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Mascali FC, Ching HYV, Rasia RM, Un S, Tabares LC. Using Genetically Encodable Self-Assembling GdIIISpin Labels To Make In-Cell Nanometric Distance Measurements. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201603653] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Florencia C. Mascali
- Instituto de Biología Molecular y Celular de Rosario; Área Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas; Universidad Nacional de Rosario, Ocampo y Esmeralda; Rosario 2000 Argentina
| | - H. Y. Vincent Ching
- Institut de Biologie Intégrative de la Cellule (I2BC); IBITECS, CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay; F-91198 Gif-sur-Yvette France
| | - Rodolfo M. Rasia
- Instituto de Biología Molecular y Celular de Rosario; Área Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas; Universidad Nacional de Rosario, Ocampo y Esmeralda; Rosario 2000 Argentina
| | - Sun Un
- Institut de Biologie Intégrative de la Cellule (I2BC); IBITECS, CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay; F-91198 Gif-sur-Yvette France
| | - Leandro C. Tabares
- Institut de Biologie Intégrative de la Cellule (I2BC); IBITECS, CEA, CNRS, Univ. Paris Sud, Université Paris-Saclay; F-91198 Gif-sur-Yvette France
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102
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Haugland MM, El-Sagheer AH, Porter RJ, Peña J, Brown T, Anderson EA, Lovett JE. 2'-Alkynylnucleotides: A Sequence- and Spin Label-Flexible Strategy for EPR Spectroscopy in DNA. J Am Chem Soc 2016; 138:9069-72. [PMID: 27409454 DOI: 10.1021/jacs.6b05421] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Electron paramagnetic resonance (EPR) spectroscopy is a powerful method to elucidate molecular structure through the measurement of distances between conformationally well-defined spin labels. Here we report a sequence-flexible approach to the synthesis of double spin-labeled DNA duplexes, where 2'-alkynylnucleosides are incorporated at terminal and internal positions on complementary strands. Post-DNA synthesis copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions with a variety of spin labels enable the use of double electron-electron resonance experiments to measure a number of distances on the duplex, affording a high level of detailed structural information.
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Affiliation(s)
- Marius M Haugland
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Oxford, OX1 3TA, U.K
| | - Afaf H El-Sagheer
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Oxford, OX1 3TA, U.K.,Chemistry Branch, Faculty of Petroleum and Mining Engineering, Suez University , Suez 43721, Egypt
| | - Rachel J Porter
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Oxford, OX1 3TA, U.K
| | - Javier Peña
- Departamento de Química Orgánica, Universidad de Salamanca , Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - Tom Brown
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Oxford, OX1 3TA, U.K
| | - Edward A Anderson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Oxford, OX1 3TA, U.K
| | - Janet E Lovett
- SUPA, School of Physics and Astronomy, University of St Andrews , North Haugh, St Andrews, KY16 9SS, U.K
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103
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Hintze C, Bücker D, Domingo Köhler S, Jeschke G, Drescher M. Laser-Induced Magnetic Dipole Spectroscopy. J Phys Chem Lett 2016; 7:2204-9. [PMID: 27163749 DOI: 10.1021/acs.jpclett.6b00765] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Pulse electron paramagnetic resonance measurements of nanometer scale distance distributions have proven highly effective in structural studies. They exploit the magnetic dipole-dipole coupling between spin labels site-specifically attached to macromolecules. The most commonly applied technique is double electron-electron resonance (DEER, also called pulsed electron double resonance (PELDOR)). Here we present the new technique of laser-induced magnetic dipole (LaserIMD) spectroscopy based on optical switching of the dipole-dipole coupling. In a proof of concept experiment on a model peptide, we find, already at a low quantum yield of triplet excitation, the same sensitivity for measuring the distance between a porphyrin and a nitroxide label as in a DEER measurement between two nitroxide labels. On the heme protein cytochrome C, we demonstrate that LaserIMD allows for distance measurements between a heme prosthetic group and a nitroxide label, although the heme triplet state is not directly observable by an electron spin echo.
