1
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Salnikov ES, Aussenac F, Abel S, Purea A, Tordo P, Ouari O, Bechinger B. Dynamic Nuclear Polarization / solid-state NMR of membranes. Thermal effects and sample geometry. Solid State Nucl Magn Reson 2019; 100:70-76. [PMID: 30995597 DOI: 10.1016/j.ssnmr.2019.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 03/18/2019] [Accepted: 03/18/2019] [Indexed: 06/09/2023]
Abstract
Whereas specially designed dinitroxide biradicals, reconstitution protocols, oriented sample geometries and NMR probes have helped to much increase the DNP enhancement factors of membrane samples they still lag considerably behind those obtained from glasses made of protein solutions. Here we show that not only the MAS rotor material but also the distribution of the membrane samples within the NMR rotor have a pronounced effect on the DNP enhancement. These observations are rationalized with the cooling efficiency and the internal properties of the sample, monitored by their T1 relaxation, microwave ON versus OFF signal intensities and DNP effect. The data are suggestive that for membranes the speed of cooling has a pronounced effect on the membrane properties and concomitantly the distribution of biradicals within the sample.
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Affiliation(s)
| | | | - Sebastian Abel
- Aix-Marseille University, CNRS, UMR 7273, Institut de Chimie Radicalaire, 13013, Marseille, France
| | | | - Paul Tordo
- Aix-Marseille University, CNRS, UMR 7273, Institut de Chimie Radicalaire, 13013, Marseille, France
| | - Olivier Ouari
- Aix-Marseille University, CNRS, UMR 7273, Institut de Chimie Radicalaire, 13013, Marseille, France
| | - Burkhard Bechinger
- Institute of Chemistry, University of Strasbourg / CNRS, UMR7177, 67070, Strasbourg, France.
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2
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Combes S, Tran KT, Ayhan MM, Karoui H, Rockenbauer A, Tonetto A, Monnier V, Charles L, Rosas R, Viel S, Siri D, Tordo P, Clair S, Wang R, Bardelang D, Ouari O. Triangular Regulation of Cucurbit[8]uril 1:1 Complexes. J Am Chem Soc 2019; 141:5897-5907. [PMID: 30808163 DOI: 10.1021/jacs.9b00150] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Triangular shapes have inspired scientists over time and are common in nature, such as the flower petals of oxalis triangularis, the triangular faces of tetrahedrite crystals, and the icosahedron faces of virus capsids. Supramolecular chemistry has enabled the construction of triangular assemblies, many of which possess functional features. Among these structures, cucurbiturils have been used to build supramolecular triangles, and we recently reported paramagnetic cucurbit[8]uril (CB[8]) triangles, but the reasons for their formation remain unclear. Several parameters have now been identified to explain their formation. At first sight, the radical nature of the guest was of prime importance in obtaining the triangles, and we focused on extending this concept to biradicals to get supramolecular hexaradicals. Two sodium ions were systematically observed by ESI-MS in trimer structures, and the presence of Na+ triggered or strengthened the triangulation of CB[8]/guest 1:1 complexes in solution. X-ray crystallography and molecular modeling have allowed the proposal of two plausible sites of residence for the two sodium cations. We then found that a diamagnetic guest with an H-bond acceptor function is equally good at forming CB[8] triangles. Hence, a guest molecule containing a ketone function has been precisely triangulated thanks to CB[8] and sodium cations as determined by DOSY-NMR and DLS. A binding constant for the triangulation of 1:1 to 3:3 complexes is proposed. This concept has finally been extended to the triangulation of ditopic guests toward network formation by the reticulation of CB[8] triangles using dinitroxide biradicals.
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Affiliation(s)
- Sébastien Combes
- Aix Marseille Univ , CNRS, ICR , Marseille , France.,Centre de Recherche en Cancérologie de Marseille (CRCM), CNRS UMR7258, Inserm U1068, Institut Paoli-Calmettes , Aix Marseille Univ, UM105 , 13009 Marseille , France
| | | | - Mehmet Menaf Ayhan
- Aix Marseille Univ , CNRS, ICR , Marseille , France.,Department of Chemistry , Gebze Technical University , P.K.141 , 41400 Gebze , Kocaeli , Turkey
| | - Hakim Karoui
- Aix Marseille Univ , CNRS, ICR , Marseille , France
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry , Hungarian Academy of Sciences , P.O. Box. 286, 1519 Budapest , Hungary.,Department of Physics , Budapest University of Technology and Economics , 1111 Budapest , Hungary
| | - Alain Tonetto
- Aix Marseille Univ , CNRS, Centrale Marseille, FSCM (FR1739), PRATIM , F-13397 Marseille , France
| | - Valérie Monnier
- Aix Marseille Univ , CNRS, Centrale Marseille, FSCM, Spectropole , Marseille , France
| | | | - Roselyne Rosas
- Aix Marseille Univ , CNRS, Centrale Marseille, FSCM, Spectropole , Marseille , France
| | - Stéphane Viel
- Aix Marseille Univ , CNRS, ICR , Marseille , France.,Institut Universitaire de France , F-75005 Paris , France
| | - Didier Siri
- Aix Marseille Univ , CNRS, ICR , Marseille , France
| | - Paul Tordo
- Aix Marseille Univ , CNRS, ICR , Marseille , France
| | - Sylvain Clair
- Aix Marseille Univ, University of Toulon , CNRS, IM2NP, Marseille , France
| | - Ruibing Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences , University of Macau , Taipa , Macau , China
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3
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Lescic S, Karoui H, Hardy M, Charles L, Tordo P, Ouari O, Gaudel-Siri A, Siri D. Alkylperoxyl spin adducts of pyrroline-N-oxide spin traps: Experimental and theoretical CASSCF study of the unimolecular decomposition in organic solvent, potential applications in water. J PHYS ORG CHEM 2017. [DOI: 10.1002/poc.3677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sergiu Lescic
- Aix-Marseille University, CNRS, ICR; Marseille France
| | - Hakim Karoui
- Aix-Marseille University, CNRS, ICR; Marseille France
| | - Micaël Hardy
- Aix-Marseille University, CNRS, ICR; Marseille France
| | | | - Paul Tordo
- Aix-Marseille University, CNRS, ICR; Marseille France
| | - Olivier Ouari
- Aix-Marseille University, CNRS, ICR; Marseille France
| | | | - Didier Siri
- Aix-Marseille University, CNRS, ICR; Marseille France
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4
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Chaudhari S, Wisser D, Pinon AC, Berruyer P, Gajan D, Tordo P, Ouari O, Reiter C, Engelke F, Copéret C, Lelli M, Lesage A, Emsley L. Dynamic Nuclear Polarization Efficiency Increased by Very Fast Magic Angle Spinning. J Am Chem Soc 2017; 139:10609-10612. [PMID: 28692804 PMCID: PMC5719465 DOI: 10.1021/jacs.7b05194] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [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: 05/19/2017] [Indexed: 12/03/2022]
Abstract
Dynamic nuclear polarization (DNP) has recently emerged as a tool to enhance the sensitivity of solid-state NMR experiments. However, so far high enhancements (>100) are limited to relatively low magnetic fields, and DNP at fields higher than 9.4 T significantly drops in efficiency. Here we report solid-state Overhauser effect DNP enhancements of over 100 at 18.8 T. This is achieved through the unexpected discovery that enhancements increase rapidly with increasing magic angle spinning (MAS) rates. The measurements are made using 1,3-bisdiphenylene-2-phenylallyl dissolved in o-terphenyl at 40 kHz MAS. We introduce a source-sink diffusion model for polarization transfer which is capable of explaining the experimental observations. The advantage of this approach is demonstrated on mesoporous alumina with the acquisition of well-resolved DNP surface-enhanced 27Al cross-polarization spectra.
