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Sanghavi HM, Majumdar S. Oligomerization of THAP9 Transposase via Amino-Terminal Domains. Biochemistry 2021; 60:1822-1835. [PMID: 34033475 DOI: 10.1021/acs.biochem.1c00010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Active DNA transposases like the Drosophila P element transposase (DmTNP) undergo oligomerization as a prerequisite for transposition. Human THAP9 (hTHAP9) is a catalytically active but functionally uncharacterized homologue of DmTNP. Here we report (using co-immunoprecipitation, pull down, colocalization, and proximity ligation assays) that both full length and truncated hTHAP9 (corresponding to amino-terminal DNA binding and predicted coiled coil domains) undergo homo-oligomerization, predominantly in the nuclei of HEK293T cells. Interestingly, the oligomerization is shown to be partially mediated by DNA. However, mutating the leucines (either individually or together) or deleting the predicted coiled coil region did not significantly affect oligomerization. Thus, we highlight the importance of DNA and the amino-terminal regions of hTHAP9 for their ability to form higher-order oligomeric states. We also report that Hcf-1, THAP1, THAP10, and THAP11 are possible protein interaction partners of hTHAP9. Elucidating the functional relevance of the different putative oligomeric state(s) of hTHAP9 would help answer questions about its interaction partners as well as its unknown physiological roles.
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Affiliation(s)
- Hiral M Sanghavi
- Discipline of Biological Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat 382355, India
| | - Sharmistha Majumdar
- Discipline of Biological Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat 382355, India
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2
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Robillard É, Le Rouzic A, Zhang Z, Capy P, Hua-Van A. Experimental evolution reveals hyperparasitic interactions among transposable elements. Proc Natl Acad Sci U S A 2016; 113:14763-14768. [PMID: 27930288 PMCID: PMC5187678 DOI: 10.1073/pnas.1524143113] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Transposable elements (TEs) are repeated DNA sequences that can constitute a substantial part of genomes. Studying TEs' activity, interactions, and accumulation dynamics is thus of major interest to understand genome evolution. Here, we describe the transposition dynamics of cut-and-paste mariner elements during experimental (short- and longer-term) evolution in Drosophila melanogaster Flies with autonomous and nonautonomous mariner copies were introduced in populations containing no active mariner, and TE accumulation was tracked by quantitative PCR for up to 100 generations. Our results demonstrate that (i) active mariner elements are highly invasive and characterized by an elevated transposition rate, confirming their capacity to spread in populations, as predicted by the "selfish-DNA" mechanism; (ii) nonautonomous copies act as parasites of autonomous mariner elements by hijacking the transposition machinery produced by active mariner, which can be considered as a case of hyperparasitism; (iii) this behavior resulted in a failure of active copies to amplify which systematically drove the whole family to extinction in less than 100 generations. This study nicely illustrates how the presence of transposition-competitive variants can deeply impair TE dynamics and gives clues to the extraordinary diversity of TE evolutionary histories observed in genomes.
