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Characterization of radicals in polysorbate 80 using electron paramagnetic resonance (EPR) spectroscopy and spin trapping. Int J Pharm X 2022; 4:100123. [PMID: 35795322 PMCID: PMC9251573 DOI: 10.1016/j.ijpx.2022.100123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 11/21/2022] Open
Abstract
Polysorbates are an important class of nonionic surfactants that are widely used to stabilize biopharmaceuticals. The degradation of polysorbate 20 and 80 and the related particle formation in biologics are heavily discussed in the pharmaceutical community. Although a lot of experimental effort was spent in the detailed study of potential degradation pathways, the underlying mechanisms are only sparsely understood. Besides enzymatic hydrolysis, another proposed mechanism is associated with radical-induced (auto)oxidation of polysorbates. To characterize the types and the origin of the involved radicals and their propagation in bulk material as well as in diluted polysorbate 80 solutions, we applied electron paramagnetic resonance (EPR) spectroscopy using a spin trapping approach. The prerequisite for a meaningful experiment using spin traps is an understanding of the trapping rate, which is an interplay of (i) the presence of the spin trap at the scene of action, (ii) the specific reactivity of the selected spin trap with a certain radical as well as (iii) the stability of the formed spin adducts (a slow decay rate). We discuss whether and to which extent these criteria are fulfilled regarding the identification of different radical classes that might be involved in polysorbate oxidative degradation processes. The ratio of different radicals for different scenarios was determined for various polysorbate 80 quality grades in bulk material and in aqueous solution, showing differences in the ratio of present radicals. Possible correlations between the radical content and product parameters such as the quality grade, the manufacturing date, the manufacturer, the initial peroxide content according to the certificate of analysis of polysorbate 80 are discussed.
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Miao Q, Nitsche C, Orton H, Overhand M, Otting G, Ubbink M. Paramagnetic Chemical Probes for Studying Biological Macromolecules. Chem Rev 2022; 122:9571-9642. [PMID: 35084831 PMCID: PMC9136935 DOI: 10.1021/acs.chemrev.1c00708] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Indexed: 12/11/2022]
Abstract
Paramagnetic chemical probes have been used in electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) spectroscopy for more than four decades. Recent years witnessed a great increase in the variety of probes for the study of biological macromolecules (proteins, nucleic acids, and oligosaccharides). This Review aims to provide a comprehensive overview of the existing paramagnetic chemical probes, including chemical synthetic approaches, functional properties, and selected applications. Recent developments have seen, in particular, a rapid expansion of the range of lanthanoid probes with anisotropic magnetic susceptibilities for the generation of structural restraints based on residual dipolar couplings and pseudocontact shifts in solution and solid state NMR spectroscopy, mostly for protein studies. Also many new isotropic paramagnetic probes, suitable for NMR measurements of paramagnetic relaxation enhancements, as well as EPR spectroscopic studies (in particular double resonance techniques) have been developed and employed to investigate biological macromolecules. Notwithstanding the large number of reported probes, only few have found broad application and further development of probes for dedicated applications is foreseen.