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Affiliation(s)
- Christian Hintze
- Department of Chemistry, University of Konstanz , 78464 Konstanz, Germany
| | - Dennis Bücker
- Department of Chemistry, University of Konstanz , 78464 Konstanz, Germany
| | | | - Gunnar Jeschke
- Laboratory of Physical Chemistry, Eidgenössische Technische Hochschule Zürich , 8093 Zürich, Switzerland
| | - Malte Drescher
- Department of Chemistry, University of Konstanz , 78464 Konstanz, Germany
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104
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Kuzhelev AA, Strizhakov RK, Krumkacheva OA, Polienko YF, Morozov DA, Shevelev GY, Pyshnyi DV, Kirilyuk IA, Fedin MV, Bagryanskaya EG. Room-temperature electron spin relaxation of nitroxides immobilized in trehalose: Effect of substituents adjacent to NO-group. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 266:1-7. [PMID: 26987109 DOI: 10.1016/j.jmr.2016.02.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 02/04/2016] [Accepted: 02/29/2016] [Indexed: 05/24/2023]
Abstract
Trehalose has been recently promoted as efficient immobilizer of biomolecules for room-temperature EPR studies, including distance measurements between attached nitroxide spin labels. Generally, the structure of nitroxide influences the electron spin relaxation times, being crucial parameters for room-temperature pulse EPR measurements. Therefore, in this work we investigated a series of nitroxides with different substituents adjacent to NO-moiety including spirocyclohexane, spirocyclopentane, tetraethyl and tetramethyl groups. Electron spin relaxation times (T1, Tm) of these radicals immobilized in trehalose were measured at room temperature at X- and Q-bands (9/34GHz). In addition, a comparison was made with the corresponding relaxation times in nitroxide-labeled DNA immobilized in trehalose. In all cases phase memory times Tm were close to 700ns and did not essentially depend on structure of substituents. Comparison of temperature dependences of Tm at T=80-300K shows that the benefit of spirocyclohexane substituents well-known at medium temperatures (∼100-180K) becomes negligible at 300K. Therefore, unless there are specific interactions between spin labels and biomolecules, the room-temperature value of Tm in trehalose is weakly dependent on the structure of substituents adjacent to NO-moiety of nitroxide. The issues of specific interactions and stability of nitroxide labels in biological media might be more important for room temperature pulsed dipolar EPR than differences in intrinsic spin relaxation of radicals.
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Affiliation(s)
- Andrey A Kuzhelev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentiev ave. 9, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
| | - Rodion K Strizhakov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentiev ave. 9, Novosibirsk 630090, Russia; International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia
| | - Olesya A Krumkacheva
- International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
| | - Yuliya F Polienko
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentiev ave. 9, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
| | - Denis A Morozov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentiev ave. 9, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
| | - Georgiy Yu Shevelev
- Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia; Institute of Chemical Biology and Fundamental Medicine, SB RAS, Novosibirsk 630090, Russia
| | - Dmitrii V Pyshnyi
- Institute of Chemical Biology and Fundamental Medicine, SB RAS, Novosibirsk 630090, Russia
| | - Igor A Kirilyuk
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentiev ave. 9, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
| | - Matvey V Fedin
- International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia.
| | - Elena G Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Lavrentiev ave. 9, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia.
