1
|
Nivet C, Custovic I, Avoscan L, Bikker FJ, Bonnotte A, Bourillot E, Briand L, Brignot H, Heydel JM, Herrmann N, Lelièvre M, Lesniewska E, Neiers F, Piétrement O, Schwartz M, Belloir C, Canon F. Development of New Models of Oral Mucosa to Investigate the Impact of the Structure of Transmembrane Mucin-1 on the Mucosal Pellicle Formation and Its Physicochemical Properties. Biomedicines 2024; 12:139. [PMID: 38255244 PMCID: PMC10812975 DOI: 10.3390/biomedicines12010139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 12/21/2023] [Accepted: 12/25/2023] [Indexed: 01/24/2024] Open
Abstract
The mucosal pellicle (MP) is a biological film protecting the oral mucosa. It is composed of bounded salivary proteins and transmembrane mucin MUC1 expressed by oral epithelial cells. Previous research indicates that MUC1 expression enhances the binding of the main salivary protein forming the MP, MUC5B. This study investigated the influence of MUC1 structure on MP formation. A TR146 cell line, which does not express MUC1 natively, was stably transfected with genes coding for three MUC1 isoforms differing in the structure of the two main extracellular domains: the VNTR domain, exhibiting a variable number of tandem repeats, and the SEA domain, maintaining the two bound subunits of MUC1. Semi-quantification of MUC1 using dot blot chemiluminescence showed comparable expression levels in all transfected cell lines. Semi-quantification of MUC5B by immunostaining after incubation with saliva revealed that MUC1 expression significantly increased MUC5B adsorption. Neither the VNTR domain nor the SEA domain was influenced MUC5B anchoring, suggesting the key role of the MUC1 N-terminal domain. AFM-IR nanospectroscopy revealed discernible shifts indicative of changes in the chemical properties at the cell surface due to the expression of the MUC1 isoform. Furthermore, the observed chemical shifts suggest the involvement of hydrophobic effects in the interaction between MUC1 and salivary proteins.
Collapse
Affiliation(s)
- Clément Nivet
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Irma Custovic
- Institut Carnot de Bourgogne (ICB), UMR CNRS 6303, University of Bourgogne, 21000 Dijon, France; (I.C.); (E.B.); (E.L.); (O.P.)
| | - Laure Avoscan
- Agroécologie, UMR1347 INRAE, ERL CNRS 6300, DimaCell Platform, Center of Microscopy INRAE, University of Bourgogne, 21000 Dijon, France; (L.A.); (A.B.)
| | - Floris J. Bikker
- Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam, University of Amsterdam and VU University Amsterdam, 1081 LA Amsterdam, The Netherlands;
| | - Aline Bonnotte
- Agroécologie, UMR1347 INRAE, ERL CNRS 6300, DimaCell Platform, Center of Microscopy INRAE, University of Bourgogne, 21000 Dijon, France; (L.A.); (A.B.)
| | - Eric Bourillot
- Institut Carnot de Bourgogne (ICB), UMR CNRS 6303, University of Bourgogne, 21000 Dijon, France; (I.C.); (E.B.); (E.L.); (O.P.)
| | - Loïc Briand
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Hélène Brignot
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Jean-Marie Heydel
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Noémie Herrmann
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Mélanie Lelièvre
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Eric Lesniewska
- Institut Carnot de Bourgogne (ICB), UMR CNRS 6303, University of Bourgogne, 21000 Dijon, France; (I.C.); (E.B.); (E.L.); (O.P.)
| | - Fabrice Neiers
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Olivier Piétrement
- Institut Carnot de Bourgogne (ICB), UMR CNRS 6303, University of Bourgogne, 21000 Dijon, France; (I.C.); (E.B.); (E.L.); (O.P.)
| | - Mathieu Schwartz
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Christine Belloir
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| | - Francis Canon
- Center for Taste and Feeding Behaviour (CSGA), UMR1324 INRAE, Institut Agro Dijon, Université de Bourgogne, UMR6265 CNRS, 21000 Dijon, France; (C.N.); (L.B.); (H.B.); (J.-M.H.); (N.H.); (M.L.); (F.N.); (M.S.); (C.B.)
| |
Collapse
|
2
|
Tarrés-Solé A, Battistini F, Gerhold JM, Piétrement O, Martínez-García B, Ruiz-López E, Lyonnais S, Bernadó P, Roca J, Orozco M, Le Cam E, Sedman J, Solà M. Structural analysis of the Candida albicans mitochondrial DNA maintenance factor Gcf1p reveals a dynamic DNA-bridging mechanism. Nucleic Acids Res 2023; 51:5864-5882. [PMID: 37207342 PMCID: PMC10287934 DOI: 10.1093/nar/gkad397] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 04/01/2023] [Accepted: 05/03/2023] [Indexed: 05/21/2023] Open
Abstract
The compaction of mitochondrial DNA (mtDNA) is regulated by architectural HMG-box proteins whose limited cross-species similarity suggests diverse underlying mechanisms. Viability of Candida albicans, a human antibiotic-resistant mucosal pathogen, is compromised by altering mtDNA regulators. Among them, there is the mtDNA maintenance factor Gcf1p, which differs in sequence and structure from its human and Saccharomyces cerevisiae counterparts, TFAM and Abf2p. Our crystallographic, biophysical, biochemical and computational analysis showed that Gcf1p forms dynamic protein/DNA multimers by a combined action of an N-terminal unstructured tail and a long helix. Furthermore, an HMG-box domain canonically binds the minor groove and dramatically bends the DNA while, unprecedentedly, a second HMG-box binds the major groove without imposing distortions. This architectural protein thus uses its multiple domains to bridge co-aligned DNA segments without altering the DNA topology, revealing a new mechanism of mtDNA condensation.
Collapse
Affiliation(s)
- Aleix Tarrés-Solé
- Structural MitoLab, Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona Science Park, Barcelona 08028, Spain
| | - Federica Battistini
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
- Department of Biochemistry, University of Barcelona, Barcelona 08028, Spain
| | - Joachim M Gerhold
- Institute of Molecular and Cell Biology, University of Tartu, Tartu 51010, Estonia
| | - Olivier Piétrement
- Genome Integrity and Cancer UMR 9019 CNRS, Université Paris Saclay, Gustave Roussy Campus, 114 rue Edouard Vaillant 94805VillejuifCedex, France
| | | | - Elena Ruiz-López
- Structural MitoLab, Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona Science Park, Barcelona 08028, Spain
| | - Sébastien Lyonnais
- Structural MitoLab, Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona Science Park, Barcelona 08028, Spain
| | - Pau Bernadó
- Centre de Biologie Structurale (CBS), Inserm, CNRS and Université de Montpellier, France, Sébastien Lyonnais, UAR 3725 CNRS, Université de Montpellier, 34000 Montpellier, France
| | - Joaquim Roca
- Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona 08028, Spain
| | - Modesto Orozco
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
- Department of Biochemistry, University of Barcelona, Barcelona 08028, Spain
| | - Eric Le Cam
- Genome Integrity and Cancer UMR 9019 CNRS, Université Paris Saclay, Gustave Roussy Campus, 114 rue Edouard Vaillant 94805VillejuifCedex, France
| | - Juhan Sedman
- Institute of Molecular and Cell Biology, University of Tartu, Tartu 51010, Estonia
| | - Maria Solà
- Structural MitoLab, Molecular Biology Institute Barcelona (IBMB-CSIC), Barcelona Science Park, Barcelona 08028, Spain
| |
Collapse
|
3
|
Brooks D, Piétrement O, Dardillac E, Jayantha A, Lores Guevara MA, Castro-Smirnov FA, Aranda P, Ruiz-Hitzky E, Lopez BS. Impact of Increased Sonication-Induced Dispersion of Sepiolite on Its Interaction with Biological Macromolecules and Toxicity/Proliferation in Human Cells. ACS Omega 2023; 8:1026-1036. [PMID: 36643441 PMCID: PMC9835666 DOI: 10.1021/acsomega.2c06391] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
Sepiolite is a natural clay silicate that is widely used, including biomedical applications; notably sepiolite shows promising features for the transfer of biological macromolecules into mammalian cells. However, before its use, such an approach should address the efficiency of binding to biological macromolecules and cell toxicity. Because sepiolite spontaneously forms aggregates, its disaggregation can represent an important challenge for improving the suspension performance and the assembly with biological species. However, this can also influence the toxicity of sepiolite in mammalian cells. Here, a very pure commercial sepiolite (Pangel S9), which is present as a partially defibrillated clay mineral, is used to study the consequences of additional deagglomeration/dispersion through sonication. We analyzed the impact of extra sonication on the dispersion of sepiolite aggregates. Factors such as sonication time, sonicator power, and temperature are taken into account. With increasing sonication time, a decrease in aggregation is observed, as well as a decrease in the length of the nanofibers monitored by atomic force microscopy. Changes in the temperature and pH of the solution are also observed during the sonication process. Moreover, although the adsorption capacity of bovine serum albumin (BSA) protein on sepiolite is increased with sonication time, the DNA adsorption efficiency remains unaffected. Finally, sonication of sepiolite decreases the hemolytic activity in blood cells and the toxicity in two different human cell lines. These data show that extra sonication of deagglomerated sepiolite can further favor its interaction with some biomacromolecules (e.g., BSA), and, in parallel, decrease sepiolite toxicity in mammalian cells. Therefore, sonication represents an alluring procedure for future biomedical applications of sepiolite, even when using commercial defibrillated particles.