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Affiliation(s)
- Émilie Robillard
- Évolution, Génomes, Comportement, Écologie, CNRS, Institut de Recherche pour le Développement, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Arnaud Le Rouzic
- Évolution, Génomes, Comportement, Écologie, CNRS, Institut de Recherche pour le Développement, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Zheng Zhang
- Évolution, Génomes, Comportement, Écologie, CNRS, Institut de Recherche pour le Développement, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Pierre Capy
- Évolution, Génomes, Comportement, Écologie, CNRS, Institut de Recherche pour le Développement, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
| | - Aurélie Hua-Van
- Évolution, Génomes, Comportement, Écologie, CNRS, Institut de Recherche pour le Développement, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette, France
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3
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Trubitsyna M, Grey H, Houston DR, Finnegan DJ, Richardson JM. Structural Basis for the Inverted Repeat Preferences of mariner Transposases. J Biol Chem 2015; 290:13531-40. [PMID: 25869132 PMCID: PMC4505599 DOI: 10.1074/jbc.m115.636704] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Indexed: 11/10/2022] Open
Abstract
The inverted repeat (IR) sequences delimiting the left and right ends of many naturally active mariner DNA transposons are non-identical and have different affinities for their transposase. We have compared the preferences of two active mariner transposases, Mos1 and Mboumar-9, for their imperfect transposon IRs in each step of transposition: DNA binding, DNA cleavage, and DNA strand transfer. A 3.1 Å resolution crystal structure of the Mos1 paired-end complex containing the pre-cleaved left IR sequences reveals the molecular basis for the reduced affinity of the Mos1 transposase DNA-binding domain for the left IR as compared with the right IR. For both Mos1 and Mboumar-9, in vitro DNA transposition is most efficient when the preferred IR sequence is present at both transposon ends. We find that this is due to the higher efficiency of cleavage and strand transfer of the preferred transposon end. We show that the efficiency of Mboumar-9 transposition is improved almost 4-fold by changing the 3′ base of the preferred Mboumar-9 IR from guanine to adenine. This preference for adenine at the reactive 3′ end for both Mos1 and Mboumar-9 may be a general feature of mariner transposition.
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Affiliation(s)
| | - Heather Grey
- Institute of Structural and Molecular Biology, School of Biological Sciences, University of Edinburgh, The King's Buildings, Max Born Crescent, Edinburgh EH9 3BF, Scotland, United Kingdom
| | - Douglas R Houston
- Institute of Structural and Molecular Biology, School of Biological Sciences, University of Edinburgh, The King's Buildings, Max Born Crescent, Edinburgh EH9 3BF, Scotland, United Kingdom
| | | | - Julia M Richardson
- Institute of Structural and Molecular Biology, School of Biological Sciences, University of Edinburgh, The King's Buildings, Max Born Crescent, Edinburgh EH9 3BF, Scotland, United Kingdom
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4
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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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5
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Barrón MG, Fiston-Lavier AS, Petrov DA, González J. Population genomics of transposable elements in Drosophila. Annu Rev Genet 2014; 48:561-81. [PMID: 25292358 DOI: 10.1146/annurev-genet-120213-092359] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Studies of the population dynamics of transposable elements (TEs) in Drosophila melanogaster indicate that consistent forces are affecting TEs independently of their modes of transposition and regulation. New sequencing technologies enable biologists to sample genomes at an unprecedented scale in order to quantify genome-wide polymorphism for annotated and novel TE insertions. In this review, we first present new insights gleaned from high-throughput data for population genomics studies of D. melanogaster. We then consider the latest population genomics models for TE evolution and present examples of functional evidence revealed by genome-wide studies of TE population dynamics in D. melanogaster. Although most of the TE insertions are deleterious or neutral, some TE insertions increase the fitness of the individual that carries them and play a role in genome adaptation.
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Affiliation(s)
- Maite G Barrón
- Institute of Evolutionary Biology (CSIC-Universitat Pompeu Fabra), Barcelona, Spain 08003; ,
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6
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Backfisch B, Kozin VV, Kirchmaier S, Tessmar-Raible K, Raible F. Tools for gene-regulatory analyses in the marine annelid Platynereis dumerilii. PLoS One 2014; 9:e93076. [PMID: 24714200 PMCID: PMC3979674 DOI: 10.1371/journal.pone.0093076] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 03/03/2014] [Indexed: 01/22/2023] Open
Abstract
The advent of high-throughput sequencing technology facilitates the exploration of a variety of reference species outside the few established molecular genetic model systems. Bioinformatic and gene expression analyses provide new ways for comparative analyses between species, for instance, in the field of evolution and development. Despite these advances, a critical bottleneck for the exploration of new model species remains the establishment of functional tools, such as the ability to experimentally express genes in specific cells of an organism. We recently established a first transgenic strain of the annelid Platynereis, using a Tc1/mariner-type Mos1 transposon vector. Here, we compare Mos1 with Tol2, a member of the hAT family of transposons. In Platynereis, Tol2-based constructs showed a higher frequency of nuclear genome insertion and sustained gene expression in the G0 generation. However, in contrast to Mos1-mediated transgenes, Tol2-mediated insertions failed to retain fluorescence in the G1 generation, suggesting a germ line-based silencing mechanism. Furthermore, we present three novel expression constructs that were generated by a simple fusion-PCR approach and allow either ubiquitous or cell-specific expression of a reporter gene. Our study indicates the versatility of Tol2 for transient transgenesis, and provides a template for transgenesis work in other emerging reference species.
