1
|
Berkal MA, Palas Q, Ricard E, Lartigau-Dagron C, Ronga L, Toulmé JJ, Parat C, Nardin C. Glyphosate-Exonuclease Interactions: Reduced Enzymatic Activity as a Route to Glyphosate Biosensing. Macromol Biosci 2023; 23:e2200508. [PMID: 36808212 DOI: 10.1002/mabi.202200508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 01/13/2023] [Indexed: 02/23/2023]
Abstract
N-phosphonomethyle-glycine (glyphosate) is the most widely used pesticide worldwide due to its effectiveness in killing weeds at a moderate cost, bringing significant economic benefits. However, owing to its massive use, glyphosate and its residues contaminate surface waters. On site, fast monitoring of contamination is therefore urgently needed to alert local authorities and raise population awareness. Here the hindrance of the activity of two enzymes, the exonuclease I (Exo I) and the T5 exonuclease (T5 Exo) by glyphosate, is reported. These two enzymes digest oligonucleotides into shorter sequences, down to single nucleotides. The presence of glyphosate in the reaction medium hampers the activity of both enzymes, slowing down enzymatic digestion. It is shown by fluorescence spectroscopy that the inhibition of ExoI enzymatic activity is specific to glyphosate, paving the way for the development of a biosensor to detect this pollutant in drinking water at suitable detection limits, i.e., 0.6 nm.
Collapse
Affiliation(s)
| | - Quentin Palas
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| | - Estelle Ricard
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| | | | - Luisa Ronga
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| | - Jean-Jacques Toulmé
- ARNA Laboratory, Inserm U1212, CNRS UMR5320, University of Bordeaux, Bordeaux, 33076, France
- Novaptech, 146 rue Léo Saignat, Bordeaux, 33076, France
| | - Corinne Parat
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| | - Corinne Nardin
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, Pau, France
| |
Collapse
|
2
|
Zara L, Achilli S, Chovelon B, Fiore E, Toulmé JJ, Peyrin E, Ravelet C. Anti-pesticide DNA aptamers fail to recognize their targets with asserted micromolar dissociation constants. Anal Chim Acta 2021; 1159:338382. [PMID: 33867041 DOI: 10.1016/j.aca.2021.338382] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 03/07/2021] [Accepted: 03/08/2021] [Indexed: 01/28/2023]
Abstract
Herein, we originally aimed at developing fluorescence anisotropy biosensor platforms devoted to the homogeneous-phase detection of isocarbophos and phorate pesticides by using previously isolated DNA aptamers. To achieve this, two reporting approaches displaying very high generalizability features were implemented, based on either the complementary strand or the SYBR green intercalator displacement strategies. Unfortunately, none of the transduction methods led to phorate-dependent signals. Only the SYBR green displacement method provided a small output in the presence of isocarbophos, but at an analyte concentration greater than 100 μM. In order to identify the origin of such data, isothermal titration calorimetry (ITC) experiments were subsequently performed. It was shown that aptamers bind neither isocarbophos nor phorate in free solution with the claimed micromolar dissociation constants. This work puts forward some doubts about the previously described aptasensors that rely on the use of these functional DNA molecules. It also highlights the need to carefully investigate the binding capabilities of aptamers after their isolation and to include appropriate control experiments with scrambled or mutated oligonucleotides.
Collapse
Affiliation(s)
- Lorena Zara
- Univ. Grenoble Alpes, CNRS, DPM, 38000, Grenoble, France; Novaptech, 2 Allée Du Doyen Georges Brus, 33600, Pessac, France
| | - Silvia Achilli
- Univ. Grenoble Alpes, CNRS, DPM, 38000, Grenoble, France
| | - Benoît Chovelon
- Univ. Grenoble Alpes, CNRS, DPM, 38000, Grenoble, France; Service de Biochimie, Biologie Moléculaire, Toxicologie Environnementale, CHU de Grenoble-Alpes Site Nord- Institut de Biologie et de Pathologie, La Tronche, France
| | | | | | - Eric Peyrin
- Univ. Grenoble Alpes, CNRS, DPM, 38000, Grenoble, France.
| | | |
Collapse
|
3
|
Sett A, Zara L, Dausse E, Toulmé JJ. Engineering Light-Up Aptamers for the Detection of RNA Hairpins through Kissing Interaction. Anal Chem 2020; 92:9113-9117. [PMID: 32498509 DOI: 10.1021/acs.analchem.0c01378] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Aptasensors are biosensors that include aptamers for detecting a target of interest. We engineered signaling aptasensors for the detection of RNA hairpins from the previously described malachite green (MG) RNA aptamer. The top part of this imperfect hairpin aptamer was modified in such a way that it can engage loop-loop (so-called kissing) interactions with RNA hairpins displaying partly complementary apical loops. These newly derived oligonucleotides named malaswitches bind their cognate fluorogenic ligand (MG) exclusively when RNA-RNA kissing complexes are formed, whereas MG does not bind to malaswitches alone. Consequently, the formation of the ternary target RNA-malaswitch RNA-MG complex results in fluorescence emission, and malaswitches constitute sensors for detecting RNA hairpins. Malaswitches were designed that specifically detect precursors of microRNAs let7b and miR-206.
Collapse
Affiliation(s)
- Arghya Sett
- ARNA Laboratory, Inserm U1212, CNRS UMR5320, University of Bordeaux, 33076 Bordeaux, France
| | - Lorena Zara
- ARNA Laboratory, Inserm U1212, CNRS UMR5320, University of Bordeaux, 33076 Bordeaux, France.,Novaptech, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Eric Dausse
- ARNA Laboratory, Inserm U1212, CNRS UMR5320, University of Bordeaux, 33076 Bordeaux, France
| | - Jean-Jacques Toulmé
- ARNA Laboratory, Inserm U1212, CNRS UMR5320, University of Bordeaux, 33076 Bordeaux, France.,Novaptech, 146 rue Léo Saignat, 33076 Bordeaux, France
| |
Collapse
|
4
|
Azéma L, Bonnet-Salomon S, Endo M, Takeuchi Y, Durand G, Emura T, Hidaka K, Dausse E, Sugiyama H, Toulmé JJ. Triggering nucleic acid nanostructure assembly by conditional kissing interactions. Nucleic Acids Res 2019; 46:1052-1058. [PMID: 29272518 PMCID: PMC5814900 DOI: 10.1093/nar/gkx1267] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 12/07/2017] [Indexed: 02/07/2023] Open
Abstract
Nucleic acids are biomolecules of amazing versatility. Beyond their function for information storage they can be used for building nano-objects. We took advantage of loop–loop or kissing interactions between hairpin building blocks displaying complementary loops for driving the assembly of nucleic acid nano-architectures. It is of interest to make the interaction between elementary units dependent on an external trigger, thus allowing the control of the scaffold formation. To this end we exploited the binding properties of structure-switching aptamers (aptaswitch). Aptaswitches are stem–loop structured oligonucleotides that engage a kissing complex with an RNA hairpin in response to ligand-induced aptaswitch folding. We demonstrated the potential of this approach by conditionally assembling oligonucleotide nanorods in response to the addition of adenosine.
Collapse
Affiliation(s)
- Laurent Azéma
- University of Bordeaux, CNRS UMR 5320, INSERM U1212, Bordeaux 33076, France
| | | | - Masayuki Endo
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.,Institute for Integrated Cell-Material Science, Kyoto University, Kyoto 606-8501, Japan
| | - Yosuke Takeuchi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Guillaume Durand
- University of Bordeaux, CNRS UMR 5320, INSERM U1212, Bordeaux 33076, France
| | - Tomoko Emura
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Kumi Hidaka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Eric Dausse
- University of Bordeaux, CNRS UMR 5320, INSERM U1212, Bordeaux 33076, France
| | - Hiroshi Sugiyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.,Institute for Integrated Cell-Material Science, Kyoto University, Kyoto 606-8501, Japan
| | | |
Collapse
|
5
|
Toulmé JJ, Azéma L, Darfeuille F, Dausse E, Durand G, Paurelle O. Aptamers in Bordeaux 2017: An exceptional "millésime". Biochimie 2017; 145:2-7. [PMID: 29180020 DOI: 10.1016/j.biochi.2017.11.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 11/22/2017] [Indexed: 01/09/2023]
Abstract
About 150 participants attended the symposium organised at the Palais de la Bourse in Bordeaux, France on September 22-23, 2017. Thirty speakers from all over the world delivered lectures covering selection processes, aptamer chemistry and innovative applications of these powerful tools that display major advantages over antibodies. Beyond the remarkable science presented, lively discussion and fruitful exchange between participants made this meeting a great success. A series of lectures were focused on synthetic biology (riboswitches, new synthetic base pairs, mutated polymerases). Innovative selection procedures including functional screening of oligonucleotide pools were described. Examples of aptasensors for the detection of pathogens were reported. The potential of aptamers for the diagnostic and the treatment of diseases was also presented. Brief summaries of the lectures presented during the symposium are given in this report. The third edition of this symposium will take place in Boulder, Colorado in Summer 2018 (information available at http://www.aptamers-in-bordeaux.com/).
