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Prokaryotic expression of goldfish Tgf2 transposase with optimal codons and its enzyme activity. AQUACULTURE AND FISHERIES 2019. [DOI: 10.1016/j.aaf.2018.12.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Claeys Bouuaert C, Chalmers R. A single active site in the mariner transposase cleaves DNA strands of opposite polarity. Nucleic Acids Res 2017; 45:11467-11478. [PMID: 29036477 PMCID: PMC5714172 DOI: 10.1093/nar/gkx826] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Accepted: 09/08/2017] [Indexed: 01/01/2023] Open
Abstract
The RNase H structural fold defines a large family of nucleic acid metabolizing enzymes that catalyze phosphoryl transfer reactions using two divalent metal ions in the active site. Almost all of these reactions involve only one strand of the nucleic acid substrates. In contrast, cut-and-paste transposases cleave two DNA strands of opposite polarity, which is usually achieved via an elegant hairpin mechanism. In the mariner transposons, the hairpin intermediate is absent and key aspects of the mechanism by which the transposon ends are cleaved remained unknown. Here, we characterize complexes involved prior to catalysis, which define an asymmetric pathway for transpososome assembly. Using mixtures of wild-type and catalytically inactive transposases, we show that all the catalytic steps of transposition occur within the context of a dimeric transpososome. Crucially, we find that each active site of a transposase dimer is responsible for two hydrolysis and one transesterification reaction at the same transposon end. These results provide the first strong evidence that a DDE/D active site can hydrolyze DNA strands of opposite polarity, a mechanism that has rarely been observed with any type of nuclease.
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Affiliation(s)
- Corentin Claeys Bouuaert
- School of Biomedical Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
| | - Ronald Chalmers
- School of Biomedical Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
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Jiang XY, Hou F, Shen XD, Du XD, Xu HL, Zou SM. The N-terminal zinc finger domain of Tgf2 transposase contributes to DNA binding and to transposition activity. Sci Rep 2016; 6:27101. [PMID: 27251101 PMCID: PMC4890040 DOI: 10.1038/srep27101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/13/2016] [Indexed: 01/14/2023] Open
Abstract
Active Hobo/Activator/Tam3 (hAT) transposable elements are rarely found in vertebrates. Previously, goldfish Tgf2 was found to be an autonomously active vertebrate transposon that is efficient at gene-transfer in teleost fish. However, little is known about Tgf2 functional domains required for transposition. To explore this, we first predicted in silico a zinc finger domain in the N-terminus of full length Tgf2 transposase (L-Tgf2TPase). Two truncated recombinant Tgf2 transposases with deletions in the N-terminal zinc finger domain, S1- and S2-Tgf2TPase, were expressed in bacteria from goldfish cDNAs. Both truncated Tgf2TPases lost their DNA-binding ability in vitro, specifically at the ends of Tgf2 transposon than native L-Tgf2TPase. Consequently, S1- and S2-Tgf2TPases mediated gene transfer in the zebrafish genome in vivo at a significantly (p < 0.01) lower efficiency (21%–25%), in comparison with L-Tgf2TPase (56% efficiency). Compared to L-Tgf2TPase, truncated Tgf2TPases catalyzed imprecise excisions with partial deletion of TE ends and/or plasmid backbone insertion/deletion. The gene integration into the zebrafish genome mediated by truncated Tgf2TPases was imperfect, creating incomplete 8-bp target site duplications at the insertion sites. These results indicate that the zinc finger domain in Tgf2 transposase is involved in binding to Tgf2 terminal sequences, and loss of those domains has effects on TE transposition.
