, Theillet FX, Zinn-Justin S. Di-phosphorylated BAF shows altered structural dynamics and binding to DNA, but interacts with its nuclear envelope partners. Nucleic Acids Res 2021; 49:3841-3855. [PMID: 33744941 PMCID: PMC8053085 DOI: 10.1093/nar/gkab184] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 02/05/2021] [Accepted: 03/06/2021] [Indexed: 02/07/2023] Open
Abstract
Barrier-to-autointegration factor (BAF), encoded by the BANF1 gene, is an abundant and ubiquitously expressed metazoan protein that has multiple functions during the cell cycle. Through its ability to cross-bridge two double-stranded DNA (dsDNA), it favours chromosome compaction, participates in post-mitotic nuclear envelope reassembly and is essential for the repair of large nuclear ruptures. BAF forms a ternary complex with the nuclear envelope proteins lamin A/C and emerin, and its interaction with lamin A/C is defective in patients with recessive accelerated aging syndromes. Phosphorylation of BAF by the vaccinia-related kinase 1 (VRK1) is a key regulator of BAF localization and function. Here, we demonstrate that VRK1 successively phosphorylates BAF on Ser4 and Thr3. The crystal structures of BAF before and after phosphorylation are extremely similar. However, in solution, the extensive flexibility of the N-terminal helix α1 and loop α1α2 in BAF is strongly reduced in di-phosphorylated BAF, due to interactions between the phosphorylated residues and the positively charged C-terminal helix α6. These regions are involved in DNA and lamin A/C binding. Consistently, phosphorylation causes a 5000-fold loss of affinity for dsDNA. However, it does not impair binding to lamin A/C Igfold domain and emerin nucleoplasmic region, which leaves open the question of the regulation of these interactions.
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Affiliation(s)
- Agathe Marcelot
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Ambre Petitalot
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Virginie Ropars
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Marie-Hélène Le Du
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Camille Samson
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | | | - Guillaume Hoffmann
- High Throughput Crystallization Lab, EMBL Grenoble Outstation, Grenoble Cedex, France
| | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Philippe Cuniasse
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Jose Antonio Marquez
- High Throughput Crystallization Lab, EMBL Grenoble Outstation, Grenoble Cedex, France
| | | | - François-Xavier Theillet
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
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11
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Roisné-Hamelin F, Pobiega S, Jézéquel K, Miron S, Dépagne J, Veaute X, Busso D, Du MHL, Callebaut I, Charbonnier JB, Cuniasse P, Zinn-Justin S, Marcand S. Mechanism of MRX inhibition by Rif2 at telomeres. Nat Commun 2021; 12:2763. [PMID: 33980827 PMCID: PMC8115599 DOI: 10.1038/s41467-021-23035-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 04/13/2021] [Indexed: 02/06/2023] Open
Abstract
Specific proteins present at telomeres ensure chromosome end stability, in large part through unknown mechanisms. In this work, we address how the Saccharomyces cerevisiae ORC-related Rif2 protein protects telomere. We show that the small N-terminal Rif2 BAT motif (Blocks Addition of Telomeres) previously known to limit telomere elongation and Tel1 activity is also sufficient to block NHEJ and 5' end resection. The BAT motif inhibits the ability of the Mre11-Rad50-Xrs2 complex (MRX) to capture DNA ends. It acts through a direct contact with Rad50 ATP-binding Head domains. Through genetic approaches guided by structural predictions, we identify residues at the surface of Rad50 that are essential for the interaction with Rif2 and its inhibition. Finally, a docking model predicts how BAT binding could specifically destabilise the DNA-bound state of the MRX complex. From these results, we propose that when an MRX complex approaches a telomere, the Rif2 BAT motif binds MRX Head in its ATP-bound resting state. This antagonises MRX transition to its DNA-bound state, and favours a rapid return to the ATP-bound state. Unable to stably capture the telomere end, the MRX complex cannot proceed with the subsequent steps of NHEJ, Tel1-activation and 5' resection.
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Affiliation(s)
- Florian Roisné-Hamelin
- Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Sabrina Pobiega
- Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Kévin Jézéquel
- Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Simona Miron
- Université Paris-Saclay, CNRS, CEA, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Jordane Dépagne
- CIGEx, Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Xavier Veaute
- CIGEx, Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Didier Busso
- CIGEx, Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France
| | - Marie-Hélène Le Du
- Université Paris-Saclay, CNRS, CEA, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Isabelle Callebaut
- Sorbonne Université, Muséum National d'Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie de Physique des Matériaux et de Cosmochimie (IMPMC), Paris, France
| | - Jean-Baptiste Charbonnier
- Université Paris-Saclay, CNRS, CEA, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Philippe Cuniasse
- Université Paris-Saclay, CNRS, CEA, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Sophie Zinn-Justin
- Université Paris-Saclay, CNRS, CEA, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Stéphane Marcand
- Université de Paris, Université Paris-Saclay, Inserm, CEA, Institut de Biologie François Jacob, iRCM, UMR Stabilité Génétique Cellules Souches et Radiations, Fontenay-aux-Roses, France.
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12
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Ehlén Å, Sessa G, Zinn-Justin S, Carreira A. The phospho-dependent role of BRCA2 on the maintenance of chromosome integrity. Cell Cycle 2021; 20:731-741. [PMID: 33691600 PMCID: PMC8098065 DOI: 10.1080/15384101.2021.1892994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 01/21/2021] [Accepted: 02/16/2021] [Indexed: 12/18/2022] Open
Abstract
Chromosomal instability is a hallmark of cancer. The tumor suppressor protein BRCA2 performs an important role in the maintenance of genome integrity particularly in interphase; as a mediator of homologous recombination DNA repair pathway, it participates in the repair of DNA double-strand breaks, inter-strand crosslinks and replicative DNA lesions. BRCA2 also protects stalled replication forks from aberrant degradation. Defects in these functions lead to structural chromosomal aberrations. BRCA2 is a large protein containing highly disordered regions that are heavily phosphorylated particularly in mitosis. The functions of these modifications are getting elucidated and reveal emerging activities in chromosome alignment, chromosome segregation and abscission during cell division. Defects in these activities result in numerical chromosomal aberrations. In addition to BRCA2, other factors of the DNA damage response (DDR) participate in mitosis in close association with cell cycle kinases and phosphatases suggesting that the maintenance of genome integrity functions of these factors extends beyond DNA repair. Here we will discuss the regulation of BRCA2 functions through phosphorylation by cell cycle kinases particularly in mitosis, and illustrate with some examples how BRCA2 and other DDR proteins partially rewire their interactions, essentially via phosphorylation, to fulfill mitotic specific functions that ensure chromosome stability.
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Affiliation(s)
- Åsa Ehlén
- Institut Curie, PSL University, CNRS, UMR3348, Orsay, France
- Paris-Saclay University CNRS, UMR3348, Orsay, France
| | - Gaetana Sessa
- Institut Curie, PSL University, CNRS, UMR3348, Orsay, France
- Paris-Saclay University CNRS, UMR3348, Orsay, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Aura Carreira
- Institut Curie, PSL University, CNRS, UMR3348, Orsay, France
- Paris-Saclay University CNRS, UMR3348, Orsay, France
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13
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Marcelot A, Worman HJ, Zinn-Justin S. Protein structural and mechanistic basis of progeroid laminopathies. FEBS J 2020; 288:2757-2772. [PMID: 32799420 DOI: 10.1111/febs.15526] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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: 05/23/2020] [Accepted: 07/30/2020] [Indexed: 12/14/2022]
Abstract
Progeroid laminopathies are characterized by the premature appearance of certain signs of physiological aging in a subset of tissues. They are caused by mutations in genes coding for A-type lamins or lamin-binding proteins. Here, we review how different mutations causing progeroid laminopathies alter protein structure or protein-protein interactions and how these impact on mechanisms that protect cell viability and function. One group of progeroid laminopathies, which includes Hutchinson-Gilford progeria syndrome, is characterized by accumulation of unprocessed prelamin A or variants. These are caused by mutations in the A-type lamin gene (LMNA), altering prelamin A itself, or in ZMPSTE24, encoding an endoprotease involved in its processing. The abnormally expressed farnesylated proteins impact on various cellular processes that may contribute to progeroid phenotypes. Other LMNA mutations lead to the production of nonfarnesylated A-type lamin variants with amino acid substitutions in solvent-exposed hot spots located mainly in coil 1B and the immunoglobulin fold domain. Dominant missense mutations might reinforce interactions between lamin domains, thus giving rise to excessively stabilized filament networks. Recessive missense mutations in A-type lamins and barrier-to-autointegration factor (BAF) causing progeroid disorders are found at the interface between these interacting proteins. The amino acid changes decrease the binding affinity of A-type lamins for BAF, which may contribute to lamina disorganization, as well as defective repair of mechanically induced nuclear envelope rupture. Targeting these molecular alterations in A-type lamins and associated proteins identified through structural biology studies could facilitate the design of therapeutic strategies to treat patients with rare but severe progeroid laminopathies.
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Affiliation(s)
- Agathe Marcelot
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Uni Paris-Sud, Uni Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Howard J Worman
- Department of Medicine and Department of Pathology and Cell Biology, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY, USA
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Uni Paris-Sud, Uni Paris-Saclay, Gif-sur-Yvette Cedex, France
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14
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Aráoz R, Barnes P, Séchet V, Delepierre M, Zinn-Justin S, Molgó J, Zakarian A, Hess P, Servent D. Cyclic imine toxins survey in coastal european shellfish samples: Bioaccumulation and mode of action of 28-O-palmitoyl ester of pinnatoxin-G. first report of portimine-A bioaccumulation. Harmful Algae 2020; 98:101887. [PMID: 33129465 PMCID: PMC7657664 DOI: 10.1016/j.hal.2020.101887] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 07/11/2020] [Accepted: 07/24/2020] [Indexed: 05/12/2023]
Abstract
Cyclic imine toxins exhibit fast acting neurotoxicity and lethality by respiratory arrest in mice explained by their potent antagonistic activity against muscular nicotinic acetylcholine receptors. We performed a survey of gymnodimine-A, 13-desmethyl spirolide-C, 13,19-didesmethyl spirolide-C, 20-methyl spirolide-G, pinnatoxin-A, pinnatoxin-G, portimine-A and 28-O-palmitoyl ester of pinnatoxin-G in 36 shellfish samples collected in coastal areas of 8 European countries using a microplate receptor binding assay and UPLC-MS/MS for toxin identification and quantification. The major toxins found in these samples were pinnatoxin-G, 20-methyl spirolide-G, 13-desmethyl spirolide-C, gymnodimine-A and portimine-A. Traces of 13,19-didesmethyl spirolide-C, pinnatoxin-A and 28-O-palmitoyl ester of pinnatoxin-G were also detected. The rapid death of mice was correlated with higher pinnatoxin-G concentrations in mussel digestive gland extracts injected intraperitoneally. Our survey included nontoxic control samples that were found to contain moderate to trace amounts of several cyclic imine toxins. Shellfish may bioaccumulate not only cyclic imine toxins but also a large number of acyl derivatives as a product of metabolic transformation of these neurotoxins. This is the first report in which portimine-A and 28-O-palmitoyl ester of pinnatoxin-G were detected in shellfish extracts from digestive glands of mussels collected in Ingril lagoon. The bioaccumulation of portimine-A is particularly of concern because it is cytotoxic and is able to induce apotosis. The mode of action of 28-O-palmitoyl ester of pinnatoxin-G was studied by receptor binding-assay and by two-electrode voltage clamp electrophysiology. The antagonistic behavior of the acylated pinnatoxin-G towards nicotinic acetylcholine receptor of muscle type is shown here for the first time. Since cyclic imine toxins are not regulated further monitoring of these emerging toxins is needed to improve evidence gathering of their occurrence in shellfish commercialized for human consumption in Europe given their potent antagonism against muscle and neuronal nicotinic acetylcholine receptors.