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Affiliation(s)
- Sachin
R. Chaudhari
- Institut
de Sciences Analytiques, Centre de RMN à Très Hauts
Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France
| | - Dorothea Wisser
- Institut
de Sciences Analytiques, Centre de RMN à Très Hauts
Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France
| | - Arthur C. Pinon
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Pierrick Berruyer
- Institut
de Sciences Analytiques, Centre de RMN à Très Hauts
Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France
| | - David Gajan
- Institut
de Sciences Analytiques, Centre de RMN à Très Hauts
Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France
| | - Paul Tordo
- Aix-Marseille
Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- Aix-Marseille
Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | | | | | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, CH-8093 Zürich, Switzerland
| | - Moreno Lelli
- Center for
Magnetic Resonance, Department of Chemistry, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy
| | - Anne Lesage
- Institut
de Sciences Analytiques, Centre de RMN à Très Hauts
Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France
| | - Lyndon Emsley
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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5
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Viger-Gravel J, Berruyer P, Gajan D, Basset JM, Lesage A, Tordo P, Ouari O, Emsley L. Frozen Acrylamide Gels as Dynamic Nuclear Polarization Matrices. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jasmine Viger-Gravel
- Institut des Sciences et Ingénierie Chimiques; Ecole Polytechnique Fédérale de Lausanne (EPFL); 1015 Lausanne Switzerland
| | - Pierrick Berruyer
- Université de Lyon; Institut des Sciences Analytiques (UMR 5280 CNRS/UCBL/ENS Lyon), Centre de RMN à Très Hauts Champs; 69100 Villeurbanne France
| | - David Gajan
- Université de Lyon; Institut des Sciences Analytiques (UMR 5280 CNRS/UCBL/ENS Lyon), Centre de RMN à Très Hauts Champs; 69100 Villeurbanne France
| | - Jean-Marie Basset
- King Abdullah University of Science and Technology (KAUST); KAUST Catalysis Center (KCC); Thuwal 23955-6900 Saudi Arabia
| | - Anne Lesage
- Université de Lyon; Institut des Sciences Analytiques (UMR 5280 CNRS/UCBL/ENS Lyon), Centre de RMN à Très Hauts Champs; 69100 Villeurbanne France
| | - Paul Tordo
- Aix Marseille Uni, CNRS, ICR UMR 7273; 13397 Marseille France
| | - Olivier Ouari
- Aix Marseille Uni, CNRS, ICR UMR 7273; 13397 Marseille France
| | - Lyndon Emsley
- Institut des Sciences et Ingénierie Chimiques; Ecole Polytechnique Fédérale de Lausanne (EPFL); 1015 Lausanne Switzerland
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6
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Salnikov ES, Abel S, Karthikeyan G, Karoui H, Aussenac F, Tordo P, Bechinger B, Ouari O. Dynamic Nuclear Polarization/Solid-State NMR Spectroscopy of Membrane Polypeptides: Free-Radical Optimization for Matrix-Free Lipid Bilayer Samples. Chemphyschem 2017; 18:2103-2113. [PMID: 28574169 DOI: 10.1002/cphc.201700389] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 05/24/2017] [Indexed: 01/07/2023]
Abstract
Dynamic nuclear polarization (DNP) boosts the sensitivity of NMR spectroscopy by orders of magnitude and makes investigations previously out of scope possible. For magic-angle-spinning (MAS) solid-state NMR spectroscopy studies, the samples are typically mixed with biradicals dissolved in a glass-forming solvent and are investigated at cryotemperatures. Herein, we present new biradical polarizing agents developed for matrix-free samples such as supported lipid bilayers, which are systems widely used for the investigation of membrane polypeptides of high biomedical importance. A series of 11 biradicals with different structures, geometries, and physicochemical properties were comprehensively tested for DNP performance in lipid bilayers, some of them developed specifically for DNP investigations of membranes. The membrane-anchored biradicals PyPol-C16, AMUPOL-cholesterol, and bTurea-C16 were found to exhibit improved g-tensor alignment, inter-radical distance, and dispersion. Consequently, these biradicals show the highest signal enhancement factors so far obtained for matrix-free membranes or other matrix-free samples and may potentially shorten NMR acquisition times by three orders of magnitude. Furthermore, the optimal biradical-to-lipid ratio, sample deuteration, and membrane lipid composition were determined under static and MAS conditions. To rationalize biradical performance better, DNP enhancement was measured by using the 13 C and 15 N signals of lipids and a peptide as a function of the biradical concentration, DNP build-up time, resonance line width, quenching effect, microwave power, and MAS frequency.
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Affiliation(s)
- Evgeniy S Salnikov
- Institut de chimie, UMR 7177, Université de Strasbourg/CNRS, 4, rue Blaise Pascal, 67070, Strasbourg, France
| | - Sébastien Abel
- Aix Marseille Univ, CNRS, ICR UMR 7273, 13013, Marseille, France
| | | | - Hakim Karoui
- Aix Marseille Univ, CNRS, ICR UMR 7273, 13013, Marseille, France
| | - Fabien Aussenac
- Bruker Biospin, 34, rue de l'industrie, 67166, Wissembourg, France
| | - Paul Tordo
- Aix Marseille Univ, CNRS, ICR UMR 7273, 13013, Marseille, France
| | - Burkhard Bechinger
- Institut de chimie, UMR 7177, Université de Strasbourg/CNRS, 4, rue Blaise Pascal, 67070, Strasbourg, France
| | - Olivier Ouari
- Aix Marseille Univ, CNRS, ICR UMR 7273, 13013, Marseille, France
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7
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Liao WC, Ong TC, Gajan D, Bernada F, Sauvée C, Yulikov M, Pucino M, Schowner R, Schwarzwälder M, Buchmeiser MR, Jeschke G, Tordo P, Ouari O, Lesage A, Emsley L, Copéret C. Dendritic polarizing agents for DNP SENS. Chem Sci 2017; 8:416-422. [PMID: 28451187 PMCID: PMC5365053 DOI: 10.1039/c6sc03139k] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [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: 07/15/2016] [Accepted: 08/19/2016] [Indexed: 01/22/2023] Open
Abstract
Dendrimer-shielded polarizing agents for the application of DNP SENS to reactive surfaces.
Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) is an effective method to significantly improve solid-state NMR investigation of solid surfaces. The presence of unpaired electrons (polarizing agents) is crucial for DNP, but it has drawbacks such as leading to faster nuclear spin relaxation, or even reaction with the substrate under investigation. The latter can be a particular problem for heterogeneous catalysts. Here, we present a series of carbosilane-based dendritic polarizing agents, in which the bulky dendrimer can reduce the interaction between the solid surface and the free radical. We thereby preserve long nuclear T′2 of the surface species, and even successfully enhance a reactive heterogeneous metathesis catalyst.
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Affiliation(s)
- Wei-Chih Liao
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
| | - Ta-Chung Ong
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
| | - David Gajan
- Centre de RMN à Très Hauts Champs , Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1) , Université de Lyon , 69100 Villeurbanne , France
| | - Florian Bernada
- Aix-Marseille Univ , CNRS , ICR UMR 7273 , Marseille , 13013 , France
| | - Claire Sauvée
- Aix-Marseille Univ , CNRS , ICR UMR 7273 , Marseille , 13013 , France
| | - Maxim Yulikov
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
| | - Margherita Pucino
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
| | - Roman Schowner
- Institut für Polymerchemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany
| | - Martin Schwarzwälder
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
| | - Michael R Buchmeiser
- Institut für Polymerchemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 Stuttgart , Germany
| | - Gunnar Jeschke
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
| | - Paul Tordo
- Aix-Marseille Univ , CNRS , ICR UMR 7273 , Marseille , 13013 , France
| | - Olivier Ouari
- Aix-Marseille Univ , CNRS , ICR UMR 7273 , Marseille , 13013 , France
| | - Anne Lesage
- Centre de RMN à Très Hauts Champs , Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1) , Université de Lyon , 69100 Villeurbanne , France
| | - Lyndon Emsley
- Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 1-5 , 8093 Zürich , Switzerland .
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8
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Kaur H, Lakatos A, Spadaccini R, Vogel R, Hoffmann C, Becker-Baldus J, Ouari O, Tordo P, Mchaourab H, Glaubitz C. The ABC exporter MsbA probed by solid state NMR – challenges and opportunities. Biol Chem 2016; 396:1135-49. [PMID: 25849794 DOI: 10.1515/hsz-2015-0119] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/26/2015] [Indexed: 01/20/2023]
Abstract
ATP binding cassette (ABC) transporters form a superfamily of integral membrane proteins involved in translocation of substrates across the membrane driven by ATP hydrolysis. Despite available crystal structures and extensive biochemical data, many open questions regarding their transport mechanisms remain. Therefore, there is a need to explore spectroscopic techniques such as solid state NMR in order to bridge the gap between structural and mechanistic data. In this study, we investigate the feasibility of using Escherichia coli MsbA as a model ABC transporter for solid state NMR studies. We show that optimised solubilisation and reconstitution procedures enable preparing stable and homogenous protein samples. Depending on the duration of solubilisation, MsbA can be obtained in either an apo- or in a native lipid A bound form. Building onto these optimisations, the first promising MAS-NMR spectra with narrow lines have been recorded. However, further sensitivity improvements are required so that complex NMR experiments can be recorded within a reasonable amount of time. We therefore demonstrate the usability of paramagnetic doping for rapid data acquisition and explore dynamic nuclear polarisation as a method for general signal enhancement. Our results demonstrate that solid state NMR provides an opportunity to address important biological questions related to complex mechanisms of ABC transporters.
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9
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Sauvée C, Casano G, Abel S, Rockenbauer A, Akhmetzyanov D, Karoui H, Siri D, Aussenac F, Maas W, Weber RT, Prisner T, Rosay M, Tordo P, Ouari O. Tailoring of Polarizing Agents in the bTurea Series for Cross-Effect Dynamic Nuclear Polarization in Aqueous Media. Chemistry 2016; 22:5598-606. [PMID: 26992052 DOI: 10.1002/chem.201504693] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [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: 11/21/2015] [Indexed: 11/10/2022]
Abstract
A series of 18 nitroxide biradicals derived from bTurea has been prepared, and their enhancement factors ɛ ((1)H) in cross-effect dynamic nuclear polarization (CE DNP) NMR experiments at 9.4 and 14.1 T and 100 K in a DNP-optimized glycerol/water matrix ("DNP juice") have been studied. We observe that ɛ ((1)H) is strongly correlated with the substituents on the polarizing agents, and its trend is discussed in terms of different molecular parameters: solubility, average e-e distance, relative orientation of the nitroxide moieties, and electron spin relaxation times. We show that too short an e-e distance or too long a T1e can dramatically limit ɛ ((1)H). Our study also shows that the molecular structure of AMUPol is not optimal and its ɛ ((1)H) could be further improved through stronger interaction with the glassy matrix and a better orientation of the TEMPO moieties. A new AMUPol derivative introduced here provides a better ɛ ((1)H) than AMUPol itself (by a factor of ca. 1.2).