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Affiliation(s)
- Qing Miao
- Leiden
Institute of Chemistry, Leiden University, Einsteinweg 55, Leiden 2333 CC, The Netherlands
- School
of Chemistry &Chemical Engineering, Shaanxi University of Science & Technology, Xi’an710021, China
| | - Christoph Nitsche
- Research
School of Chemistry, The Australian National
University, Sullivans Creek Road, Canberra, Australian Capital Territory 2601, Australia
| | - Henry Orton
- Research
School of Chemistry, The Australian National
University, Sullivans Creek Road, Canberra, Australian Capital Territory 2601, Australia
- ARC
Centre of Excellence for Innovations in Peptide & Protein Science,
Research School of Chemistry, Australian
National University, Sullivans Creek Road, Canberra, Australian Capital Territory 2601, Australia
| | - Mark Overhand
- Leiden
Institute of Chemistry, Leiden University, Einsteinweg 55, Leiden 2333 CC, The Netherlands
| | - Gottfried Otting
- Research
School of Chemistry, The Australian National
University, Sullivans Creek Road, Canberra, Australian Capital Territory 2601, Australia
- ARC
Centre of Excellence for Innovations in Peptide & Protein Science,
Research School of Chemistry, Australian
National University, Sullivans Creek Road, Canberra, Australian Capital Territory 2601, Australia
| | - Marcellus Ubbink
- Leiden
Institute of Chemistry, Leiden University, Einsteinweg 55, Leiden 2333 CC, The Netherlands
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3
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Selmi S, Alimi D, Rtibi K, Jedidi S, Grami D, Marzouki L, Hosni K, Sebai H. Gastroprotective and Antioxidant Properties of Trigonella foenum graecum Seeds Aqueous Extract (Fenugreek) and Omeprazole Against Ethanol-Induced Peptic Ulcer. J Med Food 2022; 25:513-522. [PMID: 35561273 DOI: 10.1089/jmf.2020.0217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Trigonella foenum graecum (Fenugreek) is used in traditional phytomedicine for its anti-inflammatory, antiseptic, antidiabetic, and several other therapeutic virtues. The current study was intended to investigate the protecting effects of fenugreek seeds' aqueous extract (FSAE) using experimentally ethanol (EtOH)-induced gastric peptic ulcer in rats, as immense alcohol consumption can lead to gastric ulcer. Sixty adult male Wistar rats were divided into 6 groups of 10 each: control, EtOH (4 g/kg body weight [b.w.]), EtOH + several doses of FSAE (50, 100, and 200 mg/kg b.w.), and EtOH + Omeprazole (OM, 20 mg/kg orally [p.o.]). Animals were p.o. pretreated with FSAE for 21 days and exposed to a single oral administration of EtOH (4 g/kg b.w.) for 2 h. Gastric ulcer in rats was induced with a single dose of EtOH. Ulcer index, malondialdehyde (MDA), hydrogen peroxide (H2O2), and thiol groups (-SH) content in stomach, and antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) were measured. Our recorded results showed that EtOH induced gastric damage, evidenced by the level of oxidative stress markers such as MDA and H2O2 in rats exposed to EtOH. However, significant increases in the activities of antioxidant enzymes were recorded, such as SOD, CAT, and GPx, and a decrease in nonenzymatic antioxidants, such as (-SH). Moreover, histopathological examinations showed the presence of lesions associated with severe tissue damage in the untreated rats. Interestingly, FSAE meaningfully protects against all gastric damages caused by EtOH. We propose that FSAE exhibits protective effects in EtOH-induced peptic ulcer in rats. This protection might be related to its antioxidant and anti-inflammatory properties as well as its opposite effects on some studied intracellular mediators.