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Affiliation(s)
- Rómulo Aráoz
- Université Paris Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), SIMoS, 91191 Gif-sur-Yvette, France; CNRS, ERL9004, 91191, Gif-sur-Yvette, France.
| | - Paul Barnes
- Agri-food and Biosciences Institute, Veterinary Science Division, Stoney Road, Belfast BT4 3SD, Northern Ireland, United Kingdom
| | - Véronique Séchet
- Ifremer, Centre Atlantique, Laboratoire Phycotoxines, 44311 Nantes Cedex, France
| | - Muriel Delepierre
- Institut Pasteur, Department of Structural Biology and Chemistry CNRS, UMR3528, Paris France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif- sur -Yvette Cedex, France
| | - Jordi Molgó
- Université Paris Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), SIMoS, 91191 Gif-sur-Yvette, France; CNRS, ERL9004, 91191, Gif-sur-Yvette, France
| | - Armen Zakarian
- University California Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 United States
| | - Philipp Hess
- Ifremer, Centre Atlantique, Laboratoire Phycotoxines, 44311 Nantes Cedex, France
| | - Denis Servent
- Université Paris Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), SIMoS, 91191 Gif-sur-Yvette, France; CNRS, ERL9004, 91191, Gif-sur-Yvette, France
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15
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Ehlén Å, Martin C, Miron S, Julien M, Theillet FX, Ropars V, Sessa G, Beaurepere R, Boucherit V, Duchambon P, El Marjou A, Zinn-Justin S, Carreira A. Proper chromosome alignment depends on BRCA2 phosphorylation by PLK1. Nat Commun 2020; 11:1819. [PMID: 32286328 PMCID: PMC7156385 DOI: 10.1038/s41467-020-15689-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 03/20/2020] [Indexed: 12/18/2022] Open
Abstract
The BRCA2 tumor suppressor protein is involved in the maintenance of genome integrity through its role in homologous recombination. In mitosis, BRCA2 is phosphorylated by Polo-like kinase 1 (PLK1). Here we describe how this phosphorylation contributes to the control of mitosis. We identify a conserved phosphorylation site at T207 of BRCA2 that constitutes a bona fide docking site for PLK1 and is phosphorylated in mitotic cells. We show that BRCA2 bound to PLK1 forms a complex with the phosphatase PP2A and phosphorylated-BUBR1. Reducing BRCA2 binding to PLK1, as observed in BRCA2 breast cancer variants S206C and T207A, alters the tetrameric complex resulting in unstable kinetochore-microtubule interactions, misaligned chromosomes, faulty chromosome segregation and aneuploidy. We thus reveal a role of BRCA2 in the alignment of chromosomes, distinct from its DNA repair function, with important consequences on chromosome stability. These findings may explain in part the aneuploidy observed in BRCA2-mutated tumors.
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Affiliation(s)
- Åsa Ehlén
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, F-91405, Orsay, France
| | - Charlotte Martin
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, F-91405, Orsay, France
| | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, Cedex, France
| | - Manon Julien
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, Cedex, France
- Department of Biology, École Normale Supérieure, 94230, Cachan, France
| | - François-Xavier Theillet
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, Cedex, France
| | - Virginie Ropars
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, Cedex, France
| | - Gaetana Sessa
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, F-91405, Orsay, France
| | - Romane Beaurepere
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, F-91405, Orsay, France
| | - Virginie Boucherit
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, F-91405, Orsay, France
| | - Patricia Duchambon
- Protein Expression and Purification Core Facility, Institut Curie, 26 rue d'Ulm, 75248, Paris, Cedex 05, France
- INSERM U1196, 91405, Orsay, Cedex, France
| | - Ahmed El Marjou
- Protein Expression and Purification Core Facility, Institut Curie, 26 rue d'Ulm, 75248, Paris, Cedex 05, France
- CNRS UMR144, 12 rue Lhomond, 75005, Paris, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette, Cedex, France.
| | - Aura Carreira
- Institut Curie, PSL Research University, CNRS, UMR3348, F-91405, Orsay, France.
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, F-91405, Orsay, France.
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16
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Julien M, Miron S, Carreira A, Theillet FX, Zinn-Justin S. 1H, 13C and 15N backbone resonance assignment of the human BRCA2 N-terminal region. Biomol NMR Assign 2020; 14:79-85. [PMID: 31900740 DOI: 10.1007/s12104-019-09924-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 12/20/2019] [Indexed: 06/10/2023]
Abstract
The Breast Cancer susceptibility protein 2 (BRCA2) is involved in mechanisms that maintain genome stability, including DNA repair, replication and cell division. These functions are ensured by the folded C-terminal DNA binding domain of BRCA2 but also by its large regions predicted to be disordered. Several studies have shown that disordered regions of BRCA2 are subjected to phosphorylation, thus regulating BRCA2 interactions through the cell cycle. The N-terminal region of BRCA2 contains two highly conserved clusters of phosphorylation sites between amino acids 75 and 210. Upon phosphorylation by CDK, the cluster 1 is known to become a docking site for the kinase PLK1. The cluster 2 is phosphorylated by PLK1 at least at two positions. Both of these phosphorylation clusters are important for mitosis progression, in particular for chromosome segregation and cytokinesis. In order to identify the phosphorylated residues and to characterize the phosphorylation sites preferences and their functional consequences within BRCA2 N-terminus, we have produced and analyzed the BRCA2 fragment from amino acid 48 to amino acid 284 (BRCA248-284). Here, we report the assignment of 1H, 15N, 13CO, 13Cα and 13Cβ NMR chemical shifts of this region. Analysis of these chemical shifts confirmed that BRCA248-284 shows no stable fold: it is intrinsically disordered, with only short, transient α-helices.
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Affiliation(s)
- Manon Julien
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, 91405, Orsay, France
| | - Simona Miron
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Aura Carreira
- Paris Sud University, Paris-Saclay University CNRS, UMR3348, 91405, Orsay, France
- Institut Curie, PSL Research University, UMR3348, 91405, Orsay, France
- CNRS, UMR3348, 91405, Orsay, France
| | - François-Xavier Theillet
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette Cedex, France.
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17
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Abstract
In line with their high accessibility, disordered proteins are exquisite targets of kinases. Eukaryotic organisms use the so-called intrinsically disordered proteins (IDPs) or intrinsically disordered regions of proteins (IDRs) as molecular switches carrying intracellular information tuned by reversible phosphorylation schemes. Solvent-exposed serines and threonines are abundant in IDPs, and, consistently, kinases often modify disordered regions of proteins at multiple sites. In this context, nuclear magnetic resonance (NMR) spectroscopy provides quantitative, residue-specific information that permits mapping of phosphosites and monitoring of their individual kinetics. Hence, NMR monitoring emerges as an in vitro approach, complementary to mass-spectrometry or immuno-blotting, to characterize IDP phosphorylation comprehensively. Here, we describe in detail generic protocols for carrying out NMR monitoring of IDP phosphorylation, and we provide a number of practical insights that improve handiness and reproducibility of this method.
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Affiliation(s)
- Manon Julien
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91198, France
| | - Chafiaa Bouguechtouli
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91198, France
| | - Ania Alik
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91198, France
| | - Rania Ghouil
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91198, France
| | - Sophie Zinn-Justin
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91198, France
| | - François-Xavier Theillet
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, 91198, France.
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18
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Samson C, Petitalot A, Celli F, Herrada I, Ropars V, Le Du MH, Nhiri N, Jacquet E, Arteni AA, Buendia B, Zinn-Justin S. Structural analysis of the ternary complex between lamin A/C, BAF and emerin identifies an interface disrupted in autosomal recessive progeroid diseases. Nucleic Acids Res 2019; 46:10460-10473. [PMID: 30137533 PMCID: PMC6212729 DOI: 10.1093/nar/gky736] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 08/02/2018] [Indexed: 01/22/2023] Open
Abstract
Lamins are the main components of the nucleoskeleton. Whereas their 3D organization was recently described using cryoelectron tomography, no structural data highlights how they interact with their partners at the interface between the inner nuclear envelope and chromatin. A large number of mutations causing rare genetic disorders called laminopathies were identified in the C-terminal globular Igfold domain of lamins A and C. We here present a first structural description of the interaction between the lamin A/C immunoglobulin-like domain and emerin, a nuclear envelope protein. We reveal that this lamin A/C domain both directly binds self-assembled emerin and interacts with monomeric emerin LEM domain through the dimeric chromatin-associated Barrier-to-Autointegration Factor (BAF) protein. Mutations causing autosomal recessive progeroid syndromes specifically impair proper binding of lamin A/C domain to BAF, thus destabilizing the link between lamin A/C and BAF in cells. Recent data revealed that, during nuclear assembly, BAF’s ability to bridge distant DNA sites is essential for guiding membranes to form a single nucleus around the mitotic chromosome ensemble. Our results suggest that BAF interaction with lamin A/C also plays an essential role, and that mutations associated with progeroid syndromes leads to a dysregulation of BAF-mediated chromatin organization and gene expression.