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105
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Demay-Drouhard P, Ching HYV, Akhmetzyanov D, Guillot R, Tabares LC, Bertrand HC, Policar C. A Bis-Manganese(II)-DOTA Complex for Pulsed Dipolar Spectroscopy. Chemphyschem 2016; 17:2066-78. [DOI: 10.1002/cphc.201600234] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Paul Demay-Drouhard
- Ecole Normale Supérieure-PSL Research University; Département de Chimie, Sorbonne Universités-UPMC Univ Paris 06; CNRS UMR 7203 LBM; 24 rue Lhomond 75005 Paris France
| | - H. Y. Vincent Ching
- Institute for Integrative Biology of the Cell (I2BC); Department of Biochemistry, Biophysics and Structural Biology; Université Paris-Saclay, CEA, CNRS UMR 9198; Gif-sur-Yvette F-91198 France
| | - Dmitry Akhmetzyanov
- Goethe-University Frankfurt am Main; Institute of Physical and Theoretical Chemistry and; Center for Biomolecular Magnetic Resonance; Max von Laue Str. 7 60438 Frankfurt am Main Germany
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux O'Orsay; Université Paris-Sud, UMR CNRS 8182, Université Paris-Saclay; 91405 Orsay France
| | - Leandro C. Tabares
- Institute for Integrative Biology of the Cell (I2BC); Department of Biochemistry, Biophysics and Structural Biology; Université Paris-Saclay, CEA, CNRS UMR 9198; Gif-sur-Yvette F-91198 France
| | - Hélène C. Bertrand
- Ecole Normale Supérieure-PSL Research University; Département de Chimie, Sorbonne Universités-UPMC Univ Paris 06; CNRS UMR 7203 LBM; 24 rue Lhomond 75005 Paris France
| | - Clotilde Policar
- Ecole Normale Supérieure-PSL Research University; Département de Chimie, Sorbonne Universités-UPMC Univ Paris 06; CNRS UMR 7203 LBM; 24 rue Lhomond 75005 Paris France
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106
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Ching HYV, Mascali FC, Bertrand HC, Bruch EM, Demay-Drouhard P, Rasia RM, Policar C, Tabares LC, Un S. The Use of Mn(II) Bound to His-tags as Genetically Encodable Spin-Label for Nanometric Distance Determination in Proteins. J Phys Chem Lett 2016; 7:1072-1076. [PMID: 26938795 DOI: 10.1021/acs.jpclett.6b00362] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A genetically encodable paramagnetic spin-label capable of self-assembly from naturally available components would offer a means for studying the in-cell structure and interactions of a protein by electron paramagnetic resonance (EPR). Here, we demonstrate pulse electron-electron double resonance (DEER) measurements on spin-labels consisting of Mn(II) ions coordinated to a sequence of histidines, so-called His-tags, that are ubiquitously added by genetic engineering to facilitate protein purification. Although the affinity of His-tags for Mn(II) was low (800 μM), Mn(II)-bound His-tags yielded readily detectable DEER time traces even at concentrations expected in cells. We were able to determine accurately the distance between two His-tag Mn(II) spin-labels at the ends of a rigid helical polyproline peptide of known structure, as well as at the ends of a completely cell-synthesized 3-helix bundle. This approach not only greatly simplifies the labeling procedure but also represents a first step towards using self-assembling metal spin-labels for in-cell distance measurements.
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Affiliation(s)
- H Y Vincent Ching
- Institute for Integrative Biology of the Cell (I2BC), Department of Biochemistry, Biophysics and Structural Biology, Université Paris-Saclay, CEA, CNRS UMR 9198 , F-91191 Gif-sur-Yvette, France
| | - Florencia C Mascali
- Instituto de Biología Molecular y Celular de Rosario; Área Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , 2000 Rosario, Argentina
| | - Hélène C Bertrand
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 7203 LBM , F-75005 Paris, France
- CNRS, UMR 7203, Laboratoire des Biomolécules, F-75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7203, Laboratoire des Biomolécules, F-75005 Paris, France
| | - Eduardo M Bruch
- Institute for Integrative Biology of the Cell (I2BC), Department of Biochemistry, Biophysics and Structural Biology, Université Paris-Saclay, CEA, CNRS UMR 9198 , F-91191 Gif-sur-Yvette, France
| | - Paul Demay-Drouhard
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 7203 LBM , F-75005 Paris, France
- CNRS, UMR 7203, Laboratoire des Biomolécules, F-75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7203, Laboratoire des Biomolécules, F-75005 Paris, France
| | - Rodolfo M Rasia
- Instituto de Biología Molecular y Celular de Rosario; Área Biofísica, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario , 2000 Rosario, Argentina
| | - Clotilde Policar
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 7203 LBM , F-75005 Paris, France
- CNRS, UMR 7203, Laboratoire des Biomolécules, F-75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7203, Laboratoire des Biomolécules, F-75005 Paris, France
| | - Leandro C Tabares
- Institute for Integrative Biology of the Cell (I2BC), Department of Biochemistry, Biophysics and Structural Biology, Université Paris-Saclay, CEA, CNRS UMR 9198 , F-91191 Gif-sur-Yvette, France
| | - Sun Un
- Institute for Integrative Biology of the Cell (I2BC), Department of Biochemistry, Biophysics and Structural Biology, Université Paris-Saclay, CEA, CNRS UMR 9198 , F-91191 Gif-sur-Yvette, France
