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Skoko JJ, Cao J, Gaboriau D, Attar M, Asan A, Hong L, Paulsen CE, Ma H, Liu Y, Wu H, Harkness T, Furdui CM, Manevich Y, Morrison CG, Brown ET, Normolle D, Spies M, Spies MA, Carroll K, Neumann CA. Redox regulation of RAD51 Cys319 and homologous recombination by peroxiredoxin 1. Redox Biol 2022; 56:102443. [PMID: 36058112 PMCID: PMC9450138 DOI: 10.1016/j.redox.2022.102443] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 08/01/2022] [Accepted: 08/11/2022] [Indexed: 11/28/2022] Open
Abstract
RAD51 is a critical recombinase that functions in concert with auxiliary mediator proteins to direct the homologous recombination (HR) DNA repair pathway. We show that Cys319 RAD51 possesses nucleophilic characteristics and is important for irradiation-induced RAD51 foci formation and resistance to inhibitors of poly (ADP-ribose) polymerase (PARP). We have previously identified that cysteine (Cys) oxidation of proteins can be important for activity and modulated via binding to peroxiredoxin 1 (PRDX1). PRDX1 reduces peroxides and coordinates the signaling actions of protein binding partners. Loss of PRDX1 inhibits irradiation-induced RAD51 foci formation and represses HR DNA repair. PRDX1-deficient human breast cancer cells and mouse embryonic fibroblasts display disrupted RAD51 foci formation and decreased HR, resulting in increased DNA damage and sensitization of cells to irradiation. Following irradiation cells deficient in PRDX1 had increased incorporation of the sulfenylation probe DAz-2 in RAD51 Cys319, a functionally-significant, thiol that PRDX1 is critical for maintaining in a reduced state. Molecular dynamics (MD) simulations of dT-DNA bound to a non-oxidized RAD51 protein showed tight binding throughout the simulation, while dT-DNA dissociated from an oxidized Cys319 RAD51 filament. These novel data establish RAD51 Cys319 as a functionally-significant site for the redox regulation of HR and cellular responses to IR. A functionally-significant Cys319 was identified in RAD51 that possesses nucleophilic characteristics. RAD51 Cys319 plays a central role in RAD51-mediated repair of DNA double strand breaks (DSB). Loss of peroxiredoxin 1 (PRDX1) impairs DNA DSB repair by homologous recombination and results in DNA damage. PRDX1 is critical for maintaining RAD51 Cys319 in a reduced state. Molecular dynamic (MD) simulations suggest ssDNA to dissociate from sulfenylated and not reduced RAD51 Cys319.
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Affiliation(s)
- John J Skoko
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15261, USA; Women's Cancer Research Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA, 15213, USA; Magee-Women's Research Institute, Magee-Women's Research Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA
| | - Juxiang Cao
- Department of Cell and Molecular Pharmacology, The Medical University of South Carolina, Charleston, SC, 29425, USA
| | - David Gaboriau
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland; Facility for Imaging By Light Microscopy, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Myriam Attar
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15261, USA; Women's Cancer Research Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA, 15213, USA; Magee-Women's Research Institute, Magee-Women's Research Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA
| | - Alparslan Asan
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15261, USA; Women's Cancer Research Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA, 15213, USA; Magee-Women's Research Institute, Magee-Women's Research Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA
| | - Lisa Hong
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15261, USA; Women's Cancer Research Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA, 15213, USA; Magee-Women's Research Institute, Magee-Women's Research Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA
| | - Candice E Paulsen
- Department of Chemistry, Scripps Research Institute Florida, Jupiter, FL, 33458, USA
| | - Hongqiang Ma
- Biomedical Optical Imaging Laboratory, Departments of Medicine and Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Yang Liu
- Biomedical Optical Imaging Laboratory, Departments of Medicine and Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Hanzhi Wu
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA; Center for Redox Biology and Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Trey Harkness
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15261, USA
| | - Cristina M Furdui
- Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA; Center for Redox Biology and Medicine, Wake Forest School of Medicine, Winston-Salem, NC, 27157, USA
| | - Yefim Manevich
- Department of Cell and Molecular Pharmacology, The Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Ciaran G Morrison
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Erika T Brown
- Dartmouth Geisel School of Medicine, Hanover, NH, 03755, USA
| | - Daniel Normolle
- Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Maria Spies
- Department of Biochemistry and Molecular Biology, University of Iowa, IA, 52242, USA
| | - Michael Ashley Spies
- Department of Biochemistry and Molecular Biology, Department of Pharmaceutical Sciences and Experimental Therapeutics, University of Iowa, IA, 52242, USA
| | - Kate Carroll
- Department of Chemistry, Scripps Research Institute Florida, Jupiter, FL, 33458, USA
| | - Carola A Neumann
- Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, 15261, USA; Women's Cancer Research Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA, 15213, USA; Magee-Women's Research Institute, Magee-Women's Research Hospital of University of Pittsburgh Medical Center, Pittsburgh, PA, 15213, USA.