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Affiliation(s)
- Camille Samson
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Ambre Petitalot
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Florian Celli
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Isaline Herrada
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Virginie Ropars
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Marie-Hélène Le Du
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Naïma Nhiri
- Institut de Chimie des Substances Naturelles, Université Paris Sud, Université Paris-Saclay, CNRS UPR 2301, Gif-sur-Yvette, France
| | - Eric Jacquet
- Institut de Chimie des Substances Naturelles, Université Paris Sud, Université Paris-Saclay, CNRS UPR 2301, Gif-sur-Yvette, France
| | - Ana-Andrea Arteni
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Brigitte Buendia
- Unité de Biologie Fonctionnelle et Adaptative (BFA), CNRS UMR 8251, Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Sophie Zinn-Justin
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Université Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
- To whom correspondence should be addressed. Tel: +33 169083026;
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19
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Celli F, Petitalot A, Samson C, Theillet FX, Zinn-Justin S. 1H, 13C and 15N backbone resonance assignment of the lamin C-terminal region specific to prelamin A. Biomol NMR Assign 2018; 12:225-229. [PMID: 29582385 DOI: 10.1007/s12104-018-9813-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 03/20/2018] [Indexed: 06/08/2023]
Abstract
Lamins are the main components of the nucleoskeleton. They form a protein meshwork that underlies the inner nuclear membrane. Mutations in the LMNA gene coding for A-type lamins (lamins A and C) cause a large panel of human diseases, referred to as laminopathies. These diseases include muscular dystrophies, lipodystrophies and premature aging diseases. Lamin A exhibits a C-terminal region that is different from lamin C and is post-translationally modified. It is produced as prelamin A and it is then farnesylated, cleaved, carboxymethylated and cleaved again in order to become mature lamin A. In patients with the severe Hutchinson-Gilford progeria syndrome, a specific single point mutation in LMNA leads to an aberrant splicing of the LMNA gene preventing the post-translational processing of prelamin A. This leads to the accumulation of a permanently farnesylated lamin A mutant lacking 50 amino acids named progerin. We here report the NMR 1H, 15N, 13CO, 13Cα and 13Cβ chemical shift assignment of the C-terminal region that is specific to prelamin A, from amino acid 567 to amino acid 664. We also report the NMR 1H, 15N, 13CO, 13Cα and 13Cβ chemical shift assignment of the C-terminal region of the progerin variant, from amino acid 567 to amino acid 614. Analysis of these chemical shift data confirms that both prelamin A and progerin C-terminal domains are largely disordered and identifies a common partially populated α-helix from amino acid 576 to amino acid 585. This helix is well conserved from fishes to mammals.
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Affiliation(s)
- Florian Celli
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Ambre Petitalot
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Camille Samson
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - François-Xavier Theillet
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Sophie Zinn-Justin
- Institut de Biologie Intégrative de la Cellule (I2BC), CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay, Gif-sur-Yvette, France.
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20
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Petitalot A, Dardillac E, Jacquet E, Nhiri N, Guirouilh-Barbat J, Julien P, Bouazzaoui I, Bonte D, Feunteun J, Schnell JA, Lafitte P, Aude JC, Noguès C, Rouleau E, Lidereau R, Lopez BS, Zinn-Justin S, Caputo SM. Combining Homologous Recombination and Phosphopeptide-binding Data to Predict the Impact of BRCA1 BRCT Variants on Cancer Risk. Mol Cancer Res 2018; 17:54-69. [PMID: 30257991 DOI: 10.1158/1541-7786.mcr-17-0357] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 02/07/2018] [Accepted: 09/11/2018] [Indexed: 11/16/2022]
Abstract
BRCA1 mutations have been identified that increase the risk of developing hereditary breast and ovarian cancers. Genetic screening is now offered to patients with a family history of cancer, to adapt their treatment and the management of their relatives. However, a large number of BRCA1 variants of uncertain significance (VUS) are detected. To better understand the significance of these variants, a high-throughput structural and functional analysis was performed on a large set of BRCA1 VUS. Information on both cellular localization and homology-directed DNA repair (HR) capacity was obtained for 78 BRCT missense variants in the UMD-BRCA1 database and measurement of the structural stability and phosphopeptide-binding capacities was performed for 42 mutated BRCT domains. This extensive and systematic analysis revealed that most characterized causal variants affect BRCT-domain solubility in bacteria and all impair BRCA1 HR activity in cells. Furthermore, binding to a set of 5 different phosphopeptides was tested: all causal variants showed phosphopeptide-binding defects and no neutral variant showed such defects. A classification is presented on the basis of mutated BRCT domain solubility, phosphopeptide-binding properties, and VUS HR capacity. These data suggest that HR-defective variants, which present, in addition, BRCT domains either insoluble in bacteria or defective for phosphopeptide binding, lead to an increased cancer risk. Furthermore, the data suggest that variants with a WT HR activity and whose BRCT domains bind with a WT affinity to the 5 phosphopeptides are neutral. The case of variants with WT HR activity and defective phosphopeptide binding should be further characterized, as this last functional defect might be sufficient per se to lead to tumorigenesis. IMPLICATIONS: The analysis of the current study on BRCA1 structural and functional defects on cancer risk and classification presented may improve clinical interpretation and therapeutic selection.
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Affiliation(s)
- Ambre Petitalot
- Service de Génétique, Département de Biologie des Tumeurs, Institut Curie, Paris, France.,Institut de Biologie Intégrative de la Cellule, CEA, CNRS, Université Paris Sud, UMR 9198, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Elodie Dardillac
- Institut Gustave Roussy, CNRS UMR 8200, Université Paris-Saclay, Villejuif, France.,Team labeled "Ligue 2014," Villejuif, France
| | - Eric Jacquet
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Naima Nhiri
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Josée Guirouilh-Barbat
- Institut Gustave Roussy, CNRS UMR 8200, Université Paris-Saclay, Villejuif, France.,Team labeled "Ligue 2014," Villejuif, France
| | - Patrick Julien
- Service de Génétique, Département de Biologie des Tumeurs, Institut Curie, Paris, France
| | - Isslam Bouazzaoui
- Institut de Biologie Intégrative de la Cellule, CEA, CNRS, Université Paris Sud, UMR 9198, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Dorine Bonte
- Institut Gustave Roussy, CNRS UMR 8200, Université Paris-Saclay, Villejuif, France
| | - Jean Feunteun
- Institut Gustave Roussy, CNRS UMR 8200, Université Paris-Saclay, Villejuif, France
| | - Jeff A Schnell
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Philippe Lafitte
- Service de Génétique, Département de Biologie des Tumeurs, Institut Curie, Paris, France
| | - Jean-Christophe Aude
- Institut de Biologie Intégrative de la Cellule, CEA, CNRS, Université Paris Sud, UMR 9198, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Catherine Noguès
- Service de Génétique, Département de Biologie des Tumeurs, Institut Curie, Paris, France
| | - Etienne Rouleau
- Service de Génétique, Département de Biologie des Tumeurs, Institut Curie, Paris, France
| | - Rosette Lidereau
- Service de Génétique, Département de Biologie des Tumeurs, Institut Curie, Paris, France
| | - Bernard S Lopez
- Institut Gustave Roussy, CNRS UMR 8200, Université Paris-Saclay, Villejuif, France.,Team labeled "Ligue 2014," Villejuif, France
| | - Sophie Zinn-Justin
- Institut de Biologie Intégrative de la Cellule, CEA, CNRS, Université Paris Sud, UMR 9198, Université Paris-Saclay, Gif-sur-Yvette, France.
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21
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Lallemand F, Petitalot A, Vacher S, de Koning L, Taouis K, Lopez BS, Zinn-Justin S, Dalla-Venezia N, Chemlali W, Schnitzler A, Lidereau R, Bieche I, Caputo SM. Involvement of the FOXO6 transcriptional factor in breast carcinogenesis. Oncotarget 2017; 9:7464-7475. [PMID: 29484124 PMCID: PMC5800916 DOI: 10.18632/oncotarget.23779] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 05/12/2017] [Accepted: 12/22/2017] [Indexed: 01/17/2023] Open
Abstract
In mammals, FOXO transcriptional factors form a family of four members (FOXO1, 3, 4, and 6) involved in the modulation proliferation, apoptosis, and carcinogenesis. The role of the FOXO family in breast cancer remains poorly elucidated. According to the cellular context and the stage of the disease, FOXOs can have opposite effects on carcinogenesis. To study the role of FOXOs in breast carcinogenesis in more detail, we examined their expression in normal tissues, breast cell lines, and a large series of breast tumours of human origin. We found a very low physiological level of FOXO6 expression in normal adult tissues and high levels of expression in foetal brain. FOXO gene expressions fluctuate specifically in breast cancer cells compared to normal cells, suggesting that these genes may have different roles in breast carcinogenesis. For the first time, we have shown that, among the various FOXO genes, only FOXO6 was frequently highly overexpressed in breast cell lines and tumours. We also found that inhibition of the endogenous expression of FOXO6 by a specific siRNA inhibited the growth of the human breast cell lines MDA-MB-468 and HCC-38. FACS and Western blot analysis showed that inhibition of endogenous expression of FOXO6 induced accumulation of cells in G0/G1 phase of the cell cycle, but not apoptosis. These results tend to demonstrate that the overexpression of the human FOXO6 gene that we highlighted in the breast tumors stimulates breast carcinogenesis by activating breast cancer cell proliferation.
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Affiliation(s)
- François Lallemand
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France
| | - Ambre Petitalot
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France.,Service de génétique, unité de génétique constitutionnelle, Institut Curie, Paris, France
| | - Sophie Vacher
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France
| | | | - Karim Taouis
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France
| | - Bernard S Lopez
- CNRS UMR 8200, Gustave Roussy Cancer Institute, Université Paris-Saclay, équipe labélisée par la Ligue contre le cancer, Villejuif, France
| | - Sophie Zinn-Justin
- Laboratoire de biologie structurale et radiobiologie, IBITEC-S (CEA) and I2BC (UMR 9198, CEA, CNRS, Univ. Paris South), Gif-sur-Yvette, France
| | - Nicole Dalla-Venezia
- Centre de Recherche en Cancérologie de Lyon (CRCL)/INSERM U1052-CNRS UMR5286, Lyon, France
| | - Walid Chemlali
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France
| | - Anne Schnitzler
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France
| | - Rosette Lidereau
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France
| | - Ivan Bieche
- Service de génétique, unité de pharmacogénomique, Institut Curie, Paris, France.,EA7331, Université Paris Descartes, Paris, France
| | - Sandrine M Caputo
- Service de génétique, unité de génétique constitutionnelle, Institut Curie, Paris, France
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22
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Zinke M, Fricke P, Samson C, Hwang S, Wall JS, Lange S, Zinn-Justin S, Lange A. Bacteriophage Tail-Tube Assembly Studied by Proton-Detected 4D Solid-State NMR. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706060] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Maximilian Zinke
- Department of Molecular Biophysics; Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP); Berlin Germany
| | - Pascal Fricke
- Department of Molecular Biophysics; Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP); Berlin Germany
| | - Camille Samson
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS; Université Paris-Sud, Université Paris-Saclay; Gif-sur-Yvette Cedex France
| | - Songhwan Hwang
- Department of Molecular Biophysics; Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP); Berlin Germany
| | | | - Sascha Lange
- Department of Molecular Biophysics; Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP); Berlin Germany
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS; Université Paris-Sud, Université Paris-Saclay; Gif-sur-Yvette Cedex France
| | - Adam Lange
- Department of Molecular Biophysics; Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP); Berlin Germany
- Institut für Biologie; Humboldt-Universität zu Berlin; Berlin Germany
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23
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Cuniasse P, Tavares P, Orlova EV, Zinn-Justin S. Structures of biomolecular complexes by combination of NMR and cryoEM methods. Curr Opin Struct Biol 2017; 43:104-113. [DOI: 10.1016/j.sbi.2016.12.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 11/08/2016] [Accepted: 12/13/2016] [Indexed: 11/28/2022]
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24
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Vernhes E, Renouard M, Gilquin B, Cuniasse P, Durand D, England P, Hoos S, Huet A, Conway JF, Glukhov A, Ksenzenko V, Jacquet E, Nhiri N, Zinn-Justin S, Boulanger P. High affinity anchoring of the decoration protein pb10 onto the bacteriophage T5 capsid. Sci Rep 2017; 7:41662. [PMID: 28165000 PMCID: PMC5292684 DOI: 10.1038/srep41662] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 12/20/2016] [Indexed: 12/14/2022] Open
Abstract
Bacteriophage capsids constitute icosahedral shells of exceptional stability that protect the viral genome. Many capsids display on their surface decoration proteins whose structure and function remain largely unknown. The decoration protein pb10 of phage T5 binds at the centre of the 120 hexamers formed by the major capsid protein. Here we determined the 3D structure of pb10 and investigated its capsid-binding properties using NMR, SAXS, cryoEM and SPR. Pb10 consists of an α-helical capsid-binding domain and an Ig-like domain exposed to the solvent. It binds to the T5 capsid with a remarkably high affinity and its binding kinetics is characterized by a very slow dissociation rate. We propose that the conformational exchange events observed in the capsid-binding domain enable rearrangements upon binding that contribute to the quasi-irreversibility of the pb10-capsid interaction. Moreover we show that pb10 binding is a highly cooperative process, which favours immediate rebinding of newly dissociated pb10 to the 120 hexamers of the capsid protein. In extreme conditions, pb10 protects the phage from releasing its genome. We conclude that pb10 may function to reinforce the capsid thus favouring phage survival in harsh environments.