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107
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Prisner T, Denysenkov V, Sezer D. Liquid state DNP at high magnetic fields: Instrumentation, experimental results and atomistic modelling by molecular dynamics simulations. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 264:68-77. [PMID: 26920832 DOI: 10.1016/j.jmr.2015.11.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 11/11/2015] [Accepted: 11/12/2015] [Indexed: 05/14/2023]
Abstract
Dynamic nuclear polarization (DNP) at high magnetic fields has recently become one of the major research areas in magnetic resonance spectroscopy and imaging. Whereas much work has been devoted to experiments where the polarization transfer from the electron spin to the nuclear spin is performed in the solid state, only a few examples exist of experiments where the polarization transfer is performed in the liquid state. Here we describe such experiments at a magnetic field of 9.2 T, corresponding to a nuclear Larmor frequency of 400 MHz for proton spins and an excitation frequency of 263 GHz for the electron spins. The technical requirements to perform such experiments are discussed in the context of the double resonance structures that we have implemented. The experimental steps that allowed access to the enhancement factors for proton spins of several organic solvents with nitroxide radicals as polarizing agents are described. A computational scheme for calculating the coupling factors from molecular dynamics (MD) simulations is outlined and used to highlight the limitations of the classical models based on translational and rotational motion that are typically employed to quantify the observed coupling factors. The ability of MD simulations to predict enhancements for a variety of radicals and solvent molecules at any magnetic field strength should prove useful in optimizing experimental conditions for DNP in the liquid state.
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Affiliation(s)
- Thomas Prisner
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Germany.
| | - Vasyl Denysenkov
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Germany
| | - Deniz Sezer
- Faculty of Engineering and Natural Sciences, Sabancı University, Orhanlı-Tuzla, 34956 Istanbul, Turkey.
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108
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Roser P, Schmidt MJ, Drescher M, Summerer D. Site-directed spin labeling of proteins for distance measurements in vitro and in cells. Org Biomol Chem 2016; 14:5468-76. [DOI: 10.1039/c6ob00473c] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We here review strategies for site-directed spin labeling (SDSL) of proteins and discuss their potential for EPR distance measurements to study protein function in vitro and in cells.
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Affiliation(s)
- P. Roser
- Department of Chemistry
- Zukunftskolleg
- and Konstanz Research School Chemical Biology
- University of Konstanz
- 78457 Konstanz
| | - M. J. Schmidt
- Department of Chemistry
- Zukunftskolleg
- and Konstanz Research School Chemical Biology
- University of Konstanz
- 78457 Konstanz
| | - M. Drescher
- Department of Chemistry
- Zukunftskolleg
- and Konstanz Research School Chemical Biology
- University of Konstanz
- 78457 Konstanz
| | - D. Summerer
- Department of Chemistry and Chemical Biology
- Technical University of Dortmund
- 44227 Dortmund
- Germany
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109
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110
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Bačić G, Pavićević A, Peyrot F. In vivo evaluation of different alterations of redox status by studying pharmacokinetics of nitroxides using magnetic resonance techniques. Redox Biol 2015; 8:226-42. [PMID: 26827126 PMCID: PMC4753396 DOI: 10.1016/j.redox.2015.10.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 10/25/2015] [Indexed: 12/22/2022] Open
Abstract
Free radicals, particularly reactive oxygen species (ROS), are involved in various pathologies, injuries related to radiation, ischemia-reperfusion or ageing. Unfortunately, it is virtually impossible to directly detect free radicals in vivo, but the redox status of the whole organism or particular organ can be studied in vivo by using magnetic resonance techniques (EPR and MRI) and paramagnetic stable free radicals - nitroxides. Here we review results obtained in vivo following the pharmacokinetics of nitroxides on experimental animals (and a few in humans) under various conditions. The focus was on conditions where the redox status has been altered by induced diseases or harmful agents, clearly demonstrating that various EPR/MRI/nitroxide combinations can reliably detect metabolically induced changes in the redox status of organs. These findings can improve our understanding of oxidative stress and provide a basis for studying the effectiveness of interventions aimed to modulate oxidative stress. Also, we anticipate that the in vivo EPR/MRI approach in studying the redox status can play a vital role in the clinical management of various pathologies in the years to come providing the development of adequate equipment and probes.