Collapse
Affiliation(s)
- Jean-Jacques Toulmé
- ARNA Laboratory, University of Bordeaux, 33076 Bordeaux, France; Novaptech, 2 Allée du Doyen George Brus, 33600 Pessac, France.
| | - Laurent Azéma
- ARNA Laboratory, University of Bordeaux, 33076 Bordeaux, France
| | | | - Eric Dausse
- ARNA Laboratory, University of Bordeaux, 33076 Bordeaux, France
| | - Guillaume Durand
- Department Feed and Food, Bordeaux Sciences Agro, 1 cours du Général de Gaulle, 33175 Gradignan, France
| | | |
Collapse
|
6
|
Abi-Ghanem J, Rabin C, Porrini M, Dausse E, Toulmé JJ, Gabelica V. Electrostatics Explains the Position-Dependent Effect of G⋅U Wobble Base Pairs on the Affinity of RNA Kissing Complexes. Chemphyschem 2017; 18:2782-2790. [PMID: 28762245 DOI: 10.1002/cphc.201700337] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 06/29/2017] [Indexed: 01/03/2023]
Abstract
In the RNA realm, non-Watson-Crick base pairs are abundant and can affect both the RNA 3D structure and its function. Here, we investigated the formation of RNA kissing complexes in which the loop-loop interaction is modulated by non-Watson-Crick pairs. Mass spectrometry, surface plasmon resonance, and UV-melting experiments show that the G⋅U wobble base pair favors kissing complex formation only when placed at specific positions. We tried to rationalize this effect by molecular modeling, including molecular mechanics Poisson-Boltzmann surface area (MMPBSA) thermodynamics calculations and PBSA calculations of the electrostatic potential surfaces. Modeling reveals that the G⋅U stabilization is due to a specific electrostatic environment defined by the base pairs of the entire loop-loop region. The loop is not symmetric, and therefore the identity and position of each base pair matters. Predicting and visualizing the electrostatic environment created by a given sequence can help to design specific kissing complexes with high affinity, for potential therapeutic, nanotechnology or analytical applications.
Collapse
Affiliation(s)
- Josephine Abi-Ghanem
- Univ. Bordeaux, INSERM, CNRS, Laboratoire Acides Nucléiques, Régulations Naturelle et Artificielle, ARNA, U1212, UMR5320, IECB, 2 rue Robert Escarpit, 33607, Pessac, France
| | - Clémence Rabin
- Univ. Bordeaux, INSERM, CNRS, Laboratoire Acides Nucléiques, Régulations Naturelle et Artificielle, ARNA, U1212, UMR5320, IECB, 2 rue Robert Escarpit, 33607, Pessac, France
| | - Massimiliano Porrini
- Univ. Bordeaux, INSERM, CNRS, Laboratoire Acides Nucléiques, Régulations Naturelle et Artificielle, ARNA, U1212, UMR5320, IECB, 2 rue Robert Escarpit, 33607, Pessac, France
| | - Eric Dausse
- Univ. Bordeaux, INSERM, CNRS, Laboratoire Acides Nucléiques, Régulations Naturelle et Artificielle, ARNA, U1212, UMR5320, 146 rue Léo Saignat, 33076, Bordeaux, France
| | - Jean-Jacques Toulmé
- Univ. Bordeaux, INSERM, CNRS, Laboratoire Acides Nucléiques, Régulations Naturelle et Artificielle, ARNA, U1212, UMR5320, 146 rue Léo Saignat, 33076, Bordeaux, France
| | - Valérie Gabelica
- Univ. Bordeaux, INSERM, CNRS, Laboratoire Acides Nucléiques, Régulations Naturelle et Artificielle, ARNA, U1212, UMR5320, IECB, 2 rue Robert Escarpit, 33607, Pessac, France
| |
Collapse
|
7
|
Takeuchi Y, Endo M, Suzuki Y, Hidaka K, Durand G, Dausse E, Toulmé JJ, Sugiyama H. Single-molecule observations of RNA-RNA kissing interactions in a DNA nanostructure. Biomater Sci 2017; 4:130-5. [PMID: 26438892 DOI: 10.1039/c5bm00274e] [Citation(s) in RCA: 22] [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: 01/02/2023]
Abstract
RNA molecules uniquely form a complex through specific hairpin loops, called a kissing complex. The kissing complex is widely investigated and used for the construction of RNA nanostructures. Molecular switches have also been created by combining a kissing loop and a ligand-binding aptamer to control the interactions of RNA molecules. In this study, we incorporated two kinds of RNA molecules into a DNA origami structure and used atomic force microscopy to observe their ligand-responsive interactions at the single-molecule level. We used a designed RNA aptamer called GTPswitch, which has a guanosine triphosphate (GTP) responsive domain and can bind to the target RNA hairpin named Aptakiss in the presence of GTP. We observed shape changes of the DNA/RNA strands in the DNA origami, which are induced by the GTPswitch, into two different shapes in the absence and presence of GTP, respectively. We also found that the switching function in the nanospace could be improved by using a cover strand over the kissing loop of the GTPswitch or by deleting one base from this kissing loop. These newly designed ligand-responsive aptamers can be used for the controlled assembly of the various DNA and RNA nanostructures.
Collapse
Affiliation(s)
- Yosuke Takeuchi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Masayuki Endo
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan.
| | - Yuki Suzuki
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kumi Hidaka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Guillaume Durand
- ARNA laboratory, University of Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France. and Inserm U869, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Eric Dausse
- ARNA laboratory, University of Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France. and Inserm U869, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Jean-Jacques Toulmé
- ARNA laboratory, University of Bordeaux, 146 rue Léo Saignat, 33076 Bordeaux, France. and Inserm U869, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Hiroshi Sugiyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan and Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida-ushinomiyacho, Sakyo-ku, Kyoto, 606-8501, Japan.
| |
Collapse
|
8
|
|
9
|
Durand G, Dausse E, Goux E, Fiore E, Peyrin E, Ravelet C, Toulmé JJ. A combinatorial approach to the repertoire of RNA kissing motifs; towards multiplex detection by switching hairpin aptamers. Nucleic Acids Res 2016; 44:4450-9. [PMID: 27067541 PMCID: PMC4872101 DOI: 10.1093/nar/gkw206] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 03/15/2016] [Indexed: 01/22/2023] Open
Abstract
Loop–loop (also known as kissing) interactions between RNA hairpins are involved in several mechanisms in both prokaryotes and eukaryotes such as the regulation of the plasmid copy number or the dimerization of retroviral genomes. The stability of kissing complexes relies on loop parameters (base composition, sequence and size) and base combination at the loop–loop helix - stem junctions. In order to identify kissing partners that could be used as regulatory elements or building blocks of RNA scaffolds, we analysed a pool of 5.2 × 106 RNA hairpins with randomized loops. We identified more than 50 pairs of kissing RNA hairpins. Two kissing motifs, 5′CCNY and 5′RYRY, generate highly stable complexes with KDs in the low nanomolar range. Such motifs were introduced in the apical loop of hairpin aptamers that switch between unfolded and folded state upon binding to their cognate target molecule, hence their name aptaswitch. The aptaswitch–ligand complex is specifically recognized by a second RNA hairpin named aptakiss through loop–loop interaction. Taking advantage of our kissing motif repertoire we engineered aptaswitch–aptakiss modules for purine derivatives, namely adenosine, GTP and theophylline and demonstrated that these molecules can be specifically and simultaneously detected by surface plasmon resonance or by fluorescence anisotropy.
Collapse
Affiliation(s)
- Guillaume Durand
- University of Bordeaux, ARNA Laboratory, 146 rue Léo Saignat, 33076 Bordeaux, France Inserm U1212, 146 rue Léo Saignat, 33076 Bordeaux, France CNRS UMR5320, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Eric Dausse
- University of Bordeaux, ARNA Laboratory, 146 rue Léo Saignat, 33076 Bordeaux, France Inserm U1212, 146 rue Léo Saignat, 33076 Bordeaux, France CNRS UMR5320, 146 rue Léo Saignat, 33076 Bordeaux, France
| | - Emma Goux
- University Grenoble Alpes, Département de Pharmacochimie Moléculaire, CNRS UMR5063, 38400 St Martin d'Hères, France
| | - Emmanuelle Fiore
- University Grenoble Alpes, Département de Pharmacochimie Moléculaire, CNRS UMR5063, 38400 St Martin d'Hères, France
| | - Eric Peyrin
- University Grenoble Alpes, Département de Pharmacochimie Moléculaire, CNRS UMR5063, 38400 St Martin d'Hères, France
| | - Corinne Ravelet
- University Grenoble Alpes, Département de Pharmacochimie Moléculaire, CNRS UMR5063, 38400 St Martin d'Hères, France
| | - Jean-Jacques Toulmé
- University of Bordeaux, ARNA Laboratory, 146 rue Léo Saignat, 33076 Bordeaux, France Inserm U1212, 146 rue Léo Saignat, 33076 Bordeaux, France CNRS UMR5320, 146 rue Léo Saignat, 33076 Bordeaux, France
| |
Collapse
|
10
|
Chovelon B, Durand G, Dausse E, Toulmé JJ, Faure P, Peyrin E, Ravelet C. ELAKCA: Enzyme-Linked Aptamer Kissing Complex Assay as a Small Molecule Sensing Platform. Anal Chem 2016; 88:2570-5. [PMID: 26832823 DOI: 10.1021/acs.analchem.5b04575] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report herein a novel sandwich-type enzyme-linked assay for the "signal-on" colorimetric detection of small molecules. The approach (referred to as enzyme-linked aptamer kissing complex assay (ELAKCA)) relied on the kissing complex-based recognition of the target-bound hairpin aptamer conformational state by a specific RNA hairpin probe. The aptamer was covalently immobilized on a microplate well surface to act as target capture element. Upon small analyte addition, the folded aptamer was able to bind to the biotinylated RNA hairpin module through loop-loop interaction. The formed ternary complex was then revealed by the introduction of the streptavidin-horseradish peroxidase conjugate that catalytically converted the 3,3',5,5'-tetramethylbenzidine substrate into a colorimetric product. ELAKCA was successfully designed for two different systems allowing detecting the adenosine and theophylline molecules. The potential practical applicability in terms of biological sample analysis (human plasma), temporal stability, and reusability was also reported. Owing to the variety of both hairpin functional nucleic acids, kissing motifs, and enzyme-based signaling systems, ELAKCA opens up new prospects for developing small molecule sensing platforms of wide applications.