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Ogungbenro YA, Tena TC, Gaboriau D, Lalor P, Dockery P, Philipp M, Morrison CG. Centrobin controls primary ciliogenesis in vertebrates. J Cell Biol 2018; 217:1205-1215. [PMID: 29440264 PMCID: PMC5881496 DOI: 10.1083/jcb.201706095] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 06/15/2017] [Revised: 07/19/2017] [Accepted: 01/17/2018] [Indexed: 12/18/2022] Open
Abstract
The BRCA2 interactor, centrobin, is a centrosomal protein that has been implicated in centriole duplication and microtubule stability. We used genome editing to ablate CNTROB in hTERT-RPE1 cells and observed an increased frequency of monocentriolar and acentriolar cells. Using a novel monoclonal antibody, we found that centrobin primarily localizes to daughter centrioles but also associates with mother centrioles upon serum starvation. Strikingly, centrobin loss abrogated primary ciliation upon serum starvation. Ultrastructural analysis of centrobin nulls revealed defective axonemal extension after mother centriole docking. Ciliogenesis required a C-terminal portion of centrobin that interacts with CP110 and tubulin. We also depleted centrobin in zebrafish embryos to explore its roles in an entire organism. Centrobin-depleted embryos showed microcephaly, with curved and shorter bodies, along with marked defects in laterality control, morphological features that indicate ciliary dysfunction. Our data identify new roles for centrobin as a positive regulator of vertebrate ciliogenesis.
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Affiliation(s)
- Yetunde Adesanya Ogungbenro
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Teresa Casar Tena
- Institute of Biochemistry and Molecular Biology, Ulm University, Ulm, Germany
| | - David Gaboriau
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.,Facility for Imaging by Light Microscopy, Imperial College London, London, England, UK
| | - Pierce Lalor
- Anatomy, School of Medicine, National University of Ireland Galway, Galway, Ireland
| | - Peter Dockery
- Anatomy, School of Medicine, National University of Ireland Galway, Galway, Ireland
| | - Melanie Philipp
- Institute of Biochemistry and Molecular Biology, Ulm University, Ulm, Germany
| | - Ciaran G Morrison
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
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Sekine E, Schmidt N, Gaboriau D, O’Hare P. Spatiotemporal dynamics of HSV genome nuclear entry and compaction state transitions using bioorthogonal chemistry and super-resolution microscopy. PLoS Pathog 2017; 13:e1006721. [PMID: 29121649 PMCID: PMC5697887 DOI: 10.1371/journal.ppat.1006721] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [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: 08/30/2017] [Revised: 11/21/2017] [Accepted: 10/30/2017] [Indexed: 12/29/2022] Open
Abstract
We investigated the spatiotemporal dynamics of HSV genome transport during the initiation of infection using viruses containing bioorthogonal traceable precursors incorporated into their genomes (HSVEdC). In vitro assays revealed a structural alteration in the capsid induced upon HSVEdC binding to solid supports that allowed coupling to external capture agents and demonstrated that the vast majority of individual virions contained bioorthogonally-tagged genomes. Using HSVEdC in vivo we reveal novel aspects of the kinetics, localisation, mechanistic entry requirements and morphological transitions of infecting genomes. Uncoating and nuclear import was observed within 30 min, with genomes in a defined compaction state (ca. 3-fold volume increase from capsids). Free cytosolic uncoated genomes were infrequent (7-10% of the total uncoated genomes), likely a consequence of subpopulations of cells receiving high particle numbers. Uncoated nuclear genomes underwent temporal transitions in condensation state and while ICP4 efficiently associated with condensed foci of initial infecting genomes, this relationship switched away from residual longer lived condensed foci to increasingly decondensed genomes as infection progressed. Inhibition of transcription had no effect on nuclear entry but in the absence of transcription, genomes persisted as tightly condensed foci. Ongoing transcription, in the absence of protein synthesis, revealed a distinct spatial clustering of genomes, which we have termed genome congregation, not seen with non-transcribing genomes. Genomes expanded to more decondensed forms in the absence of DNA replication indicating additional transitional steps. During full progression of infection, genomes decondensed further, with a diffuse low intensity signal dissipated within replication compartments, but frequently with tight foci remaining peripherally, representing unreplicated genomes or condensed parental strands of replicated DNA. Uncoating and nuclear entry was independent of proteasome function and resistant to inhibitors of nuclear export. Together with additional data our results reveal new insight into the spatiotemporal dynamics of HSV genome uncoating, transport and organisation.