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Affiliation(s)
- Goran Bačić
- EPR Laboratory, Faculty of Physical Chemistry, University of Belgrade, 11000 Belgrade, Serbia
| | - Aleksandra Pavićević
- EPR Laboratory, Faculty of Physical Chemistry, University of Belgrade, 11000 Belgrade, Serbia
| | - Fabienne Peyrot
- LCBPT, UMR 8601 CNRS - Université Paris Descartes, Sorbonne Paris Cité, 75006 Paris, France; ESPE of Paris, Paris Sorbonne Université, 75016 Paris, France
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111
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Kirilyuk IA, Bobko AA, Semenov SV, Komarov DA, Irtegova IG, Grigor'ev IA, Bagryanskaya E. Effect of Sterical Shielding on the Redox Properties of Imidazoline and Imidazolidine Nitroxides. J Org Chem 2015; 80:9118-25. [PMID: 26302173 DOI: 10.1021/acs.joc.5b01494] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxidant properties of the series of 2,2,5,5-tetraalkyl imidazoline and imidazolidine nitroxides were investigated. An increase in the number of bulky alkyl substituents leads to a decrease in the rate of reduction with ascorbate, which makes the electrochemical reduction potential more negative and shifts the equilibrium in the mixture of nitroxide and reference hydroxylamine (3-carboxy-1-hydroxy-2,2,5,5-tetramethylpyrrolidine-1-oxyl-1-(15)N) toward the starting compounds. The effect of structural factors on these reactions was analyzed by means of multiple regression using the Fujita steric constant Es and the inductive Hammett constant σI. Satisfactory statistical outputs were obtained in all of the biparameter correlations, denoting that the oxidant properties of the nitroxides are determined by steric and electronic effects of the substituents. The data imply that bulky substituents can stabilize nitroxide and/or destabilize hydroxylamine.
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Affiliation(s)
- Igor A Kirilyuk
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Academician Lavrentjev Avenue 9, Novosibirsk, 630090, Russia.,Novosibirsk State University , Pirogova str. 2, Novosibirsk 630090, Russia
| | - Andrey A Bobko
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Internal Medicine, The Ohio State University , Columbus, Ohio 43210, United States
| | - Sergey V Semenov
- Novosibirsk State University , Pirogova str. 2, Novosibirsk 630090, Russia
| | - Denis A Komarov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Academician Lavrentjev Avenue 9, Novosibirsk, 630090, Russia.,Novosibirsk State University , Pirogova str. 2, Novosibirsk 630090, Russia
| | - Irina G Irtegova
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Academician Lavrentjev Avenue 9, Novosibirsk, 630090, Russia.,Novosibirsk State University , Pirogova str. 2, Novosibirsk 630090, Russia
| | - Igor A Grigor'ev
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Academician Lavrentjev Avenue 9, Novosibirsk, 630090, Russia
| | - Elena Bagryanskaya
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Academician Lavrentjev Avenue 9, Novosibirsk, 630090, Russia.,Novosibirsk State University , Pirogova str. 2, Novosibirsk 630090, Russia
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112
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Saha S, Jagtap AP, Sigurdsson ST. Site-Directed Spin Labeling of RNA by Postsynthetic Modification of 2'-Amino Groups. Methods Enzymol 2015; 563:397-414. [PMID: 26478493 DOI: 10.1016/bs.mie.2015.07.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