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Affiliation(s)
- Xia-Yun Jiang
- College of Food Science and Technology, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China.,Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Fei Hou
- College of Food Science and Technology, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Xiao-Dan Shen
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Xue-Di Du
- College of animal science and technology, Yangzhou University, Wenhui Road 48, Yangzhou 225009, China
| | - Hai-Li Xu
- College of Food Science and Technology, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
| | - Shu-Ming Zou
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Huchenghuan Road 999, Shanghai 201306, China
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Esnault C, Jaillet J, Delorme N, Bouchet N, Renault S, Douziech-Eyrolles L, Pilard JF, Augé-Gouillou C. Kinetic analysis of the interaction of Mos1 transposase with its inverted terminal repeats reveals new insight into the protein-DNA complex assembly. Chembiochem 2015; 16:140-8. [PMID: 25487538 DOI: 10.1002/cbic.201402466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Indexed: 11/08/2022]
Abstract
Transposases are specific DNA-binding proteins that promote the mobility of discrete DNA segments. We used a combination of physicochemical approaches to describe the association of MOS1 (an eukaryotic transposase) with its specific target DNA, an event corresponding to the first steps of the transposition cycle. Because the kinetic constants of the reaction are still unknown, we aimed to determine them by using quartz crystal microbalance on two sources of recombinant MOS1: one produced in insect cells and the other produced in bacteria. The prokaryotic-expressed MOS1 showed no cooperativity and displayed a Kd of about 300 nM. In contrast, the eukaryotic-expressed MOS1 generated a cooperative system, with a lower Kd (∼ 2 nm). The origins of these differences were investigated by IR spectroscopy and AFM imaging. Both support the conclusion that prokaryotic- and eukaryotic-expressed MOS1 are not similarly folded, thereby resulting in differences in the early steps of transposition.
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Affiliation(s)
- Charles Esnault
- Groupe Instabilité Génétique et Transposases, EA 6306, Fédération GICC, UFR Sciences Pharmaceutiques, Université François Rabelais, 31 Avenue Monge, 37200 Tours (France)
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Claeys Bouuaert C, Walker N, Liu D, Chalmers R. Crosstalk between transposase subunits during cleavage of the mariner transposon. Nucleic Acids Res 2014; 42:5799-808. [PMID: 24623810 PMCID: PMC4027188 DOI: 10.1093/nar/gku172] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 02/10/2014] [Accepted: 02/11/2014] [Indexed: 12/18/2022] Open
Abstract
Mariner transposition is a complex reaction that involves three recombination sites and six strand breaking and joining reactions. This requires precise spatial and temporal coordination between the different components to ensure a productive outcome and minimize genomic instability. We have investigated how the cleavage events are orchestrated within the mariner transpososome. We find that cleavage of the non-transferred strand is completed at both transposon ends before the transferred strand is cleaved at either end. By introducing transposon-end mutations that interfere with cleavage, but leave transpososome assembly unaffected, we demonstrate that a structural transition preceding transferred strand cleavage is coordinated between the two halves of the transpososome. Since mariner lacks the DNA hairpin intermediate, this transition probably reflects a reorganization of the transpososome to allow the access of different monomers onto the second pair of strands, or the relocation of the DNA within the same active site between two successive hydrolysis events. Communication between transposase subunits also provides a failsafe mechanism that restricts the generation of potentially deleterious double-strand breaks at isolated sites. Finally, we identify transposase mutants that reveal that the conserved WVPHEL motif provides a structural determinant of the coordination mechanism.
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Affiliation(s)
- Corentin Claeys Bouuaert
- School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
| | - Neil Walker
- School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
| | - Danxu Liu
- School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
| | - Ronald Chalmers
- School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
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Bouchet N, Jaillet J, Gabant G, Brillet B, Briseño-Roa L, Cadene M, Augé-Gouillou C. cAMP protein kinase phosphorylates the Mos1 transposase and regulates its activity: evidences from mass spectrometry and biochemical analyses. Nucleic Acids Res 2014; 42:1117-28. [PMID: 24081583 PMCID: PMC3902898 DOI: 10.1093/nar/gkt874] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 09/05/2013] [Accepted: 09/06/2013] [Indexed: 12/19/2022] Open
Abstract
Genomic plasticity mediated by transposable elements can have a dramatic impact on genome integrity. To minimize its genotoxic effects, it is tightly regulated either by intrinsic mechanisms (linked to the element itself) or by host-mediated mechanisms. Using mass spectrometry, we show here for the first time that MOS1, the transposase driving the mobility of the mariner Mos1 element, is phosphorylated. We also show that the transposition activity of MOS1 is downregulated by protein kinase AMP cyclic-dependent phosphorylation at S170, which renders the transposase unable to promote Mos1 transposition. One step in the transposition cycle, the assembly of the paired-end complex, is specifically inhibited. At the cellular level, we provide evidence that phosphorylation at S170 prevents the active transport of the transposase into the nucleus. Our data suggest that protein kinase AMP cyclic-dependent phosphorylation may play a double role in the early stages of genome invasion by mariner elements.