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Affiliation(s)
- Eiki Sekine
- Section of Virology, Department of Medicine, Imperial College, St Mary’s Medical School, London, United Kingdom
| | - Nora Schmidt
- Section of Virology, Department of Medicine, Imperial College, St Mary’s Medical School, London, United Kingdom
| | - David Gaboriau
- Department of Medicine, Facility for Imaging by Light Microscopy, National Heart and Lung Institute, Imperial College, London, United Kingdom
| | - Peter O’Hare
- Section of Virology, Department of Medicine, Imperial College, St Mary’s Medical School, London, United Kingdom
- * E-mail:
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Rainey MD, Quachthithu H, Gaboriau D, Santocanale C. DNA Replication Dynamics and Cellular Responses to ATP Competitive CDC7 Kinase Inhibitors. ACS Chem Biol 2017; 12:1893-1902. [PMID: 28560864 DOI: 10.1021/acschembio.7b00117] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The CDC7 kinase, by phosphorylating the MCM DNA helicase, is a key switch for DNA replication initiation. ATP competitive CDC7 inhibitors are being developed as potential anticancer agents; however how human cells respond to the selective pharmacological inhibition of this kinase is controversial and not understood. Here we have characterized the mode of action of the two widely used CDC7 inhibitors, PHA-767491 and XL-413, which have become important tool compounds to explore the kinase's cellular functions. We have used a chemical genetics approach to further characterize pharmacological CDC7 inhibition and CRISPR/CAS9 technology to assess the requirement for kinase activity for cell proliferation. We show that, in human breast cells, CDC7 is essential and that CDC7 kinase activity is formally required for proliferation. However, full and sustained inhibition of the kinase, which is required to block the cell-cycle progression with ATP competitor compounds, is problematic to achieve. We establish that MCM2 phosphorylation is highly sensitive to CDC7 inhibition and, as a biomarker, it lacks in dynamic range since it is easily lost at concentrations of inhibitors that only mildly affect DNA synthesis. Furthermore, we find that the cellular effects of selective CDC7 inhibitors can be altered by the concomitant inhibition of cell-cycle and transcriptional CDKs. This work shows that DNA replication and cell proliferation can occur with reduced CDC7 activity for at least 5 days and that the bulk of DNA synthesis is not tightly coupled to MCM2 phosphorylation and provides guidance for the development of next generation CDC7 inhibitors.
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Affiliation(s)
- Michael D. Rainey
- Centre for Chromosome Biology,
School of Natural Sciences, National University of Ireland Galway H91 TK33, Ireland
| | - Huong Quachthithu
- Centre for Chromosome Biology,
School of Natural Sciences, National University of Ireland Galway H91 TK33, Ireland
| | - David Gaboriau
- Centre for Chromosome Biology,
School of Natural Sciences, National University of Ireland Galway H91 TK33, Ireland
| | - Corrado Santocanale
- Centre for Chromosome Biology,
School of Natural Sciences, National University of Ireland Galway H91 TK33, Ireland
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5
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Flanagan AM, Stavenschi E, Basavaraju S, Gaboriau D, Hoey DA, Morrison CG. Centriole splitting caused by loss of the centrosomal linker protein C-NAP1 reduces centriolar satellite density and impedes centrosome amplification. Mol Biol Cell 2017; 28:736-745. [PMID: 28100636 PMCID: PMC5349781 DOI: 10.1091/mbc.e16-05-0325] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [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: 05/27/2016] [Revised: 01/10/2017] [Accepted: 01/11/2017] [Indexed: 12/24/2022] Open
Abstract
Duplication of the centrosomes is a tightly regulated process. Abnormal centrosome numbers can impair cell division and cause changes in how cells migrate. Duplicated centrosomes are held together by a proteinaceous linker made up of rootletin filaments anchored to the centrioles by C-NAP1. This linker is removed in a NEK2A kinase-dependent manner as mitosis begins. To explore C-NAP1 activities in regulating centrosome activities, we used genome editing to ablate it. C-NAP1-null cells were viable and had an increased frequency of premature centriole separation, accompanied by reduced density of the centriolar satellites, with reexpression of C-NAP1 rescuing both phenotypes. We found that the primary cilium, a signaling structure that arises from the mother centriole docked to the cell membrane, was intact in the absence of C-NAP1, although components of the ciliary rootlet were aberrantly localized away from the base of the cilium. C-NAP1-deficient cells were capable of signaling through the cilium, as determined by gene expression analysis after fluid flow-induced shear stress and the relocalization of components of the Hedgehog pathway. Centrosome amplification induced by DNA damage or by PLK4 or CDK2 overexpression was markedly reduced in the absence of C-NAP1. We conclude that centriole splitting reduces the local density of key centriolar precursors to impede overduplication.