To elucidate mechanisms that govern functions of nucleic acids, it is essential to understand their structure and dynamics. Electron paramagnetic resonance (EPR) spectroscopy is a valuable technique that is routinely used to study those aspects of nucleic acids. A prerequisite for most EPR studies of nucleic acids is incorporation of spin labels at specific sites, known as site-directed spin labeling (SDSL). There are two main strategies for SDSL through formation of covalent bonds, i.e., the phosphoramidite approach and postsynthetic spin-labeling. After describing briefly the advantages and disadvantages of these two strategies, postsynthetic labeling of 2'-amino groups in RNA is delineated. Postsynthetic labeling of 2'-amino groups in RNA using 4-isocyanato-TEMPO has long been established as a useful approach. However, this method has some drawbacks, both with regard to the spin-labeling protocol and the flexibility of the spin label itself. Recently reported isothiocyanate-substituted aromatic isoindoline-derived nitroxides can be used to quantitatively and selectively modify 2'-amino groups in RNA and do not have the drawbacks associated with 4-isocyanato-TEMPO. This chapter provides a detailed description of the postsynthetic spin-labeling methods of 2'-amino groups in RNA with a special focus on using the aromatic isothiocyanate spin labels.
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Affiliation(s)
- Subham Saha
- Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland
| | - Anil P Jagtap
- Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland
| | - Snorri Th Sigurdsson
- Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland.
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113
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Frank J, Elewa M, Said MM, El Shihawy HA, El-Sadek M, Müller D, Meister A, Hause G, Drescher S, Metz H, Imming P, Mäder K. Synthesis, Characterization, and Nanoencapsulation of Tetrathiatriarylmethyl and Tetrachlorotriarylmethyl (Trityl) Radical Derivatives—A Study To Advance Their Applicability as in Vivo EPR Oxygen Sensors. J Org Chem 2015; 80:6754-66. [PMID: 26020133 DOI: 10.1021/acs.joc.5b00918] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Tissue oxygenation plays an important role in the pathophysiology of various diseases and is often a marker of prognosis and therapeutic response. EPR (ESR) is a suitable noninvasive oximetry technique. However, to reliably deploy soluble EPR probes as oxygen sensors in complex biological systems, there is still a need to investigate and improve their specificity, sensitivity, and stability. We reproducibly synthesized various derivatives of tetrathiatriarylmethyl and tetrachlorotriarylmethyl (trityl) radicals. Hydrophilic radicals were investigated in aqueous solution mimicking physiological conditions by, e.g., variation of viscosity and ionic strength. Their specificity was satisfactory, but the oxygen sensitivity was low. To enhance the capability of trityl radicals as oxygen sensors, encapsulation into oily core nanocapsules was performed. Thus, different lipophilic triesters were prepared and characterized in oily solution employing oils typically used in drug formulations, i.e., middle-chain triglycerides and isopropyl myristate. Our screening identified the deuterated ethyl ester of D-TAM (radical 13) to be suitable. It had an extremely narrow single EPR line under anoxic conditions and excellent oxygen sensitivity. After encapsulation, it retained its oxygen responsiveness and was protected against reduction by ascorbic acid. These biocompatible and highly sensitive nanosensors offer great potential for future EPR oximetry applications in preclinical research.