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Affiliation(s)
- Claire Sauvée
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Sébastien Abel
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Department of Physics, Budapest University of Technology and Economics and MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111, Budapest, Hungary
| | - Dimitry Akhmetzyanov
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438, Frankfurt-am-Main, Germany
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Didier Siri
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France
| | - Fabien Aussenac
- Bruker BioSpin S.A.S., 34 rue de l'industrie, 67166, Wissembourg, France
| | - Werner Maas
- Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts, 01821, USA
| | - Ralph T Weber
- Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts, 01821, USA
| | - Thomas Prisner
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438, Frankfurt-am-Main, Germany
| | - Mélanie Rosay
- Bruker BioSpin Corporation, 15 Fortune Drive, Billerica, Massachusetts, 01821, USA
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France.
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397, Marseille cedex 20, France.
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10
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Salnikov ES, Aisenbrey C, Aussenac F, Ouari O, Sarrouj H, Reiter C, Tordo P, Engelke F, Bechinger B. Membrane topologies of the PGLa antimicrobial peptide and a transmembrane anchor sequence by Dynamic Nuclear Polarization/solid-state NMR spectroscopy. Sci Rep 2016; 6:20895. [PMID: 26876950 PMCID: PMC4753517 DOI: 10.1038/srep20895] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [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: 12/09/2015] [Accepted: 01/11/2016] [Indexed: 12/23/2022] Open
Abstract
Dynamic Nuclear Polarization (DNP) has been introduced to overcome the sensitivity limitations of nuclear magnetic resonance (NMR) spectroscopy also of supported lipid bilayers. When investigated by solid-state NMR techniques the approach typically involves doping the samples with biradicals and their investigation at cryo-temperatures. Here we investigated the effects of temperature and membrane hydration on the topology of amphipathic and hydrophobic membrane polypeptides. Although the antimicrobial PGLa peptide in dimyristoyl phospholipids is particularly sensitive to topological alterations, the DNP conditions represent well its membrane alignment also found in bacterial lipids at ambient temperature. With a novel membrane-anchored biradical and purpose-built hardware a 17-fold enhancement in NMR signal intensity is obtained by DNP which is one of the best obtained for a truly static matrix-free system. Furthermore, a membrane anchor sequence encompassing 19 hydrophobic amino acid residues was investigated. Although at cryotemperatures the transmembrane domain adjusts it membrane tilt angle by about 10 degrees, the temperature dependence of two-dimensional separated field spectra show that freezing the motions can have beneficial effects for the structural analysis of this sequence.
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Affiliation(s)
| | - Christopher Aisenbrey
- University of Strasbourg/CNRS, UMR7177, Chemistry Institute, 67070 Strasbourg, France
| | - Fabien Aussenac
- Bruker BioSpin, 34, rue de l’Industrie, 67166 Wissembourg, France
| | - Olivier Ouari
- Aix-Marseille University, Institut de Chimie Radicalaire, UMR 7273, Faculté des Sciences, 13397 Marseille, Cédex 20, France
| | - Hiba Sarrouj
- University of Strasbourg/CNRS, UMR7177, Chemistry Institute, 67070 Strasbourg, France
- Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | | | - Paul Tordo
- Aix-Marseille University, Institut de Chimie Radicalaire, UMR 7273, Faculté des Sciences, 13397 Marseille, Cédex 20, France
| | - Frank Engelke
- Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | - Burkhard Bechinger
- University of Strasbourg/CNRS, UMR7177, Chemistry Institute, 67070 Strasbourg, France
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11
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Ayhan MM, Karoui H, Hardy M, Rockenbauer A, Charles L, Rosas R, Udachin K, Tordo P, Bardelang D, Ouari O. Correction to "Comprehensive Synthesis of Monohydroxy-Cucurbit[n]urils (n = 5, 6, 7, 8): High Purity and High Conversions". J Am Chem Soc 2016; 138:2060. [PMID: 26839971 DOI: 10.1021/jacs.6b00188] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Lelli M, Chaudhari SR, Gajan D, Casano G, Rossini AJ, Ouari O, Tordo P, Lesage A, Emsley L. Solid-State Dynamic Nuclear Polarization at 9.4 and 18.8 T from 100 K to Room Temperature. J Am Chem Soc 2015; 137:14558-61. [PMID: 26555676 PMCID: PMC4671100 DOI: 10.1021/jacs.5b08423] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [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] [Indexed: 11/30/2022]
Abstract
![]()
Efficient dynamic nuclear polarization
(DNP) in solids, which enables
very high sensitivity NMR experiments, is currently limited to temperatures
of around 100 K and below. Here we show how by choosing an adequate
solvent, 1H cross effect DNP enhancements of over 80 can
be obtained at 240 K. To achieve this we use the biradical TEKPol
dissolved in a glassy phase of ortho-terphenyl (OTP).
We study the solvent DNP enhancement of both TEKPol and BDPA in OTP
in the range from 100 to 300 K at 9.4 and 18.8 T. Surprisingly, we
find that the DNP enhancement decreases only relatively slowly for
temperatures below the glass transition of OTP (Tg = 243 K), and 1H enhancements around 15–20
at ambient temperature can be observed. We use this to monitor molecular
dynamic transitions in the pharmaceutically relevant solids Ambroxol
and Ibuprofen.
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Affiliation(s)
- Moreno Lelli
- Institut de Sciences Analytiques, Centre de RMN à Très Hauts Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1) , 69100 Villeurbanne, France
| | - Sachin R Chaudhari
- Institut de Sciences Analytiques, Centre de RMN à Très Hauts Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1) , 69100 Villeurbanne, France
| | - David Gajan
- Institut de Sciences Analytiques, Centre de RMN à Très Hauts Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1) , 69100 Villeurbanne, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS, ICR UMR 7273 , 13397 Marseille, France
| | - Aaron J Rossini
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, ICR UMR 7273 , 13397 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273 , 13397 Marseille, France
| | - Anne Lesage
- Institut de Sciences Analytiques, Centre de RMN à Très Hauts Champs, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1) , 69100 Villeurbanne, France
| | - Lyndon Emsley
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
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13
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Ayhan MM, Casano G, Karoui H, Rockenbauer A, Monnier V, Hardy M, Tordo P, Bardelang D, Ouari O. Frontispiece: EPR Studies of the Binding Properties, Guest Dynamics, and Inner‐Space Dimensions of a Water‐Soluble Resorcinarene Capsule. Chemistry 2015. [DOI: 10.1002/chem.201584662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mehmet Menaf Ayhan
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
- Department of Chemistry, Gebze Technical University, P.K.:141, 41400 Gebze, Kocaeli (Turkey)
| | - Gilles Casano
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Hakim Karoui
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences and, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest (Hungary)
| | - Valérie Monnier
- Aix‐Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille (France)
| | - Micaël Hardy
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Paul Tordo
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - David Bardelang
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Olivier Ouari
- Aix‐Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
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14
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Salnikov ES, Sarrouj H, Reiter C, Aisenbrey C, Purea A, Aussenac F, Ouari O, Tordo P, Fedotenko I, Engelke F, Bechinger B. Solid-State NMR/Dynamic Nuclear Polarization of Polypeptides in Planar Supported Lipid Bilayers. J Phys Chem B 2015; 119:14574-83. [PMID: 26487390 DOI: 10.1021/acs.jpcb.5b07341] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Dynamic nuclear polarization has been developed to overcome the limitations of the inherently low signal intensity of NMR spectroscopy. This technique promises to be particularly useful for solid-state NMR spectroscopy where the signals are broadened over a larger frequency range and most investigations rely on recording low gamma nuclei. To extend the range of possible investigations, a triple-resonance flat-coil solid-state NMR probe is presented with microwave irradiation capacities allowing the investigation of static samples at temperatures of 100 K, including supported lipid bilayers. The probe performance allows for two-dimensional separated local field experiments with high-power Lee-Goldberg decoupling and cross-polarization under simultaneous irradiation from a gyrotron microwave generator. Efficient cooling of the sample turned out to be essential for best enhancements and line shape and necessitated the development of a dedicated cooling chamber. Furthermore, a new membrane-anchored biradical is presented, and the geometry of supported membranes was optimized not only for good membrane alignment, handling, stability, and filling factor of the coil but also for heat and microwave dissipation. Enhancement factors of 17-fold were obtained, and a two-dimensional PISEMA spectrum of a transmembrane helical peptide was obtained in less than 2 h.
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Affiliation(s)
- Evgeniy S Salnikov
- Institute of Chemistry, University of Strasbourg/CNRS, UMR7177 , 67070 Strasbourg, France
| | - Hiba Sarrouj
- Institute of Chemistry, University of Strasbourg/CNRS, UMR7177 , 67070 Strasbourg, France.,Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | | | - Christopher Aisenbrey
- Institute of Chemistry, University of Strasbourg/CNRS, UMR7177 , 67070 Strasbourg, France
| | - Armin Purea
- Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | - Fabien Aussenac
- Bruker BioSpin, 34, rue de l'Industrie, 67166 Wissembourg, France
| | - Olivier Ouari
- Aix Marseille Université, CNRS , Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
| | - Paul Tordo
- Aix Marseille Université, CNRS , Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
| | - Illya Fedotenko
- Aix Marseille Université, CNRS , Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
| | - Frank Engelke
- Bruker BioSpin, Silberstreifen, 76287 Rheinstetten, Germany
| | - Burkhard Bechinger
- Institute of Chemistry, University of Strasbourg/CNRS, UMR7177 , 67070 Strasbourg, France
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15
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Kubicki DJ, Casano G, Schwarzwälder M, Abel S, Sauvée C, Ganesan K, Yulikov M, Rossini AJ, Jeschke G, Copéret C, Lesage A, Tordo P, Ouari O, Emsley L. Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization. Chem Sci 2015; 7:550-558. [PMID: 29896347 PMCID: PMC5952883 DOI: 10.1039/c5sc02921j] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [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: 08/07/2015] [Accepted: 10/12/2015] [Indexed: 12/27/2022] Open
Abstract
A series of 37 dinitroxide biradicals have been prepared and their performance studied as polarizing agents in cross-effect DNP NMR experiments at 9.4 T and 100 K in 1,1,2,2-tetrachloroethane (TCE). We observe that in this regime the DNP performance is strongly correlated with the substituents on the polarizing agents, and electron and nuclear spin relaxation times, with longer relaxation times leading to better enhancements. We also observe that deuteration of the radicals generally leads to better DNP enhancement but with longer build-up time. One of the new radicals introduced here provides the best performance obtained so far under these conditions.