Collapse
Affiliation(s)
- David
Adame Brooks
- Université
de Paris Cité, INSERM U1016, UMR 8104 CNRS, Institut Cochin,
Equipe Labellisée Ligue Contre le Cancer, 24 Rue Du Faubourg St. Jacques, Paris75014, France
- Centro
de Biofísica Médica, Universidad de Oriente, Patricio Lumumba S/NSantiago de Cuba, CP 90500, Cuba
| | - Olivier Piétrement
- Laboratoire
Interdisciplinaire Carnot de Bourgogne, CNRS UMR 6303, Université
de Bourgogne-Franche-Comté, 9 Avenue Alain Savary, Dijon Cedex21078, France
| | - Elodie Dardillac
- Université
de Paris Cité, INSERM U1016, UMR 8104 CNRS, Institut Cochin,
Equipe Labellisée Ligue Contre le Cancer, 24 Rue Du Faubourg St. Jacques, Paris75014, France
| | - Ayesha Jayantha
- Laboratoire
Interdisciplinaire Carnot de Bourgogne, CNRS UMR 6303, Université
de Bourgogne-Franche-Comté, 9 Avenue Alain Savary, Dijon Cedex21078, France
| | - Manuel A. Lores Guevara
- Centro
de Biofísica Médica, Universidad de Oriente, Patricio Lumumba S/NSantiago de Cuba, CP 90500, Cuba
| | | | - Pilar Aranda
- Instituto
de Ciencia de Materiales de Madrid, CSIC, c/Sor Juana Inés de la Cruz 3, Madrid28049, Spain
| | - Eduardo Ruiz-Hitzky
- Instituto
de Ciencia de Materiales de Madrid, CSIC, c/Sor Juana Inés de la Cruz 3, Madrid28049, Spain
| | - Bernard S. Lopez
- Université
de Paris Cité, INSERM U1016, UMR 8104 CNRS, Institut Cochin,
Equipe Labellisée Ligue Contre le Cancer, 24 Rue Du Faubourg St. Jacques, Paris75014, France
| |
Collapse
|
4
|
Maryjose N, Custovic I, Chaabane L, Lesniewska E, Piétrement O, Chambin O, Assifaoui A. Core-shell polygalacturonate magnetic iron oxide nanoparticles: Synthesis, characterization, and functionalities. Int J Biol Macromol 2022; 220:360-370. [PMID: 35932808 DOI: 10.1016/j.ijbiomac.2022.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This work aims to synthesize polygalacturonate-based magnetic iron oxide nanoparticles (INP-polyGalA). The synthesis consists of the diffusion of both Fe2+ and Fe3+ at a molar ratio of 1:2 through polyGalA solution followed by the addition of an alkaline solution. To form individual nanoparticle materials, the polyGalA concentration needs to be below its overlapping concentration (C*). The synthesized materials (INP-polyGalA) contain about 45 % of organic compound (polyGalA), and they have an average particle size ranging from 10 to 50 nm as estimated by several techniques (DLS, TEM and AFM) and their surfaces are negatively charged in pH range 2 to 7. The synthesized NPs showed magnetic characteristics, thanks to the formation of magnetite (Fe3O4) as confirmed by X-ray diffractions (XRD). Moreover, AFM combined with Infra-red mapping allowed us to conclude that polyGalA is located in the core of the nanoparticles but also on their surfaces. More specially, both carboxylate (COO-) and carboxylic (COOH) groups of polyGalA are observed on the NPs surfaces. The presence of such functional groups allowed the synthesized material to (i) bind through the electrostatic interactions methylene blue (MB) which may have a great potential for r pollution control or (ii) to form hydrogel beads (ionotropic gelation) by using calcium as a crosslinking agent which can be used to encapsulate active molecules and target their release by using an external stimulus (magnetic field).
Collapse
Affiliation(s)
- Navya Maryjose
- Université de Bourgogne Franche Comté (UBFC), Institut Agro Dijon, UMR PAM A 02.102, F-21000 Dijon, France
| | - Irma Custovic
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR CNRS 6303, Université de Bourgogne-Franche-Comté, 21078 Dijon Cedex, France
| | - Laroussi Chaabane
- Université de Bourgogne Franche Comté (UBFC), Institut Agro Dijon, UMR PAM A 02.102, F-21000 Dijon, France
| | - Eric Lesniewska
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR CNRS 6303, Université de Bourgogne-Franche-Comté, 21078 Dijon Cedex, France
| | - Olivier Piétrement
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR CNRS 6303, Université de Bourgogne-Franche-Comté, 21078 Dijon Cedex, France
| | - Odile Chambin
- Université de Bourgogne Franche Comté (UBFC), Institut Agro Dijon, UMR PAM A 02.102, F-21000 Dijon, France; Department of Pharmaceutical Technology, School of Pharmacy, Université de Bourgogne Franche Comté, 7 Bd Jeanne d'Arc, 21079 Dijon, France
| | - Ali Assifaoui
- Université de Bourgogne Franche Comté (UBFC), Institut Agro Dijon, UMR PAM A 02.102, F-21000 Dijon, France; Department of Pharmaceutical Technology, School of Pharmacy, Université de Bourgogne Franche Comté, 7 Bd Jeanne d'Arc, 21079 Dijon, France.
| |
Collapse
|
5
|
Abstract
Atomic force and transmission electron microscopies (AFM/TEM) are powerful tools to analyze RNA-based nanostructures. While cryo-TEM analysis allows the determination of near-atomic resolution structures of large RNA complexes, this chapter intends to present how RNA nanostructures can be analyzed at room temperature on surfaces. Indeed, TEM and AFM analyses permit the conformation of a large population of individual molecular structures to be observed, providing a statistical basis for the variability of these nanostructures within the population. Nevertheless, if double-stranded DNA molecular imaging has been described extensively, only a few investigations of single-stranded DNA and RNA filaments have been conducted so far. Indeed, technique for spreading and adsorption of ss-molecules on AFM surfaces or TEM grids is a crucial step to avoid disturbing RNA conformation on the surface. In this chapter, we present a specific method to analyze RNA assemblies and RNA-protein complexes for molecular microscopies.