Collapse
Affiliation(s)
- Benoit Chovelon
- University Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France.,Département de Biochimie, Toxicologie et Pharmacologie, CHU de Grenoble Site Nord - Institut de Biologie et de Pathologie , F-38041 Grenoble, France
| | - Guillaume Durand
- Laboratoire ARNA, Université Bordeaux, Inserm U869, F-33076 Bordeaux, France
| | - Eric Dausse
- Laboratoire ARNA, Université Bordeaux, Inserm U869, F-33076 Bordeaux, France
| | - Jean-Jacques Toulmé
- Laboratoire ARNA, Université Bordeaux, Inserm U869, F-33076 Bordeaux, France
| | - Patrice Faure
- Département de Biochimie, Toxicologie et Pharmacologie, CHU de Grenoble Site Nord - Institut de Biologie et de Pathologie , F-38041 Grenoble, France.,University Grenoble Alpes, Laboratory of Hypoxy Physiopathology Study Inserm U1042, 38700 La Tronche, France
| | - Eric Peyrin
- University Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France
| | - Corinne Ravelet
- University Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France
| |
Collapse
|
11
|
Dausse E, Barré A, Aimé A, Groppi A, Rico A, Ainali C, Salgado G, Palau W, Daguerre E, Nikolski M, Toulmé JJ, Di Primo C. Aptamer selection by direct microfluidic recovery and surface plasmon resonance evaluation. Biosens Bioelectron 2016; 80:418-425. [PMID: 26874109 DOI: 10.1016/j.bios.2016.02.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 01/19/2016] [Accepted: 02/02/2016] [Indexed: 01/02/2023]
Abstract
A surface plasmon resonance (SPR)-based SELEX approach has been used to raise RNA aptamers against a structured RNA, derived from XBP1 pre-mRNA, that folds as two contiguous hairpins. Thanks to the design of the internal microfluidic cartridge of the instrument, the selection was performed during the dissociation phase of the SPR analysis by recovering the aptamer candidates directly from the target immobilized onto the sensor chip surface. The evaluation of the pools was performed by SPR, simultaneously, during the association phase, each time the amplified and transcribed candidates were injected over the immobilized target. SPR coupled with SELEX from the first to the last round allowed identifying RNA aptamers that formed highly stable loop-loop complexes (KD equal to 8nM) with the hairpin located on the 5' side of the target. High throughput sequencing of two key rounds confirmed the evolution observed by SPR and also revealed the selection of hairpins displaying a loop not fully complementary to the loop of its target. These candidates were selected mainly because they bound 79 times faster to the target than those having a complementary loop. SELEX coupled with SPR is expected to speed up the selection process because selection and evaluation are performed simultaneously.
Collapse
Affiliation(s)
- Eric Dausse
- University of Bordeaux, Laboratoire ARNA, Bordeaux F-33000, France; INSERM U1212-CNRS UMR 5320, IECB, Pessac F-33600, France
| | - Aurélien Barré
- University of Bordeaux, CBiB-LaBRI, Bordeaux F-33000, France
| | - Ahissan Aimé
- University of Bordeaux, Laboratoire ARNA, Bordeaux F-33000, France; INSERM U1212-CNRS UMR 5320, IECB, Pessac F-33600, France
| | - Alexis Groppi
- University of Bordeaux, CBiB-LaBRI, Bordeaux F-33000, France
| | - Alain Rico
- Thermo Fisher Scientific, Saint Aubin F-91190, France
| | | | - Gilmar Salgado
- University of Bordeaux, Laboratoire ARNA, Bordeaux F-33000, France; INSERM U1212-CNRS UMR 5320, IECB, Pessac F-33600, France
| | - William Palau
- University of Bordeaux, Laboratoire ARNA, Bordeaux F-33000, France; INSERM U1212-CNRS UMR 5320, IECB, Pessac F-33600, France
| | | | - Macha Nikolski
- University of Bordeaux, CBiB-LaBRI, Bordeaux F-33000, France
| | - Jean-Jacques Toulmé
- University of Bordeaux, Laboratoire ARNA, Bordeaux F-33000, France; INSERM U1212-CNRS UMR 5320, IECB, Pessac F-33600, France
| | - Carmelo Di Primo
- University of Bordeaux, Laboratoire ARNA, Bordeaux F-33000, France; INSERM U1212-CNRS UMR 5320, IECB, Pessac F-33600, France.
| |
Collapse
|
12
|
Evadé L, Dausse E, Taouji S, Daguerre E, Chevet E, Toulmé JJ. Aptamer-mediated nanoparticle interactions: from oligonucleotide-protein complexes to SELEX screens. Methods Mol Biol 2016; 1297:153-67. [PMID: 25896002 DOI: 10.1007/978-1-4939-2562-9_11] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Aptamers are oligonucleotides displaying specific binding properties for a predetermined target. They can be easily immobilized on various surfaces such as nanoparticles. Functionalized particles can then be used to various aims. We took advantage of the AlphaScreen(®) technology for monitoring aptamer-mediated interactions. A particle bearing an aptamer contains a photosensitizer whereas another type of particle contains a chemiluminescer. Irradiation causes the formation of singlet oxygen species in the photosensitizer-containing bead that in turn activates the chemiluminescer. Luminescence emission can be observed if the two types of beads are in close proximity (<200 nm). This is achieved when the cognate ligand of the aptamer is grafted onto the chemiluminescer-containing bead. Using this technology we have screened oligonucleotide libraries and monitored aptamer-protein interactions. This constitutes the basis for aptamer-based analytical assays.
Collapse
Affiliation(s)
- Laetitia Evadé
- Novaptech, European Institute of Chemistry and Biology, Pessac, France
| | | | | | | | | | | |
Collapse
|
13
|
Durand G, Lisi S, Ravelet C, Dausse E, Peyrin E, Toulmé JJ. Riboswitches Based on Kissing Complexes for the Detection of Small Ligands. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400402] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
14
|
Durand G, Lisi S, Ravelet C, Dausse E, Peyrin E, Toulmé JJ. Riboswitches based on kissing complexes for the detection of small ligands. Angew Chem Int Ed Engl 2014; 53:6942-5. [PMID: 24916019 DOI: 10.1002/anie.201400402] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Indexed: 01/08/2023]
Abstract
Biosensors derived from aptamers were designed for which folding into a hairpin shape is triggered by binding of the cognate ligand. These aptamers (termed aptaswitches) thus switch between folded and unfolded states in the presence and absence of the ligand, respectively. The apical loop of the folded aptaswitch is recognized by a second hairpin called the aptakiss through loop-loop or kissing interactions, whereas the aptakiss does not bind the unfolded aptaswitch. Therefore, the formation of a kissing complex signals the presence of the ligand. Aptaswitches were designed that enable the detection of GTP and adenosine in a specific and quantitative manner by surface plasmon resonance when using a grafted aptakiss or in solution by anisotropy measurement with a fluorescently labeled aptakiss. This approach is generic and can potentially be extended to the detection of any molecule for which hairpin aptamers have been identified, as long as the apical loop is not involved in ligand binding.