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Affiliation(s)
- Anne-Marie Flanagan
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Elena Stavenschi
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, and
- Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
| | - Shivakumar Basavaraju
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - David Gaboriau
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - David A Hoey
- Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute, and
- Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
- Advanced Materials and Bioengineering Research Centre, Trinity College Dublin, and Royal College of Surgeons in Ireland, Dublin 2, Ireland
| | - Ciaran G Morrison
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
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Balistreri N, Gaboriau D, Jolivalt C, Launay F. Covalent immobilization of glucose oxidase on mesocellular silica foams: Characterization and stability towards temperature and organic solvents. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.02.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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McGarry E, Gaboriau D, Rainey MD, Restuccia U, Bachi A, Santocanale C. The Deubiquitinase USP9X Maintains DNA Replication Fork Stability and DNA Damage Checkpoint Responses by Regulating CLASPIN during S-Phase. Cancer Res 2016; 76:2384-93. [PMID: 26921344 DOI: 10.1158/0008-5472.can-15-2890] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 02/15/2016] [Indexed: 11/16/2022]
Abstract
Coordination of the multiple processes underlying DNA replication is key for maintaining genome stability and preventing tumorigenesis. CLASPIN, a critical player in replication fork stabilization and checkpoint responses, must be tightly regulated during the cell cycle to prevent the accumulation of DNA damage. In this study, we used a quantitative proteomics approach and identified USP9X as a novel CLASPIN-interacting protein. USP9X is a deubiquitinase involved in multiple signaling and survival pathways whose tumor suppressor or oncogenic activity is highly context dependent. We found that USP9X regulated the expression and stability of CLASPIN in an S-phase-specific manner. USP9X depletion profoundly impairs the progression of DNA replication forks, causing unscheduled termination events with a frequency similar to CLASPIN depletion, resulting in excessive endogenous DNA damage. Importantly, restoration of CLASPIN expression in USP9X-depleted cells partially suppressed the accumulation of DNA damage. Furthermore, USP9X depletion compromised CHK1 activation in response to hydroxyurea and UV, thus promoting hypersensitivity to drug-induced replication stress. Taken together, our results reveal a novel role for USP9X in the maintenance of genomic stability during DNA replication and provide potential mechanistic insights into its tumor suppressor role in certain malignancies. Cancer Res; 76(8); 2384-93. ©2016 AACR.
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Affiliation(s)
- Edel McGarry
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - David Gaboriau
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Michael D Rainey
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | | | - Angela Bachi
- IFOM-FIRC Institute of Molecular Oncology, Milan, Italy
| | - Corrado Santocanale
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.
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Daly OM, Gaboriau D, Karakaya K, King S, Dantas TJ, Lalor P, Dockery P, Krämer A, Morrison CG. Gene-targeted CEP164-deficient cells show a ciliation defect with intact DNA repair capacity. J Cell Sci 2016; 129:1769-74. [DOI: 10.1242/jcs.186221] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 03/08/2016] [Indexed: 12/31/2022] Open
Abstract
Primary cilia are microtubule structures that extend from the distal end of the mature, mother centriole. CEP164 is a component of the distal appendages carried by the mother centriole that is required for primary cilium formation. Recent data have implicated CEP164 as a ciliopathy gene and suggest that CEP164 plays some roles in the DNA damage response (DDR). We used reverse genetics to test the role of CEP164 in the DDR. We found that conditional depletion of CEP164 in chicken DT40 cells using an auxin-inducible degron led to no increase in sensitivity to DNA damage induced by ionising or ultraviolet irradiation. Disruption of CEP164 in human retinal pigmented epithelial cells blocked primary cilium formation but did not affect cellular proliferation or cellular responses to ionising or ultraviolet irradiation. Furthermore, we observed no localisation of CEP164 to the nucleus using immunofluorescence microscopy and analysis of multiple tagged forms of CEP164. Our data suggest that CEP164 is not required in the DDR.