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Affiliation(s)
- Slimen Selmi
- Laboratory of Functional Physiology and Bio-resources Valorisation, Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia.,Laboratory of Natural Substances, National Institute for Research and Physico-Chemical Analysis (INRAP), Technopole Sidi Thabet, Technological Pole, Ariana, Tunisia
| | - Dhouha Alimi
- Laboratory of Functional Physiology and Bio-resources Valorisation, Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
| | - Kais Rtibi
- Laboratory of Functional Physiology and Bio-resources Valorisation, Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
| | - Saber Jedidi
- Sylvo-Pastoral Resources Laboratory, Sylvo-Pastoral Institute of Tabarka, University of Jendouba, Tabarka, Tunisia
| | - Dhekra Grami
- Laboratory of Functional Physiology and Bio-resources Valorisation, Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
| | - Lamjed Marzouki
- Laboratory of Functional Physiology and Bio-resources Valorisation, Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
| | - Karim Hosni
- Laboratory of Natural Substances, National Institute for Research and Physico-Chemical Analysis (INRAP), Technopole Sidi Thabet, Technological Pole, Ariana, Tunisia
| | - Hichem Sebai
- Laboratory of Functional Physiology and Bio-resources Valorisation, Higher Institute of Biotechnology of Beja, University of Jendouba, Beja, Tunisia
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4
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Tretyakov EV, Ovcharenko VI, Terent'ev AO, Krylov IB, Magdesieva TV, Mazhukin DG, Gritsan NP. Conjugated nitroxide radicals. RUSSIAN CHEMICAL REVIEWS 2022. [DOI: 10.1070/rcr5025] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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5
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Timofeev IO, Politanskaya LV, Tretyakov EV, Polienko YF, Tormyshev VM, Bagryanskaya E, Krumkacheva OA, Fedin MV. Fullerene-based triplet spin labels: methodology aspects for pulsed dipolar EPR spectroscopy. Phys Chem Chem Phys 2022; 24:4475-4484. [DOI: 10.1039/d1cp05545c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Triplet states of photoexcited organic molecules are promising spin labels with advanced spectroscopic properties for Pulsed Dipolar Electron Paramagnetic Resonance (PD EPR) spectroscopy. Recently proposed triplet fullerene labels have shown...
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6
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Schiemann O, Heubach CA, Abdullin D, Ackermann K, Azarkh M, Bagryanskaya EG, Drescher M, Endeward B, Freed JH, Galazzo L, Goldfarb D, Hett T, Esteban Hofer L, Fábregas Ibáñez L, Hustedt EJ, Kucher S, Kuprov I, Lovett JE, Meyer A, Ruthstein S, Saxena S, Stoll S, Timmel CR, Di Valentin M, Mchaourab HS, Prisner TF, Bode BE, Bordignon E, Bennati M, Jeschke G. Benchmark Test and Guidelines for DEER/PELDOR Experiments on Nitroxide-Labeled Biomolecules. J Am Chem Soc 2021; 143:17875-17890. [PMID: 34664948 PMCID: PMC11253894 DOI: 10.1021/jacs.1c07371] [Citation(s) in RCA: 105] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Distance distribution information obtained by pulsed dipolar EPR spectroscopy provides an important contribution to many studies in structural biology. Increasingly, such information is used in integrative structural modeling, where it delivers unique restraints on the width of conformational ensembles. In order to ensure reliability of the structural models and of biological conclusions, we herein define quality standards for sample preparation and characterization, for measurements of distributed dipole-dipole couplings between paramagnetic labels, for conversion of the primary time-domain data into distance distributions, for interpreting these distributions, and for reporting results. These guidelines are substantiated by a multi-laboratory benchmark study and by analysis of data sets with known distance distribution ground truth. The study and the guidelines focus on proteins labeled with nitroxides and on double electron-electron resonance (DEER aka PELDOR) measurements and provide suggestions on how to proceed analogously in other cases.