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Affiliation(s)
- Dominik J Kubicki
- Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland .
| | - Gilles Casano
- Aix-Marseille Université , CNRS , ICR UMR 7273 , 13397 Marseille , France . ;
| | - Martin Schwarzwälder
- ETH Zurich , Department of Chemistry, Laboratory of Inorganic Chemistry , 8093 Zurich , Switzerland
| | - Sébastien Abel
- Aix-Marseille Université , CNRS , ICR UMR 7273 , 13397 Marseille , France . ;
| | - Claire Sauvée
- Aix-Marseille Université , CNRS , ICR UMR 7273 , 13397 Marseille , France . ;
| | - Karthikeyan Ganesan
- Aix-Marseille Université , CNRS , ICR UMR 7273 , 13397 Marseille , France . ;
| | - Maxim Yulikov
- ETH Zurich , Department of Chemistry, Laboratory of Inorganic Chemistry , 8093 Zurich , Switzerland
| | - Aaron J Rossini
- Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland .
| | - Gunnar Jeschke
- ETH Zurich , Department of Chemistry, Laboratory of Inorganic Chemistry , 8093 Zurich , Switzerland
| | - Christophe Copéret
- ETH Zurich , Department of Chemistry, Laboratory of Inorganic Chemistry , 8093 Zurich , Switzerland
| | - Anne Lesage
- Université de Lyon , Institut de Sciences Analytiques (CNRS / ENS de Lyon / UCB-Lyon 1) , Centre de RMN à Très Hauts Champs , 69100 Villeurbanne , France
| | - Paul Tordo
- Aix-Marseille Université , CNRS , ICR UMR 7273 , 13397 Marseille , France . ;
| | - Olivier Ouari
- Aix-Marseille Université , CNRS , ICR UMR 7273 , 13397 Marseille , France . ;
| | - Lyndon Emsley
- Institut des Sciences et Ingénierie Chimiques , Ecole Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland .
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16
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Ayhan MM, Casano G, Karoui H, Rockenbauer A, Monnier V, Hardy M, Tordo P, Bardelang D, Ouari O. EPR Studies of the Binding Properties, Guest Dynamics, and Inner-Space Dimensions of a Water-Soluble Resorcinarene Capsule. Chemistry 2015; 21:16404-10. [PMID: 26403999 DOI: 10.1002/chem.201502212] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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: 06/05/2015] [Indexed: 12/11/2022]
Abstract
Nitroxide free radicals have been used to study the inner space of one of Rebek's water-soluble capsules. EPR and (1) H NMR spectroscopy, ESI-MS, and DFT calculations showed a preference for the formation of 1:2 complexes. EPR titrations allowed us to determine binding constants (Ka ) in the order of 10(7) M(-2) . EPR spectral-shape analysis provided information on the guest rotational dynamics within the capsule. The interplay between optimum hydrogen bonding upon capsule formation and steric strain for guest accommodation highlights some degree of flexibility for guest inclusion, particularly at the center of the capsule where the hydrogen bond seam can be barely distorted or slightly disturbed.
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Affiliation(s)
- Mehmet Menaf Ayhan
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France).,Department of Chemistry, Gebze Technical University, P.K.:141, 41400 Gebze, Kocaeli (Turkey)
| | - Gilles Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences and, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest (Hungary)
| | - Valérie Monnier
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille (France)
| | - Micaël Hardy
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Paul Tordo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France)
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille (France).
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17
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Ayhan MM, Karoui H, Hardy M, Rockenbauer A, Charles L, Rosas R, Udachin K, Tordo P, Bardelang D, Ouari O. Comprehensive Synthesis of Monohydroxy-Cucurbit[n]urils (n = 5, 6, 7, 8): High Purity and High Conversions. J Am Chem Soc 2015. [PMID: 26197228 DOI: 10.1021/jacs.5b04553] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We describe a photochemical method to introduce a single alcohol function directly on cucurbit[n]urils (n = 5, 6, 7, 8) with conversions of the order 95-100% using hydrogen peroxide and UV light. The reaction was easily scaled up to 1 g for CB[6] and CB[7]. Spin trapping of cucurbituril radicals combined with MS experiments allowed us to get insights about the reaction mechanism and characterize CB[5], CB[6], CB[7], and CB[8] monofunctional compounds. Experiments involving (18)O isotopically labeled water indicated that the mechanism was complex and showed signs of both radical and ionic intermediates. DFT calculations allowed estimating the Bond Dissociation Energies (BDEs) of each hydrogen atom type in the CB series, providing an explanation of the higher reactivity of the "equatorial" C-H position of CB[n] compounds. These results also showed that, for CB[8], direct functionalization on the cucurbituril skeleton is more difficult because one of the methylene hydrogen atoms (Hb) has its BDE lowering within the series and coming close to that of Hc, thus opening the way to other types of free radicals generated on the CB[8] skeleton leading to several side products. Yet CB[5]-(OH)1 and CB[8]-(OH)1, the first CB[8] derivative, were obtained in excellent yields thanks to the soft method presented here.
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Affiliation(s)
- Mehmet M Ayhan
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France.,‡Department of Chemistry, Gebze Technical University, P.K.:141, 41400 Gebze, Kocaeli, Turkey
| | - Hakim Karoui
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Micaël Hardy
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Antal Rockenbauer
- § Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Department of Physics, Budapest University of Technology and Economics, Budafoki ut 8, 1111 Budapest, Hungary
| | - Laurence Charles
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Roselyne Rosas
- ∥Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Konstantin Udachin
- ⊥National Research Council Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6, Canada
| | - Paul Tordo
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - David Bardelang
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- †Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
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18
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Abstract
A dinitroxide biradical (dCdO) has the peculiar tendency to crystallize in non-centrosymmetric polar space groups either as a stable dichloromethane solvate or as a pure phase. The molecules arrange with no compensation of their dipolar moment resulting in net macroscopic polar order.
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Affiliation(s)
- Cédric Ysacco
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
| | - Michel Giorgi
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
| | - David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France
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19
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van der Cruijsen EAW, Koers EJ, Sauvée C, Hulse RE, Weingarth M, Ouari O, Perozo E, Tordo P, Baldus M. Biomolecular DNP-Supported NMR Spectroscopy using Site-Directed Spin Labeling. Chemistry 2015; 21:12971-7. [DOI: 10.1002/chem.201501376] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Indexed: 12/24/2022]
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20
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Casano G, Poulhès F, Tran TK, Ayhan MM, Karoui H, Siri D, Gaudel-Siri A, Rockenbauer A, Jeschke G, Bardelang D, Tordo P, Ouari O. High binding yet accelerated guest rotation within a cucurbit[7]uril complex. Toward paramagnetic gyroscopes and rolling nanomachines. Nanoscale 2015; 7:12143-12150. [PMID: 26123621 DOI: 10.1039/c5nr03288a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The (15-oxo-3,7,11-triazadispiro[5.1.5.3]hexadec-7-yl)oxidanyl, a bis-spiropiperidinium nitroxide derived from TEMPONE, can be included in cucurbit[7]uril to form a strong (K(a)∼ 2 × 10(5) M(-1)) CB[7]@bPTO complex. EPR and MS spectra, DFT calculations, and unparalleled increased resistance (a factor of ∼10(3)) toward ascorbic acid reduction show evidence of deep inclusion of bPTO inside CB[7]. The unusual shape of the CB[7]@bPTO EPR spectrum can be explained by an anisotropic Brownian rotational diffusion, the global tumbling of the complex being slower than rotation of bPTO around its "long molecular axis" inside CB[7]. The CB[7] (stator) with the encapsulated bPTO (rotator) behaves as a supramolecular paramagnetic rotor with increased rotational speed of the rotator that has great potential for advanced nanoscale machines requiring wheels such as cucurbiturils with virtually no friction between the wheel and the axle for optimum wheel rotation (i.e. nanopulleys and nanocars).
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Affiliation(s)
- G Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France.