Collapse
Affiliation(s)
- Guillaume Durand
- Univ. Bordeaux, IECB, Laboratoire ARNA, 2 rue Robert Escarpit, 33607 Pessac (France); Inserm U869, Laboratoire ARNA, 146 rue Léo Saignat, 33076 Bordeaux (France)
| | | | | | | | | | | |
Collapse
|
15
|
Da Rocha Gomes S, Miguel J, Azéma L, Eimer S, Ries C, Dausse E, Loiseau H, Allard M, Toulmé JJ. (99m)Tc-MAG3-aptamer for imaging human tumors associated with high level of matrix metalloprotease-9. Bioconjug Chem 2012; 23:2192-200. [PMID: 23043415 DOI: 10.1021/bc300146c] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The human matrix metalloprotease 9 (hMMP-9) is involved in many physiological processes such as tissue remodeling. Its overexpression in tumors promotes the release of cancer cells thus contributing to tumor metastasis. It is a relevant marker of malignant tumors. We selected an RNA aptamer containing 2'-fluoro, pyrimidine ribonucleosides, that exhibits a strong affinity for hMMP-9 (K(d) = 20 nM) and that discriminates other human MMPs: no binding was detected to either hMMP-2 or -7. Investigating the binding properties of different MMP-9 aptamer variants by surface plasmon resonance allowed the determination of recognition elements. As a result, a truncated aptamer, 36 nucleotides long, was made fully resistant to nuclease following the substitution of every purine ribonucleoside residue by 2'-O-methyl analogues and was conjugated to S-acetylmercaptoacetyltriglycine for imaging purposes. The resulting modified aptamer retained the binding properties of the originally selected sequence. Following (99m)Tc labeling, this aptamer was used for ex vivo imaging slices of human brain tumors. We were able to specifically detect the presence of hMMP-9 in such tissues.
Collapse
Affiliation(s)
- Sonia Da Rocha Gomes
- INSERM U869, ARNA, Institut Européen de Chimie et Biologie, 33607 Pessac, France
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Löscher M, Schosserer M, Dausse E, Lee K, Ajuh P, Grillari-Voglauer R, Lamond AI, Toulmé JJ, Grillari J. Inhibition of pre-mRNA splicing by a synthetic Blom7α-interacting small RNA. PLoS One 2012; 7:e47497. [PMID: 23144703 PMCID: PMC3483155 DOI: 10.1371/journal.pone.0047497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 09/17/2012] [Indexed: 12/02/2022] Open
Abstract
Originally the novel protein Blom7α was identified as novel pre-mRNA splicing factor that interacts with SNEVPrp19/Pso4, an essential protein involved in extension of human endothelial cell life span, DNA damage repair, the ubiquitin-proteasome system, and pre-mRNA splicing. Blom7α belongs to the heteronuclear ribonucleoprotein K homology (KH) protein family, displaying 2 KH domains, a well conserved and widespread RNA-binding motif. In order to identify specific sequence binding motifs, we here used Systematic Evolution of Ligands by Exponential Enrichment (SELEX) with a synthetic RNA library. Besides sequence motifs like (U/A)1–4 C2–6 (U/A)1–5, we identified an AC-rich RNA-aptamer that we termed AK48 (Aptamer KH-binding 48), binding to Blom7α with high affinity. Addition of AK48 to pre-mRNA splicing reactions in vitro inhibited the formation of mature spliced mRNA and led to a slight accumulation of the H complex of the spliceosome. These results suggest that the RNA binding activity of Blom7α might be required for pre-mRNA splicing catalysis. The inhibition of in-vitro splicing by the small RNA AK48 indicates the potential use of small RNA molecules in targeting the spliceosome complex as a novel target for drug development.
Collapse
Affiliation(s)
- Marlies Löscher
- Department of Biotechnology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Markus Schosserer
- Department of Biotechnology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Eric Dausse
- INSERM U869, European Institute of Chemistry and Biology, Pessac, France
- University of Bordeaux, Bordeaux, France
| | - Kiseok Lee
- Department of Biotechnology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
| | - Paul Ajuh
- School of Life Sciences, Welcome Trust Biocentre, University of Dundee, Dundee, United Kingdom
| | - Regina Grillari-Voglauer
- Department of Biotechnology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
- ACIB, Vienna, Austria
- Evercyte GmbH, Vienna, Austria
| | - Angus I. Lamond
- School of Life Sciences, Welcome Trust Biocentre, University of Dundee, Dundee, United Kingdom
| | - Jean-Jacques Toulmé
- INSERM U869, European Institute of Chemistry and Biology, Pessac, France
- University of Bordeaux, Bordeaux, France
| | - Johannes Grillari
- Department of Biotechnology, BOKU - University of Natural Resources and Life Sciences, Vienna, Austria
- Evercyte GmbH, Vienna, Austria
- * E-mail:
| |
Collapse
|
17
|
Toulmé JJ, Giegé R. Les aptamères : des ligands et des catalyseurs oligonucléotidiques obtenus par sélection in vitro. ACTA ACUST UNITED AC 2012. [DOI: 10.4267/10608/1003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
18
|
Crozals GD, Farre C, Hantier G, Léonard D, Marquette CA, Mandon CA, Marmuse L, Louis C, Toulmé JJ, Billotey C, Janier M, Chaix C. Oligonucleotide solid-phase synthesis on fluorescent nanoparticles grafted on controlled pore glass. RSC Adv 2012. [DOI: 10.1039/c2ra22077f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
|
19
|
Delaurière L, Dong Z, Laxmi-Reddy K, Godde F, Toulmé JJ, Huc I. Deciphering Aromatic Oligoamide Foldamer-DNA Interactions. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201106208] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
20
|
Delaurière L, Dong Z, Laxmi-Reddy K, Godde F, Toulmé JJ, Huc I. Deciphering aromatic oligoamide foldamer-DNA interactions. Angew Chem Int Ed Engl 2011; 51:473-7. [PMID: 22135220 DOI: 10.1002/anie.201106208] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 10/28/2011] [Indexed: 01/16/2023]
Abstract
Finest selection: Side-chain selective, end-group selective, diastereoselective, and RNA- vs. DNA-selective interactions have been revealed between multiturn helical aromatic amide foldamers having cationic side chains and G-quadruplex aptamers.
Collapse
Affiliation(s)
- Laurence Delaurière
- Univ. Bordeaux, IECB, laboratoire ARNA, 2 rue Robert Escarpit, 33607 Pessac, France
| | | | | | | | | | | |
Collapse
|
21
|
Renaud de la Faverie A, Hamon F, Di Primo C, Largy E, Dausse E, Delaurière L, Landras-Guetta C, Toulmé JJ, Teulade-Fichou MP, Mergny JL. Nucleic acids targeted to drugs: SELEX against a quadruplex ligand. Biochimie 2011; 93:1357-67. [DOI: 10.1016/j.biochi.2011.05.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Accepted: 05/24/2011] [Indexed: 01/01/2023]
|
22
|
Dausse E, Taouji S, Evadé L, Di Primo C, Chevet E, Toulmé JJ. HAPIscreen, a method for high-throughput aptamer identification. J Nanobiotechnology 2011; 9:25. [PMID: 21639912 PMCID: PMC3127992 DOI: 10.1186/1477-3155-9-25] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [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: 01/05/2011] [Accepted: 06/03/2011] [Indexed: 01/24/2023] Open
Abstract
Background Aptamers are oligonucleotides displaying specific binding properties for a predetermined target. They are selected from libraries of randomly synthesized candidates through an in vitro selection process termed SELEX (Systematic Evolution of Ligands by EXponential enrichment) alternating selection and amplification steps. SELEX is followed by cloning and sequencing of the enriched pool of oligonucleotides to enable comparison of the selected sequences. The most represented candidates are then synthesized and their binding properties are individually evaluated thus leading to the identification of aptamers. These post-selection steps are time consuming and introduce a bias to the expense of poorly amplified binders that might be of high affinity and are consequently underrepresented. A method that would circumvent these limitations would be highly valuable. Results We describe a novel homogeneous solution-based method for screening large populations of oligonucleotide candidates generated from SELEX. This approach, based on the AlphaScreen® technology, is carried out on the exclusive basis of the binding properties of the selected candidates without the needs of performing a priori sequencing. It therefore enables the functional identification of high affinity aptamers. We validated the HAPIscreen (High throughput APtamer Identification screen) methodology using aptamers targeted to RNA hairpins, previously identified in our laboratory. We then screened pools of candidates issued from SELEX rounds in a 384 well microplate format and identify new RNA aptamers to pre-microRNAs. Conclusions HAPIscreen, an Alphascreen®-based methodology for the identification of aptamers is faster and less biased than current procedures based on sequence comparison of selected oligonucleotides and sampling binding properties of few individuals. Moreover this methodology allows for screening larger number of candidates. Used here for selecting anti-premiR aptamers, HAPIscreen can be adapted to any type of tagged target and is fully amenable to automation.