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Affiliation(s)
- Olav Schiemann
- Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, 53115 Bonn, Germany
| | - Caspar A Heubach
- Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, 53115 Bonn, Germany
| | - Dinar Abdullin
- Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, 53115 Bonn, Germany
| | - Katrin Ackermann
- EaStCHEM School of Chemistry, Biomedical Sciences Research Complex, and Centre of Magnetic Resonance, University of St Andrews North Haugh, St Andrews KY16 9ST, U.K
| | - Mykhailo Azarkh
- Department of Chemistry and Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
| | - Elena G Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Lavrentieva aven 9, 630090 Novosibirsk, Russia
| | - Malte Drescher
- Department of Chemistry and Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
| | - Burkhard Endeward
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt am Main, Germany
| | - Jack H Freed
- Department of Chemistry and Chemical Biology, and ACERT, National Biomedical Center for Advanced Electron Spin Resonance Technology, Cornell University, Ithaca, New York 14853-1301, United States
| | - Laura Galazzo
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Daniella Goldfarb
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Tobias Hett
- Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, 53115 Bonn, Germany
| | - Laura Esteban Hofer
- Department of Chemistry and Applied Biosciences, ETH Hönggerberg, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Luis Fábregas Ibáñez
- Department of Chemistry and Applied Biosciences, ETH Hönggerberg, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Eric J Hustedt
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee 37232, United States
| | - Svetlana Kucher
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Ilya Kuprov
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, U.K
| | - Janet Eleanor Lovett
- SUPA School of Physics and Astronomy and BSRC, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K
| | - Andreas Meyer
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Sharon Ruthstein
- Department of Chemistry, Bar Ilan University, Ramat Gan 5290002, Israel
| | - Sunil Saxena
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Stefan Stoll
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Christiane R Timmel
- Department of Chemistry, Centre for Advanced Electron Spin Resonance, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K
| | - Marilena Di Valentin
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Hassane S Mchaourab
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee 37232, United States
| | - Thomas F Prisner
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt am Main, Germany
| | - Bela Ernest Bode
- EaStCHEM School of Chemistry, Biomedical Sciences Research Complex, and Centre of Magnetic Resonance, University of St Andrews North Haugh, St Andrews KY16 9ST, U.K
| | - Enrica Bordignon
- Faculty of Chemistry and Biochemistry, Ruhr University Bochum, 44801 Bochum, Germany
| | - Marina Bennati
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Gunnar Jeschke
- Department of Chemistry and Applied Biosciences, ETH Hönggerberg, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
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7
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Jiang X, Boudreau MD, Fu PP, Yin JJ. Applications of electron spin resonance spectroscopy in photoinduced nanomaterial charge separation and reactive oxygen species generation. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, TOXICOLOGY AND CARCINOGENESIS 2021; 39:435-459. [PMID: 35895951 DOI: 10.1080/26896583.2021.1971477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Nano-metals, nano-metal oxides, and carbon-based nanomaterials exhibit superior solar-to-chemical/photo-electron transfer properties and are potential candidates for environmental remediations and energy transfer. Recent research effort focuses on enhancing the efficiency of photoinduced electron-hole separation to improve energy transfer in catalytic reactions. Electron spin resonance (ESR) spectroscopy has been used to monitor the generation of electron/hole and reactive oxygen species (ROS) during nanomaterial-mediated photocatalysis. Using ESR coupled with spin trapping and spin labeling techniques, the underlying photocatalytic mechanism involved in the nanomaterial-mediated photocatalysis was investigated. In this review, we briefly introduced ESR principle and summarized recent advancements using ESR spectroscopy to characterize electron-hole separation and ROS production by different types of nanomaterials.
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Affiliation(s)
- Xiumei Jiang
- Division of Analytical Chemistry, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
| | - Mary D Boudreau
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Peter P Fu
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, USA
| | - Jun-Jie Yin
- Division of Analytical Chemistry, Center for Food Safety and Applied Nutrition, U.S. Food and Drug Administration, College Park, MD, USA
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8
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Pinheiro AC, Fazzi RB, Esteves LC, Machado CO, Dörr FA, Pinto E, Hattori Y, Sa J, da Costa Ferreira AM, Bastos EL. A bioinspired nitrone precursor to a stabilized nitroxide radical. Free Radic Biol Med 2021; 168:110-116. [PMID: 33798616 DOI: 10.1016/j.freeradbiomed.2021.03.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/09/2021] [Accepted: 03/24/2021] [Indexed: 01/23/2023]
Abstract
Nitrones derived from natural antioxidants are emerging as highly specific therapeutics against various human diseases, including stroke, neurodegenerative pathologies, and cancer. However, the development of useful pseudo-natural nitrones requires the judicious choice of a secondary metabolite as the precursor. Betalains are nitrogen-containing natural pigments that exhibit marked antioxidant capacity and pharmacological properties and, hence, are ideal candidates for designing multifunctional nitrones. In this work, we describe the semisynthesis and properties of a biocompatible and antioxidant betalain-nitrone called OxiBeet. This bio-based compound is a better radical scavenger than ascorbic acid, gallic acid, and most non-phenolic antioxidants and undergoes concerted proton-coupled electron transfer. The autoxidation of OxiBeet produces a persistent nitroxide radical, which, herein, is studied via electron paramagnetic resonance spectroscopy. In addition, femtosecond transient absorption spectroscopy reveals that excited state formation is not required for the oxidation of OxiBeet. The results are compared with those obtained using betanin, a natural betalain, and pBeet, the imine analog of OxiBeet. The findings of this study will enable the development of antioxidant and spin-trap nitrones based on the novel N-oxide 1,7-diazaheptamethinium scaffold and betalain dyes with enhanced hydrolytic stability in aqueous alkaline media.