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Affiliation(s)
- Nicolas Bouchet
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
| | - Jérôme Jaillet
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
| | - Guillaume Gabant
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
| | - Benjamin Brillet
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
| | - Luis Briseño-Roa
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
| | - Martine Cadene
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
| | - Corinne Augé-Gouillou
- Innovation Moléculaire Thérapeutique, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Université François Rabelais, 37200 Tours, France, Centre de Biophysique Moléculaire, UPR 4301 CNRS, Rue Charles Sadron, 45071 Orléans, France, Laboratoire Universitaire de Biodiversité et Ecologie Microbienne, IUT de Quimper, Université de Bretagne Occidentale, 6 rue de l’Université, 29000 Quimper, France and Biologie Cellulaire de la Synapse, INSERM U789, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France
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Pflieger A, Waffo Teguo P, Papastamoulis Y, Chaignepain S, Subra F, Munir S, Delelis O, Lesbats P, Calmels C, Andreola ML, Merillon JM, Auge-Gouillou C, Parissi V. Natural stilbenoids isolated from grapevine exhibiting inhibitory effects against HIV-1 integrase and eukaryote MOS1 transposase in vitro activities. PLoS One 2013; 8:e81184. [PMID: 24312275 PMCID: PMC3842960 DOI: 10.1371/journal.pone.0081184] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 10/18/2013] [Indexed: 01/07/2023] Open
Abstract
Polynucleotidyl transferases are enzymes involved in several DNA mobility mechanisms in prokaryotes and eukaryotes. Some of them such as retroviral integrases are crucial for pathogenous processes and are therefore good candidates for therapeutic approaches. To identify new therapeutic compounds and new tools for investigating the common functional features of these proteins, we addressed the inhibition properties of natural stilbenoids deriving from resveratrol on two models: the HIV-1 integrase and the eukaryote MOS-1 transposase. Two resveratrol dimers, leachianol F and G, were isolated for the first time in Vitis along with fourteen known stilbenoids: E-resveratrol, E-piceid, E-pterostilbene, E-piceatannol, (+)-E-ε-viniferin, E-ε-viniferinglucoside, E-scirpusin A, quadragularin A, ampelopsin A, pallidol, E-miyabenol C, E-vitisin B, hopeaphenol, and isohopeaphenol and were purified from stalks of Vitis vinifera (Vitaceae), and moracin M from stem bark of Milliciaexelsa (Moraceae). These compounds were tested in in vitro and in vivo assays reproducing the activity of both enzymes. Several molecules presented significant inhibition on both systems. Some of the molecules were found to be active against both proteins while others were specific for one of the two models. Comparison of the differential effects of the molecules suggested that the compounds could target specific intermediate nucleocomplexes of the reactions. Additionally E-pterostilbene was found active on the early lentiviral replication steps in lentiviruses transduced cells. Consequently, in addition to representing new original lead compounds for further modelling of new active agents against HIV-1 integrase, these molecules could be good tools for identifying such reaction intermediates in DNA mobility processes.