Collapse
Affiliation(s)
- Olivier Piétrement
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS, Université de Bourgogne, Dijon Cedex, France
| | - Véronique Arluison
- Laboratoire Léon Brillouin LLB, CEA, CNRS UMR12, Université Paris Saclay, Gif-Sur-Yvette, France
- Université de Paris, Paris, France
| | - Christophe Lavelle
- Museum National d'Histoire Naturelle, CNRS UMR 7196/INSERM U1154, Paris, France.
| |
Collapse
|
6
|
Kladova OA, Bazlekowa-Karaban M, Baconnais S, Piétrement O, Ishchenko AA, Matkarimov BT, Iakovlev DA, Vasenko A, Fedorova OS, Le Cam E, Tudek B, Kuznetsov NA, Saparbaev M. The role of the N-terminal domain of human apurinic/apyrimidinic endonuclease 1, APE1, in DNA glycosylase stimulation. DNA Repair (Amst) 2018; 64:10-25. [PMID: 29475157 DOI: 10.1016/j.dnarep.2018.02.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Revised: 01/09/2018] [Accepted: 02/06/2018] [Indexed: 12/25/2022]
Abstract
The base excision repair (BER) pathway consists of sequential action of DNA glycosylase and apurinic/apyrimidinic (AP) endonuclease necessary to remove a damaged base and generate a single-strand break in duplex DNA. Human multifunctional AP endonuclease 1 (APE1, a.k.a. APEX1, HAP-1, or Ref-1) plays essential roles in BER by acting downstream of DNA glycosylases to incise a DNA duplex at AP sites and remove 3'-blocking sugar moieties at DNA strand breaks. Human 8-oxoguanine-DNA glycosylase (OGG1), methyl-CpG-binding domain 4 (MBD4, a.k.a. MED1), and alkyl-N-purine-DNA glycosylase (ANPG, a.k.a. Aag or MPG) excise a variety of damaged bases from DNA. Here we demonstrated that the redox-deficient truncated APE1 protein lacking the first N-terminal 61 amino acid residues (APE1-NΔ61) cannot stimulate DNA glycosylase activities of OGG1, MBD4, and ANPG on duplex DNA substrates. Electron microscopy imaging of APE1-DNA complexes revealed oligomerization of APE1 along the DNA duplex and APE1-mediated DNA bridging followed by DNA aggregation. APE1 polymerizes on both undamaged and damaged DNA in cooperative mode. Association of APE1 with undamaged DNA may enable scanning for damage; however, this event reduces effective concentration of the enzyme and subsequently decreases APE1-catalyzed cleavage rates on long DNA substrates. We propose that APE1 oligomers on DNA induce helix distortions thereby enhancing molecular recognition of DNA lesions by DNA glycosylases via a conformational proofreading/selection mechanism. Thus, APE1-mediated structural deformations of the DNA helix stabilize the enzyme-substrate complex and promote dissociation of human DNA glycosylases from the AP site with a subsequent increase in their turnover rate. SIGNIFICANCE STATEMENT The major human apurinic/apyrimidinic (AP) endonuclease, APE1, stimulates DNA glycosylases by increasing their turnover rate on duplex DNA substrates. At present, the mechanism of the stimulation remains unclear. We report that the redox domain of APE1 is necessary for the active mode of stimulation of DNA glycosylases. Electron microscopy revealed that full-length APE1 oligomerizes on DNA possibly via cooperative binding to DNA. Consequently, APE1 shows DNA length dependence with preferential repair of short DNA duplexes. We propose that APE1-catalyzed oligomerization along DNA induces helix distortions, which in turn enable conformational selection and stimulation of DNA glycosylases. This new biochemical property of APE1 sheds light on the mechanism of redox function and its role in DNA repair.
Collapse
Affiliation(s)
- Olga A Kladova
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk 630090, Russia
| | - Milena Bazlekowa-Karaban
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland; Groupe «Réparation de l'ADN», Equipe Labellisée par la Ligue Nationale contre le Cancer, CNRS UMR8200, Université Paris-Sud, Gustave Roussy Cancer Campus, F-94805 Villejuif Cedex, France; Institute of Genetics and Biotechnology, University of Warsaw, Warsaw, Poland
| | - Sonia Baconnais
- CNRS UMR8126, Université Paris-Sud, Université Paris-Saclay, Gustave Roussy, F-94805 Villejuif Cedex, France
| | - Olivier Piétrement
- CNRS UMR8126, Université Paris-Sud, Université Paris-Saclay, Gustave Roussy, F-94805 Villejuif Cedex, France
| | - Alexander A Ishchenko
- Groupe «Réparation de l'ADN», Equipe Labellisée par la Ligue Nationale contre le Cancer, CNRS UMR8200, Université Paris-Sud, Gustave Roussy Cancer Campus, F-94805 Villejuif Cedex, France
| | - Bakhyt T Matkarimov
- National laboratory Astana, Nazarbayev University, Astana 010000, Kazakhstan
| | - Danila A Iakovlev
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk 630090, Russia
| | - Andrey Vasenko
- National Research University Higher School of Economics, 101000 Moscow, Russia
| | - Olga S Fedorova
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk 630090, Russia
| | - Eric Le Cam
- CNRS UMR8126, Université Paris-Sud, Université Paris-Saclay, Gustave Roussy, F-94805 Villejuif Cedex, France
| | - Barbara Tudek
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland; Institute of Genetics and Biotechnology, University of Warsaw, Warsaw, Poland
| | - Nikita A Kuznetsov
- SB RAS Institute of Chemical Biology and Fundamental Medicine, Novosibirsk 630090, Russia.
| | - Murat Saparbaev
- Groupe «Réparation de l'ADN», Equipe Labellisée par la Ligue Nationale contre le Cancer, CNRS UMR8200, Université Paris-Sud, Gustave Roussy Cancer Campus, F-94805 Villejuif Cedex, France.