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Affiliation(s)
- Emeline Vernhes
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
| | - Madalena Renouard
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
| | - Bernard Gilquin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
| | - Philippe Cuniasse
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
| | - Dominique Durand
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
| | - Patrick England
- Institut Pasteur, Biophysique Moléculaire, Citech, UMR 3528, Paris, France
| | - Sylviane Hoos
- Institut Pasteur, Biophysique Moléculaire, Citech, UMR 3528, Paris, France
| | - Alexis Huet
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - James F Conway
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Anatoly Glukhov
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Russia
| | - Vladimir Ksenzenko
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Russia
| | - Eric Jacquet
- Institut de Chimie des Substances Naturelles, Univ Paris-Sud, Université Paris-Saclay, CNRS UPR 2301, Gif-sur-Yvette, France
| | - Naïma Nhiri
- Institut de Chimie des Substances Naturelles, Univ Paris-Sud, Université Paris-Saclay, CNRS UPR 2301, Gif-sur-Yvette, France
| | - Sophie Zinn-Justin
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
| | - Pascale Boulanger
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ Paris-Sud, Université Paris-Saclay, Gif-sur-Yvette cedex, France
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25
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Samson C, Celli F, Hendriks K, Zinke M, Essawy N, Herrada I, Arteni AA, Theillet FX, Alpha-Bazin B, Armengaud J, Coirault C, Lange A, Zinn-Justin S. Emerin self-assembly mechanism: role of the LEM domain. FEBS J 2017; 284:338-352. [PMID: 27960036 DOI: 10.1111/febs.13983] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 11/18/2016] [Accepted: 12/05/2016] [Indexed: 01/01/2023]
Abstract
At the nuclear envelope, the inner nuclear membrane protein emerin contributes to the interface between the nucleoskeleton and the chromatin. Emerin is an essential actor of the nuclear response to a mechanical signal. Genetic defects in emerin cause Emery-Dreifuss muscular dystrophy. It was proposed that emerin oligomerization regulates nucleoskeleton binding, and impaired oligomerization contributes to the loss of function of emerin disease-causing mutants. We here report the first structural characterization of emerin oligomers. We identified an N-terminal emerin region from amino acid 1 to amino acid 132 that is necessary and sufficient for formation of long curvilinear filaments. In emerin monomer, this region contains a globular LEM domain and a fragment that is intrinsically disordered. Solid-state nuclear magnetic resonance analysis identifies the LEM β-fragment as part of the oligomeric structural core. However, the LEM domain alone does not self-assemble into filaments. Additional residues forming a β-structure are observed within the filaments that could correspond to the unstructured region in emerin monomer. We show that the delK37 mutation causing muscular dystrophy triggers LEM domain unfolding and increases emerin self-assembly rate. Similarly, inserting a disulfide bridge that stabilizes the LEM folded state impairs emerin N-terminal region self-assembly, whereas reducing this disulfide bridge triggers self-assembly. We conclude that the LEM domain, responsible for binding to the chromatin protein BAF, undergoes a conformational change during self-assembly of emerin N-terminal region. The consequences of these structural rearrangement and self-assembly events on emerin binding properties are discussed.
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Affiliation(s)
- Camille Samson
- Laboratory of Structural Biology and Radiobiology, Institute for Integrative Biology of the Cell (CEA, CNRS, University Paris South), University Paris-Saclay, Gif-sur-Yvette, France
| | - Florian Celli
- Laboratory of Structural Biology and Radiobiology, Institute for Integrative Biology of the Cell (CEA, CNRS, University Paris South), University Paris-Saclay, Gif-sur-Yvette, France
| | - Kitty Hendriks
- Department of Molecular Biophysics, Leibniz-Institut für Molekulare Pharmakologie, Berlin, Germany
| | - Maximilian Zinke
- Department of Molecular Biophysics, Leibniz-Institut für Molekulare Pharmakologie, Berlin, Germany
| | - Nada Essawy
- Center for Research in Myology (INSERM, CNRS), Université Pierre et Marie Curie Paris 06, Sorbonne Universités, France
| | - Isaline Herrada
- Laboratory of Structural Biology and Radiobiology, Institute for Integrative Biology of the Cell (CEA, CNRS, University Paris South), University Paris-Saclay, Gif-sur-Yvette, France
| | - Ana-Andreea Arteni
- Department of Structural Virology, Institute for Integrative Biology of the Cell (CEA, CNRS, University Paris South), University Paris-Saclay, Gif-sur-Yvette, France
| | - François-Xavier Theillet
- Laboratory of Structural Biology and Radiobiology, Institute for Integrative Biology of the Cell (CEA, CNRS, University Paris South), University Paris-Saclay, Gif-sur-Yvette, France
| | - Béatrice Alpha-Bazin
- Laboratory 'Innovative technologies for Detection and Diagnostics', Institute of Biology and Technology Saclay, CEA, Bagnols-sur-Cèze, France
| | - Jean Armengaud
- Laboratory 'Innovative technologies for Detection and Diagnostics', Institute of Biology and Technology Saclay, CEA, Bagnols-sur-Cèze, France
| | - Catherine Coirault
- Center for Research in Myology (INSERM, CNRS), Université Pierre et Marie Curie Paris 06, Sorbonne Universités, France
| | - Adam Lange
- Department of Molecular Biophysics, Leibniz-Institut für Molekulare Pharmakologie, Berlin, Germany.,Institut für Biologie, Humboldt-Universität zu Berlin, Germany
| | - Sophie Zinn-Justin
- Laboratory of Structural Biology and Radiobiology, Institute for Integrative Biology of the Cell (CEA, CNRS, University Paris South), University Paris-Saclay, Gif-sur-Yvette, France
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26
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Araye A, Goudet A, Barbier J, Pichard S, Baron B, England P, Pérez J, Zinn-Justin S, Chenal A, Gillet D. Correction: The Translocation Domain of Botulinum Neurotoxin A Moderates the Propensity of the Catalytic Domain to Interact with Membranes at Acidic pH. PLoS One 2016; 11:e0161743. [PMID: 27536888 PMCID: PMC4990288 DOI: 10.1371/journal.pone.0161743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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27
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Araye A, Goudet A, Barbier J, Pichard S, Baron B, England P, Pérez J, Zinn-Justin S, Chenal A, Gillet D. The Translocation Domain of Botulinum Neurotoxin A Moderates the Propensity of the Catalytic Domain to Interact with Membranes at Acidic pH. PLoS One 2016; 11:e0153401. [PMID: 27070312 PMCID: PMC4829238 DOI: 10.1371/journal.pone.0153401] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 03/29/2016] [Indexed: 01/23/2023] Open
Abstract
Botulinum neurotoxin A (BoNT/A) is composed of three domains: a catalytic domain (LC), a translocation domain (HN) and a receptor-binding domain (HC). Like most bacterial toxins BoNT/A is an amphitropic protein, produced in a soluble form that is able to interact, penetrate and/or cross a membrane to achieve its toxic function. During intoxication BoNT/A is internalized by the cell by receptor-mediated endocytosis. Then, LC crosses the membrane of the endocytic compartment and reaches the cytosol. This translocation is initiated by the low pH found in this compartment. It has been suggested that LC passes in an unfolded state through a transmembrane passage formed by HN. We report here that acidification induces no major conformational change in either secondary or tertiary structures of LC and HN of BoNT/A in solution. GdnHCl-induced denaturation experiments showed that the stability of LC and HN increases as pH drops, and that HN further stabilizes LC. Unexpectedly we found that LC has a high propensity to interact with and permeabilize anionic lipid bilayers upon acidification without the help of HN. This property is downplayed when LC is linked to HN. HN thus acts as a chaperone for LC by enhancing its stability but also as a moderator of the membrane interaction of LC.
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Affiliation(s)
- Anne Araye
- CEA, iBiTec-S/SIMOPRO, CEA-Saclay, Paris Saclay University, LabEx LERMIT, F-91191 Gif-sur-Yvette, France
| | - Amélie Goudet
- CEA, iBiTec-S/SIMOPRO, CEA-Saclay, Paris Saclay University, LabEx LERMIT, F-91191 Gif-sur-Yvette, France
| | - Julien Barbier
- CEA, iBiTec-S/SIMOPRO, CEA-Saclay, Paris Saclay University, LabEx LERMIT, F-91191 Gif-sur-Yvette, France
| | - Sylvain Pichard
- CEA, iBiTec-S/SIMOPRO, CEA-Saclay, Paris Saclay University, LabEx LERMIT, F-91191 Gif-sur-Yvette, France
| | - Bruno Baron
- Institut Pasteur, Proteopole, Plateforme de Biophysique des Macromolécules et de leurs Interactions (PFBMI), 25–28 rue du Dr Roux, F-75724 Paris cedex 15, France
| | - Patrick England
- Institut Pasteur, Proteopole, Plateforme de Biophysique des Macromolécules et de leurs Interactions (PFBMI), 25–28 rue du Dr Roux, F-75724 Paris cedex 15, France
| | - Javier Pérez
- Synchrotron Soleil, BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | | | - Alexandre Chenal
- Institut Pasteur, Unité de Biochimie des Interactions Macromoléculaires, UMR 3528, 25–28 rue du Dr Roux, F-75724 Paris cedex 15, France
| | - Daniel Gillet
- CEA, iBiTec-S/SIMOPRO, CEA-Saclay, Paris Saclay University, LabEx LERMIT, F-91191 Gif-sur-Yvette, France
- * E-mail:
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28
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Samson C, Herrada I, Celli F, Theillet FX, Zinn-Justin S. 1H, 13C and 15N backbone resonance assignment of the intrinsically disordered region of the nuclear envelope protein emerin. Biomol NMR Assign 2016; 10:179-182. [PMID: 26725056 DOI: 10.1007/s12104-015-9662-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Accepted: 12/28/2015] [Indexed: 06/05/2023]
Abstract
Human emerin is an inner nuclear membrane protein involved in the response of the nucleus to mechanical stress. It contributes to the physical connection between the cytoskeleton and the nucleoskeleton. It is also involved in chromatin organization. Its N-terminal region is nucleoplasmic and comprises a globular LEM domain from residue 1 to residue 43. The three-dimensional structure of this LEM domain in complex with the chromatin BAF protein was solved from NMR data. Apart from the LEM domain, the nucleoplasmic region of emerin, from residue 44 to residue 221, is predicted to be intrinsically disordered. Mutations in this region impair binding to several emerin partners as lamin A, actin or HDAC3. However the molecular details of these recognition defects are unknown. Here we report (1)H, (15)N, (13)CO, (13)Cα and (13)Cβ NMR chemical shift assignments of the emerin fragment from residue 67 to residue 170, which is sufficient for nuclear localization and involved in lamin A binding. Chemical shift analysis confirms that this fragment is intrinsically disordered in 0 and 8 M urea.