Collapse
Affiliation(s)
- Eric Dausse
- Inserm U869, Institut Européen de Chimie et Biologie, 2 rue Robert Escarpit, 33706 Pessac, France
| | | | | | | | | | | |
Collapse
|
23
|
Shukla GC, Haque F, Tor Y, Wilhelmsson LM, Toulmé JJ, Isambert H, Guo P, Rossi JJ, Tenenbaum SA, Shapiro BA. A boost for the emerging field of RNA nanotechnology. ACS Nano 2011; 5:3405-18. [PMID: 21604810 PMCID: PMC3102291 DOI: 10.1021/nn200989r] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
This Nano Focus article highlights recent advances in RNA nanotechnology as presented at the First International Conference of RNA Nanotechnology and Therapeutics, which took place in Cleveland, OH, USA (October 23-25, 2010) ( http://www.eng.uc.edu/nanomedicine/RNA2010/ ), chaired by Peixuan Guo and co-chaired by David Rueda and Scott Tenenbaum. The conference was the first of its kind to bring together more than 30 invited speakers in the frontier of RNA nanotechnology from France, Sweden, South Korea, China, and throughout the United States to discuss RNA nanotechnology and its applications. It provided a platform for researchers from academia, government, and the pharmaceutical industry to share existing knowledge, vision, technology, and challenges in the field and promoted collaborations among researchers interested in advancing this emerging scientific discipline. The meeting covered a range of topics, including biophysical and single-molecule approaches for characterization of RNA nanostructures; structure studies on RNA nanoparticles by chemical or biochemical approaches, computation, prediction, and modeling of RNA nanoparticle structures; methods for the assembly of RNA nanoparticles; chemistry for RNA synthesis, conjugation, and labeling; and application of RNA nanoparticles in therapeutics. A special invited talk on the well-established principles of DNA nanotechnology was arranged to provide models for RNA nanotechnology. An Administrator from National Institutes of Health (NIH) National Cancer Institute (NCI) Alliance for Nanotechnology in Cancer discussed the current nanocancer research directions and future funding opportunities at NCI. As indicated by the feedback received from the invited speakers and the meeting participants, this meeting was extremely successful, exciting, and informative, covering many groundbreaking findings, pioneering ideas, and novel discoveries.
Collapse
Affiliation(s)
- Girish C. Shukla
- Center for Gene Regulation in Health and Disease, Department of Biological Sciences, Cleveland State University, Cleveland, Ohio 44115, United States
| | - Farzin Haque
- Nanobiomedical Center, College of Engineering and Applied Science, and College of Medicine, University of Cincinnati, Cincinnati, Ohio 45267, United States
| | - Yitzhak Tor
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - L. Marcus Wilhelmsson
- Department of Chemical and Biological Engineering/Physical Chemistry, Chalmers University of Technology, Kemivägen 10, SE-412 96 Göteborg, Sweden
| | - Jean-Jacques Toulmé
- Université Bordeaux Segalen, INSERM U869, Bâtiment 3A 1er étage, 33076 Bordeaux Cedex, France
| | - Hervé Isambert
- Institut Curie, Research Division, CNRS UMR 168, 11 rue P. & M. Curie, 75005 Paris, France
| | - Peixuan Guo
- Nanobiomedical Center, College of Engineering and Applied Science, and College of Medicine, University of Cincinnati, Cincinnati, Ohio 45267, United States
| | - John J. Rossi
- Department of Molecular and Cellular Biology, Beckman Research Institute of City of Hope, Duarte, California 91010, United States
| | - Scott A. Tenenbaum
- College of Nanoscale Science & Engineering, University at Albany-SUNY, Albany, New York 12203, United States
| | - Bruce A. Shapiro
- Center for Cancer Research Nanobiology Program, National Cancer Institute at Frederick, Frederick, Maryland 21702, United States
| |
Collapse
|
24
|
Abstract
Instruments based on the surface plasmon resonance (SPR) principle allow label-free detection of interactions between targets immobilized at a solid-liquid interface and partners in solution. This method is well suited to determine the kinetic parameters, the equilibrium constant and the stoichiometry of a reaction. Aptamers are ligands identified from random libraries of RNA, DNA or chemically modified oligonucleotides by in vitro selection (SELEX). Aptamers can be raised against a great variety of targets (small molecules, proteins, nucleic acids, cells, viruses, bacteria). SPR is routinely used in our laboratory for the analysis of RNA aptamer-RNA target complexes. To illustrate SPR investigation of such complexes, we describe here methods that were successfully used to monitor the interaction between the trans-activating responsive element of HIV-1 and an RNA aptamer.
Collapse
Affiliation(s)
- Carmelo Di Primo
- ARNA laboratory, University of Bordeaux, F-33000 Bordeaux, France.
| | | | | |
Collapse
|
25
|
Abstract
Loop-loop interactions mediate the recognition between RNA hairpins leading to the formation of so-called kissing complexes. Both the size and the sequence of the loop are critical for ensuring stable interaction. Using in vitro selection we have characterized a few loop sequences that lead to the formation of highly stable kissing complexes. These sequences constitute targets of interest for the rational design of RNA stem loop ligands. Such an appropriate target sequence was identified in a sub-domain of the Internal Ribosomal Entry Site (IRES) of the Hepatitis C Virus (HCV) mRNA. We synthesized chemically-modified RNA hairpins and demonstrated that they specifically reduced the expression of a HCV IRES driven reporter gene in cultured cells.
Collapse
Affiliation(s)
- Eric Dausse
- Inserm U869, Institut Européen de Chimie et Biologie, Pessac, France
| | | | | | | |
Collapse
|
26
|
|
27
|
Dausse E, Da Rocha Gomes S, Toulmé JJ. Aptamers: a new class of oligonucleotides in the drug discovery pipeline? Curr Opin Pharmacol 2009; 9:602-7. [PMID: 19717337 DOI: 10.1016/j.coph.2009.07.006] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Accepted: 07/16/2009] [Indexed: 11/30/2022]
Abstract
Aptamers are oligonucleotides identified in a randomly synthesized library containing up to 10(15) different molecules that fold into defined three-dimensional structures. Following their selection for predetermined properties at the end of an iterative process known as SELEX (Systematic Evolution of Ligands by Exponential enrichment) they can be chemically modified in order to provide them with additional properties. These molecules display both high affinity and specificity for their target. Aptamers constitute promising molecules for therapeutic applications as exemplified by pegaptanib, an aptamer-derived anti-VEGF compound shown to be effective in treating age-related macular degeneration.
Collapse
Affiliation(s)
- Eric Dausse
- Inserm U869, 33076 Bordeaux, France; IECB, University of Bordeaux, France
| | | | | |
Collapse
|
28
|
Watrin M, Von Pelchrzim F, Dausse E, Schroeder R, Toulmé JJ. In vitro selection of RNA aptamers derived from a genomic human library against the TAR RNA element of HIV-1. Biochemistry 2009; 48:6278-84. [PMID: 19496624 DOI: 10.1021/bi802373d] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The transactivating responsive (TAR) element is a RNA hairpin located in the 5' untranslated region of HIV-1 mRNA. It is essential for full-length transcription of the retroviral genome and therefore for HIV-1 replication. Hairpin aptamers that generate highly stable and specific complexes with TAR were previously identified, thus decreasing the level of TAR-dependent expression in cultured cells [Kolb, G., et al. (2006) RNA Biol. 3, 150-156]. We performed genomic SELEX against TAR using a human RNA library to identify human transcripts that might interact with the retroviral genome through loop-loop interactions and potentially contribute to the regulation of TAR-mediated processes. We identified a genomic aptamer termed a1 that folds as a hairpin with an apical loop complementary to five nucleotides of the TAR hexanucleotide loop. Surface plasmon resonance experiments performed on a truncated or mutated version of the a1 aptamer, in the presence of the Rop protein of Escherichia coli, indicate the formation of a highly stable a1-TAR kissing complex. The 5' ACCCAG loop of a1 constitutes a new motif of interaction with the TAR loop.
Collapse
Affiliation(s)
- Marguerite Watrin
- Inserm U869, European Institute of Chemistry and Biology, Pessac, France
| | | | | | | | | |
Collapse
|
29
|
Abstract
Oligonucleotides complementary to RNA sequences interact poorly with folded target regions. In vitro selection of oligonucleotides carried out against RNA structures have led to aptamers that frequently differ from antisense sequences, but rather take advantage of non-double-stranded peculiarities of the target. Studies along this line provide information about tertiary RNA architectures as well as their interaction with ligand of interest. We describe here a genomic SELEX approach and its application to the recognition of stem-loop structures prone to the formation of kissing complexes. We also provide technical details for running a procedure termed 2D-SELEX that takes advantage of both in vitro selection and dynamic combinatorial chemistry. This allows selecting aptamer derivatives containing modified nucleotides that cannot be incorporated by polymerases. Last we present in vitro transcription conditions under which large amounts of RNA, suitable for NMR structural studies, can be obtained. These different aspects of the SELEX technology have been applied to the trans-activating responsive element of the human immunodeficiency virus type 1, which is crucial for the transcription of the retroviral genome.