| |
Collapse
|
7
|
Piétrement O, Castro-Smirnov FA, Le Cam E, Aranda P, Ruiz-Hitzky E, Lopez BS. Sepiolite as a New Nanocarrier for DNA Transfer into Mammalian Cells: Proof of Concept, Issues and Perspectives. CHEM REC 2017; 18:849-857. [DOI: 10.1002/tcr.201700078] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 12/07/2017] [Indexed: 01/05/2023]
Affiliation(s)
- Olivier Piétrement
- CNRS UMR 8126; Université Paris-Sud, Université Paris-Saclay; Gustave Roussy, 114 Rue Edouard Vaillant 94805 Villejuif France
| | - Fidel Antonio Castro-Smirnov
- CNRS UMR 8200, team labeled “Ligue 2014”; Université Paris-Sud, Université Paris-Saclay; Gustave Roussy, 114 rue Edouard Vaillant 94805 Villejuif France
- Universidad de las Ciencias Informáticas; Carretera a San Antonio de los Baños, km 2 1/2 La Habana 19370 Cuba
| | - Eric Le Cam
- CNRS UMR 8126; Université Paris-Sud, Université Paris-Saclay; Gustave Roussy, 114 Rue Edouard Vaillant 94805 Villejuif France
| | - Pilar Aranda
- Instituto de Ciencia de Materiales de Madrid, CSIC; c/ Sor Juana Inés de la Cruz 3 28049 Madrid Spain
| | - Eduardo Ruiz-Hitzky
- Instituto de Ciencia de Materiales de Madrid, CSIC; c/ Sor Juana Inés de la Cruz 3 28049 Madrid Spain
| | - Bernard S. Lopez
- CNRS UMR 8200, team labeled “Ligue 2014”; Université Paris-Sud, Université Paris-Saclay; Gustave Roussy, 114 rue Edouard Vaillant 94805 Villejuif France
| |
Collapse
|
8
|
Castro-Smirnov FA, Ayache J, Bertrand JR, Dardillac E, Le Cam E, Piétrement O, Aranda P, Ruiz-Hitzky E, Lopez BS. Cellular uptake pathways of sepiolite nanofibers and DNA transfection improvement. Sci Rep 2017; 7:5586. [PMID: 28717157 PMCID: PMC5514060 DOI: 10.1038/s41598-017-05839-3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 06/05/2017] [Indexed: 11/09/2022] Open
Abstract
Sepiolite is a nanofibrous natural silicate that can be used as a nanocarrier because it can be naturally internalized into mammalian cells, due to its nano-size dimension. Therefore, deciphering the mechanisms of sepiolite cell internalization constitutes a question interesting biotechnology, for the use of sepiolite as nanocarrier, as well as environmental and public health concerns. Though it is low, the perfectly stable and natural intrinsic fluorescence of sepiolite nanofibers allows to follow their fate into cells by specifically sensitive technics. By combining fluorescence microscopy (including confocal analysis), time-lapse video microscopy, fluorescence activated cell sorting and transmission electron microscopy, we show that sepiolite can be spontaneously internalized into mammalian cells through both non-endocytic and endocytic pathways, macropinocytosis being one of the main pathways. Interestingly, exposure of the cells to endocytosis inhibitors, such as chloroquine, two-fold increase the efficiency of sepiolite-mediated gene transfer, in addition to the 100-fold increased resulting from sepiolite sonomechanical treatment. As sepiolite is able to bind various biological molecules, this nanoparticulate silicate could be a good candidate as a nanocarrier for simultaneous vectorization of diverse biological molecules.
Collapse
Affiliation(s)
- Fidel Antonio Castro-Smirnov
- CNRS UMR 8200, Gustave-Roussy, Université Paris-Saclay, team labeled "Ligue 2014", 114 rue Edouard Vaillant, 94805, Villejuif, France.,Universidad de las Ciencias Informáticas, Carretera a San Antonio de los Baños, km 2 1⁄2, La Habana, 19370, Cuba
| | - Jeanne Ayache
- CNRS UMR 8126, Gustave Roussy, Université Paris-Saclay, 94805, Villejuif, France
| | - Jean-Rémi Bertrand
- Vectorology and Anticancer therapies, CNRS UMR 8203, Gustave Roussy, Université Paris-Saclay, 94805, Villejuif, France
| | - Elodie Dardillac
- CNRS UMR 8200, Gustave-Roussy, Université Paris-Saclay, team labeled "Ligue 2014", 114 rue Edouard Vaillant, 94805, Villejuif, France
| | - Eric Le Cam
- CNRS UMR 8126, Gustave Roussy, Université Paris-Saclay, 94805, Villejuif, France
| | - Olivier Piétrement
- CNRS UMR 8126, Gustave Roussy, Université Paris-Saclay, 94805, Villejuif, France
| | - Pilar Aranda
- Instituto de Ciencia de Materiales de Madrid, CSIC, c/ Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain
| | - Eduardo Ruiz-Hitzky
- Instituto de Ciencia de Materiales de Madrid, CSIC, c/ Sor Juana Inés de la Cruz 3, 28049, Madrid, Spain
| | - Bernard S Lopez
- CNRS UMR 8200, Gustave-Roussy, Université Paris-Saclay, team labeled "Ligue 2014", 114 rue Edouard Vaillant, 94805, Villejuif, France.
| |
Collapse
|
9
|
McGovern S, Baconnais S, Roblin P, Nicolas P, Drevet P, Simonson H, Piétrement O, Charbonnier JB, Le Cam E, Noirot P, Lecointe F. C-terminal region of bacterial Ku controls DNA bridging, DNA threading and recruitment of DNA ligase D for double strand breaks repair. Nucleic Acids Res 2016; 44:4785-4806. [PMID: 26961308 PMCID: PMC4889933 DOI: 10.1093/nar/gkw149] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 07/19/2015] [Revised: 02/26/2016] [Accepted: 02/29/2016] [Indexed: 01/15/2023] Open
Abstract
Non-homologous end joining is a ligation process repairing DNA double strand breaks in eukaryotes and many prokaryotes. The ring structured eukaryotic Ku binds DNA ends and recruits other factors which can access DNA ends through the threading of Ku inward the DNA, making this protein a key ingredient for the scaffolding of the NHEJ machinery. However, this threading ability seems unevenly conserved among bacterial Ku. As bacterial Ku differ mainly by their C-terminus, we evaluate the role of this region in the loading and the threading abilities of Bacillus subtilis Ku and the stimulation of the DNA ligase LigD. We identify two distinct sub-regions: a ubiquitous minimal C-terminal region and a frequent basic C-terminal extension. We show that truncation of one or both of these sub-regions in Bacillus subtilis Ku impairs the stimulation of the LigD end joining activity in vitro. We further demonstrate that the minimal C-terminus is required for the Ku-LigD interaction, whereas the basic extension controls the threading and DNA bridging abilities of Ku. We propose that the Ku basic C-terminal extension increases the concentration of Ku near DNA ends, favoring the recruitment of LigD at the break, thanks to the minimal C-terminal sub-region.
Collapse
Affiliation(s)
- Stephen McGovern
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Sonia Baconnais
- UMR 8126, CNRS, Gustave Roussy Université Paris Sud, Université Paris-Saclay, F-94805 Villejuif, France
| | - Pierre Roblin
- SOLEIL Synchrotron, F- 91192 Gif-sur-Yvette, INRA-URBIA, F-44316 Nantes, France
| | - Pierre Nicolas
- MaIAGE, INRA, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Pascal Drevet
- I2BC, iBiTec-S, CEA Saclay, UMR 9198, F-91191 Gif-sur-Yvette, France
| | - Héloïse Simonson
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - Olivier Piétrement
- UMR 8126, CNRS, Gustave Roussy Université Paris Sud, Université Paris-Saclay, F-94805 Villejuif, France
| | | | - Eric Le Cam
- UMR 8126, CNRS, Gustave Roussy Université Paris Sud, Université Paris-Saclay, F-94805 Villejuif, France
| | - Philippe Noirot
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| | - François Lecointe
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
| |
Collapse
|
10
|
Méphon-Gaspard A, Boca M, Pioche-Durieu C, Desforges B, Burgo A, Hamon L, Piétrement O, Pastré D. Role of tau in the spatial organization of axonal microtubules: keeping parallel microtubules evenly distributed despite macromolecular crowding. Cell Mol Life Sci 2016; 73:3745-60. [PMID: 27076215 PMCID: PMC5002045 DOI: 10.1007/s00018-016-2216-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 03/24/2016] [Accepted: 04/01/2016] [Indexed: 02/07/2023]
Abstract
Opposing views have been proposed regarding the role of tau, the principal microtubule-associated protein in axons. On the one hand, tau forms cross-bridges at the interface between microtubules and induces microtubule bundling in neurons. On the other hand, tau is also considered a polymer brush which efficiently separates microtubules. In mature axons, microtubules are indeed arranged in parallel arrays and are well separated from each other. To reconcile these views, we developed a mechanistic model based on in vitro and cellular approaches combined to analytical and numerical analyses. The results indicate that tau forms long-range cross-bridges between microtubules under macromolecular crowding conditions. Tau cross-bridges prevent the redistribution of tau away from the interface between microtubules, which would have occurred in the polymer brush model. Consequently, the short-range attractive force between microtubules induced by macromolecular crowding is avoided and thus microtubules remain well separated from each other. Interestingly, in this unified model, tau diffusion on microtubules enables to keep microtubules evenly distributed in axonal sections at low tau levels.