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21
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Maciejko J, Mehler M, Kaur J, Lieblein T, Morgner N, Ouari O, Tordo P, Becker-Baldus J, Glaubitz C. Visualizing Specific Cross-Protomer Interactions in the Homo-Oligomeric Membrane Protein Proteorhodopsin by Dynamic-Nuclear-Polarization-Enhanced Solid-State NMR. J Am Chem Soc 2015; 137:9032-43. [DOI: 10.1021/jacs.5b03606] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | | | | | | | | | - Olivier Ouari
- Aix-Marseille Université,
CNRS, ICR, UMR 7273, 13013 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université,
CNRS, ICR, UMR 7273, 13013 Marseille, France
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22
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Abbas K, Hardy M, Poulhès F, Karoui H, Tordo P, Ouari O, Peyrot F. Medium-throughput ESR detection of superoxide production in undetached adherent cells using cyclic nitrone spin traps. Free Radic Res 2015; 49:1122-8. [PMID: 25968949 DOI: 10.3109/10715762.2015.1045504] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [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: 11/13/2022]
Abstract
Spin trapping with cyclic nitrones coupled to electron spin resonance (ESR) is recognized as a specific method of detection of oxygen free radicals in biological systems, especially in culture cells. In this case, the detection is usually performed on cell suspensions, which is however unsuitable when adhesion influences free radical production. Here, we performed ESR detection of superoxide with four spin traps (5-diethoxyphosphoryl-5-methyl-1-pyrroline N-oxide, DEPMPO; 5-diisopropoxyphosphoryl-5-methyl-1-pyrroline N-oxide, DIPPMPO; (4R*, 5R*)-5-(diisopropyloxyphosphoryl)-5-methyl-4-[({[2-(triphenylphosphonio)ethyl]carbamoyl}oxy)methyl]pyrroline N-oxide bromide, Mito-DIPPMPO; and 6-monodeoxy-6-mono-4-[(5-diisopropoxyphosphoryl-5-methyl-1-pyrroline-N-oxide)-ethylenecarbamoyl-(2,3-di-O-methyl) hexakis (2,3,6-tri-O-methyl)]-β-cyclodextrin, CD-DIPPMPO) directly on RAW 264.7 macrophages cultured on microscope coverslip glasses after phorbol 12-myristate 13-acetate (PMA) stimulation. Distinct ESR spectra were obtained with each spin trap using this method. CD-DIPPMPO, a recently published phosphorylated cyclic nitrone bearing a permethylated β-cyclodextrin moiety, was confirmed as the most specific spin trap of the superoxide radical, with exclusive detection of the superoxide adduct. ESR detection performed on cells attached to coverslips represents significant advances over other methods in terms of simplicity, speed, and measurement under near-physiological conditions. It thus opens the way for numerous applications, such as medium-throughput screening of antioxidants and reactive oxygen species (ROS)-modulating agents.
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Affiliation(s)
- K Abbas
- LCBPT, UMR 8601 CNRS - Paris Descartes University , Sorbonne Paris Cité, Paris , France
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23
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Le D, Ziarelli F, Phan TNT, Mollica G, Thureau P, Aussenac F, Ouari O, Gigmes D, Tordo P, Viel S. Up to 100% Improvement in Dynamic Nuclear Polarization Solid-State NMR Sensitivity Enhancement of Polymers by Removing Oxygen. Macromol Rapid Commun 2015; 36:1416-21. [DOI: 10.1002/marc.201500133] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/23/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Dao Le
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Fabio Ziarelli
- Aix-Marseille Université; CNRS, Centrale Marseille; Fédération des Sciences Chimiques (FR 1739); 13397 Marseille cedex 20 France
| | - Trang N. T. Phan
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Giulia Mollica
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Pierre Thureau
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | | | - Olivier Ouari
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Didier Gigmes
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Paul Tordo
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
| | - Stéphane Viel
- Aix-Marseille Université; CNRS, ICR (UMR 7273); 13397 Marseille cedex 20 France
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24
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Bardelang D, Casano G, Poulhès F, Karoui H, Filippini J, Rockenbauer A, Rosas R, Monnier V, Siri D, Gaudel-Siri A, Ouari O, Tordo P. Spin Exchange Monitoring of the Strong Positive Homotropic Allosteric Binding of a Tetraradical by a Synthetic Receptor in Water. J Am Chem Soc 2014; 136:17570-7. [DOI: 10.1021/ja509586k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Gilles Casano
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Florent Poulhès
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Jessica Filippini
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Antal Rockenbauer
- Department of Physics, Budapest University of Technology and Economics and MTA-BME Condensed Matter Research Group, Budafoki ut 8, 1111 Budapest, Hungary
| | - Roselyne Rosas
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Valérie Monnier
- Aix-Marseille Université, CNRS, Spectropole, FR 1739, 13013 Marseille, France
| | - Didier Siri
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Anouk Gaudel-Siri
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13397 Marseille, France
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25
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Kubicki D, Rossini AJ, Purea A, Zagdoun A, Ouari O, Tordo P, Engelke F, Lesage A, Emsley L. Amplifying dynamic nuclear polarization of frozen solutions by incorporating dielectric particles. J Am Chem Soc 2014; 136:15711-8. [PMID: 25285480 PMCID: PMC4671102 DOI: 10.1021/ja5088453] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [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: 08/27/2014] [Indexed: 11/28/2022]
Abstract
There is currently great interest in understanding the limits on NMR signal enhancements provided by dynamic nuclear polarization (DNP), and in particular if the theoretical maximum enhancements can be achieved. We show that over a 2-fold improvement in cross-effect DNP enhancements can be achieved in MAS experiments on frozen solutions by simply incorporating solid particles into the sample. At 9.4 T and ∼105 K, enhancements up to εH = 515 are obtained in this way, corresponding to 78% of the theoretical maximum. We also underline that degassing of the sample is important to achieve highest enhancements. We link the amplification effect to the dielectric properties of the solid material, which probably gives rise to scattering, diffraction, and amplification of the microwave field in the sample. This is substantiated by simulations of microwave propagation. A reduction in sample heating at a given microwave power also likely occurs due to reduced dielectric loss. Simulations indicate that the microwave field (and thus the DNP enhancement) is inhomogeneous in the sample, and we deduce that in these experiments between 5 and 10% of the solution actually yields the theoretical maximum signal enhancement of 658. The effect is demonstrated for a variety of particles added to both aqueous and organic biradical solutions.
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Affiliation(s)
- Dominik
J. Kubicki
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Aaron J. Rossini
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Armin Purea
- Bruker
Biospin GmbH, Silberstreifen, D-76287 Rheinstetten, Germany
| | - Alexandre Zagdoun
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Olivier Ouari
- Aix
Marseille-Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Paul Tordo
- Aix
Marseille-Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Frank Engelke
- Bruker
Biospin GmbH, Silberstreifen, D-76287 Rheinstetten, Germany
| | - Anne Lesage
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
| | - Lyndon Emsley
- Institut
de Sciences Analytiques (CNRS/ENS de Lyon/UCB-Lyon 1), Centre de RMN
à Très Hauts Champs, Université
de Lyon, 69100 Villeurbanne, France
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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26
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Koers EJ, van der Cruijsen EAW, Rosay M, Weingarth M, Prokofyev A, Sauvée C, Ouari O, van der Zwan J, Pongs O, Tordo P, Maas WE, Baldus M. NMR-based structural biology enhanced by dynamic nuclear polarization at high magnetic field. J Biomol NMR 2014; 60:157-68. [PMID: 25284462 DOI: 10.1007/s10858-014-9865-8] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 09/23/2014] [Indexed: 05/04/2023]
Abstract
Dynamic nuclear polarization (DNP) has become a powerful method to enhance spectroscopic sensitivity in the context of magnetic resonance imaging and nuclear magnetic resonance spectroscopy. We show that, compared to DNP at lower field (400 MHz/263 GHz), high field DNP (800 MHz/527 GHz) can significantly enhance spectral resolution and allows exploitation of the paramagnetic relaxation properties of DNP polarizing agents as direct structural probes under magic angle spinning conditions. Applied to a membrane-embedded K(+) channel, this approach allowed us to refine the membrane-embedded channel structure and revealed conformational substates that are present during two different stages of the channel gating cycle. High-field DNP thus offers atomic insight into the role of molecular plasticity during the course of biomolecular function in a complex cellular environment.
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Affiliation(s)
- Eline J Koers
- NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, 3584 CH, Utrecht, The Netherlands
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27
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Mollica G, Le D, Ziarelli F, Casano G, Ouari O, Phan TNT, Aussenac F, Thureau P, Gigmes D, Tordo P, Viel S. Observing Apparent Nonuniform Sensitivity Enhancements in Dynamic Nuclear Polarization Solid-State NMR Spectra of Polymers. ACS Macro Lett 2014; 3:922-925. [PMID: 35596360 DOI: 10.1021/mz500459p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
High-field dynamic nuclear polarization (DNP) may enhance the sensitivity of solid-state NMR experiments on a wide range of systems, including synthetic polymers, owing to the transfer of electron spin polarization from radicals to nuclei upon microwave irradiation (usually at cryogenic temperatures). Provided that the radicals are homogeneously dispersed in the sample, a uniform DNP enhancement is expected for all the signals in the 13C cross-polarization magic angle spinning (CPMAS) spectrum. Here, we show that, in the case of methyl group containing polymers, a change in the cross-polarization (CP) dynamics induced by the moderate increase in sample temperature due to microwave irradiation may lead to the observation of apparent nonuniform enhancements in the DNP-enhanced 13C CPMAS spectra. This peculiar behavior should be accounted for when measuring 13C CP DNP enhancements on polymer materials, especially for heterogeneous polymer samples (for which truly nonuniform DNP enhancements could potentially be detected), or when quantitative results are sought.