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Affiliation(s)
- Aude Pflieger
- Université François Rabelais de Tours, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Tours, France
| | - Pierre Waffo Teguo
- Groupe d'Etude des Substances Végétales à Activité Biologique, EA 3675 - UFR Pharmacie, Université Bordeaux Segalen, Institut des Sciences de la Vigne et du Vin (ISVV), Bordeaux, France
| | - Yorgos Papastamoulis
- Groupe d'Etude des Substances Végétales à Activité Biologique, EA 3675 - UFR Pharmacie, Université Bordeaux Segalen, Institut des Sciences de la Vigne et du Vin (ISVV), Bordeaux, France
| | - Stéphane Chaignepain
- Plateforme Protéome - Centre Génomique Fonctionnelle, UMR 5248 CBMN, Université Bordeaux Segalen, Bordeaux France
| | | | | | | | - Paul Lesbats
- Université François Rabelais de Tours, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Tours, France
- Cancer Research UK, London Research Institute, Clare Hall Laboratories, Potters Bar, United Kingdom
| | - Christina Calmels
- Laboratoire MFP, UMR 5234-CNRS, Université Bordeaux Segalen, Bordeaux, France
| | - Marie-Line Andreola
- Laboratoire MFP, UMR 5234-CNRS, Université Bordeaux Segalen, Bordeaux, France
| | - Jean-Michel Merillon
- Groupe d'Etude des Substances Végétales à Activité Biologique, EA 3675 - UFR Pharmacie, Université Bordeaux Segalen, Institut des Sciences de la Vigne et du Vin (ISVV), Bordeaux, France
| | - Corinne Auge-Gouillou
- Université François Rabelais de Tours, EA 6306, UFR Sciences Pharmaceutiques, Parc Grandmont, Tours, France
| | - Vincent Parissi
- Laboratoire MFP, UMR 5234-CNRS, Université Bordeaux Segalen, Bordeaux, France
- * E-mail:
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Pflieger A, Jaillet J, Petit A, Augé-Gouillou C, Renault S. Target capture during Mos1 transposition. J Biol Chem 2013; 289:100-11. [PMID: 24269942 DOI: 10.1074/jbc.m113.523894] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
DNA transposition contributes to genomic plasticity. Target capture is a key step in the transposition process, because it contributes to the selection of new insertion sites. Nothing or little is known about how eukaryotic mariner DNA transposons trigger this step. In the case of Mos1, biochemistry and crystallography have deciphered several inverted terminal repeat-transposase complexes that are intermediates during transposition. However, the target capture complex is still unknown. Here, we show that the preintegration complex (i.e., the excised transposon) is the only complex able to capture a target DNA. Mos1 transposase does not support target commitment, which has been proposed to explain Mos1 random genomic integrations within host genomes. We demonstrate that the TA dinucleotide used as the target is crucial both to target recognition and in the chemistry of the strand transfer reaction. Bent DNA molecules are better targets for the capture when the target DNA is nicked two nucleotides apart from the TA. They improve strand transfer when the target DNA contains a mismatch near the TA dinucleotide.
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Affiliation(s)
- Aude Pflieger
- From the EA 6306 Innovation Moléculaire et Thérapeutique, Université François Rabelais, UFR des Sciences et Techniques, UFR de Pharmacie, 37200 Tours, France
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Bire S, Casteret S, Arnaoty A, Piégu B, Lecomte T, Bigot Y. Transposase concentration controls transposition activity: myth or reality? Gene 2013; 530:165-71. [PMID: 23994686 DOI: 10.1016/j.gene.2013.08.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 07/25/2013] [Accepted: 08/12/2013] [Indexed: 12/11/2022]
Abstract
Deciphering the mechanisms underlying the regulation of DNA transposons might be central to understanding their function and dynamics in genomes. From results obtained under artificial experimental conditions, it has been proposed that some DNA transposons self-regulate their activity via overproduction inhibition (OPI), a mechanism by which transposition activity is down-regulated when the transposase is overconcentrated in cells. However, numerous studies have given contradictory results depending on the experimental conditions. Moreover, we do not know in which cellular compartment this phenomenon takes place, or whether transposases assemble to form dense foci when they are highly expressed in cells. In the present review, we focus on investigating the data available about eukaryotic transposons to explain the mechanisms underlying OPI. Data in the literature indicate that members of the IS630-Tc1-mariner, Hobo-Ac-Tam, and piggyBac superfamilies are able to use OPI to self-regulate their transposition activity in vivo in most eukaryotic cells, and that some of them are able to assemble so as to form higher order soluble oligomers. We also investigated the localization and behavior of GFP-fused transposases belonging to the mariner, Tc1-like, and piggyBac families, investigating their ability to aggregate in cells when they are overexpressed. Transposases are able to form dense foci when they are highly expressed. Moreover, the cellular compartments in which these foci are concentrated depend on the transposase, and on its expression. The data presented here suggest that sequestration in cytoplasmic or nucleoplasmic foci, or within the nucleoli, might protect the genome against the potentially genotoxic effects of the non-specific nuclease activities of eukaryotic transposases.