Collapse
Affiliation(s)
- Alix Méphon-Gaspard
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR1204, Université Evry-Val d'Essonne, Evry, 91025, France
| | - Mirela Boca
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR1204, Université Evry-Val d'Essonne, Evry, 91025, France
| | - Catherine Pioche-Durieu
- UMR 8126, CNRS, Gustave Roussy Université Paris Sud, Université Paris-Saclay, Villejuif, 94805, France
| | - Bénédicte Desforges
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR1204, Université Evry-Val d'Essonne, Evry, 91025, France
| | - Andrea Burgo
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR1204, Université Evry-Val d'Essonne, Evry, 91025, France
| | - Loic Hamon
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR1204, Université Evry-Val d'Essonne, Evry, 91025, France
| | - Olivier Piétrement
- UMR 8126, CNRS, Gustave Roussy Université Paris Sud, Université Paris-Saclay, Villejuif, 94805, France
| | - David Pastré
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR1204, Université Evry-Val d'Essonne, Evry, 91025, France.
| |
Collapse
|
11
|
Clavé G, Chatelain G, Filoramo A, Gasparutto D, Saint-Pierre C, Le Cam E, Piétrement O, Guérineau V, Campidelli S. Synthesis of a multibranched porphyrin-oligonucleotide scaffold for the construction of DNA-based nano-architectures. Org Biomol Chem 2014; 12:2778-83. [PMID: 24668242 DOI: 10.1039/c4ob00202d] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The interest in the functionalization of oligonucleotides with organic molecules has grown considerably over the last decade. In this work, we report on the synthesis and characterization of porphyrin-oligonucleotide hybrids containing one to four DNA strands (P1-P4). The hybrid P4, which inserts one porphyrin and four DNA fragments, was combined with gold nanoparticles and imaged by transmission electron microscopy.
Collapse
Affiliation(s)
- Guillaume Clavé
- CEA Saclay, IRAMIS, NIMBE, Laboratoire d'Innovation en Chimie des Surfaces et Nanosciences (LICSEN), F-91191 Gif sur Yvette, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Bounedjah O, Desforges B, Wu TD, Pioche-Durieu C, Marco S, Hamon L, Curmi PA, Guerquin-Kern JL, Piétrement O, Pastré D. Free mRNA in excess upon polysome dissociation is a scaffold for protein multimerization to form stress granules. Nucleic Acids Res 2014; 42:8678-91. [PMID: 25013173 PMCID: PMC4117795 DOI: 10.1093/nar/gku582] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The sequence of events leading to stress granule assembly in stressed cells remains elusive. We show here, using isotope labeling and ion microprobe, that proportionally more RNA than proteins are present in stress granules than in surrounding cytoplasm. We further demonstrate that the delivery of single strand polynucleotides, mRNA and ssDNA, to the cytoplasm can trigger stress granule assembly. On the other hand, increasing the cytoplasmic level of mRNA-binding proteins like YB-1 can directly prevent the aggregation of mRNA by forming isolated mRNPs, as evidenced by atomic force microscopy. Interestingly, we also discovered that enucleated cells do form stress granules, demonstrating that the translocation to the cytoplasm of nuclear prion-like RNA-binding proteins like TIA-1 is dispensable for stress granule assembly. The results lead to an alternative view on stress granule formation based on the following sequence of events: after the massive dissociation of polysomes during stress, mRNA-stabilizing proteins like YB-1 are outnumbered by the burst of nonpolysomal mRNA. mRNA freed of ribosomes thus becomes accessible to mRNA-binding aggregation-prone proteins or misfolded proteins, which induces stress granule formation. Within the frame of this model, the shuttling of nuclear mRNA-stabilizing proteins to the cytoplasm could dissociate stress granules or prevent their assembly.
Collapse
Affiliation(s)
- Ouissame Bounedjah
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR829; Université Evry-Val d'Essonne, Evry 91025, France
| | - Bénédicte Desforges
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR829; Université Evry-Val d'Essonne, Evry 91025, France
| | - Ting-Di Wu
- Institut Curie, INSERM, U759, 91405 Orsay cedex, France
| | - Catherine Pioche-Durieu
- Centre National de la Recherche Scientifique (CNRS), UMR 8126; University of Paris Sud, 94805 Villejuif, France
| | - Sergio Marco
- Institut Curie, INSERM, U759, 91405 Orsay cedex, France
| | - Loic Hamon
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR829; Université Evry-Val d'Essonne, Evry 91025, France
| | - Patrick A Curmi
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR829; Université Evry-Val d'Essonne, Evry 91025, France
| | | | - Olivier Piétrement
- Centre National de la Recherche Scientifique (CNRS), UMR 8126; University of Paris Sud, 94805 Villejuif, France
| | - David Pastré
- Institut National de la Santé et de la Recherche Médicale (INSERM), UMR829; Université Evry-Val d'Essonne, Evry 91025, France
| |
Collapse
|
13
|
Yatsunyk LA, Piétrement O, Albrecht D, Tran PLT, Renčiuk D, Sugiyama H, Arbona JM, Aimé JP, Mergny JL. Guided assembly of tetramolecular G-quadruplexes. ACS Nano 2013; 7:5701-10. [PMID: 23763613 DOI: 10.1021/nn402321g] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nucleic acids are finding applications in nanotechnology as nanomaterials, mechanical devices, templates, and biosensors. G-quadruplex DNA, formed by π-π stacking of guanine (G) quartets, is an attractive alternative to regular B-DNA because of the kinetic and thermodynamic stability of quadruplexes. However, they suffer from a fatal flaw: the rules of recognition, i.e., the formation of a G-quartet in which four identical bases are paired, prevent the controlled assembly between different strands, leading to complex mixtures. In this report, we present the solution to this recognition problem. The proposed design combines two DNA elements: parallel-stranded duplexes and a quadruplex core. Parallel-stranded duplexes direct controlled assembly of the quadruplex core, and their strands present convenient points of attachments for potential modifiers. The exceptional stability of the quadruplex core provides integrity to the entire structure, which could be used as a building block for nucleic acid-based nanomaterials. As a proof of principle for the design's versatility, we assembled quadruplex-based 1D structures and visualized them using atomic force and transmission electron microscopy. Our findings pave the way to broader utilization of G-quadruplex DNA in structural DNA nanomaterials.
Collapse
|
14
|
Lyonnais S, Piétrement O, Chepelianski A, Guéron S, Lacroix L, Le Cam E, Mergny JL. Functionalization of DNA G-Wires for patterning and nanofabrication. ACTA ACUST UNITED AC 2010:689-90. [PMID: 18776567 DOI: 10.1093/nass/nrn348] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
DNA structures made of guanine tetrads present remarkable properties and are thus first choice candidates for applications in nanofabrication. Starting from the work of Kotlyar et al., we report here that the klenow exo(-) fragment of DNA polymerase I can extend poly(dG)-poly(dC) from various 5'-modified (dG)(10(-))(dC)(10) templates. This allows the production of end-functionalized four-stranded wires (G-Wires) assembled from the folding of poly(dG) strands. G-Wires bearing thiol moieties can be easily combed on Au and Pt surfaces, whereas a 5' single-stranded overhang of a random sequence provides the unique possibility to assemble complex structures for nanoconstruction purposes.