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Affiliation(s)
- Benjamin Backfisch
- Max Ferdinand Perutz Laboratories (MFPL), University of Vienna, Vienna, Austria
- Research Platform “Marine Rhythms of Life,” University of Vienna, Vienna, Austria
| | - Vitaly V. Kozin
- Max Ferdinand Perutz Laboratories (MFPL), University of Vienna, Vienna, Austria
- Department of Embryology, St. Petersburg State University, St. Petersburg, Russia
| | - Stephan Kirchmaier
- Max Ferdinand Perutz Laboratories (MFPL), University of Vienna, Vienna, Austria
| | - Kristin Tessmar-Raible
- Max Ferdinand Perutz Laboratories (MFPL), University of Vienna, Vienna, Austria
- Research Platform “Marine Rhythms of Life,” University of Vienna, Vienna, Austria
| | - Florian Raible
- Max Ferdinand Perutz Laboratories (MFPL), University of Vienna, Vienna, Austria
- Research Platform “Marine Rhythms of Life,” University of Vienna, Vienna, Austria
- * E-mail:
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7
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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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8
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Skipper KA, Andersen PR, Sharma N, Mikkelsen JG. DNA transposon-based gene vehicles - scenes from an evolutionary drive. J Biomed Sci 2013; 20:92. [PMID: 24320156 PMCID: PMC3878927 DOI: 10.1186/1423-0127-20-92] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 11/27/2013] [Indexed: 12/12/2022] Open
Abstract
DNA transposons are primitive genetic elements which have colonized living organisms from plants to bacteria and mammals. Through evolution such parasitic elements have shaped their host genomes by replicating and relocating between chromosomal loci in processes catalyzed by the transposase proteins encoded by the elements themselves. DNA transposable elements are constantly adapting to life in the genome, and self-suppressive regulation as well as defensive host mechanisms may assist in buffering ‘cut-and-paste’ DNA mobilization until accumulating mutations will eventually restrict events of transposition. With the reconstructed Sleeping Beauty DNA transposon as a powerful engine, a growing list of transposable elements with activity in human cells have moved into biomedical experimentation and preclinical therapy as versatile vehicles for delivery and genomic insertion of transgenes. In this review, we aim to link the mechanisms that drive transposon evolution with the realities and potential challenges we are facing when adapting DNA transposons for gene transfer. We argue that DNA transposon-derived vectors may carry inherent, and potentially limiting, traits of their mother elements. By understanding in detail the evolutionary journey of transposons, from host colonization to element multiplication and inactivation, we may better exploit the potential of distinct transposable elements. Hence, parallel efforts to investigate and develop distinct, but potent, transposon-based vector systems will benefit the broad applications of gene transfer. Insight and clever optimization have shaped new DNA transposon vectors, which recently debuted in the first DNA transposon-based clinical trial. Learning from an evolutionary drive may help us create gene vehicles that are safer, more efficient, and less prone for suppression and inactivation.
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Affiliation(s)
| | | | | | - Jacob Giehm Mikkelsen
- Department of Biomedicine, Aarhus University, Wilh, Meyers Allé 4, DK-8000, Aarhus C, Denmark.
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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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10
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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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11
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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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