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Affiliation(s)
- Amanda Capistrano Pinheiro
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Rodrigo Boni Fazzi
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Larissa Cerrato Esteves
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Caroline Oliveira Machado
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Felipe Augusto Dörr
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Ernani Pinto
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Yocefu Hattori
- Physical Chemistry Division, Department of Chemistry, Ångström Laboratory, Uppsala University, 75120, Uppsala, Sweden
| | - Jacinto Sa
- Physical Chemistry Division, Department of Chemistry, Ångström Laboratory, Uppsala University, 75120, Uppsala, Sweden; Institute of Physical Chemistry, Polish Academy of Sciences, 01-224, Warsaw, Poland
| | - Ana Maria da Costa Ferreira
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Erick Leite Bastos
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil.
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9
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Zaytseva EV, Mazhukin DG. Spirocyclic Nitroxides as Versatile Tools in Modern Natural Sciences: From Synthesis to Applications. Part I. Old and New Synthetic Approaches to Spirocyclic Nitroxyl Radicals. Molecules 2021; 26:677. [PMID: 33525514 PMCID: PMC7865516 DOI: 10.3390/molecules26030677] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/19/2021] [Accepted: 01/25/2021] [Indexed: 12/19/2022] Open
Abstract
Spirocyclic nitroxyl radicals (SNRs) are stable paramagnetics bearing spiro-junction at a-, b-, or g-carbon atom of the nitroxide fragment, which is part of the heterocyclic system. Despite the fact that the first representatives of SNRs were obtained about 50 years ago, the methodology of their synthesis and their usage in chemistry and biochemical applications have begun to develop rapidly only in the last two decades. Due to the presence of spiro-function in the SNRs molecules, the latter have increased stability to various reducing agents (including biogenic ones), while the structures of the biradicals (SNBRs) comprises a rigid spiro-fused core that fixes mutual position and orientation of nitroxide moieties that favors their use in dynamic nuclear polarization (DNP) experiments. This first review on SNRs will give a glance at various strategies for the synthesis of spiro-substituted, mono-, and bis-nitroxides on the base of six-membered (piperidine, 1,2,3,4-tetrahydroquinoline, 9,9'(10H,10H')-spirobiacridine, piperazine, and morpholine) or five-membered (2,5-dihydro-1H-pyrrole, pyrrolidine, 2,5-dihydro-1H-imidazole, 4,5-dihydro-1H-imidazole, imidazolidine, and oxazolidine) heterocyclic cores.
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Affiliation(s)
| | - Dmitrii G. Mazhukin
- Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences (SB RAS), Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia;
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10
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Abdullin D, Schiemann O. Localization of metal ions in biomolecules by means of pulsed dipolar EPR spectroscopy. Dalton Trans 2021; 50:808-815. [PMID: 33416053 DOI: 10.1039/d0dt03596c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal ions are important for the folding, structure, and function of biomolecules. Thus, knowing where their binding sites are located in proteins or oligonucleotides is a critical objective. X-ray crystallography and nuclear magnetic resonance are powerful methods in this respect, but both have their limitations. Here, a complementary method is highlighted in which paramagnetic metal ions are localized by means of trilateration using a combination of site-directed spin labeling and pulsed dipolar electron paramagnetic resonance spectroscopy. The working principle, the requirements, and the limitations of the method are critically discussed. Several applications of the method are outlined and compared with each other.