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Affiliation(s)
- Juliane Frank
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Marwa Elewa
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.,‡Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | - Mohamed M Said
- ‡Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | - Hosam A El Shihawy
- ‡Faculty of Pharmacy, Suez Canal University, P.O. 41522, Ismailia, Egypt
| | | | - Diana Müller
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Annette Meister
- ⊥Center for Structure and Dynamics of Proteins (MZP), Biocenter Martin-Luther-Universität (MLU) Halle-Wittenberg, Weinbergweg 22, 06120 Halle (Saale), Germany
| | - Gerd Hause
- #Biocenter Martin-Luther-Universität (MLU) Halle-Wittenberg, Weinbergweg 22, 06120 Halle (Saale), Germany
| | - Simon Drescher
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Hendrik Metz
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Peter Imming
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
| | - Karsten Mäder
- †Institut für Pharmazie, Martin-Luther-Universität (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany
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114
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Joseph B, Sikora A, Bordignon E, Jeschke G, Cafiso DS, Prisner TF. Distance Measurement on an Endogenous Membrane Transporter in E. coli Cells and Native Membranes Using EPR Spectroscopy. Angew Chem Int Ed Engl 2015; 54:6196-9. [PMID: 25826642 DOI: 10.1002/anie.201501086] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Indexed: 01/21/2023]
Abstract
Membrane proteins may be influenced by the environment, and they may be unstable in detergents or fail to crystallize. As a result, approaches to characterize structures in a native environment are highly desirable. Here, we report a novel general strategy for precise distance measurements on outer membrane proteins in whole Escherichia coli cells and isolated outer membranes. The cobalamin transporter BtuB was overexpressed and spin-labeled in whole cells and outer membranes and interspin distances were measured to a spin-labeled cobalamin using pulse EPR spectroscopy. A comparative analysis of the data reveals a similar interspin distance between whole cells, outer membranes, and synthetic vesicles. This approach provides an elegant way to study conformational changes or protein-protein/ligand interactions at surface-exposed sites of membrane protein complexes in whole cells and native membranes, and provides a method to validate outer membrane protein structures in their native environment.
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Affiliation(s)
- Benesh Joseph
- Institut für physikalische und theoretische Chemie und Biomolekulares Magnetresonanz Zentrum, Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main (Germany) http://www.prisner.de
| | - Arthur Sikora
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville VA22904-4319 (USA)
| | - Enrica Bordignon
- Department of Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin (Germany)
| | - Gunnar Jeschke
- Laboratory for Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zürich (Switzerland)
| | - David S Cafiso
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville VA22904-4319 (USA).
| | - Thomas F Prisner
- Institut für physikalische und theoretische Chemie und Biomolekulares Magnetresonanz Zentrum, Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main (Germany) http://www.prisner.de.
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115
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Joseph B, Sikora A, Bordignon E, Jeschke G, Cafiso DS, Prisner TF. Distance Measurement on an Endogenous Membrane Transporter inE. coliCells and Native Membranes Using EPR Spectroscopy. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501086] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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116
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Vincent Ching HY, Demay-Drouhard P, Bertrand HC, Policar C, Tabares LC, Un S. Nanometric distance measurements between Mn(ii)DOTA centers. Phys Chem Chem Phys 2015; 17:23368-77. [DOI: 10.1039/c5cp03487f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The distance between two Mn(ii)DOTA complexes attached to the ends of polyproline helices of varying lengths was measured by 94 GHz PELDOR spectroscopy with good accuracy demonstrating their effectiveness as spin-labels.
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Affiliation(s)
- H. Y. Vincent Ching
- Institute for Integrative Biology of the Cell (I2BC)
- Department of Biochemistry
- Biophysics and Structural Biology
- Université Paris-Saclay
- CEA
| | - Paul Demay-Drouhard
- Ecole Normale Supérieure-PSL Research University
- Départment de Chimie
- Sorbonne Universités – UPMC Univ Paris 06
- CNRS UMR 7203 LBM
- F-75005 Paris
| | - Hélène C. Bertrand
- Ecole Normale Supérieure-PSL Research University
- Départment de Chimie
- Sorbonne Universités – UPMC Univ Paris 06
- CNRS UMR 7203 LBM
- F-75005 Paris
| | - Clotilde Policar
- Ecole Normale Supérieure-PSL Research University
- Départment de Chimie
- Sorbonne Universités – UPMC Univ Paris 06
- CNRS UMR 7203 LBM
- F-75005 Paris
| | - Leandro C. Tabares
- Institute for Integrative Biology of the Cell (I2BC)
- Department of Biochemistry
- Biophysics and Structural Biology
- Université Paris-Saclay
- CEA
| | - Sun Un
- Institute for Integrative Biology of the Cell (I2BC)
- Department of Biochemistry
- Biophysics and Structural Biology
- Université Paris-Saclay
- CEA
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117
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Saha S, Jagtap AP, Sigurdsson ST. Site-directed spin labeling of 2′-amino groups in RNA with isoindoline nitroxides that are resistant to reduction. Chem Commun (Camb) 2015; 51:13142-5. [DOI: 10.1039/c5cc05014f] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
2'-Amino groups in RNA were selectively spin labeled with reductively stable isoindoline nitroxides through a high-yielding reaction with aromatic isothiocyanates.