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Affiliation(s)
- Giulia Mollica
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Dao Le
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Fabio Ziarelli
- Aix Marseille Université, Centrale Marseille,
CNRS, Fédération des Sciences Chimiques de Marseille
FR 1739, 13397 Marseille, France
| | - Gilles Casano
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Olivier Ouari
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Trang N. T. Phan
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | | | - Pierre Thureau
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Didier Gigmes
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Paul Tordo
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Stéphane Viel
- Aix Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
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28
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Hardy M, Poulhés F, Rizzato E, Rockenbauer A, Banaszak K, Karoui H, Lopez M, Zielonka J, Vasquez-Vivar J, Sethumadhavan S, Kalyanaraman B, Tordo P, Ouari O. Mitochondria-targeted spin traps: synthesis, superoxide spin trapping, and mitochondrial uptake. Chem Res Toxicol 2014; 27:1155-65. [PMID: 24890552 DOI: 10.1021/tx500032e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Development of reliable methods and site-specific detection of free radicals is an active area of research. Here, we describe the synthesis and radical-trapping properties of new derivatives of DEPMPO and DIPPMPO, bearing a mitochondria-targeting triphenylphosphonium cationic moiety or guanidinium cationic group. All of the spin traps prepared have been observed to efficiently trap superoxide radical anions in a cell-free system. The superoxide spin adducts exhibited similar spectral properties, indicating no significant differences in the geometry of the cyclic nitroxide moieties of the spin adducts. The superoxide adduct stability was measured and observed to be highest (t1/2 = 73 min) for DIPPMPO nitrone linked to triphenylphosphonium moiety via a short carbon chain (Mito-DIPPMPO). The experimental results and DFT quantum chemical calculations indicate that the cationic property of the triphenylphosphonium group may be responsible for increased superoxide trapping efficiency and adduct stability of Mito-DIPPMPO, as compared to the DIPPMPO spin trap. The studies of uptake of the synthesized traps into isolated mitochondria indicated the importance of both cationic and lipophilic properties, with the DEPMPO nitrone linked to the triphenylphosphonium moiety via a long carbon chain (Mito10-DEPMPO) exhibiting the highest mitochondrial uptake. We conclude that, of the synthesized traps, Mito-DIPPMPO and Mito10-DEPMPO are the best candidates for potential mitochondria-specific spin traps for use in biologically relevant systems.
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Affiliation(s)
- Micael Hardy
- Aix Marseille Université , CNRS, ICR UMR 7273, 13397 Marseille, France
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29
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Le D, Casano G, Phan TNT, Ziarelli F, Ouari O, Aussenac F, Thureau P, Mollica G, Gigmes D, Tordo P, Viel S. Optimizing Sample Preparation Methods for Dynamic Nuclear Polarization Solid-state NMR of Synthetic Polymers. Macromolecules 2014. [DOI: 10.1021/ma500788n] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Dao Le
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Gilles Casano
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Trang N. T. Phan
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Fabio Ziarelli
- Aix Marseille Université, CNRS, Centrale Marseille, Fédération
des Sciences Chimiques de Marseille FR 1739, 13397, Marseille, France
| | - Olivier Ouari
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | | | - Pierre Thureau
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Giulia Mollica
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Didier Gigmes
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Paul Tordo
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
| | - Stéphane Viel
- Aix Marseille Université, CNRS,
ICR UMR 7273, 13397, Marseille, France
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30
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Abbas K, Hardy M, Poulhès F, Karoui H, Tordo P, Ouari O, Peyrot F. Detection of superoxide production in stimulated and unstimulated living cells using new cyclic nitrone spin traps. Free Radic Biol Med 2014; 71:281-290. [PMID: 24662195 DOI: 10.1016/j.freeradbiomed.2014.03.019] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 03/11/2014] [Accepted: 03/17/2014] [Indexed: 10/25/2022]
Abstract
Reactive oxygen species (ROS), including superoxide anion and hydrogen peroxide (H2O2), have a diverse array of physiological and pathological effects within living cells depending on the extent, timing, and location of their production. For measuring ROS production in cells, the ESR spin trapping technique using cyclic nitrones distinguishes itself from other methods by its specificity for superoxide and hydroxyl radical. However, several drawbacks, such as the low spin trapping rate and the spontaneous and cell-enhanced decomposition of the spin adducts to ESR-silent products, limit the application of this method to biological systems. Recently, new cyclic nitrones bearing a triphenylphosphonium (Mito-DIPPMPO) or a permethylated β-cyclodextrin moiety (CD-DIPPMPO) have been synthesized and their spin adducts demonstrated increased stability in buffer. In this study, a comparison of the spin trapping efficiency of these new compounds with commonly used cyclic nitrone spin traps, i.e., 5,5-dimethyl-1-pyrroline N-oxide (DMPO), and analogs BMPO, DEPMPO, and DIPPMPO, was performed on RAW 264.7 macrophages stimulated with phorbol 12-myristate 13-acetate. Our results show that Mito-DIPPMPO and CD-DIPPMPO enable a higher detection of superoxide adduct, with a low (if any) amount of hydroxyl adduct. CD-DIPPMPO, especially, appears to be a superior spin trap for extracellular superoxide detection in living macrophages, allowing measurement of superoxide production in unstimulated cells for the first time. The main rationale put forward for this extreme sensitivity is that the extracellular localization of the spin trap prevents the reduction of the spin adducts by ascorbic acid and glutathione within cells.
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Affiliation(s)
- Kahina Abbas
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, Sorbonne Paris Cité, 75006 Paris, France
| | - Micael Hardy
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Florent Poulhès
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Fabienne Peyrot
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, Sorbonne Paris Cité, 75006 Paris, France; ESPE de l׳Académie de Paris, Université Paris Sorbonne, 75016 Paris, France.
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31
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Karoui H, Nsanzumuhire C, Le Moigne F, Hardy M, Siri D, Derat E, Rockenbauer A, Ouari O, Tordo P. Synthesis and spin-trapping properties of a trifluoromethyl analogue of DMPO: 5-methyl-5-trifluoromethyl-1-pyrroline N-oxide (5-TFDMPO). Chemistry 2014; 20:4064-71. [PMID: 24590621 DOI: 10.1002/chem.201303774] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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: 09/26/2013] [Indexed: 11/05/2022]
Abstract
The 5-diethoxyphosphonyl-5-methyl-1-pyrroline N-oxide superoxide spin adduct (DEPMPO-OOH) is much more persistent (about 15 times) than the 5,5-dimethyl-1-pyrroline N-oxide superoxide spin adduct (DMPO-OOH). The diethoxyphosphonyl group is bulkier than the methyl group and its electron-withdrawing effect is much stronger. These two factors could play a role in explaining the different half-lifetimes of DMPO-OOH and DEPMPO-OOH. The trifluoromethyl and the diethoxyphosphonyl groups show similar electron-withdrawing effects but have different sizes. We have thus synthesized and studied 5-methyl-5-trifluoromethyl-1-pyrroline N-oxide (5-TFDMPO), a new trifluoromethyl analogue of DMPO, to compare its spin-trapping performance with those of DMPO and DEPMPO. 5-TFDMPO was prepared in a five-step sequence by means of the Zn/AcOH reductive cyclization of 5,5,5-trifluoro-4-methyl-4-nitropentanal, and the geometry of the molecule was estimated by using DFT calculations. The spin-trapping properties were investigated both in toluene and in aqueous buffer solutions for oxygen-, sulfur-, and carbon-centered radicals. All the spin adducts exhibit slightly different fluorine hyperfine coupling constants, thereby suggesting a hindered rotation of the trifluoromethyl group, which was confirmed by variable-temperature EPR studies and DFT calculations. In phosphate buffer at pH 7.4, the half-life of 5-TFDMPOOOH is about three times shorter than for DEPMPO-OOH and five times longer than for DMPO-OOH. Our results suggest that the stabilization of the superoxide adducts comes from a delicate balance between steric, electronic, and hydrogen-bonding effects that involve the β group, the hydroperoxyl moiety, and the nitroxide.
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Affiliation(s)
- Hakim Karoui
- Aix-Marseille Université, CNRS UMR7273, Institut de Chimie Radicalaire (ICR), Case 521, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20 (France), Fax: (+33) 491-288-758
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32
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Bézière N, Hardy M, Poulhès F, Karoui H, Tordo P, Ouari O, Frapart YM, Rockenbauer A, Boucher JL, Mansuy D, Peyrot F. Metabolic stability of superoxide adducts derived from newly developed cyclic nitrone spin traps. Free Radic Biol Med 2014; 67:150-8. [PMID: 24161442 DOI: 10.1016/j.freeradbiomed.2013.10.812] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2013] [Revised: 09/20/2013] [Accepted: 10/16/2013] [Indexed: 11/24/2022]
Abstract
Reactive oxygen species are by-products of aerobic metabolism involved in the onset and evolution of various pathological conditions. Among them, the superoxide radical is of special interest as the origin of several damaging species such as H2O2, hydroxyl radical, or peroxynitrite (ONOO(-)). Spin trapping coupled with ESR is a method of choice to characterize these species in chemical and biological systems and the metabolic stability of the spin adducts derived from reaction of superoxide and hydroxyl radicals with nitrones is the main limit to the in vivo application of the method. Recently, new cyclic nitrones bearing a triphenylphosphonium or permethylated β-cyclodextrin moiety have been synthesized and their spin adducts demonstrated increased stability in buffer. In this article, we studied the stability of the superoxide adducts of four new cyclic nitrones in the presence of liver subcellular fractions and biologically relevant reductants using an original setup combining a stopped-flow device and an ESR spectrometer. The kinetics of disappearance of the spin adducts were analyzed using an appropriate simulation program. Our results highlight the interest of the new spin trapping agents CD-DEPMPO and CD-DIPPMPO for specific detection of superoxide with high stability of the superoxide adducts in the presence of liver microsomes.
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Affiliation(s)
- Nicolas Bézière
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Micael Hardy
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Florent Poulhès
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Hakim Karoui
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Olivier Ouari
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille Cedex 20, France
| | - Yves-Michel Frapart
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Antal Rockenbauer
- Institute of Molecular Pharmacology, Research Centre for Natural Sciences, Budapest, Hungary
| | - Jean-Luc Boucher
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Daniel Mansuy
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France
| | - Fabienne Peyrot
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques (UMR CNRS 8601), Université Paris Descartes, 75006 Paris, France; IUFM de Paris, Université Paris Sorbonne, 75016 Paris, France.