Collapse
Affiliation(s)
- Marguerite Watrin
- Institut Européen de Chimie et Biologie, Pessac, France, Université Victor Segalen, Bordeaux, France
| | | | | | | | | | | |
Collapse
|
30
|
Jaffrelo L, Chabas S, Reigadas S, Pflieger A, Wychowski C, Rumi J, Ventura M, Toulmé JJ, Staedel C. A functional selection of viral genetic elements in cultured cells to identify hepatitis C virus RNA translation inhibitors. Nucleic Acids Res 2008; 36:e95. [PMID: 18614605 PMCID: PMC2528164 DOI: 10.1093/nar/gkn427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
We developed a functional selection system based on randomized genetic elements (GE) to identify potential regulators of hepatitis C virus (HCV) RNA translation, a process initiated by an internal ribosomal entry site (IRES). A retroviral HCV GE library was introduced into HepG2 cells, stably expressing the Herpes simplex virus thymidine kinase (HSV-TK) under the control of the HCV IRES. Cells that expressed transduced GEs inhibiting HSV-TK were selected via their resistance to ganciclovir. Six major GEs were rescued by PCR on the selected cell DNA and identified as HCV elements. We validated our strategy by further studying the activity of one of them, GE4, encoding the 5′ end of the viral NS5A gene. GE4 inhibited HCV IRES-, but not cap-dependent, reporter translation in human hepatic cell lines and inhibited HCV infection at a post-entry step, decreasing by 85% the number of viral RNA copies. This method can be applied to the identification of gene expression regulators.
Collapse
|
31
|
Ivanova G, Arzumanov A, Gait MJ, Reigadas S, Toulmé JJ, Andreola ML, Ittig D, Leumann C. Comparative studies of tricyclo-DNA- and LNA-containing oligonucleotides as inhibitors of HIV-1 gene expression. Nucleosides Nucleotides Nucleic Acids 2008; 26:747-50. [PMID: 18066894 DOI: 10.1080/15257770701490928] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Trans-activation of HIV-1 transcription is triggered by the interaction of the protein Tat and host cellular factors with a 59-residue stem-loop RNA known as the trans-activation responsive element (TAR). Here we compare the trans-activation steric block inhibitory activity of 16-mer oligonucleotides targeted to TAR containing tricyclo-DNAs, and their mixmers with LNA or OMe residues, with LNA/OMe oligonucleotide. Despite generally weaker TAR RNA binding affinity, all tricyclo-DNA oligonucleotides showed similarly good activity levels to OMe/LNA oligonucleotide in a HeLa Tat-dependent trans-activation cell reporter assay with cationic lipid delivery, but mixmers of tricyclo-DNA were inactive. Tricyclo-DNA 16-mer showed sequence-specific inhibition of beta-galactosidase expression in an anti-HIV HeLa cell reporter assay.
Collapse
Affiliation(s)
- Gabriela Ivanova
- Laboratory of Molecular Biology, Medical Research Council, Cambridge, UK
| | | | | | | | | | | | | | | |
Collapse
|
32
|
Lebars I, Richard T, Di Primo C, Toulmé JJ. NMR structure of a kissing complex formed between the TAR RNA element of HIV-1 and a LNA-modified aptamer. Nucleic Acids Res 2007; 35:6103-14. [PMID: 17768146 PMCID: PMC2094059 DOI: 10.1093/nar/gkm655] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The trans-activating responsive (TAR) RNA element located in the 5′ untranslated region of the HIV-1 genome is a 57-nt imperfect stem-loop essential for the viral replication. TAR regulates transcription by interacting with both viral and cellular proteins. RNA hairpin aptamers specific for TAR were previously identified by in vitro selection [Ducongé,F. and Toulmé,J.J. (1999) In vitro selection identifies key determinants for loop-loop interactions: RNA aptamers selective for the TAR RNA element of HIV-1. RNA, 5, 1605–1614]. These aptamers display a 5′-GUCCCAGA-3′ consensus apical loop, partially complementary to the TAR one, leading to the formation of a TAR–aptamer kissing complex. The conserved GA combination (underlined in the consensus sequence) has been shown to be crucial for the formation of a highly stable complex. To improve the nuclease resistance of the aptamer and to increase its affinity for TAR, locked nucleic acid (LNA) nucleotides were introduced in the aptamer apical loop. LNA are nucleic acids analogues that contain a 2′-O,4′-C methylene linkage and that raise the thermostablity of duplexes. We solved the NMR solution structure of the TAR–LNA-modified aptamer kissing complex. Structural analysis revealed the formation of a non-canonical G•A pair leading to increased stacking at the stem-loop junction. Our data also showed that the introduction of LNA residues provides an enhanced stability while maintaining a normal Watson–Crick base pairing with a loop–loop conformation close to an A-type.
Collapse
Affiliation(s)
- Isabelle Lebars
- CNRS-Université Bordeaux 1-ENITAB, UMR 5248 CBMN, Institut Européen de Chimie et Biologie, Pessac, F-33607, France.
| | | | | | | |
Collapse
|
33
|
Ivanova G, Reigadas S, Ittig D, Arzumanov A, Andreola ML, Leumann C, Toulmé JJ, Gait MJ. Tricyclo-DNA containing oligonucleotides as steric block inhibitors of human immunodeficiency virus type 1 tat-dependent trans-activation and HIV-1 infectivity. Oligonucleotides 2007; 17:54-65. [PMID: 17461763 DOI: 10.1089/oli.2006.0046] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [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] [Indexed: 11/12/2022]
Abstract
Replication of human immunodeficiency virus type 1 (HIV-1) is controlled by a variety of viral and host proteins. The viral protein Tat acts in concert with host cellular factors to stimulate transcriptional elongation from the viral long terminal repeat (LTR) through a specific interaction with a 59-residue stem-loop RNA known as the trans-activation responsive element (TAR). Inhibitors of Tat-TAR recognition are expected to block transcription and suppress HIV-1 replication. In previous studies, we showed that 2'-O-methyl (OMe) oligonucleotide mixmers containing locked nucleic acid (LNA) residues are powerful steric block inhibitors of Tat-dependent trans-activation in a HeLa cell reporter system. Here we compare OMe/LNA mixmer oligonucleotides with oligonucleotides containing tricyclo-DNAs and their mixmers with OMe residues in four different assays: (1) binding to the target TAR RNA, (2) Tat-dependent in vitro transcription from an HIV-1 DNA template directed by HeLa cell nuclear extract, (3) trans-activation inhibition in HeLa cells containing a stably integrated firefly luciferase reporter gene under HIV-1 LTR control, and (4) an anti-HIV beta-galactosidase reporter assay of viral infection. Although tricyclo-DNA oligonucleotides bound TAR RNA more weakly, they were as good as OMe/LNA oligonucleotides in suppressing in vitro transcription and trans-activation in HeLa cells when delivered by cationic lipid. No inhibition of in vitro transcription and trans-activation in HeLa cells was observed for tricyclo-DNA/OMe mixmers, even though their affinities to TAR RNA were strong and their cell distributions did not differ from oligonucleotides containing all or predominantly tricyclo-DNA residues. Tricyclo-DNA 16-mer showed sequence-specific inhibition of beta-galactosidase expression in an anti-HIV HeLa cell reporter assay.
Collapse
Affiliation(s)
- Gabriela Ivanova
- Medical Research Council, Laboratory of Molecular Biology, Cambridge CB2 2QH, UK
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Abstract
SELEX (for Systematic Evolution of Ligands by Exponential enrichment) has proven to be extraordinarily powerful for the isolation of DNA or RNA aptamers that bind with high affinity and specificity to a wide range of molecular targets. However, the modest chemical functionality of nucleic acids poses some limits on the versatility of aptamers as binders and catalysts. To further improve the properties of aptamers, additional chemical diversity must be introduced. The design of chemical modifications is not a trivial task. Recently, dynamic combinatorial chemistry (DCC) has been introduced as an alternative to traditional combinatorial chemistry. DCC employs equilibrium shifting to effect molecular evolution of a dynamic combinatorial library of molecules. Herein, we describe an original process that combines DCC and SELEX for the in vitro selection of modified aptamers which are conjugated to chemically diverse small-molecules. Its successful application for the selection of small-molecule conjugated RNA aptamers that bind tightly to the transactivation-response (TAR) element of HIV-1 is presented.
Collapse
Affiliation(s)
- Anthony Bugaut
- INSERM U386, 146 rue Leo Saignat, 33076 BORDEAUX Cedex, France.
| | | | | |
Collapse
|
35
|
Abstract
The unabated increase in spread of HIV infection worldwide has redoubled efforts to discover novel antiviral and virucidal agents that might be starting points for clinical development. Oligonucleotides and their analogs targeted to form complementary duplexes with highly conserved regions of the HIV RNA have shown significant antiviral activity, but to date clinical studies have been dominated by RNase H-inducing oligonucleotide analog phosphorothioates (GEM 91 and 92) that have specificity and efficacy limitations. However, they have proven the principle that oligonucleotides can be safe anti-HIV drugs. Newer oligonucleotide analogs are now available, which act as strong steric block agents of HIV RNA function. We describe our ongoing studies targeting the HIV-1 trans-activation responsive region (TAR) and the viral packaging signal (psi) with steric block oligonucleotides of varying chemistry and demonstrate their great potential for steric blocking of viral protein interactions in vitro and in cells and describe the first antiviral studies. Peptide nucleic acids (PNA) disulfide linked to cell-penetrating peptides (CPP) have been found to have particular promise for the lipid-free direct delivery into cultured cells and are excellent candidates for their development as antiviral and virucidal agents.