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Affiliation(s)
- Dinar Abdullin
- Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstr. 12, 53115 Bonn, Germany.
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11
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Jedidi S, Aloui F, Rtibi K, Sammari H, Selmi H, Rejeb A, Toumi L, Sebai H. Individual and synergistic protective properties of Salvia officinalis decoction extract and sulfasalazine against ethanol-induced gastric and small bowel injuries. RSC Adv 2020; 10:35998-36013. [PMID: 35517119 PMCID: PMC9056994 DOI: 10.1039/d0ra03265d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 09/22/2020] [Indexed: 12/12/2022] Open
Abstract
The present study was carried out to determine the phytochemical composition of Salvia officinalis flowers decoction extract (SOFDE) as well as its individual and/or synergistic actions with sulfasalazine against ethanol (EtOH)-induced peptic ulcer in Wistar rats. In this respect, rats were divided into six groups of eight animals each: control, EtOH, EtOH + sulfasalazine (SULF, 100 mg kg-1, b.w., p.o.), mixture: MIX (SOFDE, 50 mg kg-1 b.w., p.o. + SULF, 50 mg kg-1, b.w., p.o.) and EtOH + two doses of SOFDE (100 and 200 mg kg-1 b.w., p.o.). In vitro, the phytochemical and the antioxidant properties were determined using colorimetric analysis. HPLC-PDA/ESI-MS assay was used to identify the distinctive qualitative profile of phenolic compounds. Our results firstly indicated that SOFDE is rich in total tannins, flavonols, anthocyanins and a moderate concentration of total carotenoids. Chromatographic techniques allowed the identification of 13 phenolic compounds and the major ones are quinic acid, protocatechuic acid, gallic acid and salviolinic acid. SOFDE also exhibited an important in vitro antioxidant activity using the β-carotene bleaching method. In vivo, SOFDE and the mixture provide significant protection against ethanol-induced gastric and duodenal macroscopic and histological alterations. Also, SOFDE alone or in combination with SULF, showed a significant protection against the secretory profile disturbances, lipid peroxidation, antioxidant enzyme activities and non-enzymatic antioxidant level depletion induced by alcohol administration. Importantly, we showed that EtOH acute intoxication increased gastric and intestinal calcium, free iron, magnesium and hydrogen peroxide (H2O2) levels, while SOFDE/MIX treatment protected against all these intracellular mediators' deregulation. We also showed that alcohol treatment significantly increased the C-reactive protein (CRP) and alkaline phosphatase (ALP) activities in plasma. The SOFDE and MIX treatment significantly protected against alcohol-induced inflammation. More importantly, we showed in the present work that the mixture exerted a more important effect than SOFDE and SULF each alone indicating a possible synergism between these two molecules. In conclusion, our data suggests that SOFDE and SULF exerted a potential synergistic protective effect against all the macroscopic, histological and biochemical disturbances induced by EtOH intoxication. This protection might be related in part to its antioxidant and anti-inflammatory properties as well as by negatively regulating Fenton reaction components such as H2O2 and free iron.