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Affiliation(s)
- Camille Samson
- Laboratoire de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CNRS, Univ. Paris South and IBITECS CEA, CEA Saclay Bât. 144, 91191, Gif-sur-Yvette Cedex, France
| | - Isaline Herrada
- Laboratoire de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CNRS, Univ. Paris South and IBITECS CEA, CEA Saclay Bât. 144, 91191, Gif-sur-Yvette Cedex, France
| | - Florian Celli
- Laboratoire de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CNRS, Univ. Paris South and IBITECS CEA, CEA Saclay Bât. 144, 91191, Gif-sur-Yvette Cedex, France
| | - Francois-Xavier Theillet
- Laboratoire de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CNRS, Univ. Paris South and IBITECS CEA, CEA Saclay Bât. 144, 91191, Gif-sur-Yvette Cedex, France
- Department of NMR-assisted Structural Biology, Leibniz-Institut für Molekular Pharmakologie (FMP), 13125, Berlin, Germany
| | - Sophie Zinn-Justin
- Laboratoire de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CNRS, Univ. Paris South and IBITECS CEA, CEA Saclay Bât. 144, 91191, Gif-sur-Yvette Cedex, France.
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29
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Herrada I, Samson C, Velours C, Renault L, Östlund C, Chervy P, Puchkov D, Worman HJ, Buendia B, Zinn-Justin S. Muscular Dystrophy Mutations Impair the Nuclear Envelope Emerin Self-assembly Properties. ACS Chem Biol 2015; 10:2733-42. [PMID: 26415001 DOI: 10.1021/acschembio.5b00648] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
More than 100 genetic mutations causing X-linked Emery-Dreifuss muscular dystrophy have been identified in the gene encoding the integral inner nuclear membrane protein emerin. Most mutations are nonsense or frameshift mutations that lead to the absence of emerin in cells. Only very few cases are due to missense or short in-frame deletions. Molecular mechanisms explaining the corresponding emerin variants' loss of function are particularly difficult to identify because of the mostly intrinsically disordered state of the emerin nucleoplasmic region. We now demonstrate that this EmN region can be produced as a disordered monomer, as revealed by nuclear magnetic resonance, but rapidly self-assembles in vitro. Increases in concentration and temperature favor the formation of long curvilinear filaments with diameters of approximately 10 nm, as observed by electron microscopy. Assembly of these filaments can be followed by fluorescence through Thioflavin-T binding and by Fourier-transform Infrared spectrometry through formation of β-structures. Analysis of the assembly properties of five EmN variants reveals that del95-99 and Q133H impact filament assembly capacities. In cells, these variants are located at the nuclear envelope, but the corresponding quantities of emerin-emerin and emerin-lamin proximities are decreased compared to wild-type protein. Furthermore, variant P183H favors EmN aggregation in vitro, and variant P183T provokes emerin accumulation in cytoplasmic foci in cells. Substitution of residue Pro183 might systematically favor oligomerization, leading to emerin aggregation and mislocalization in cells. Our results suggest that emerin self-assembly is necessary for its proper function and that a loss of either the protein itself or its ability to self-assemble causes muscular dystrophy.
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Affiliation(s)
- Isaline Herrada
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| | - Camille Samson
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| | - Christophe Velours
- Laboratoire
d’Enzymologie et Biochimie Structurales, Institute for Integrative Biology of the Cell (I2BC), CNRS Bât.34, 1 avenue de
la terrasse, 91190 Gif-sur-Yvette, France
| | - Louis Renault
- Laboratoire
d’Enzymologie et Biochimie Structurales, Institute for Integrative Biology of the Cell (I2BC), CNRS Bât.34, 1 avenue de
la terrasse, 91190 Gif-sur-Yvette, France
| | - Cecilia Östlund
- Department
of Medicine and Department of Pathology and Cell Biology, College
of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, United States
| | - Pierre Chervy
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
| | - Dmytro Puchkov
- Department
of Molecular Pharmacology and Cell Biology, Leibniz-Institut für Molecular Pharmakologie (FMP), 13125 Berlin, Germany
| | - Howard J Worman
- Department
of Medicine and Department of Pathology and Cell Biology, College
of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, United States
| | - Brigitte Buendia
- Laboratoire
de Physiologie du Muscle Strié, Université Paris Diderot-Paris 7, CNRS, UMR 8251, Institut de Biologie
Fonctionnelle et Adaptative, 4 rue
M.A. Lagroua Weill Halle, 75205 Paris Cedex 13, France
| | - Sophie Zinn-Justin
- Laboratoire
de Biologie Structurale et Radiobiologie, Institute for Integrative Biology of the Cell (I2BC), CEA Saclay Bât. 144, 91191 Gif-sur-Yvette Cedex, France
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30
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Herrada I, Zinn-Justin S. Emerin oligomerisation properties, impact on lamin and actin recognition. Orphanet J Rare Dis 2015. [PMCID: PMC4652573 DOI: 10.1186/1750-1172-10-s2-o17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
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31
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Langlois C, Ramboarina S, Cukkemane A, Auzat I, Chagot B, Gilquin B, Ignatiou A, Petitpas I, Kasotakis E, Paternostre M, White HE, Orlova EV, Baldus M, Tavares P, Zinn-Justin S. Bacteriophage SPP1 tail tube protein self-assembles into β-structure-rich tubes. J Biol Chem 2014; 290:3836-49. [PMID: 25525268 DOI: 10.1074/jbc.m114.613166] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 12/31/2022] Open
Abstract
The majority of known bacteriophages have long tails that serve for bacterial target recognition and viral DNA delivery into the host. These structures form a tube from the viral capsid to the bacterial cell. The tube is formed primarily by a helical array of tail tube protein (TTP) subunits. In phages with a contractile tail, the TTP tube is surrounded by a sheath structure. Here, we report the first evidence that a phage TTP, gp17.1 of siphophage SPP1, self-assembles into long tubes in the absence of other viral proteins. gp17.1 does not exhibit a stable globular structure when monomeric in solution, even if it was confidently predicted to adopt the β-sandwich fold of phage λ TTP. However, Fourier transform infrared and nuclear magnetic resonance spectroscopy analyses showed that its β-sheet content increases significantly during tube assembly, suggesting that gp17.1 acquires a stable β-sandwich fold only after self-assembly. EM analyses revealed that the tube is formed by hexameric rings stacked helicoidally with the same organization and helical parameters found for the tail of SPP1 virions. These parameters were used to build a pseudo-atomic model of the TTP tube. The large loop spanning residues 40-56 is located on the inner surface of the tube, at the interface between adjacent monomers and hexamers. In line with our structural predictions, deletion of this loop hinders gp17.1 tube assembly in vitro and interferes with SPP1 tail assembly during phage particle morphogenesis in bacteria.
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Affiliation(s)
- Chantal Langlois
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Stéphanie Ramboarina
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Abhishek Cukkemane
- the NMR Spectroscopy Group, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands, the Microbiology Department, Tuljaram Chaturchand College, Baramati-413102, India
| | - Isabelle Auzat
- the Unité de Virologie Moléculaire et Structurale, CNRS UPR3296, Centre de Recherche de Gif, Bâtiment 14B, CNRS, 91198 Gif-sur-Yvette, France, and
| | - Benjamin Chagot
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Bernard Gilquin
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Athanasios Ignatiou
- the Institute of Structural and Molecular Biology, Birkbeck College, London WC1E 7HX, United Kingdom
| | - Isabelle Petitpas
- the Unité de Virologie Moléculaire et Structurale, CNRS UPR3296, Centre de Recherche de Gif, Bâtiment 14B, CNRS, 91198 Gif-sur-Yvette, France, and
| | - Emmanouil Kasotakis
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Maïté Paternostre
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France
| | - Helen E White
- the Institute of Structural and Molecular Biology, Birkbeck College, London WC1E 7HX, United Kingdom
| | - Elena V Orlova
- the Institute of Structural and Molecular Biology, Birkbeck College, London WC1E 7HX, United Kingdom
| | - Marc Baldus
- the NMR Spectroscopy Group, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Paulo Tavares
- the Unité de Virologie Moléculaire et Structurale, CNRS UPR3296, Centre de Recherche de Gif, Bâtiment 14B, CNRS, 91198 Gif-sur-Yvette, France, and
| | - Sophie Zinn-Justin
- From the Laboratoire de Biologie Structurale et Radiobiologie, UMR CNRS 8221 and CEA IBITECS, Commissariat à l'Energie Atomique, Saclay 91191 Gif-sur-Yvette Cedex, France,
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Lopes A, Tavares P, Petit MA, Guérois R, Zinn-Justin S. Automated classification of tailed bacteriophages according to their neck organization. BMC Genomics 2014; 15:1027. [PMID: 25428721 PMCID: PMC4362835 DOI: 10.1186/1471-2164-15-1027] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 10/29/2014] [Indexed: 11/12/2022] Open
Abstract
Background The genetic diversity observed among bacteriophages remains a major obstacle for the identification of homologs and the comparison of their functional modules. In the structural module, although several classes of homologous proteins contributing to the head and tail structure can be detected, proteins of the head-to-tail connection (or neck) are generally more divergent. Yet, molecular analyses of a few tailed phages belonging to different morphological classes suggested that only a limited number of structural solutions are used in order to produce a functional virion. To challenge this hypothesis and analyze proteins diversity at the virion neck, we developed a specific computational strategy to cope with sequence divergence in phage proteins. We searched for homologs of a set of proteins encoded in the structural module using a phage learning database. Results We show that using a combination of iterative profile-profile comparison and gene context analyses, we can identify a set of head, neck and tail proteins in most tailed bacteriophages of our database. Classification of phages based on neck protein sequences delineates 4 Types corresponding to known morphological subfamilies. Further analysis of the most abundant Type 1 yields 10 Clusters characterized by consistent sets of head, neck and tail proteins. We developed Virfam, a webserver that automatically identifies proteins of the phage head-neck-tail module and assign phages to the most closely related cluster of phages. This server was tested against 624 new phages from the NCBI database. 93% of the tailed and unclassified phages could be assigned to our head-neck-tail based categories, thus highlighting the large representativeness of the identified virion architectures. Types and Clusters delineate consistent subgroups of Caudovirales, which correlate with several virion properties. Conclusions Our method and webserver have the capacity to automatically classify most tailed phages, detect their structural module, assign a function to a set of their head, neck and tail genes, provide their morphologic subtype and localize these phages within a “head-neck-tail” based classification. It should enable analysis of large sets of phage genomes. In particular, it should contribute to the classification of the abundant unknown viruses found on assembled contigs of metagenomic samples. Electronic supplementary material The online version of this article (doi:10.1186/1471-2164-15-1027) contains supplementary material, which is available to authorized users.