Collapse
Affiliation(s)
- Gabriela Ivanova
- Medical Research Council, Laboratory of Molecular Biology, Cambridge CB2 2QH, UK
| | | | | | | | | | | | | | | |
Collapse
|
36
|
Lebars I, Richard T, Di Primo C, Toulmé JJ. LNA derivatives of a kissing aptamer targeted to the trans-activating responsive RNA element of HIV-1. Blood Cells Mol Dis 2007; 38:204-9. [PMID: 17300966 DOI: 10.1016/j.bcmd.2006.11.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [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: 11/02/2006] [Accepted: 11/28/2006] [Indexed: 11/24/2022]
Abstract
We previously identified an RNA aptamer targeted to the trans-activating responsive (TAR) element of the HIV-1 genome [F. Ducongé, J.J. Toulmé, In vitro selection identifies key determinants for loop--loop interactions: RNA aptamers selective for the TAR RNA element of HIV--1. RNA 5 (1999) 1605--1614]. This hairpin aptamer binds to its target through loop-loop interactions. We derived chemically modified R06 aptamers that show improved nuclease resistance and affinity for TAR. We review here the results obtained with chimeric aptamers containing locked nucleic acid (LNA) residues. Chimeras containing 2 to 4 LNA residues in an RNA or 2'-O-methyl,RNA context display binding properties of interest and compete with the viral protein Tat for binding to TAR. NMR studies have shown that these properties are modulated by the conformation of the loop-loop helix depending on the presence of LNA residues.
Collapse
Affiliation(s)
- Isabelle Lebars
- UMR CNRS 5144, Institut Européen de Chimie et Biologie, Pessac, France
| | | | | | | |
Collapse
|
37
|
Di Primo C, Rudloff I, Reigadas S, Arzumanov AA, Gait MJ, Toulmé JJ. Systematic screening of LNA/2'-O-methyl chimeric derivatives of a TAR RNA aptamer. FEBS Lett 2007; 581:771-4. [PMID: 17276430 DOI: 10.1016/j.febslet.2007.01.047] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [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: 01/11/2007] [Accepted: 01/22/2007] [Indexed: 11/23/2022]
Abstract
We synthesized and evaluated by surface plasmon resonance 64 LNA/2'-O-methyl sequences corresponding to all possible combinations of such residues in a kissing aptamer loop complementary to the 6-nt loop of the TAR element of HIV-1. Three combinations of LNA/2'-O-methyl nucleoside analogues where one or two LNA units are located on the 3' side of the aptamer loop display an affinity for TAR below 1nM, i.e. one order of magnitude higher than the parent RNA aptamer. One of these combinations inhibits the TAR-dependent luciferase expression in a cell assay.
Collapse
Affiliation(s)
- Carmelo Di Primo
- INSERM U869, Institut Européen de Chimie et Biologie, 2 rue Escarpit, Pessac cedex, F-33607, France.
| | | | | | | | | | | |
Collapse
|
38
|
Darfeuille F, Reigadas S, Hansen JB, Orum H, Di Primo C, Toulmé JJ. Aptamers targeted to an RNA hairpin show improved specificity compared to that of complementary oligonucleotides. Biochemistry 2006; 45:12076-82. [PMID: 17002307 DOI: 10.1021/bi0606344] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [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: 11/28/2022]
Abstract
Aptamers interacting with RNA hairpins through loop-loop (so-called kissing) interactions have been described as an alternative to antisense oligomers for the recognition of RNA hairpins. R06, an RNA aptamer, was previously shown to form a kissing complex with the TAR (trans-activating responsive) hairpin of HIV-1 RNA (Ducongé and Toulmé (1999) RNA 5, 1605). We derived a chimeric locked nucleic acid (LNA)/DNA aptamer from R06 that retains the binding properties of the originally selected R06 aptamer. We demonstrated that this LNA/DNA aptamer competes with a peptide of the retroviral protein Tat for binding to TAR, even though the binding sites of the two ligands do not overlap each other. This suggests that upon binding, the aptamer TAR adopts a conformation that is no longer appropriate for Tat association. In contrast, a LNA/DNA antisense oligomer, which exhibits the same binding constant and displays the same base-pairing potential as the chimeric aptamer, does not compete with Tat. Moreover, we showed that the LNA/DNA aptamer is a more specific TAR binder than the LNA/DNA antisense sequence. These results demonstrate the benefit of reading the three-dimensional shape of an RNA target rather than its primary sequence for the design of highly specific oligonucleotides.
Collapse
|
39
|
Kolb G, Reigadas S, Castanotto D, Faure A, Ventura M, Rossi JJ, Toulmé JJ. Endogenous expression of an anti-TAR aptamer reduces HIV-1 replication. RNA Biol 2006; 3:150-6. [PMID: 17299271 DOI: 10.4161/rna.3.4.3811] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [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: 11/19/2022] Open
Abstract
An anti-TAR RNA aptamer called R06, which binds tightly and specifically to the trans-activation responsive (TAR) element of the human immunodeficiency virus type 1 (HIV-1) through loop-loop interactions has been previously selected.(1) We used HIV-based retroviral vectors to express the R06 aptamer. Its synthesis was driven by the U16 snoRNA. We investigated the ability of this cassette to interfere with TAR-mediated transcription using HeLa P4 cells stably expressing the beta-galactosidase gene under the control of the HIV-1 5'LTR. We demonstrated that, upon HIV-1 infection, the beta-galactosidase activity was reduced in cells expressing the nucleolar U16-R06 transcript. The replication of HIV-1 in these cells was also reduced as shown by quantification of the HIV-1 protease gene 24 h post-infection. This effect was specific and related to the formation of R06 TAR complex as an aptamer with a mutated loop, which was no longer able to bind to TAR, did not show any effect. The nucleolus is likely a compartment of interest for targeting the TAR-protein complex responsible for the trans-activation of transcription of the HIV-1 genome.
Collapse
Affiliation(s)
- Gaëlle Kolb
- INSERM U 869, Institut Européen de Chimie et Biologie, Pessac, France
| | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
Multiple loop-loop interactions between adjacent RNA hairpins regulate gene expression in different organisms. To demonstrate that such natural interactions could be mimicked for generating RNA ligands that are able to recognize simultaneously at least two structured RNA targets, a double kissing complex model was designed. The target consisted of two HIV-1 transactivating responsive (TAR) RNA variants, BRU and MAL, connected by a non-nucleotidic linker. The double ligand was generated by combining the corresponding hairpin aptamers, R06BRU and R06MAL, identified previously by in vitro selection [Ducongé, F., and Toulmé, J. J (1999) RNA 5, 1605-1614]. The resulting interaction was analyzed by thermal denaturation monitored by UV spectroscopy, electrophoretic mobility shift assays (EMSAs), and surface plasmon resonance (SPR) experiments. The bimodal complex was characterized by a binding equilibrium constant increased by at least 1 order of magnitude compared to that of the complexes between the individual parent hairpins. This resulted from a slower dissociation rate. We then made use of such a strategy for targeting two structured functional motifs of the folded 5' untranslated region (5'UTR) of HIV-1. Two bivalent RNA ligands were designed that targeted simultaneously the TAR and dimerization initiation site (DIS) hairpins or the TAR and poly(A) ones. The results show that these ligands also displayed enhanced affinity for their target compared to the individual molecules. The work reported here suggests that bimodal structured RNA ligands might provide a way of increasing the affinity of aptamers for folded RNA targets.
Collapse
Affiliation(s)
- David Boucard
- Université Victor Segalen, Bordeaux, F-33076, France, INSERM U386, Bordeaux, F-33076, France, and Institut Européen de Chimie et Biologie, Pessac, F-33607, France
| | | | | |
Collapse
|
41
|
Kolb G, Reigadas S, Boiziau C, van Aerschot A, Arzumanov A, Gait MJ, Herdewijn P, Toulmé JJ. Hexitol nucleic acid-containing aptamers are efficient ligands of HIV-1 TAR RNA. Biochemistry 2005; 44:2926-33. [PMID: 15723535 DOI: 10.1021/bi048393s] [Citation(s) in RCA: 27] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The transactivation responsive element (TAR) plays a crucial role in the transcription of the HIV-1 genome upon specific binding of the viral protein Tat and cellular proteins. We have previously identified a RNA hairpin aptamer forming a stable and specific kissing complex with TAR RNA (Ducongé, F., and Toulmé, J. J. (1999) RNA 5, 1605-1614). We chemically modified this aptamer with hexitol nucleic acid (HNA) residues. We demonstrate that a fully HNA-modified aptamer is a poor ligand but, in contrast, mixmers containing both HNA and unmodified RNA nucleotides display interesting properties. Two HNA-RNA mixmers bind to TAR with an equilibrium dissociation constant in the low-nanomolar range and show a reduced nuclease sensitivity. In addition, they show a moderate dependence on magnesium ions for binding to TAR. These HNA-RNA mixmers are able to inhibit transactivation of transcription in an in vitro assay.