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Affiliation(s)
- Solenne Bire
- PRC, UMR INRA-CNRS 7247, Centre INRA Val de Loire, 37380 Nouzilly Cedex, France
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Esnault C, Chénais B, Casse N, Delorme N, Louarn G, Pilard JF. Electrochemically Modified Carbon and Chromium Surfaces for AFM Imaging of Double-Strand DNA Interaction with Transposase Protein. Chemphyschem 2013; 14:338-45. [DOI: 10.1002/cphc.201200885] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Indexed: 11/08/2022]
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Cuypers MG, Trubitsyna M, Callow P, Forsyth VT, Richardson JM. Solution conformations of early intermediates in Mos1 transposition. Nucleic Acids Res 2012; 41:2020-33. [PMID: 23262225 PMCID: PMC3561948 DOI: 10.1093/nar/gks1295] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
DNA transposases facilitate genome rearrangements by moving DNA transposons around and between genomes by a cut-and-paste mechanism. DNA transposition proceeds in an ordered series of nucleoprotein complexes that coordinate pairing and cleavage of the transposon ends and integration of the cleaved ends at a new genomic site. Transposition is initiated by transposase recognition of the inverted repeat sequences marking each transposon end. Using a combination of solution scattering and biochemical techniques, we have determined the solution conformations and stoichiometries of DNA-free Mos1 transposase and of the transposase bound to a single transposon end. We show that Mos1 transposase is an elongated homodimer in the absence of DNA and that the N-terminal 55 residues, containing the first helix-turn-helix motif, are required for dimerization. This arrangement is remarkably different from the compact, crossed architecture of the dimer in the Mos1 paired-end complex (PEC). The transposase remains elongated when bound to a single-transposon end in a pre-cleavage complex, and the DNA is bound predominantly to one transposase monomer. We propose that a conformational change in the single-end complex, involving rotation of one half of the transposase along with binding of a second transposon end, could facilitate PEC assembly.
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Affiliation(s)
- Maxime G Cuypers
- Life Sciences Group, Institut Laue Langevin (ILL), 6 rue Jules Horowitz, 38042 Grenoble, France
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12
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Jaillet J, Genty M, Cambefort J, Rouault JD, Augé-Gouillou C. Regulation of mariner transposition: the peculiar case of Mos1. PLoS One 2012; 7:e43365. [PMID: 22905263 PMCID: PMC3419177 DOI: 10.1371/journal.pone.0043365] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Accepted: 07/20/2012] [Indexed: 01/18/2023] Open
Abstract
Background Mariner elements represent the most successful family of autonomous DNA transposons, being present in various plant and animal genomes, including humans. The introduction and co-evolution of mariners within host genomes imply a strict regulation of the transposon activity. Biochemical data accumulated during the past decade have led to a convergent picture of the transposition cycle of mariner elements, suggesting that mariner transposition does not rely on host-specific factors. This model does not account for differences of transposition efficiency in human cells between mariners. We thus wondered whether apparent similarities in transposition cycle could hide differences in the intrinsic parameters that control mariner transposition. Principal Findings We find that Mos1 transposase concentrations in excess to the Mos1 ends prevent the paired-end complex assembly. However, we observe that Mos1 transposition is not impaired by transposase high concentration, dismissing the idea that transposase over production plays an obligatory role in the down-regulation of mariner transposition. Our main finding is that the paired-end complex is formed in a cooperative way, regardless of the transposase concentration. We also show that an element framed by two identical ITRs (Inverted Terminal Repeats) is more efficient in driving transposition than an element framed by two different ITRs (i.e. the natural Mos1 copy), the latter being more sensitive to transposase concentration variations. Finally, we show that the current Mos1 ITRs correspond to the ancestral ones. Conclusions We provide new insights on intrinsic properties supporting the self-regulation of the Mos1 element. These properties (transposase specific activity, aggregation, ITR sequences, transposase concentration/transposon copy number ratio…) could have played a role in the dynamics of host-genomes invasion by Mos1, accounting (at least in part) for the current low copy number of Mos1 within host genomes.