Collapse
Affiliation(s)
- Sébastien Lyonnais
- Muséum national d'Histoire naturelle USM 503, INSERM U565, CNRS UMR 5153, 43 rue Cuvier 75005 Paris, France.
| | | | | | | | | | | | | |
Collapse
|
15
|
Pastré D, Hamon L, Sorel I, Le Cam E, Curmi PA, Piétrement O. Specific DNA-protein interactions on mica investigated by atomic force microscopy. Langmuir 2010; 26:2618-2623. [PMID: 19791748 DOI: 10.1021/la902727b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
DNA processing by site-specific proteins on surface remains a challenging issue for nanobioscience applications and, in particular, for high-resolution imaging by atomic force microscopy (AFM). To obtain high-resolution conditions, mica, an atomically flat and negatively charged surface, is generally used. However, even though many specific DNA/protein interactions have already been observed by AFM, little is known about DNA accessibility to specific enzymes on mica. Here we measured the accessibility of adsorbed DNA to restriction endonucleases (EcoRI and EcoRV) using AFM. By increasing the concentration of divalent or multivalent salts, DNA adsorption on mica switches from weak to strong binding. Interestingly, while the accessibility of strongly bound DNA was inhibited, loosely adsorbed DNA was efficiently cleaved on mica. This result opens new perspective to study DNA/protein interaction by AFM or to modify specifically DNA on surface.
Collapse
Affiliation(s)
- David Pastré
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM/UEVE U829, Université d'Evry val d'Essonne, Evry F-91025, France.
| | | | | | | | | | | |
Collapse
|
16
|
Cayrol B, Geinguenaud F, Lacoste J, Busi F, Le Dérout J, Piétrement O, Le Cam E, Régnier P, Lavelle C, Arluison V. Auto-assembly of E. coli DsrA small noncoding RNA: Molecular characteristics and functional consequences. RNA Biol 2009; 6:434-45. [PMID: 19535898 DOI: 10.4161/rna.6.4.8949] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
RNA molecules are important factors involved in different cellular processes and have a multitude of roles in the cell. These roles include serving as a temporary copy of genes used for protein synthesis or functions in translational machinery. Interestingly, RNA is so far the only biological molecule that serves both as a catalyst (like proteins) and as information storage (like DNA). However, in contrast to proteins well known to be able to self-associate in order to maintain the architecture of the cell, such RNA polymers are not prevalent in cells and are usually not favored by the flexibility of this molecule. In this work, we present evidence that such a polymer of a natural RNA, the DsrA RNA, exists in the bacterial cell. DsrA is a small noncoding RNA (87 nucleotides) of Escherichia coli that acts by base-pairing to mRNA in order to control the translation and the turnover of some mRNA, including rpoS mRNA, which encodes the sigma(s) RNA polymerase subunit involved in bacterial stress response. A putative model is proposed for the structure of this RNA polymer. Although the function of this polymerization is not known completely, we propose that the formation of such a structure could be involved in the regulation of DsrA ncRNA concentration in vivo or in a quality control mechanism used by the cell to eliminate misfolded RNAs.
Collapse
Affiliation(s)
- Bastien Cayrol
- Laboratoire Jean Perrin, FRE 3231 CNRS-Univ Paris 6, Paris, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Busi F, Cayrol B, Lavelle C, LeDerout J, Piétrement O, Le Cam E, Geinguenaud F, Lacoste J, Régnier P, Arluison V. Auto-assembly as a new regulatory mechanism of noncoding RNA. Cell Cycle 2009; 8:952-4. [PMID: 19221499 DOI: 10.4161/cc.8.6.7905] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
|
18
|
Lyonnais S, Chung CL, Goux-Capes L, Escudé C, Piétrement O, Baconnais S, Le Cam E, Bourgoin JP, Filoramo A. A three-branched DNA template for carbon nanotube self-assembly into nanodevice configuration. Chem Commun (Camb) 2008:683-5. [PMID: 19322421 DOI: 10.1039/b810679g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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]
Abstract
We report here the first realization of an artificial branched DNA template where a single wall carbon nanotube is positioned with the necessary geometry of an individually gated field effect transistor.
Collapse
Affiliation(s)
- Sébastien Lyonnais
- Laboratoire d'Electronique Moléculaire, CEA Saclay, DSM/IRAMIS/SPEC, F-91191 Gif/Yvette, France
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Dupaigne P, Lavelle C, Justome A, Lafosse S, Mirambeau G, Lipinski M, Piétrement O, Le Cam E. Rad51 polymerization reveals a new chromatin remodeling mechanism. PLoS One 2008; 3:e3643. [PMID: 18982066 PMCID: PMC2574414 DOI: 10.1371/journal.pone.0003643] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Accepted: 10/11/2008] [Indexed: 12/26/2022] Open
Abstract
Rad51 protein is a well known protagonist of homologous recombination in eukaryotic cells. Rad51 polymerization on single-stranded DNA and its role in presynaptic filament formation have been extensively documented. Rad51 polymerizes also on double-stranded DNA but the significance of this filament formation remains unclear. We explored the behavior of Saccharomyces cerevisiae Rad51 on dsDNA and the influence of nucleosomes on Rad51 polymerization mechanism to investigate its putative role in chromatin accessibility to recombination machinery. We combined biochemical approaches, transmission electron microscopy (TEM) and atomic force microscopy (AFM) for analysis of the effects of the Rad51 filament on chromatinized templates. Quantitative analyses clearly demonstrated the occurrence of chromatin remodeling during nucleoprotein filament formation. During Rad51 polymerization, recombinase proteins moved all the nucleosomal arrays in front of the progressing filament. This polymerization process had a powerful remodeling effect, as Rad51 destabilized the nucleosomes along considerable stretches of DNA. Similar behavior was observed with RecA. Thus, recombinase polymerization is a powerful mechanism of chromatin remodeling. These remarkable features open up new possibilities for understanding DNA recombination and reveal new types of ATP-dependent chromatin dynamics.
Collapse
Affiliation(s)
- Pauline Dupaigne
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
| | - Christophe Lavelle
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
| | - Anthony Justome
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
| | - Sophie Lafosse
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
| | - Gilles Mirambeau
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Division de Biochimie, UFR des Sciences de la Vie, Univ. Pierre et Marie Curie, Paris, France
| | - Marc Lipinski
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
| | - Olivier Piétrement
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
- * E-mail: (OP); (ELC)
| | - Eric Le Cam
- CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, France
- Univ. Paris-Sud, Villejuif, France
- * E-mail: (OP); (ELC)
| |
Collapse
|
20
|
Pastré D, Hamon L, Mechulam A, Sorel I, Baconnais S, Curmi PA, Le Cam E, Piétrement O. Atomic Force Microscopy Imaging of DNA under Macromolecular Crowding Conditions. Biomacromolecules 2007; 8:3712-7. [DOI: 10.1021/bm700856u] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- David Pastré
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Loïc Hamon
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Alain Mechulam
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Isabelle Sorel
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Sonia Baconnais
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Patrick A. Curmi
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Eric Le Cam
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| | - Olivier Piétrement
- Laboratoire Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829/Université d’Evry EA3637, Rue du Père Jarlan, 91025 Evry Cedex, France, CNRS, Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 Interactions Moléculaires et Cancer, Institut de cancérologie Gustave Roussy, Villejuif, F-94805, France, and Université Paris Sud, Villejuif, F-94805, France
| |
Collapse
|
21
|
Mortier-Barrière I, Velten M, Dupaigne P, Mirouze N, Piétrement O, McGovern S, Fichant G, Martin B, Noirot P, Le Cam E, Polard P, Claverys JP. A key presynaptic role in transformation for a widespread bacterial protein: DprA conveys incoming ssDNA to RecA. Cell 2007; 130:824-36. [PMID: 17803906 DOI: 10.1016/j.cell.2007.07.038] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2007] [Revised: 05/25/2007] [Accepted: 07/13/2007] [Indexed: 11/15/2022]
Abstract
Natural transformation is a mechanism for genetic exchange in many bacterial genera. It proceeds through the uptake of exogenous DNA and subsequent homology-dependent integration into the genome. In Streptococcus pneumoniae, this integration requires the ubiquitous recombinase, RecA, and DprA, a protein of unknown function widely conserved in bacteria. To unravel the role of DprA, we have studied the properties of the purified S. pneumoniae protein and its Bacillus subtilis ortholog (Smf). We report that DprA and Smf bind cooperatively to single-stranded DNA (ssDNA) and that these proteins both self-interact and interact with RecA. We demonstrate that DprA-RecA-ssDNA filaments are produced and that these filaments catalyze the homology-dependent formation of joint molecules. Finally, we show that while the Escherichia coli ssDNA-binding protein SSB limits access of RecA to ssDNA, DprA lowers this barrier. We propose that DprA is a new member of the recombination-mediator protein family, dedicated to natural bacterial transformation.