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Maisonneuve P, Caillet-Saguy C, Raynal B, Gilquin B, Chaffotte A, Pérez J, Zinn-Justin S, Delepierre M, Buc H, Cordier F, Wolff N. Regulation of the catalytic activity of the human phosphatase PTPN4 by its PDZ domain. FEBS J 2014; 281:4852-65. [PMID: 25158884 DOI: 10.1111/febs.13024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 07/02/2014] [Accepted: 08/20/2014] [Indexed: 01/08/2023]
Abstract
The human protein tyrosine phosphatase non-receptor type 4 (PTPN4) prevents cells death. Targeting its PDZ domain abrogates this protection and triggers apoptosis. We demonstrate here that the PDZ domain inhibits the phosphatase activity of PTPN4. The mere binding of a PDZ ligand is sufficient to release the catalytic inhibition. We combined analytical ultracentrifugation, small angle X-ray scattering and NMR to understand how the PDZ domain controls PTPN4 activity. We show that the physiologically active PTPN4 two-domain, encompassing the PDZ and the phosphatase domains, adopts a predominant compact conformation in solution. The PDZ ligand binding restores the catalytic competence of PTPN4 disrupting the transient interdomain communication. This study strengthens the emerging notion that PDZ domains can act as regulators of enzyme activity and therefore are active players in the dynamic regulation of signaling pathways.
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Affiliation(s)
- Pierre Maisonneuve
- Département de Biologie Structurale et Chimie, Unité de Résonance Magnétique Nucléaire des Biomolécules, Institut Pasteur, Paris, France; Université Pierre et Marie Curie, Cellule Pasteur UPMC, Paris, France
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Bourgeois B, Gilquin B, Tellier-Lebègue C, Östlund C, Wu W, Pérez J, El Hage P, Lallemand F, Worman HJ, Zinn-Justin S. Inhibition of TGF-β signaling at the nuclear envelope: characterization of interactions between MAN1, Smad2 and Smad3, and PPM1A. Sci Signal 2013; 6:ra49. [PMID: 23779087 DOI: 10.1126/scisignal.2003411] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Signaling by transforming growth factor-β (TGF-β) is critical for various developmental processes and culminates in the activation of the transcription factors Smad2 and Smad3. MAN1, an integral protein of the inner nuclear membrane, inhibits TGF-β signaling by binding to Smad2 and Smad3. Depletion of the gene LEMD3 encoding MAN1 leads to developmental anomalies in mice, and heterozygous loss-of-function mutations in LEMD3 in humans cause sclerosing bone dysplasia. We modeled the three-dimensional structure of the MAN1-Smad2 complex from nuclear magnetic resonance and small-angle x-ray scattering data. As predicted by this model, we found that MAN1 competed in vitro and in cells with the transcription factor FAST1 (forkhead activin signal transducer 1) for binding to Smad2. The model further predicted that MAN1 bound to activated Smad2-Smad4 or Smad3-Smad4 complexes, which was confirmed by in vitro experiments; however, in cells, MAN1 bound only to Smad2 and Smad3 and not to the Smad4-containing complexes. Overexpression of MAN1 led to dephosphorylation of Smad2 and Smad3, thus hindering their recognition by Smad4, and MAN1 bound directly in vitro to the phosphatase PPM1A, which catalyzes the dephosphorylation of Smad2/3. These results demonstrate a nuclear envelope-localized mechanism of inactivating TGF-β signaling in which MAN1 competes with transcription factors for binding to Smad2 and Smad3 and facilitates their dephosphorylation by PPM1A.
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Affiliation(s)
- Benjamin Bourgeois
- Laboratoire de Biologie Structurale et Radiobiologie, URA CNRS 2096, CEA Saclay, 91190 Gif-sur-Yvette, France
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Matot B, Le Bihan YV, Lescasse R, Pérez J, Miron S, David G, Castaing B, Weber P, Raynal B, Zinn-Justin S, Gasparini S, Le Du MH. The orientation of the C-terminal domain of the Saccharomyces cerevisiae Rap1 protein is determined by its binding to DNA. Nucleic Acids Res 2012; 40:3197-207. [PMID: 22139930 PMCID: PMC3326314 DOI: 10.1093/nar/gkr1166] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Revised: 11/10/2011] [Accepted: 11/11/2011] [Indexed: 11/22/2022] Open
Abstract
Rap1 is an essential DNA-binding factor from the yeast Saccharomyces cerevisiae involved in transcription and telomere maintenance. Its binding to DNA targets Rap1 at particular loci, and may optimize its ability to form functional macromolecular assemblies. It is a modular protein, rich in large potentially unfolded regions, and comprising BRCT, Myb and RCT well-structured domains. Here, we present the architectures of Rap1 and a Rap1/DNA complex, built through a step-by-step integration of small angle X-ray scattering, X-ray crystallography and nuclear magnetic resonance data. Our results reveal Rap1 structural adjustment upon DNA binding that involves a specific orientation of the C-terminal (RCT) domain with regard to the DNA binding domain (DBD). Crystal structure of DBD in complex with a long DNA identifies an essential wrapping loop, which constrains the orientation of the RCT and affects Rap1 affinity to DNA. Based on our structural information, we propose a model for Rap1 assembly at telomere.
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Affiliation(s)
- Béatrice Matot
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Yann-Vaï Le Bihan
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Rachel Lescasse
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Javier Pérez
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Simona Miron
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Gabriel David
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Bertrand Castaing
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Patrick Weber
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Bertrand Raynal
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Sophie Zinn-Justin
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Sylvaine Gasparini
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
| | - Marie-Hélène Le Du
- Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Biologie et Technologie de Saclay, Laboratoire de Biologie Structurale et Radiobiologie, CNRS-URA2096, 91191 Gif-sur-Yvette, France, Commissariat à l'Energie Atomique, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Service Instabilité Génétique Réparation et Recombinaison, Laboratoire Télomère et Réparation du Chromosome, 92260 Fontenay-aux-roses, SOLEIL Synchrotron, L'Orme des Merisiers Saint-Aubin, Gif-sur-Yvette, Centre de Biophysique Moléculaire, UPR4301, CNRS, rue Charles Sadron, 45071 Orléans cedex 02, Institut Pasteur, CNRS-URA2185, Plate-forme 6, Cristallogenèse et Diffraction des Rayons X, 25 Rue Dr. Roux, 75724 Paris and Institut Pasteur, Plateforme de Biophysique des Macromolécules et de leurs Interactions, Département de Biologie Structurale et Chimie, F-75015 Paris, France
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Abstract
Tailed bacteriophages use a portal system for genome entry and exit from viral capsids. Here, we review the mechanisms how these movements are controlled by the genome gatekeeper that assembles at the portal structure. Phage DNA is packaged at high pressure inside the viral capsid by a powerful motor. The viral genome is translocated through the central channel of the portal protein found at a single vertex of the capsid. Packaging is normally terminated by endonucleolytic cleavage of the substrate DNA followed by disassembly of the packaging motor and closure of the portal system, preventing leakage of the viral genome. This can be achieved either by conformational changes in the portal protein or by sequential addition of proteins that extend the portal channel (adaptors) and physically close it preventing DNA exit (stoppers). The resulting connector structure provides the interface for assembly of short tails (podoviruses) or for attachment of preformed long tails (siphoviruses and myoviruses). The connector maintains the viral DNA correctly positioned for ejection that is triggered by interaction of the phage particle with bacterial receptors. Recent exciting advances are providing new molecular insights on the mechanisms that ensure precise coordination of these critical steps required both for stable viral genome packaging and for its efficient release to initiate infection.
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Affiliation(s)
- Paulo Tavares
- Unité de Virologie Moléculaire et Structurale, Gif-sur-Yvette, France.
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37
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Chagot B, Auzat I, Gallopin M, Petitpas I, Gilquin B, Tavares P, Zinn-Justin S. Solution structure of gp17 from the Siphoviridae
bacteriophage SPP1: Insights into its role in virion assembly. Proteins 2011; 80:319-26. [DOI: 10.1002/prot.23191] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 09/02/2011] [Accepted: 09/07/2011] [Indexed: 01/08/2023]
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Duband-Goulet I, Woerner S, Gasparini S, Attanda W, Kondé E, Tellier-Lebègue C, Craescu CT, Gombault A, Roussel P, Vadrot N, Vicart P, Ostlund C, Worman HJ, Zinn-Justin S, Buendia B. Subcellular localization of SREBP1 depends on its interaction with the C-terminal region of wild-type and disease related A-type lamins. Exp Cell Res 2011; 317:2800-13. [PMID: 21993218 DOI: 10.1016/j.yexcr.2011.09.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 09/02/2011] [Accepted: 09/26/2011] [Indexed: 11/26/2022]
Abstract
Lamins A and C are nuclear intermediate filament proteins expressed in most differentiated somatic cells. Previous data suggested that prelamin A, the lamin A precursor, accumulates in some lipodystrophy syndromes caused by mutations in the lamin A/C gene, and binds and inactivates the sterol regulatory element binding protein 1 (SREBP1). Here we show that, in vitro, the tail regions of prelamin A, lamin A and lamin C bind a polypeptide of SREBP1. Such interactions also occur in HeLa cells, since expression of lamin tail regions impedes nucleolar accumulation of the SREBP1 polypeptide fused to a nucleolar localization signal sequence. In addition, the tail regions of A-type lamin variants that occur in Dunnigan-type familial partial lipodystrophy of (R482W) and Hutchison Gilford progeria syndrome (∆607-656) bind to the SREBP1 polypeptide in vitro, and the corresponding FLAG-tagged full-length lamin variants co-immunoprecipitate the SREBP1 polypeptide in cells. Overexpression of wild-type A-type lamins and variants favors SREBP1 polypeptide localization at the intranuclear periphery, suggesting its sequestration. Our data support the hypothesis that variation of A-type lamin protein level and spatial organization, in particular due to disease-linked mutations, influences the sequestration of SREBP1 at the nuclear envelope and thus contributes to the regulation of SREBP1 function.