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Affiliation(s)
- Jérôme Jaillet
- Innovation Moléculaire Thérapeutique, EA 6306 – Université François Rabelais, Parc Grandmont, Tours, France
| | - Murielle Genty
- Innovation Moléculaire Thérapeutique, EA 6306 – Université François Rabelais, Parc Grandmont, Tours, France
| | - Jeanne Cambefort
- Innovation Moléculaire Thérapeutique, EA 6306 – Université François Rabelais, Parc Grandmont, Tours, France
| | - Jacques-Deric Rouault
- Laboratoire Evolution, Génomes et Spéciation – CNRS UPR9034, Gif-sur-Yvette, France
- Université Paris-Sud 11, Orsay, France
| | - Corinne Augé-Gouillou
- Innovation Moléculaire Thérapeutique, EA 6306 – Université François Rabelais, Parc Grandmont, Tours, France
- * E-mail:
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13
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Demattei MV, Hedhili S, Sinzelle L, Bressac C, Casteret S, Moiré N, Cambefort J, Thomas X, Pollet N, Gantet P, Bigot Y. Nuclear importation of Mariner transposases among eukaryotes: motif requirements and homo-protein interactions. PLoS One 2011; 6:e23693. [PMID: 21876763 PMCID: PMC3158080 DOI: 10.1371/journal.pone.0023693] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Accepted: 07/22/2011] [Indexed: 12/13/2022] Open
Abstract
Mariner-like elements (MLEs) are widespread transposable elements in animal genomes. They have been divided into at least five sub-families with differing host ranges. We investigated whether the ability of transposases encoded by Mos1, Himar1 and Mcmar1 to be actively imported into nuclei varies between host belonging to different eukaryotic taxa. Our findings demonstrate that nuclear importation could restrict the host range of some MLEs in certain eukaryotic lineages, depending on their expression level. We then focused on the nuclear localization signal (NLS) in these proteins, and showed that the first 175 N-terminal residues in the three transposases were required for nuclear importation. We found that two components are involved in the nuclear importation of the Mos1 transposase: an SV40 NLS-like motif (position: aa 168 to 174), and a dimerization sub-domain located within the first 80 residues. Sequence analyses revealed that the dimerization moiety is conserved among MLE transposases, but the Himar1 and Mcmar1 transposases do not contain any conserved NLS motif. This suggests that other NLS-like motifs must intervene in these proteins. Finally, we showed that the over-expression of the Mos1 transposase prevents its nuclear importation in HeLa cells, due to the assembly of transposase aggregates in the cytoplasm.
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Affiliation(s)
| | - Sabah Hedhili
- CIRAD, UMR 1098 Développement et Amélioration des Plantes, Montpellier, France
| | - Ludivine Sinzelle
- Metamorphosys, CNRS UPS3201-Université d'Evry Val d'Essonne, Genavenir 3 - Genopole Campus 1, Evry, France
| | | | - Sophie Casteret
- PRC, UMR INRA-CNRS 6175, Nouzilly, France
- GICC, UMR CNRS 6239, UFR des Sciences et Techniques, Tours, France
| | | | - Jeanne Cambefort
- GICC, UMR CNRS 6239, UFR des Sciences et Techniques, Tours, France
| | - Xavier Thomas
- GICC, UMR CNRS 6239, UFR des Sciences et Techniques, Tours, France
| | - Nicolas Pollet
- Metamorphosys, CNRS UPS3201-Université d'Evry Val d'Essonne, Genavenir 3 - Genopole Campus 1, Evry, France
| | - Pascal Gantet
- CIRAD, UMR 1098 Développement et Amélioration des Plantes, Montpellier, France
| | - Yves Bigot
- PRC, UMR INRA-CNRS 6175, Nouzilly, France
- * E-mail:
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