Collapse
Affiliation(s)
- Isabelle Mortier-Barrière
- Laboratoire de Microbiologie et Génétique Moléculaires, UMR 5100 CNRS-Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 09, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Hamon L, Pastré D, Dupaigne P, Le Breton C, Le Cam E, Piétrement O. High-resolution AFM imaging of single-stranded DNA-binding (SSB) protein--DNA complexes. Nucleic Acids Res 2007; 35:e58. [PMID: 17392343 PMCID: PMC1885666 DOI: 10.1093/nar/gkm147] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
DNA in living cells is generally processed via the generation and the protection of single-stranded DNA involving the binding of ssDNA-binding proteins (SSBs). The studies of SSB-binding mode transition and cooperativity are therefore critical to many cellular processes like DNA repair and replication. However, only a few atomic force microscopy (AFM) investigations of ssDNA nucleoprotein filaments have been conducted so far. The point is that adsorption of ssDN A–SSB complexes on mica, necessary for AFM imaging, is not an easy task. Here, we addressed this issue by using spermidine as a binding agent. This trivalent cation induces a stronger adsorption on mica than divalent cations, which are commonly used by AFM users but are ineffective in the adsorption of ssDNA–SSB complexes. At low spermidine concentration (<0.3 mM), we obtained AFM images of ssDNA–SSB complexes (E. coli SSB, gp32 and yRPA) on mica at both low and high ionic strengths. In addition, partially or fully saturated nucleoprotein filaments were studied at various monovalent salt concentrations thus allowing the observation of SSB-binding mode transition. In association with conventional biochemical techniques, this work should make it possible to study the dynamics of DNA processes involving DNA–SSB complexes as intermediates by AFM.
Collapse
Affiliation(s)
- Loïc Hamon
- Laboratoire de Structure et Activité des Biomolécules Normales et Pathologiques, INSERM U829, Université d'Evry-Val d'Essonne EA3637, Evry, F-91025, France.
| | | | | | | | | | | |
Collapse
|
23
|
Sorel I, Piétrement O, Hamon L, Baconnais S, Cam EL, Pastré D. The EcoRI-DNA complex as a model for investigating protein-DNA interactions by atomic force microscopy. Biochemistry 2007; 45:14675-82. [PMID: 17144660 DOI: 10.1021/bi060293u] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Atomic force microscopy (AFM) is a technique widely used to image protein-DNA complexes, and its application has now been extended to the measurements of protein-DNA binding constants and specificities. However, the spreading of the protein-DNA complexes on a flat substrate, generally mica, is required prior to AFM imaging. The influence of the surface on protein-DNA interactions is therefore an issue which needs to be addressed. For that purpose, the extensively studied EcoRI-DNA complex was investigated with the aim of providing quantitative information about the surface influence. The equilibrium binding constant of the complex was determined by AFM at both low and high ionic strengths and compared to electrophoretic mobility shift assay measurements (EMSA). In addition, the effect of the DNA length on dissociation of the protein from its specific site was analyzed. It turned out that the AFM measurements are similar to those obtained by EMSA at high ionic strengths. We then advance the idea that this effect is due to the high counterion concentration near the highly negatively charged mica surface. In addition, a dissociation of the complexes once they are adsorbed onto the surface was observed, which is weakly dependent on the ionic strength contrary to what occurs in solution. Finally, a two-step mechanism, which describes the adsorption of the EcoRI-DNA complexes on the surface, is proposed. This model could also be extended to other protein-DNA complexes.
Collapse
Affiliation(s)
- Isabelle Sorel
- Laboratoire Structures et Reconnaissance des Biomolécules, EA 3637, Université d'Evry, Rue du Père Jarlan, 91025 Evry Cedex, France
| | | | | | | | | | | |
Collapse
|
24
|
Pastré D, Hamon L, Landousy F, Sorel I, David MO, Zozime A, Le Cam E, Piétrement O. Anionic polyelectrolyte adsorption on mica mediated by multivalent cations: a solution to DNA imaging by atomic force microscopy under high ionic strengths. Langmuir 2006; 22:6651-60. [PMID: 16831009 DOI: 10.1021/la053387y] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Adsorption of DNA molecules on mica, a highly negatively charged surface, mediated by divalent or trivalent cations is considered. By analyzing atomic force microscope (AFM) images of DNA molecules adsorbed on mica, phase diagrams of DNA molecules interacting with a mica surface are established in terms of concentrations of monovalent salt (NaCl) and divalent (MgCl2) or multivalent (spermidine, cobalt hexamine) salts. These diagrams show two transitions between nonadsorption and adsorption. The first one arises when the concentration of multivalent counterions is larger than a limit value, which is not sensitive to the monovalent salt concentration. The second transition is due to the binding competition between monovalent and multivalent counterions. In addition, we develop a model of polyelectrolyte adsorption on like-charged surfaces with multivalent counterions. This model shows that the correlations of the multivalent counterions at the interface between DNA and mica play a critical role. Furthermore, it appears that DNA adsorption takes place when the energy gain in counterion correlations overcomes an energy barrier. This barrier is induced by the entropy loss in confining DNA in a thin adsorbed layer, the entropy loss in the interpenetration of the clouds of mica and DNA counterions, and the electrostatic repulsion between DNA and mica. The analysis of the experimental results provides an estimation of this energy barrier. We then discuss some important issues, including DNA adsorption under physiological conditions.
Collapse
Affiliation(s)
- David Pastré
- Laboratoire Structure et Reconnaissance des Biomolécules, EA 3637, Université d'Evry, Rue du Père Jarlan, 91025 Evry Cedex, France.