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Affiliation(s)
- Saber Jedidi
- Unité de Physiologie Fonctionnelle et Valorisation des Bio-Ressources, Université de Jendouba, Institut Superieur de Biotechnologie de Beja Avenue Habib Bourguiba, B.P. 382 9000 Beja Tunisia +216 78 459 098 +216 97 249 486.,Laboratoire des Ressources Sylvo-Pastorales, Université de Jendouba, Institut Sylvo-Pastoral de Tabarka B.P. 345 8110 Tabarka Tunisia.,Universite de Carthage, Faculté des Sciences de Bizerte 7021 Jarzouna Tunisia
| | - Foued Aloui
- Laboratoire des Ressources Sylvo-Pastorales, Université de Jendouba, Institut Sylvo-Pastoral de Tabarka B.P. 345 8110 Tabarka Tunisia
| | - Kais Rtibi
- Unité de Physiologie Fonctionnelle et Valorisation des Bio-Ressources, Université de Jendouba, Institut Superieur de Biotechnologie de Beja Avenue Habib Bourguiba, B.P. 382 9000 Beja Tunisia +216 78 459 098 +216 97 249 486
| | - Houcem Sammari
- Laboratoire des Ressources Sylvo-Pastorales, Université de Jendouba, Institut Sylvo-Pastoral de Tabarka B.P. 345 8110 Tabarka Tunisia
| | - Houcine Selmi
- Laboratoire des Ressources Sylvo-Pastorales, Université de Jendouba, Institut Sylvo-Pastoral de Tabarka B.P. 345 8110 Tabarka Tunisia
| | - Ahmed Rejeb
- Laboratoire d'Anatomie Pathologique, Université de Manouba, Ecole Nationale de Médecine Vétérinaire de Sidi Thabet 2020 Sidi Thabet Tunisia
| | - Lamjed Toumi
- Laboratoire des Ressources Sylvo-Pastorales, Université de Jendouba, Institut Sylvo-Pastoral de Tabarka B.P. 345 8110 Tabarka Tunisia
| | - Hichem Sebai
- Unité de Physiologie Fonctionnelle et Valorisation des Bio-Ressources, Université de Jendouba, Institut Superieur de Biotechnologie de Beja Avenue Habib Bourguiba, B.P. 382 9000 Beja Tunisia +216 78 459 098 +216 97 249 486
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12
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Sannikova NE, Timofeev IO, Chubarov AS, Lebedeva NS, Semeikin AS, Kirilyuk IA, Tsentalovich YP, Fedin MV, Bagryanskaya EG, Krumkacheva OA. Application of EPR to porphyrin-protein agents for photodynamic therapy. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2020; 211:112008. [PMID: 32932136 DOI: 10.1016/j.jphotobiol.2020.112008] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/17/2020] [Accepted: 08/21/2020] [Indexed: 12/19/2022]
Abstract
Recently, a new type of spin labels based on photoexcited triplet molecules was proposed for nanometer scale distance measurements by pulsed dipolar electron paramagnetic resonance (PD EPR). However, such molecules are also actively used within biological complexes as photosensitizers for photodynamic therapy (PDT) of cancer. Up to date, the idea of using the photoexcited triplets simultaneously as PDT agents and as spin labels for PD EPR has never been employed. In this work, we demonstrate that PD EPR in conjunction with other methods provides valuable information on the structure and function of PDT candidate complexes, exemplified here with porphyrins bound to human serum albumin (HSA). Two distinct porphyrins with different properties were used: amphiphilic meso-tetrakis(4-hydroxyphenyl)porphyrin (mTHPP) and water soluble cationic meso-tetrakis(N-methyl-4-pyridyl)porphyrin (TMPyP4); HSA was singly nitroxide-labeled to provide a second tag for PD EPR measurements. We found that TMPyP4 locates in a cavity at the center of the four-helix bundle of HSA subdomain IB, close to the interface with solvent, thus being readily accessible to oxygen. As a result, the photolysis of the complex leads to photooxidation of HSA by generated singlet oxygen and causes structural perturbation of the protein. Contrary, in case of mTHPP porphyrin, the binding occurs at the proton-rich pocket of HSA subdomain IIIA, where the access of oxygen to a photosensitizer is hindered. Structural data of PD EPR were supported by other EPR techniques, laser flash photolysis and protein photocleavage studies. Therefore, pulsed EPR on complexes of proteins with photoexcited triplets is a promising approach for gaining structural and functional insights into such PDT agents.