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Affiliation(s)
- Subham Saha
- University of Iceland
- Department of Chemistry
- Science Institute
- 107 Reykjavik
- Iceland
| | - Anil P. Jagtap
- University of Iceland
- Department of Chemistry
- Science Institute
- 107 Reykjavik
- Iceland
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118
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Antihypertensive effect of mitochondria-targeted proxyl nitroxides. Redox Biol 2014; 4:355-62. [PMID: 25677087 PMCID: PMC4326181 DOI: 10.1016/j.redox.2014.12.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 12/22/2014] [Indexed: 01/18/2023] Open
Abstract
Superoxide (O2-•) has been implicated in the pathogenesis of many human diseases including hypertension. Mitochondria-targeted superoxide scavenger mitoTEMPO reduces blood pressure; however, the structure–functional relationships in antihypertensive effect of mitochondria-targeted nitroxides remain unclear. The nitroxides are known to undergo bioreduction into hydroxylamine derivatives which reacts with O2-• with much lower rate. The nitroxides of pyrrolidine series (proxyls) are much more resistant to bioreduction compared to TEMPOL derivatives suggesting that mitochondria-targeted proxyls can be effective antioxidants with antihypertensive activity. In this work we have designed and studied two new pyrrolidine mitochondria targeted nitroxides: 3-[2-(triphenyphosphonio)acetamido]- and 3-[2-(triphenyphosphonio) acetamidomethyl]-2,2,5,5-tetramethylpyrrolidine-1-oxyl (mCP2) and (mCP1). These new mitochondria targeted nitroxides have 3- to 7-fold lower rate constants of the reaction with O2-• compared with mitoTEMPO; however, the cellular bioreduction of mCP1 and mCP2 was 3- and 2-fold slower. As a consequence incubation with cells afforded much higher intracellular concentration of mCP1 and mCP2 nitroxides compared to mitoTEMPO nitroxide. This has compensated for the difference in the rate of O2-• scavenging and all nitroxides similarly protected mitochondrial respiration in H2O2 treated endothelial cells. Treatment of hypertensive mice with mCP1 and mCP2 (1.4 mg/kg/day) after onset of angiotensin II-induced hypertension significantly reduced blood pressure to 133±5 mmHg and 129±6 mmHg compared to 163±5 mmHg in mice infused with angiotensin II alone. mCP1 and mCP2 reduced vascular O2-• and prevented decrease of endothelial nitric oxide production. These data indicate that resistance to bioreduction play significant role in antioxidant activity of nitroxides. Studies of nitroxide analogs such as mCP1 and mCP2 may help in optimization of chemical structure of mitochondria-targeted nitroxides for improved efficacy and pharmacokinetics of these drugs in treatment of hypertension and many other conditions including atherosclerosis, diabetes and degenerative neurological disorders in which mitochondrial oxidative stress seems to play a role. Nitroxides bioreduction into hydroxylamine can reduce their antioxidant properties. Mitochondria-targeted proxyls are more resistant to bioreduction vs mitoTEMPO. Intracellular concentration of mCP1 and mCP2 nitroxides is higher vs mitoTEMPO. mCP1 and mCP2 diminished vascular superoxide and reduced hypertension.
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