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Pastré D, Piétrement O, Landousy F, Hamon L, Sorel I, David MO, Delain E, Zozime A, Le Cam E. A new approach to DNA bending by polyamines and its implication in DNA condensation. Eur Biophys J 2005; 35:214-23. [PMID: 16247626 DOI: 10.1007/s00249-005-0025-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2005] [Revised: 07/28/2005] [Accepted: 08/02/2005] [Indexed: 11/30/2022]
Abstract
Polyamines are known to induce dynamical bending of DNA molecules. This mechanism is very important since many DNA binding proteins (DNAse, transcription factor, etc.) exert their action by their ability to bend DNA. We propose an analytical model which describes the dynamical bending of DNA by polyamine ions in highly diluted DNA solutions. The bending probability depends on the entropy loss of polyamines due to their localization. This localization is facilitated by the electrostatic repulsion between multivalent counterions condensed on DNA, which reduces the entropy loss in counterion localization. Therefore DNA bending by polyamines depends on the competition between monovalent counterions and polyamines. We find that the bending probability is weak for a low binding ratio of polyamines (i.e. number of bound polyamines per base pair), whereas a high bending probability can be reached at large polyamine binding ratio. In addition, we describe a new mechanism of DNA bending. It occurs with the help of thermal agitation, which initiates the bending and favours the polyamine localization. This model provides further insights into DNA bending by polyamines and its implication in DNA condensation. A qualitative estimation of the DNA bending probability is obtained by measuring the cleavage efficiency of DNA by bleomycin versus spermidine concentration. Indeed, a local helix distortion by polyamines results in an amplification of the double-strand cleavage by bleomycin. The measurement of the bleomycin amplification is performed by analysing images of DNA molecules with atomic force microscope. Some features of the dynamical bending indicate that condensation and bending are interrelated.
Collapse
Affiliation(s)
- David Pastré
- Laboratoire d'Etude des Milieux Nanométriques, Université d'Evry, Rue du Père Jarlan, 91025 Evry Cedex, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Pastré D, Piétrement O, Zozime A, Le Cam E. Study of the DNA/ethidium bromide interactions on mica surface by atomic force microscope: influence of the surface friction. Biopolymers 2005; 77:53-62. [PMID: 15578645 DOI: 10.1002/bip.20185] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The influence of mica surface on DNA/ethidium bromide interactions is investigated by atomic force microscopy (AFM). We describe the diffusion mechanism of a DNA molecule on a mica surface by using a simple analytical model. It appears that the DNA diffusion on a mica surface is limited by the surface friction due to the counterion correlations between the divalent counterions condensed on both mica and DNA surfaces. We also study the structural changes of linear DNA adsorbed on mica upon ethidium bromide binding by AFM. It turns out that linear DNA molecules adsorbed on a mica surface are unable to relieve the topological constraint upon ethidium bromide binding. In particular, strongly adsorbed molecules tend to be highly entangled, while loosely bound DNA molecules appear more extended with very few crossovers. Adsorbed DNA molecules cannot move freely on the surface because of the surface friction. Therefore, the topological constraint increases due to the ethidium bromide binding. Moreover, we show that ethidium bromide has a lower affinity for strongly bound molecules due to the topological constraint induced by the surface friction.
Collapse
Affiliation(s)
- David Pastré
- Laboratoire d'étude des Milieux Nanométriques, Université d'Evry-Val-d'essonne Rue du Père Jarlan, 91025 Evry Cedex, France.
| | | | | | | |
Collapse
|
27
|
Piétrement O, Pastré D, Landousy F, David MO, Fusil S, Hamon L, Zozime A, Le Cam E. Studying the effect of a charged surface on the interaction of bleomycin with DNA using an atomic force microscope. Eur Biophys J 2004; 34:200-7. [PMID: 15536564 DOI: 10.1007/s00249-004-0443-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2004] [Revised: 09/10/2004] [Accepted: 09/16/2004] [Indexed: 10/26/2022]
Abstract
The cleavage of DNA caused by the antitumoral drug bleomycin has been investigated using atomic force microscopy (AFM). This work deals with the effect that adsorbing DNA onto a positively- or negatively-charged surface has on the double-strand cleavage of DNA by Fe(III)/bleomycin. Quantitative analysis of the number of breaks per DNA molecule, in bulk and at the surface of the mica substrate, has been performed by analyzing AFM images. It turns out that the cleavage of DNA is strongly inhibited by a positively-charged surface. Our experiments can be interpreted using a simple electrostatic model. This paper is a first step in the study of DNA accessibility to ligand such as bleomycin, using AFM in liquids.
Collapse
Affiliation(s)
- Olivier Piétrement
- Laboratoire de Microscopie Moléculaire et Cellulaire, UMR 8126 CNRS-IGR-UPS, Institut Gustave-Roussy, 39 rue Camille Desmoulins, 94805 Villejuif Cedex, France.
| | | | | | | | | | | | | | | |
Collapse
|
28
|
Pastré D, Piétrement O, Fusil S, Landousy F, Jeusset J, David MO, Hamon L, Le Cam E, Zozime A. Adsorption of DNA to mica mediated by divalent counterions: a theoretical and experimental study. Biophys J 2004; 85:2507-18. [PMID: 14507713 PMCID: PMC1303474 DOI: 10.1016/s0006-3495(03)74673-6] [Citation(s) in RCA: 152] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The adsorption of DNA molecules onto a flat mica surface is a necessary step to perform atomic force microscopy studies of DNA conformation and observe DNA-protein interactions in physiological environment. However, the phenomenon that pulls DNA molecules onto the surface is still not understood. This is a crucial issue because the DNA/surface interactions could affect the DNA biological functions. In this paper we develop a model that can explain the mechanism of the DNA adsorption onto mica. This model suggests that DNA attraction is due to the sharing of the DNA and mica counterions. The correlations between divalent counterions on both the negatively charged DNA and the mica surface can generate a net attraction force whereas the correlations between monovalent counterions are ineffective in the DNA attraction. DNA binding is then dependent on the fractional surface densities of the divalent and monovalent cations, which can compete for the mica surface and DNA neutralizations. In addition, the attraction can be enhanced when the mica has been pretreated by transition metal cations (Ni(2+), Zn(2+)). Mica pretreatment simultaneously enhances the DNA attraction and reduces the repulsive contribution due to the electrical double-layer force. We also perform end-to-end distance measurement of DNA chains to study the binding strength. The DNA binding strength appears to be constant for a fixed fractional surface density of the divalent cations at low ionic strength (I < 0.1 M) as predicted by the model. However, at higher ionic strength, the binding is weakened by the screening effect of the ions. Then, some equations were derived to describe the binding of a polyelectrolyte onto a charged surface. The electrostatic attraction due to the sharing of counterions is particularly effective if the polyelectrolyte and the surface have nearly the same surface charge density. This characteristic of the attraction force can explain the success of mica for performing single DNA molecule observation by AFM. In addition, we explain how a reversible binding of the DNA molecules can be obtained with a pretreated mica surface.
Collapse
Affiliation(s)
- David Pastré
- Laboratoire Milieux Nanométriques, Université d'Evry, 91025 Evry Cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Piétrement O, Troyon M. Quantitative study of shear modulus and interfacial shear strength by combining modulated lateral force and magnetic force modulation microscopies. SURF INTERFACE ANAL 2001. [DOI: 10.1002/sia.1142] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
30
|
Abstract
Continuum mechanics models describing the contact between two adhesive elastic spheres, such as the JKR and DMT models, provide a relationship between the elastic indentation depth and the normal load, but the general intermediate case between these two limiting cases requires a more complex analysis. The Maugis-Dugdale theory gives analytical solutions, but they are difficult to use when comparing to experimental data such as those obtained by scanning force microscopy. In this paper we propose a generalized equation between elastic indentation depth and load that approximates Maugis' solution very closely. If the normal contact stiffness can be described as the force gradient, that is the case of the force modulation microcopy, then a generalized equation between normal contact stiffness and load can be deduced. Both general equations can be easily fit to experimental data, and then interfacial energy and elastic modulus of the contact can be determined if the radius of the indenting sphere is known. Copyright 2000 Academic Press.
Collapse
Affiliation(s)
- O. Piétrement
- Unité de Thermique et Analyse Physique, Université de Reims, rue Clément Ader, Reims Cedex 2, 51685, France
| | | |
Collapse
|