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Affiliation(s)
- Owen M. Daly
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - David Gaboriau
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Kadin Karakaya
- Clinical Cooperation Unit Molecular Hematology/Oncology, German Cancer Research Center (DKFZ) and Department of Internal Medicine V, University of Heidelberg, Im Neuenheimer Feld 280, 69120, Heidelberg, Germany
| | - Sinéad King
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Tiago J. Dantas
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Pierce Lalor
- Anatomy, School of Medicine, National University of Ireland Galway, Galway, Ireland
| | - Peter Dockery
- Anatomy, School of Medicine, National University of Ireland Galway, Galway, Ireland
| | - Alwin Krämer
- Clinical Cooperation Unit Molecular Hematology/Oncology, German Cancer Research Center (DKFZ) and Department of Internal Medicine V, University of Heidelberg, Im Neuenheimer Feld 280, 69120, Heidelberg, Germany
| | - Ciaran G. Morrison
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
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Gaboriau D, Aradilla D, Brachet M, Le Bideau J, Brousse T, Bidan G, Gentile P, Sadki S. Silicon nanowires and nanotrees: elaboration and optimization of new 3D architectures for high performance on-chip supercapacitors. RSC Adv 2016. [DOI: 10.1039/c6ra14806a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Micro-supercapacitors are increasingly foreseen as future energy storage or power buffer solutions for small scale integration on-chip. This study develops optimized silicon nanotrees as an innovative electrode material.
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Affiliation(s)
- D. Gaboriau
- Univ. Grenoble Alpes
- INAC-SPRAM
- F-38000 Grenoble
- France
- CNRS
| | - D. Aradilla
- Univ. Grenoble Alpes
- INAC-SPRAM
- F-38000 Grenoble
- France
- CNRS
| | - M. Brachet
- Institut des Matériaux Jean Rouxel
- Université de Nantes – CNRS
- 44322 Nantes Cedex 3
- France
| | - J. Le Bideau
- Institut des Matériaux Jean Rouxel
- Université de Nantes – CNRS
- 44322 Nantes Cedex 3
- France
| | - T. Brousse
- Institut des Matériaux Jean Rouxel
- Université de Nantes – CNRS
- 44322 Nantes Cedex 3
- France
| | - G. Bidan
- Univ. Grenoble Alpes
- INAC-SPRAM
- F-38000 Grenoble
- France
- CNRS
| | - P. Gentile
- Univ. Grenoble Alpes
- INAC-SP2M
- F-38000 Grenoble
- France
- CEA
| | - S. Sadki
- Univ. Grenoble Alpes
- INAC-SPRAM
- F-38000 Grenoble
- France
- CNRS
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O'Connor A, Maffini S, Rainey MD, Kaczmarczyk A, Gaboriau D, Musacchio A, Santocanale C. Requirement for PLK1 kinase activity in the maintenance of a robust spindle assembly checkpoint. Biol Open 2015; 5:11-9. [PMID: 26685311 PMCID: PMC4728306 DOI: 10.1242/bio.014969] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
During mitotic arrest induced by microtubule targeting drugs, the weakening of the spindle assembly checkpoint (SAC) allows cells to progress through the cell cycle without chromosome segregation occurring. PLK1 kinase plays a major role in mitosis and emerging evidence indicates that PLK1 is also involved in establishing the checkpoint and maintaining SAC signalling. However, mechanistically, the role of PLK1 in the SAC is not fully understood, with several recent reports indicating that it can cooperate with either one of the major checkpoint kinases, Aurora B or MPS1. In this study, we assess the role of PLK1 in SAC maintenance. We find that in nocodazole-arrested U2OS cells, PLK1 activity is continuously required for maintaining Aurora B protein localisation and activity at kinetochores. Consistent with published data we find that upon PLK1 inhibition, phosphoThr3-H3, a marker of Haspin activity, is reduced. Intriguingly, Aurora B inhibition causes PLK1 to relocalise from kinetochores into fewer and much larger foci, possibly due to incomplete recruitment of outer kinetochore proteins. Importantly, PLK1 inhibition, together with partial inhibition of Aurora B, allows efficient SAC override to occur. This phenotype is more pronounced than the phenotype observed by combining the same PLK1 inhibitors with partial MPS1 inhibition. We also find that PLK1 inhibition does not obviously cooperate with Haspin inhibition to promote SAC override. These results indicate that PLK1 is directly involved in maintaining efficient SAC signalling, possibly by cooperating in a positive feedback loop with Aurora B, and that partially redundant mechanisms exist which reinforce the SAC.