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Affiliation(s)
- Isabelle Duband-Goulet
- Laboratoire du Stress et Pathologies du Cytosquelette, Université Paris Diderot-Paris 7, CNRS, Institut de Biologie Fonctionnelle et Adaptative, 4 rue M.A. Lagroua Weill Halle, 75205 Paris cedex 13, France
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Marquer C, Fruchart-Gaillard C, Letellier G, Marcon E, Mourier G, Zinn-Justin S, Ménez A, Servent D, Gilquin B. Structural model of ligand-G protein-coupled receptor (GPCR) complex based on experimental double mutant cycle data: MT7 snake toxin bound to dimeric hM1 muscarinic receptor. J Biol Chem 2011; 286:31661-75. [PMID: 21685390 DOI: 10.1074/jbc.m111.261404] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The snake toxin MT7 is a potent and specific allosteric modulator of the human M1 muscarinic receptor (hM1). We previously characterized by mutagenesis experiments the functional determinants of the MT7-hM1 receptor interaction (Fruchart-Gaillard, C., Mourier, G., Marquer, C., Stura, E., Birdsall, N. J., and Servent, D. (2008) Mol. Pharmacol. 74, 1554-1563) and more recently collected evidence indicating that MT7 may bind to a dimeric form of hM1 (Marquer, C., Fruchart-Gaillard, C., Mourier, G., Grandjean, O., Girard, E., le Maire, M., Brown, S., and Servent, D. (2010) Biol. Cell 102, 409-420). To structurally characterize the MT7-hM1 complex, we adopted a strategy combining double mutant cycle experiments and molecular modeling calculations. First, thirty-three ligand-receptor proximities were identified from the analysis of sixty-one double mutant binding affinities. Several toxin residues that are more than 25 Å apart still contact the same residues on the receptor. As a consequence, attempts to satisfy all the restraints by docking the toxin onto a single receptor failed. The toxin was then positioned onto two receptors during five independent flexible docking simulations. The different possible ligand and receptor extracellular loop conformations were described by performing simulations in explicit solvent. All the docking calculations converged to the same conformation of the MT7-hM1 dimer complex, satisfying the experimental restraints and in which (i) the toxin interacts with the extracellular side of the receptor, (ii) the tips of MT7 loops II and III contact one hM1 protomer, whereas the tip of loop I binds to the other protomer, and (iii) the hM1 dimeric interface involves the transmembrane helices TM6 and TM7. These results structurally support the high affinity and selectivity of the MT7-hM1 interaction and highlight the atypical mode of interaction of this allosteric ligand on its G protein-coupled receptor target.
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Affiliation(s)
- Catherine Marquer
- Laboratoire de Biologie Structurale et Radiobiologie, Service de Bioénergétique, Biologie Structurale et Mécanismes (SB2SM), CNRS Unité de Recherche Associée 2096, Gif sur Yvette F-91191, France
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Kondé E, Bourgeois B, Tellier-Lebegue C, Wu W, Pérez J, Caputo S, Attanda W, Gasparini S, Charbonnier JB, Gilquin B, Worman HJ, Zinn-Justin S. Structural analysis of the Smad2-MAN1 interaction that regulates transforming growth factor-β signaling at the inner nuclear membrane. Biochemistry 2010; 49:8020-32. [PMID: 20715792 DOI: 10.1021/bi101153w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
MAN1, an integral protein of the inner nuclear membrane, influences transforming growth factor-β (TGF-β) signaling by directly interacting with R-Smads. Heterozygous loss of function mutations in the gene encoding MAN1 cause sclerosing bone dysplasias and an increased level of TGF-β signaling in cells. As a first step in elucidating the mechanism of TGF-β pathway regulation by MAN1, we characterized the structure of the MAN1 C-terminal region that binds Smad2. Using nuclear magnetic resonance spectroscopy, we observed that this region is comprised of a winged helix domain, a structurally heterogeneous linker, a U2AF homology motif (UHM) domain, and a disordered C-terminus. From nuclear magnetic resonance and small-angle X-ray scattering data, we calculated a family of models for this MAN1 region. Our data indicate that the linker plays the role of an intramolecular UHM ligand motif (ULM) interacting with the UHM domain. We mapped the Smad2 binding site onto the MAN1 structure by combining GST pull-down, fluorescence, and yeast two-hybrid approaches. The linker region, the UHM domain, and the C-terminus are necessary for Smad2 binding with a micromolar affinity. Moreover, the intramolecular interaction between the linker and the UHM domain is critical for Smad2 binding. On the basis of the structural heterogeneity and binding properties of the linker, we suggest that it can interact with other UHM domains, thus regulating the MAN1-Smad2 interaction.
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Affiliation(s)
- Emilie Kondé
- Laboratoire de Biologie Structurale et Radiobiologie, URA CNRS 2096, CEA Saclay, 91190 Gif-sur-Yvette, France
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Gross G, Gallopin M, Vandame M, Couprie J, Stura E, Zinn-Justin S, Drevet P. Conformational exchange is critical for the productivity of an oxidative folding intermediate with buried free cysteines. J Mol Biol 2010; 403:299-312. [PMID: 20804768 DOI: 10.1016/j.jmb.2010.07.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 07/23/2010] [Accepted: 07/26/2010] [Indexed: 11/16/2022]
Abstract
Much has been learned about the folding of proteins from comparative studies of the folding of proteins that are related in sequence and structure. Observation of the effects of mutations helps account for sequence-specific properties and large variations in folding rates observed in homologous proteins, which are not explained by structure-derived descriptions. The folding kinetics of variants of a β-stranded protein, toxin α from Naja nigricollis, depends on the length of their loop lk1. These proteins, named Tox60, Tox61, and Tox62, contain four disulfide bonds. We show that their oxidative refolding pathways are similar. Differences in these pathways are restricted to the last step of the reaction, that is, the closure of the last disulfide. At this step, two species of three-disulfide intermediates are observed: intermediate C lacking the B3 disulfide and intermediate D lacking the B2 disulfide. Surprisingly, D is the most productive intermediate for Tox61 despite the low accessibility of its free cysteines. However, in the case of Tox62, its conversion efficiency drops by 2 orders of magnitude and C becomes the most productive intermediate. NMR was used in order to study the structural dynamics of each of these intermediates. Both three-disulfide intermediates of Tox61 exist in two forms, exchanging on the 1- to 100-ms scale. One of these forms is structurally very close to the native Tox61, whereas the other is always significantly more flexible on a picosecond-to-nanosecond timescale. On the other hand, in the case of Tox62, the three-disulfide intermediates only show a native-like structure. The higher conformational heterogeneity of Tox61 intermediate D allows an increased accessibility of its free cysteines to oxidative agents, which explains its faster native disulfide formation. Thus, residue deletion in loop lk1 probably abrogates stabilizing intramolecular interactions, creates conformational heterogeneity, and increases the folding rate of Tox60 and Tox61 compared to Tox62.
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Affiliation(s)
- Gregori Gross
- CEA/DSV/iBiTEC-S/SBIGeM, F-91191 Gif sur Yvette Cedex, France
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Verstraeten VLRM, Caputo S, van Steensel MAM, Duband-Goulet I, Zinn-Justin S, Kamps M, Kuijpers HJH, Ostlund C, Worman HJ, Briedé JJ, Le Dour C, Marcelis CLM, van Geel M, Steijlen PM, van den Wijngaard A, Ramaekers FCS, Broers JLV. The R439C mutation in LMNA causes lamin oligomerization and susceptibility to oxidative stress. J Cell Mol Med 2009; 13:959-71. [PMID: 19220582 PMCID: PMC3823411 DOI: 10.1111/j.1582-4934.2009.00690.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Dunnigan-type familial partial lipodystrophy (FPLD) is a laminopathy characterized by an aberrant fat distribution and a metabolic syndrome for which oxidative stress has recently been suggested as one of the disease-causing mechanisms. In a family affected with FPLD, we identified a heterozygous missense mutation c.1315C>T in the LMNA gene leading to the p.R439C substitution. Cultured patient fibroblasts do not show any prelamin A accumulation and reveal honeycomb-like lamin A/C formations in a significant percentage of nuclei. The mutation affects a region in the C-terminal globular domain of lamins A and C, different from the FPLD-related hot spot. Here, the introduction of an extra cysteine allows for the formation of disulphide-mediated lamin A/C oligomers. This oligomerization affects the interaction properties of the C-terminal domain with DNA as shown by gel retardation assays and causes a DNA-interaction pattern that is distinct from the classical R482W FPLD mutant. Particularly, whereas the R482W mutation decreases the binding efficiency of the C-terminal domain to DNA, the R439C mutation increases it. Electron spin resonance spectroscopy studies show significantly higher levels of reactive oxygen species (ROS) upon induction of oxidative stress in R439C patient fibroblasts compared to healthy controls. This increased sensitivity to oxidative stress seems independent of the oligomerization and enhanced DNA binding typical for R439C, as both the R439C and R482W mutants show a similar and significant increase in ROS upon induction of oxidative stress by H2O2.
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Laguri C, Duband-Goulet I, Friedrich N, Axt M, Belin P, Callebaut I, Gilquin B, Zinn-Justin S, Couprie J. Human mismatch repair protein MSH6 contains a PWWP domain that targets double stranded DNA. Biochemistry 2008; 47:6199-207. [PMID: 18484749 DOI: 10.1021/bi7024639] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The eukaryotic mismatch repair (MMR) protein MSH6 exhibits a core region structurally and functionally similar to bacterial MutS. However, it possesses an additional N-terminal region (NTR), comprising a PCNA binding motif, a large region of unknown function and a nonspecific DNA binding fragment. Yeast NTR was recently described as an extended tether between PCNA and the core of MSH6 . In contrast, we show that human NTR presents a globular PWWP domain in the region of unknown function. We demonstrate that this PWWP domain binds double-stranded DNA, without any preference for mismatches or nicks, whereas its apparent affinity for single-stranded DNA is about 20 times lower. The S144I mutation, which in human MSH6 causes inherited somatic defects in MMR resulting in increased development of hereditary non polyposis colorectal cancer , is located in the DNA binding surface of the PWWP domain. However, it only moderately affects domain stability, and it does not perturb DNA binding in vitro.
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Affiliation(s)
- Cédric Laguri
- CEA Laboratoire de Biologie Structurale et Radiobiologie, iBiTec-Saclay, 91191 Gif sur Yvette, France
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Carlier L, Couprie J, le Maire A, Guilhaudis L, Milazzo-Segalas I, Courçon M, Moutiez M, Gondry M, Davoust D, Gilquin B, Zinn-Justin S. Solution structure of the region 51-160 of human KIN17 reveals an atypical winged helix domain. Protein Sci 2008; 16:2750-5. [PMID: 18029424 DOI: 10.1110/ps.073079107] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Human KIN17 is a 45-kDa eukaryotic DNA- and RNA-binding protein that plays an important role in nuclear metabolism and in particular in the general response to genotoxics. Its amino acids sequence contains a zinc finger motif (residues 28-50) within a 30-kDa N-terminal region conserved from yeast to human, and a 15-kDa C-terminal tandem of SH3-like subdomains (residues 268-393) only found in higher eukaryotes. Here we report the solution structure of the region 51-160 of human KIN17. We show that this fragment folds into a three-alpha-helix bundle packed against a three-stranded beta-sheet. It belongs to the winged helix (WH) family. Structural comparison with analogous WH domains reveals that KIN17 WH module presents an additional and highly conserved 3(10)-helix. Moreover, KIN17 WH helix H3 is not positively charged as in classical DNA-binding WH domains. Thus, human KIN17 region 51-160 might rather be involved in protein-protein interaction through its conserved surface centered on the 3(10)-helix.