Collapse
Affiliation(s)
- Gaëlle Kolb
- INSERM U 386; Université Victor Segalen Bordeaux 2, 146 rue Léo-Saignat, F-33076 Bordeaux Cedex, France
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Bugaut A, Toulmé JJ, Rayner B. Use of dynamic combinatorial chemistry for the identification of covalently appended residues that stabilize oligonucleotide complexes. Angew Chem Int Ed Engl 2005; 43:3144-7. [PMID: 15199562 DOI: 10.1002/anie.200454041] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anthony Bugaut
- INSERM U386, Université Victor Segalen Bordeaux 2, 146, rue Léo Saignat, 33076 Bordeaux Cedex, France
| | | | | |
Collapse
|
43
|
Dausse E, Cazenave C, Rayner B, Toulmé JJ. In vitro selection procedures for identifying DNA and RNA aptamers targeted to nucleic acids and proteins. Methods Mol Biol 2004; 288:391-410. [PMID: 15333917 DOI: 10.1385/1-59259-823-4:391] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
In vitro selection or systematic evolution of ligands by exponential enrichment is a combinatorial procedure that allows the identification of oligonucleotides showing properties of interest-so-called aptamers-through iterative selection/amplification rounds. Libraries containing as many as 1014 different sequences can be screened against a wide range of molecules. Ribonucleic acid (RNA), deoxyribonucleic acid (DNA), or chemically modified aptamers generally display high affinity and exquisite specificity of interaction with the target. Aptamers show a promising potential for diagnostic and therapeutic purposes. We describe here methods successfully used in our laboratory for the selection of RNA or DNA aptamers against an RNA structure (the transactivation response element of HIV-1) and a protein (the human ribonuclease H1).
Collapse
Affiliation(s)
- Eric Dausse
- INSERM U386, Modulation Artificielledes Gènes Eucaryotes, Université Victor Segalen Bordeaux 2, France
| | | | | | | |
Collapse
|
44
|
Da Rocha Gomes S, Dausse E, Toulmé JJ. Determinants of apical loop–internal loop RNA–RNA interactions involving the HCV IRES. Biochem Biophys Res Commun 2004; 322:820-6. [PMID: 15336537 DOI: 10.1016/j.bbrc.2004.07.185] [Citation(s) in RCA: 28] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2004] [Indexed: 01/13/2023]
Abstract
Domain II of the hepatitis C virus internal ribosome entry site is a major RNA structure involved in the viral mRNA translation. It comprises four different structural domains. We performed in vitro selection against the apical loop of the domain II and we identified RNA aptamers folding as an imperfect hairpin with an internal loop of interacting with the apical loop of the domain II. This RNA-RNA interaction creates apical loop-internal loop complex. The aptamer binds the target with an apparent K(d) of 35nM. In this study, the main structural elements of the target and the aptamer involved in the formation of the complex are characterized by mutation, deletion, and RNase probing analysis. We demonstrate that a complementary loop flanked by G,C rich upper and lower stems are crucial for such RNA-RNA interactions.
Collapse
Affiliation(s)
- Sonia Da Rocha Gomes
- INSERM U386, IFR 66, Université Victor Segalen Bordeaux 2, France and Institut Européen de Chimie et Biologie, Pessac, France
| | | | | |
Collapse
|
45
|
Abstract
Aptamers are RNA or DNA oligonucleotides identified within a randomly synthesized library, through an in vitro selection procedure. The selected candidates display a pre-determined property of interest with respect to a given target. Successful selection has been carried out against targets ranging from small (amino acids, antibiotics) to macro-molecules (proteins, nucleic acids). They generally show an affinity in the nanomolar range and a high specificity of target recognition. Interestingly, aptamers selected against purified targets in the test tube retain their properties within cells. RNA aptamers can be generated in situ from an appropriate DNA construct or delivered as nuclease-resistant oligonucleotide analogues. For example, aptamers recognizing RNA structure through loop-loop interactions modulate the trans-activation of in vitro transcription mediated by the TAR RNA element of human immunodeficiency virus type 1. Consequently, they constitute both exquisite tools for functional genomics analysis and promising prototypes of therapeutic agents. Natural aptameric motifs have been identified within mRNA sequences, which upon binding to a metabolite control the expression of the encoded gene, which is generally involved in the biosynthesis of this particular metabolite.
Collapse
Affiliation(s)
- Jean-Jacques Toulmé
- European Institute of Chemistry and Biology, INSERM U386, Université Victor Segalen, Bordeaux, France.
| | | | | |
Collapse
|
46
|
Bugaut A, Toulmé JJ, Rayner B. Use of Dynamic Combinatorial Chemistry for the Identification of Covalently Appended Residues that Stabilize Oligonucleotide Complexes. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200454041] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
47
|
Darfeuille F, Hansen JB, Orum H, Di Primo C, Toulmé JJ. LNA/DNA chimeric oligomers mimic RNA aptamers targeted to the TAR RNA element of HIV-1. Nucleic Acids Res 2004; 32:3101-7. [PMID: 15181175 PMCID: PMC434442 DOI: 10.1093/nar/gkh636] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [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: 11/14/2022] Open
Abstract
One of the major limitations of the use of phosphodiester oligonucleotides in cells is their rapid degradation by nucleases. To date, several chemical modifications have been employed to overcome this issue but insufficient efficacy and/or specificity have limited their in vivo usefulness. In this work conformationally restricted nucleotides, locked nucleic acid (LNA), were investigated to design nuclease resistant aptamers targeted against the HIV-1 TAR RNA. LNA/DNA chimeras were synthesized from a shortened version of the hairpin RNA aptamer identified by in vitro selection against TAR. The results indicate that these modifications confer good protection towards nuclease digestion. Electrophoretic mobility shift assays, thermal denaturation monitored by UV-spectroscopy and surface plasmon resonance experiments identified LNA/DNA TAR ligands that bind to TAR with a dissociation constant in the low nanomolar range as the parent RNA aptamer. The crucial G, A residues that close the aptamer loop remain a key structural determinant for stable LNA/DNA chimera-TAR complexes. This work provides evidence that LNA modifications alternated with DNA can generate stable structured RNA mimics for interacting with folded RNA targets.
Collapse
Affiliation(s)
- Fabien Darfeuille
- INSERM U386, Université Victor Segalen, 33076 Bordeaux cédex, France
| | | | | | | | | |
Collapse
|
48
|
Pileur F, Andreola ML, Dausse E, Michel J, Moreau S, Yamada H, Gaidamakov SA, Crouch RJ, Toulmé JJ, Cazenave C. Selective inhibitory DNA aptamers of the human RNase H1. Nucleic Acids Res 2003; 31:5776-88. [PMID: 14500841 PMCID: PMC206449 DOI: 10.1093/nar/gkg748] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Human RNase H1 binds double-stranded RNA via its N-terminal domain and RNA-DNA hybrid via its C-terminal RNase H domain, the latter being closely related to Escherichia coli RNase HI. Using SELEX, we have generated a set of DNA sequences that can bind efficiently (K(d) values ranging from 10 to 80 nM) to the human RNase H1. None of them could fold into a simple perfect double-stranded DNA hairpin confirming that double-stranded DNA does not constitute a trivial ligand for the enzyme. Only two of the 37 DNA aptamers selected were inhibitors of human RNase H1 activity. The two inhibitory oligomers, V-2 and VI-2, were quite different in structure with V-2 folding into a large, imperfect but stable hairpin loop. The VI-2 structure consists of a central region unimolecular quadruplex formed by stacking of two guanine quartets flanked by the 5' and 3' tails that form a stem of six base pairs. Base pairing between the 5' and 3' tails appears crucial for conferring the inhibitory properties to the aptamer. Finally, the inhibitory aptamers were capable of completely abolishing the action of an antisense oligonucleotide in a rabbit reticulocyte lysate supplemented with human RNase H1, with IC50 ranging from 50 to 100 nM.
Collapse
Affiliation(s)
- Frédéric Pileur
- INSERM U386, IFR Pathologies Infectieuses, Université Victor Segalen Bordeaux 2, 146, rue Léo Saignat, 33076 Bordeaux cedex, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Abstract
Oligonucleotides exhibiting a strong affinity and a high specificity for RNA hairpins were obtained by in vitro selection. Such oligomers give rise to loop-loop complexes with the target hairpins: the trans-activation responsive (TAR) element of the Human Immunodeficiency virus-1 (HIV-1) or subdomains of the Hepatitis C virus (HCV) mRNA. Chemically modified derivatives of an antiTAR aptamer were shown to compete out the binding of the viral protein Tat and to selectively inhibit the in vitro TAR-dependent transcription of a reporter gene. In addition, antisense oligomers derived from sequences selected against the domain IIId of the HCV internal ribosome entry site were shown to specifically block translation both in a cell-free assay and in cultured cells.
Collapse
Affiliation(s)
- Jean-Jacques Toulmé
- Inserm U386, IFR 66, Université Victor-Segalen, 146, rue Léo-Saignat, 33076 Bordeaux cedex 2, France.
| | | | | | | | | |
Collapse
|
50
|
Pecq JBL, Toulmé JJ. [Hommage to Professor Claude Hélène]. Bull Cancer 2003; 90:301-2. [PMID: 12801812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
|