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Affiliation(s)
- Aisling O'Connor
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Stefano Maffini
- Max-Planck Institute of Molecular Physiology, Department of Mechanistic Cell Biology, Dortmund 44227, Germany
| | - Michael D Rainey
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Agnieszka Kaczmarczyk
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - David Gaboriau
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Andrea Musacchio
- Max-Planck Institute of Molecular Physiology, Department of Mechanistic Cell Biology, Dortmund 44227, Germany Centre for Medical Biotechnology, Faculty of Biology, University Duisburg-Essen, Universitätsstrasse, Essen 45141, Germany
| | - Corrado Santocanale
- Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
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Gaboriau D, Howes EA, Clark J, Jones R. Binding of sperm proacrosin/β-acrosin to zona pellucida glycoproteins is sulfate and stereodependent. Synthesis of a novel fertilization inhibitor. Dev Biol 2007; 306:646-57. [PMID: 17482590 DOI: 10.1016/j.ydbio.2007.04.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [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: 01/22/2007] [Revised: 03/23/2007] [Accepted: 04/02/2007] [Indexed: 11/29/2022]
Abstract
Specific binding of spermatozoa to the zona pellucida that surrounds mammalian eggs is a key step in the fertilization process. However, the sperm proteins that recognise zona pellucida receptors remain contentious despite longstanding research efforts to identify them. Here we present evidence that proacrosin, a tissue-specific protein found within the acrosomal vesicle of all mammalian spermatozoa, is a multifunctional protein that mediates binding of acrosome-reacted spermatozoa to zona glycoproteins via a stereospecific polysulfate recognition mechanism. Using sulfated versus non-sulfated forms of chemically defined compounds in binding assays employing native proteins in their normal cellular location or conjugated to FluoSpheres, we have attempted to identify the sulfation "code" required for recognition. Results show that protein conformation is important for specificity and that at least 2 sulfate groups are required to cross-link spatially separated docking sites on proacrosin. The consistently most effective inhibitory compounds were suramin and quercetin-3beta-d-glucoside sulfate. The results support our hypothesis that proacrosin is one of several proteins in the acrosomal matrix that retain acrosome reacted spermatozoa on the zona surface prior to penetration. They also establish, as a proof-of-principle, the feasibility of synthesising sulfated compounds of high specificity as antifertility agents for human or animal use.
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Affiliation(s)
- David Gaboriau
- Laboratory of Molecular Signalling, The Babraham Institute, Cambridge, UK
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Abstract
The determination of membrane fluidity in whole cells of Oenococcus oeni was achieved by membrane probe 1,6-diphenyl-1,3,5-hexatriene fluorescence anisotropy measurements. The results demonstrated instantaneous fluidity variations with cells directly stressed during the measure. Heat (42 degrees C) or acid (pH 3.2) shocks decreased the anisotropy values (fluidising effects), whereas an ethanol shock (10% ethanol, v/v) increased the membrane rigidity. The velocities of fluidity variation with non-adapted or adapted cells (incubation in inhibitory growth conditions) were compared. The adaptation of the cells to acid conditions had no effect on the membrane fluidity variation after an acid shock. In contrast, the rates of membrane fluidity variation of adapted cells were 5- and 3-fold lower after a heat shock and an ethanol shock, respectively. These results suggest the positive effect of an adaptation on the membrane response and can help to explain the mechanisms of stress tolerance in Oenococcus oeni.
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Affiliation(s)
- R Tourdot-Maréchal
- Laboratoire de Microbiologie UA Inra, Ensbana, Université de Bourgogne Dijon, France.
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