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Affiliation(s)
- Ludovic Carlier
- Equipe de Chimie Organique et Biologie Structurale, IFRMP 23, CNRS UMR 6014, Université de Rouen, 76821 Mont-Saint-Aignan, France
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Lancelot N, Charier G, Couprie J, Duband-Goulet I, Alpha-Bazin B, Quémeneur E, Ma E, Marsolier-Kergoat MC, Ropars V, Charbonnier JB, Miron S, Craescu CT, Callebaut I, Gilquin B, Zinn-Justin S. The checkpoint Saccharomyces cerevisiae Rad9 protein contains a tandem tudor domain that recognizes DNA. Nucleic Acids Res 2007; 35:5898-912. [PMID: 17726056 PMCID: PMC2034471 DOI: 10.1093/nar/gkm607] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
DNA damage checkpoints are signal transduction pathways that are activated after genotoxic insults to protect genomic integrity. At the site of DNA damage, ‘mediator’ proteins are in charge of recruiting ‘signal transducers’ to molecules ‘sensing’ the damage. Budding yeast Rad9, fission yeast Crb2 and metazoan 53BP1 are presented as mediators involved in the activation of checkpoint kinases. Here we show that, despite low sequence conservation, Rad9 exhibits a tandem tudor domain structurally close to those found in human/mouse 53BP1 and fission yeast Crb2. Moreover, this region is important for the resistance of Saccharomyces cerevisiae to different genotoxic stresses. It does not mediate direct binding to a histone H3 peptide dimethylated on K79, nor to a histone H4 peptide dimethylated on lysine 20, as was demonstrated for 53BP1. However, the tandem tudor region of Rad9 directly interacts with single-stranded DNA and double-stranded DNAs of various lengths and sequences through a positively charged region absent from 53BP1 and Crb2 but present in several yeast Rad9 homologs. Our results argue that the tandem tudor domains of Rad9, Crb2 and 53BP1 mediate chromatin binding next to double-strand breaks. However, their modes of chromatin recognition are different, suggesting that the corresponding interactions are differently regulated.
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Affiliation(s)
- Nathalie Lancelot
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Gaëlle Charier
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Joël Couprie
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Isabelle Duband-Goulet
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Béatrice Alpha-Bazin
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Eric Quémeneur
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Emilie Ma
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Marie-Claude Marsolier-Kergoat
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Virginie Ropars
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Jean-Baptiste Charbonnier
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Simona Miron
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Constantin T. Craescu
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Isabelle Callebaut
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Bernard Gilquin
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
| | - Sophie Zinn-Justin
- Institut de Biologie et Technologies de Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Institut Jacques Monod, CNRS et Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 05, Institut de Biologie Environnementale et de Biotechnologie, CEA VALRHO, 30207 Bagnols-sur-Ceze, CNRS, UMR5048, Centre de Biochimie Structurale, 34090 Montpellier; INSERM, U554, 34090 Montpellier; Université Montpellier 1 et 2, 34090 Montpellier, INSERM U759 & Institut Curie-Centre de Recherche, Centre Universitaire, Bâtiment 112, 91405 Orsay and IMPMC, UMR 7590 Universités Paris 6 et Paris 7, 140 rue de Lourmel, 75015 Paris, France
- *To whom correspondence should be addressed. +33 169083026+33 169084712
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Lüdtke A, Buettner J, Wu W, Muchir A, Schroeter A, Zinn-Justin S, Spuler S, Schmidt HHJ, Worman HJ. Peroxisome proliferator-activated receptor-gamma C190S mutation causes partial lipodystrophy. J Clin Endocrinol Metab 2007; 92:2248-55. [PMID: 17356052 DOI: 10.1210/jc.2005-2624] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT Mutations in PPARG are associated with insulin resistance and familial partial lipodystrophy, a disease characterized by altered distribution of sc fat and symptoms of the metabolic syndrome. The encoded protein, peroxisome proliferator-activated receptor (PPAR)-gamma, plays a pivotal role in regulating lipid and glucose metabolism, the differentiation of adipocytes, and other cellular regulatory processes. OBJECTIVES The objective of the study was to detect a novel PPARG mutation in a kindred with partial lipodystrophy and analyze the functional characteristics of the mutant protein. PATIENTS AND METHODS In three subjects with partial lipodystrophy, one unaffected family member, and 124 unaffected subjects, PPARG was screened for mutations by direct sequencing. Body composition, laboratory abnormalities, and hepatic steatosis were assessed in each affected subject. Transcriptional activity was determined, and EMSA was performed to investigate DNA binding capacity of the mutant protein. RESULTS We identified a PPARG mutation, C190S, causing partial lipodystrophy with metabolic alterations in three affected family members. The mutation was absent in the unaffected family member and unaffected controls. The mutation is located within zinc-finger 2 of the DNA binding domain. C190S PPARgamma has a significantly lower ability to activate a reporter gene than wild-type PPARgamma in absence and presence of rosiglitazone. A dominant-negative effect was not observed. Compared with wild-type PPARgamma, C190S PPARgamma shows a reduced capacity to bind DNA. CONCLUSION Mutation of a zinc-binding amino acid of PPARgamma leads to an altered protein-DNA binding pattern, resulting in a partial loss of function, which in turn is associated with partial lipodystrophy.
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Affiliation(s)
- Angelika Lüdtke
- Department of Medicine, College of Physicians and Surgeons, Columbia University, P&S Building 10-508, New York, NY 10032, USA
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le Maire A, Schiltz M, Stura EA, Pinon-Lataillade G, Couprie J, Moutiez M, Gondry M, Angulo JF, Zinn-Justin S. A tandem of SH3-like domains participates in RNA binding in KIN17, a human protein activated in response to genotoxics. J Mol Biol 2006; 364:764-76. [PMID: 17045609 DOI: 10.1016/j.jmb.2006.09.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2006] [Revised: 08/24/2006] [Accepted: 09/11/2006] [Indexed: 10/24/2022]
Abstract
The human KIN17 protein is an essential nuclear protein conserved from yeast to human and expressed ubiquitously in mammals. Suppression of Rts2, the yeast equivalent of gene KIN17, renders the cells unviable, and silencing the human KIN17 gene slows cell growth dramatically. Moreover, the human gene KIN17 is up-regulated following exposure to ionizing radiations and UV light, depending on the integrity of the human global genome repair machinery. Its ectopic over-expression blocks S-phase progression by inhibiting DNA synthesis. The C-terminal region of human KIN17 is crucial for this anti-proliferation effect. Its high-resolution structure, presented here, reveals a tandem of SH3-like subdomains. This domain binds to ribonucleotide homopolymers with the same preferences as the whole protein. Analysis of its structure complexed with tungstate shows structural variability within the domain. The interaction with tungstate is mediated by several lysine residues located within a positively charged groove at the interface between the two subdomains. This groove could be the site of interaction with RNA, since mutagenesis of two of these highly conserved lysine residue weakens RNA binding.
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Verstraeten VLRM, Broers JLV, van Steensel MAM, Zinn-Justin S, Ramaekers FCS, Steijlen PM, Kamps M, Kuijpers HJH, Merckx D, Smeets HJM, Hennekam RCM, Marcelis CLM, van den Wijngaard A. Compound heterozygosity for mutations in LMNA causes a progeria syndrome without prelamin A accumulation. Hum Mol Genet 2006; 15:2509-22. [PMID: 16825282 DOI: 10.1093/hmg/ddl172] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
LMNA-associated progeroid syndromes have been reported with both recessive and dominant inheritance. We report a 2-year-old boy with an apparently typical Hutchinson-Gilford progeria syndrome (HGPS) due to compound heterozygous missense mutations (p.T528M and p.M540T) in LMNA. Both mutations affect a conserved region within the C-terminal globular domain of A-type lamins, defining a progeria hot spot. The nuclei of the patient showed no prelamin A accumulation. In general, the nuclear phenotype did not correspond to that previously described for HGPS. Instead, honeycomb figures predominated and nuclear blebs with reduced/absent expression of B-type lamins could be detected. The healthy heterozygous parents showed similar nuclear changes, although in a smaller percentage of nuclei. Treatment with a farnesylation inhibitor resulted in accumulation of prelamin A at the nuclear periphery, in annular nuclear membrane plaques and in intra/trans-nuclear membrane invaginations. In conclusion, these findings suggest a critical role for the C-terminal globular lamin A/C region in nuclear structure and support a major contribution of abnormal assembly to the progeroid phenotype. In contrast to earlier suggestions, we show that prelamin A accumulation is not the major determinant of the progeroid phenotype.
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Affiliation(s)
- Valerie L R M Verstraeten
- Department of Dermatology, University Hospital Maastricht, P. Debyelaan 25, 6202 AZ Maastricht, The Netherlands.
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Trésaugues L, Dehé PM, Guérois R, Rodriguez-Gil A, Varlet I, Salah P, Pamblanco M, Luciano P, Quevillon-Cheruel S, Sollier J, Leulliot N, Couprie J, Tordera V, Zinn-Justin S, Chàvez S, van Tilbeurgh H, Géli V. Structural Characterization of Set1 RNA Recognition Motifs and their Role in Histone H3 Lysine 4 Methylation. J Mol Biol 2006; 359:1170-81. [PMID: 16787775 DOI: 10.1016/j.jmb.2006.04.050] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2006] [Revised: 04/19/2006] [Accepted: 04/24/2006] [Indexed: 10/24/2022]
Abstract
The yeast Set1 histone H3 lysine 4 (H3K4) methyltransferase contains, in addition to its catalytic SET domain, a conserved RNA recognition motif (RRM1). We present here the crystal structure and the secondary structure assignment in solution of the Set1 RRM1. Although RRM1 has the expected betaalphabetabetaalphabeta RRM-fold, it lacks the typical RNA-binding features of these modules. RRM1 is not able to bind RNA by itself in vitro, but a construct combining RRM1 with a newly identified downstream RRM2 specifically binds RNA. In vivo, H3K4 methylation is not affected by a point mutation in RRM2 that preserves Set1 stability but affects RNA binding in vitro. In contrast mutating RRM1 destabilizes Set1 and leads to an increase of dimethylation of H3K4 at the 5'-coding region of active genes at the expense of trimethylation, whereas both, dimethylation decreases at the 3'-coding region. Taken together, our results suggest that Set1 RRMs bind RNA, but Set1 RNA-binding activity is not linked to H3K4 methylation.
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Affiliation(s)
- Lionel Trésaugues
- Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, UMR8619 CNRS, Université de Paris-Sud, Orsay, France
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