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33
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Abstract
Average geometries of the nitroxide adducts of various radicals with three substituted DEPMPO nitrones allow the prediction of a correlation between the substitution and the trapping properties.
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Affiliation(s)
- Florence Chalier
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Jean-Louis Clément
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Micaël Hardy
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Paul Tordo
- Laboratoire SREP
- Institut de Chimie Radicalaire – UMR 7273
- CNRS and Aix-Marseille Univ. – case 521
- Centre de Saint Jérôme
- , France
| | - Antal Rockenbauer
- Research Centre for Natural Sciences
- Institute for Molecular Pharmacology
- H-1525 Budapest, Hungary
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34
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Lelli M, Rossini AJ, Casano G, Ouari O, Tordo P, Lesage A, Emsley L. Hydrophobic radicals embedded in neutral surfactants for dynamic nuclear polarization of aqueous environments at 9.4 Tesla. Chem Commun (Camb) 2014; 50:10198-201. [DOI: 10.1039/c4cc02152e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Large DNP enhancements of NMR signals are demonstrated from hydrophobic radicals solubilised in aqueous environments by biologically compatible neutral amphiphiles.
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Affiliation(s)
- Moreno Lelli
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
| | - Aaron J. Rossini
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
| | - Gilles Casano
- Aix-Marseille Université
- CNRS, ICR UMR 7273
- 13397 Marseille, France
| | - Olivier Ouari
- Aix-Marseille Université
- CNRS, ICR UMR 7273
- 13397 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université
- CNRS, ICR UMR 7273
- 13397 Marseille, France
| | - Anne Lesage
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
| | - Lyndon Emsley
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
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35
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Salnikov ES, Glattard E, Sarrouj H, Marquette A, Aisenbrey C, Ouari O, Tordo P, Engelke F, Aussenac F, Bechinger B. Lipid-Mediated Polypeptide Interactions in Membranes: Case Study on the Synergism Between Linear Cationic Antimicrobial Peptides. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.2483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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36
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Conley MP, Rossini AJ, Comas-Vives A, Valla M, Casano G, Ouari O, Tordo P, Lesage A, Emsley L, Copéret C. Silica-surface reorganization during organotin grafting evidenced by 119Sn DNP SENS: a tandem reaction of gem-silanols and strained siloxane bridges. Phys Chem Chem Phys 2014; 16:17822-7. [DOI: 10.1039/c4cp01973c] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [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
Bu3Sn(allyl) reacts with Q2-geminal disilanols and strained siloxane bridges of partially dehydroxylated silica to yield bipodal species through surface rearrangement.
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Affiliation(s)
- Matthew P. Conley
- Department of Chemistry and Applied Biosciences
- CH-8093 Zürich, Switzerland
| | - Aaron J. Rossini
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
| | - Aleix Comas-Vives
- Department of Chemistry and Applied Biosciences
- CH-8093 Zürich, Switzerland
| | - Maxence Valla
- Department of Chemistry and Applied Biosciences
- CH-8093 Zürich, Switzerland
| | - Gilles Casano
- Aix-Marseille Université
- CNRS
- ICR UMR 7273
- 13397 Marseille Cedex 20, France
| | - Olivier Ouari
- Aix-Marseille Université
- CNRS
- ICR UMR 7273
- 13397 Marseille Cedex 20, France
| | - Paul Tordo
- Aix-Marseille Université
- CNRS
- ICR UMR 7273
- 13397 Marseille Cedex 20, France
| | - Anne Lesage
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
| | - Lyndon Emsley
- Centre de RMN à Trés Hauts Champs
- Institut de Sciences Analytiques (CNRS/ENS Lyon/UCB Lyon 1)
- Université de Lyon
- 69100 Villeurbanne, France
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences
- CH-8093 Zürich, Switzerland
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37
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Mao J, Akhmetzyanov D, Ouari O, Denysenkov V, Corzilius B, Plackmeyer J, Tordo P, Prisner TF, Glaubitz C. Host-guest complexes as water-soluble high-performance DNP polarizing agents. J Am Chem Soc 2013; 135:19275-81. [PMID: 24279469 DOI: 10.1021/ja409840y] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dynamic nuclear polarization (DNP) enhances the sensitivity of solid-state NMR (SSNMR) spectroscopy by orders of magnitude and, therefore, opens possibilities for novel applications from biology to materials science. This multitude of opportunities implicates a need for high-performance polarizing agents, which integrate specific physical and chemical features tailored for various applications. Here, we demonstrate that for the biradical bTbK in complex with captisol (CAP), a β-cyclodextrin derivative, host-guest assembling offers a new and easily accessible approach for the development of new polarizing agents. In contrast to bTbK, the CAP-bTbK complex is water-soluble and shows significantly improved DNP performance compared to the commonly used DNP agent TOTAPOL. Furthermore, NMR and EPR data reveal improved electron and nuclear spin relaxation properties for bTbK within the host molecule. The numerous possibilities to functionalize host molecules will permit designing novel radical complexes targeting diverse applications.
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Affiliation(s)
- Jiafei Mao
- Institutes of Biophysical Chemistry, ‡Physical and Theoretical Chemistry and §Center for Biomolecular Magnetic Resonance BMRZ, Goethe University Frankfurt , 60438 Frankfurt/M., Germany
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38
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Cheng T, Mishkovsky M, Bastiaansen JAM, Ouari O, Hautle P, Tordo P, van den Brandt B, Comment A. Automated transfer and injection of hyperpolarized molecules with polarization measurement prior to in vivo NMR. NMR Biomed 2013; 26:1582-1588. [PMID: 23893539 DOI: 10.1002/nbm.2993] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 06/05/2013] [Accepted: 06/05/2013] [Indexed: 06/02/2023]
Abstract
Hyperpolarized magnetic resonance via dissolution dynamic nuclear polarization necessitates the transfer of the hyperpolarized molecules from the polarizer to the imager prior to in vivo measurements. This process leads to unavoidable losses in nuclear polarization, which are difficult to evaluate once the solution has been injected into an animal. We propose a method to measure the polarization of the hyperpolarized molecules inside the imager bore, 3 s following dissolution, at the time of the injection, using a precise quantification of the infusate concentration. This in situ quantification allows for distinguishing between signal modulations related to variations in the nuclear polarization at the time of the injection and signal modulations related to physiological processes such as tissue perfusion. In addition, our method includes a radical scavenging process that leads to a minor reduction in sample concentration and takes place within a couple of seconds following the dissolution in order to minimize the losses due to the presence of paramagnetic polarizing agent in the infusate. We showed that proton exchange between vitamin C, the scavenging molecule and the deuterated solvent shortens the long carboxyl (13)C longitudinal relaxation time in [1-(13)C]acetate. This additional source of dipolar relaxation can be avoided by using deuterated ascorbate. Overall, the method allows for a substantial gain in polarization and also leads to an extension of the time window available for in vivo measurements.
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Affiliation(s)
- Tian Cheng
- Institute of Physics of Biological System, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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39
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Sauvée C, Rosay M, Casano G, Aussenac F, Weber RT, Ouari O, Tordo P. Rücktitelbild: Highly Efficient, Water-Soluble Polarizing Agents for Dynamic Nuclear Polarization at High Frequency (Angew. Chem. 41/2013). Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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40
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Sauvée C, Rosay M, Casano G, Aussenac F, Weber RT, Ouari O, Tordo P. Back Cover: Highly Efficient, Water-Soluble Polarizing Agents for Dynamic Nuclear Polarization at High Frequency (Angew. Chem. Int. Ed. 41/2013). Angew Chem Int Ed Engl 2013. [DOI: 10.1002/anie.201307407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Gajan D, Schwarzwälder M, Conley MP, Grüning WR, Rossini AJ, Zagdoun A, Lelli M, Yulikov M, Jeschke G, Sauvée C, Ouari O, Tordo P, Veyre L, Lesage A, Thieuleux C, Emsley L, Copéret C. Solid-phase polarization matrixes for dynamic nuclear polarization from homogeneously distributed radicals in mesostructured hybrid silica materials. J Am Chem Soc 2013; 135:15459-66. [PMID: 23978152 DOI: 10.1021/ja405822h] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Mesoporous hybrid silica-organic materials containing homogeneously distributed stable mono- or dinitroxide radicals covalently bound to the silica surface were developed as polarization matrixes for solid-state dynamic nuclear polarization (DNP) NMR experiments. For TEMPO-containing materials impregnated with water or 1,1,2,2-tetrachloroethane, enhancement factors of up to 36 were obtained at ∼100 K and 9.4 T without the need for a glass-forming additive. We show that the homogeneous radical distribution and the subtle balance between the concentration of radical in the material and the fraction of radicals at a sufficient inter-radical distance to promote the cross-effect are the main determinants for the DNP enhancements we obtain. The material, as well as an analogue containing the poorly soluble biradical bTUrea, is used as a polarizing matrix for DNP NMR experiments of solutions containing alanine and pyruvic acid. The analyte is separated from the polarization matrix by simple filtration.
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Affiliation(s)
- David Gajan
- Department of Chemistry, ETH Zürich , CH-8093 Zürich, Switzerland
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42
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Bardelang D, Giorgi M, Pardanaud C, Hornebecq V, Rizzato E, Tordo P, Ouari O. Organic multishell isostructural host-guest crystals: fullerenes C(60) inside a nitroxide open framework. Chem Commun (Camb) 2013; 49:3519-21. [PMID: 23511773 DOI: 10.1039/c3cc00170a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The dinitroxide biradical crystallizes forming hexagonal open frameworks with one-dimensional corrugated channels filled with crystallization solvent. The large pockets constitutive of the channels allowed the inclusion of C(60) in the paramagnetic network. The rapidity and high fidelity of crystal growth were used to prepare isostructural multilayer host-guest crystals successively stained with C(60).
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Affiliation(s)
- David Bardelang
- Aix-Marseille Université, CNRS, Institut de Chimie Radicalaire, UMR 7273, 13013 Marseille, France.
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43
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Zagdoun A, Casano G, Ouari O, Schwarzwälder M, Rossini AJ, Aussenac F, Yulikov M, Jeschke G, Copéret C, Lesage A, Tordo P, Emsley L. Large molecular weight nitroxide biradicals providing efficient dynamic nuclear polarization at temperatures up to 200 K. J Am Chem Soc 2013; 135:12790-7. [PMID: 23961876 DOI: 10.1021/ja405813t] [Citation(s) in RCA: 271] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A series of seven functionalized nitroxide biradicals (the bTbK biradical and six derivatives) are investigated as exogenous polarization sources for dynamic nuclear polarization (DNP) solid-state NMR at 9.4 T and with ca. 100 K sample temperatures. The impact of electron relaxation times on the DNP enhancement (ε) is examined, and we observe that longer inversion recovery and phase memory relaxation times provide larger ε. All radicals are tested in both bulk 1,1,2,2-tetrachloroethane solutions and in mesoporous materials, and the difference in ε between the two cases is discussed. The impact of the sample temperature and magic angle spinning frequency on ε is investigated for several radicals each characterized by a range of electron relaxation times. In particular, TEKPol, a bulky derivative of bTbK with a molecular weight of 905 g·mol(-1), is presented. Its high-saturation factor makes it a very efficient polarizing agent for DNP, yielding unprecedented proton enhancements of over 200 in both bulk and materials samples at 9.4 T and 100 K. TEKPol also yields encouraging enhancements of 33 at 180 K and 12 at 200 K, suggesting that with the continued improvement of radicals large ε may be obtained at higher temperatures.
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Affiliation(s)
- Alexandre Zagdoun
- Centre de RMN à Très Hauts Champs, Institut de Sciences Analytiques, Université de Lyon (CNRS/ENS Lyon/UCB Lyon 1), 69100 Villeurbanne, France
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44
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Ouari O, Phan T, Ziarelli F, Casano G, Aussenac F, Thureau P, Gigmes D, Tordo P, Viel S. Improved Structural Elucidation of Synthetic Polymers by Dynamic Nuclear Polarization Solid-State NMR Spectroscopy. ACS Macro Lett 2013; 2:715-719. [PMID: 35606957 DOI: 10.1021/mz4003003] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dynamic nuclear polarization (DNP) is shown to greatly improve the solid-state nuclear magnetic resonance (SSNMR) analysis of synthetic polymers by allowing structural assignment of intrinsically diluted NMR signals, which are typically not detected in conventional SSNMR. Specifically, SSNMR and DNP SSNMR were comparatively used to study functional polymers for which precise structural elucidation of chain ends is essential to control their reactivity and to eventually obtain advanced polymeric materials of complex architecture. Results show that the polymer chain-end signals, while hardly observable in conventional SSNMR, could be clearly identified in the DNP SSNMR spectrum owing to the increase in sensitivity afforded by the DNP setup (a factor ∼10 was achieved here), hence providing access to detailed structural characterization within realistic experimental times. This sizable gain in sensitivity opens new avenues for the characterization of "smart" functional polymeric materials and new analytical perspectives in polymer science.
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Affiliation(s)
- Olivier Ouari
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
| | - Trang Phan
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
| | - Fabio Ziarelli
- Aix-Marseille Université-CNRS, Fédération des Sciences Chimiques de Marseille (FR 1739), 13013 Marseille, France
| | - Gilles Casano
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
| | | | - Pierre Thureau
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
| | - Didier Gigmes
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
| | - Paul Tordo
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
| | - Stéphane Viel
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire (UMR 7273), 13013 Marseille,
France
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45
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Conley MP, Drost RM, Baffert M, Gajan D, Elsevier C, Franks WT, Oschkinat H, Veyre L, Zagdoun A, Rossini A, Lelli M, Lesage A, Casano G, Ouari O, Tordo P, Emsley L, Copéret C, Thieuleux C. A Well-Defined Pd Hybrid Material for theZ-Selective Semihydrogenation of Alkynes Characterized at the Molecular Level by DNP SENS. Chemistry 2013; 19:12234-8. [DOI: 10.1002/chem.201302484] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Indexed: 11/11/2022]
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46
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Sauvée C, Rosay M, Casano G, Aussenac F, Weber RT, Ouari O, Tordo P. Highly efficient, water-soluble polarizing agents for dynamic nuclear polarization at high frequency. Angew Chem Int Ed Engl 2013; 52:10858-61. [PMID: 23956072 DOI: 10.1002/anie.201304657] [Citation(s) in RCA: 324] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Claire Sauvée
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille cedex 20 (France) http://sites.univ-provence.fr/srep/
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47
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Mileo E, Etienne E, Martinho M, Lebrun R, Roubaud V, Tordo P, Gontero B, Guigliarelli B, Marque SRA, Belle V. Enlarging the Panoply of Site-Directed Spin Labeling Electron Paramagnetic Resonance (SDSL-EPR): Sensitive and Selective Spin-Labeling of Tyrosine Using an Isoindoline-Based Nitroxide. Bioconjug Chem 2013; 24:1110-7. [DOI: 10.1021/bc4000542] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elisabetta Mileo
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, 13402 Marseille Cedex
20, France
| | - Emilien Etienne
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, 13402 Marseille Cedex
20, France
| | - Marlène Martinho
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, 13402 Marseille Cedex
20, France
| | - Régine Lebrun
- Aix-Marseille Université, Plate-forme Protéomique
IMM, 31 chemin J. Aiguier, 13402 Marseille Cedex 20, France
| | - Valérie Roubaud
- Aix-Marseille Université, CNRS, ICR UMR 7273, Avenue Escadrille
Normandie-Niemen, 13397 Marseille Cedex 20, France
| | - Paul Tordo
- Aix-Marseille Université, CNRS, ICR UMR 7273, Avenue Escadrille
Normandie-Niemen, 13397 Marseille Cedex 20, France
| | - Brigitte Gontero
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, 13402 Marseille Cedex
20, France
| | - Bruno Guigliarelli
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, 13402 Marseille Cedex
20, France
| | - Sylvain R. A. Marque
- Aix-Marseille Université, CNRS, ICR UMR 7273, Avenue Escadrille
Normandie-Niemen, 13397 Marseille Cedex 20, France
| | - Valérie Belle
- Aix-Marseille Université, CNRS, BIP UMR 7281, 31 chemin J. Aiguier, 13402 Marseille Cedex
20, France
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48
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Houriez C, Ferré N, Siri D, Tordo P, Masella M. Assessing the accuracy of a QM/MM//MD combined protocol to compute spectromagnetic properties of polyfunctional nitroxides in solution. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1240-9] [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: 10/28/2022]
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49
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Coulaud E, Hagebaum-Reignier D, Siri D, Tordo P, Ferré N. Magnetic exchange coupling in bis-nitroxides: a theoretical analysis of the solvent effects. Phys Chem Chem Phys 2012; 14:5504-11. [PMID: 22410818 DOI: 10.1039/c2cp23845d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Magnetic properties of nitroxide radicals can be greatly affected by solvent effects. In this study, the change of the magnetic exchange interaction J, coupling the two unpaired electrons of a model solvated antiferromagnetic bis-iminyl-nitroxide molecule (2IN), is rationalized thanks to different geometric and electronic criteria provided by density functional theory calculations. It is shown that for a given geometry, simple tools can be used to analyze with good accuracy the dependence of J with the solvent polarity. Estimates of two important magnetic parameters are given: the magnetic orbitals exchange and the in-site energy gap between ionic and neutral configurations. 2IN can be engaged in different hydrogen-bonds with first shell water molecules, modifying both the 2IN geometry and the electrostatic potential felt by the molecule. In all, the additivity of electrostatic and hydrogen-bond solvent effects is found to be responsible for J variations as large as 50%.
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Affiliation(s)
- Esther Coulaud
- Aix-Marseille Université, Institut de Chimie Radicalaire, Marseille, France
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50
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Dane EL, Corzilius B, Rizzato E, Stocker P, Maly T, Smith AA, Griffin RG, Ouari O, Tordo P, Swager TM. Rigid orthogonal bis-TEMPO biradicals with improved solubility for dynamic nuclear polarization. J Org Chem 2012; 77:1789-97. [PMID: 22304384 DOI: 10.1021/jo202349j] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis and characterization of oxidized bis-thioketal-trispiro dinitroxide biradicals that orient the nitroxides in a rigid, approximately orthogonal geometry are reported. The biradicals show better performance as polarizing agents in dynamic nuclear polarization (DNP) NMR experiments as compared to biradicals lacking the constrained geometry. In addition, the biradicals display improved solubility in aqueous media due to the presence of polar sulfoxides. The results suggest that the orientation of the radicals is not dramatically affected by the oxidation state of the sulfur atoms in the biradical, and we conclude that a biradical polarizing agent containing a mixture of oxidation states can be used for improved solubility without a loss in performance.
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Affiliation(s)
- Eric L Dane
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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