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Affiliation(s)
| | - Ivan O Timofeev
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia
| | - Alexey S Chubarov
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia
| | | | | | - Igor A Kirilyuk
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, 630090 Novosibirsk, Russia
| | | | - Matvey V Fedin
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia; Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.
| | - Elena G Bagryanskaya
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, 630090 Novosibirsk, Russia.
| | - Olesya A Krumkacheva
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia; Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.
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13
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Audran G, Bagryanskaya EG, Marque SRA, Postnikov P. New Variants of Nitroxide Mediated Polymerization. Polymers (Basel) 2020; 12:polym12071481. [PMID: 32630664 PMCID: PMC7408045 DOI: 10.3390/polym12071481] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 06/24/2020] [Accepted: 06/25/2020] [Indexed: 01/17/2023] Open
Abstract
Nitroxide-mediated polymerization is now a mature technique, at 35 years of age. During this time, several variants have been developed: enhanced spin capture polymerization (ESCP), photoNMP (NMP2), chemically initiated NMP (CI-NMP), spin label NMP (SL-NMP), and plasmon-initiated NMP (PI-NMP). This mini-review is devoted to the features and applications of these variants.
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Affiliation(s)
- Gérard Audran
- Aix Marseille Univ, CNRS, ICR, UMR 7273, Case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France
- Correspondence: (G.A.); (E.G.B); (S.R.A.M.); (P.P.)
| | - Elena G. Bagryanskaya
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry Siberian Branch of Russian Academy of Sciences, Pr. Lavrentjeva 9, Novosibirsk 630090, Russia
- Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
- Correspondence: (G.A.); (E.G.B); (S.R.A.M.); (P.P.)
| | - Sylvain R. A. Marque
- Aix Marseille Univ, CNRS, ICR, UMR 7273, Case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France
- Correspondence: (G.A.); (E.G.B); (S.R.A.M.); (P.P.)
| | - Pavel Postnikov
- Department of Solid State Engineering, University of Chemistry and Technology, 16628 Prague, Czech Republic
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Lenin Ave, 30, Tomsk, Tomsk Oblast 634050, Russia
- Correspondence: (G.A.); (E.G.B); (S.R.A.M.); (P.P.)
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14
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Sannikova N, Timofeev I, Bagryanskaya E, Bowman M, Fedin M, Krumkacheva O. Electron Spin Relaxation of Photoexcited Porphyrin in Water-Glycerol Glass. Molecules 2020; 25:E2677. [PMID: 32527023 PMCID: PMC7321249 DOI: 10.3390/molecules25112677] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/05/2020] [Accepted: 06/06/2020] [Indexed: 02/07/2023] Open
Abstract
Recently, the photoexcited triplet state of porphyrin was proposed as a promising spin-label for pulsed dipolar electron paramagnetic resonance (EPR). Herein, we report the factors that determine the electron spin echo dephasing of the photoexcited porphyrin in a water-glycerol matrix. The electron spin relaxation of a water-soluble porphyrin was measured by Q-band EPR, and the temperature dependence and the effect of solvent deuteration on the relaxation times were studied. The phase memory relaxation rate (1/Tm) is noticeably affected by solvent nuclei and is substantially faster in protonated solvents than in deuterated solvents. The Tm is as large as 13-17 μs in deuterated solvent, potentially expanding the range of distances available for measurement by dipole spectroscopy with photoexcited porphyrin. The 1/Tm depends linearly on the degree of solvent deuteration and can be used to probe the environment of a porphyrin in or near a biopolymer, including the solvent accessibility of porphyrins used in photodynamic therapy. We characterized the noncovalent binding of porphyrin to human serum albumin (HSA) from 1/Tm and electron spin echo envelope modulation (ESEEM) and found that porphyrin is quite exposed to solvent on the surface of HSA. The 1/Tm and ESEEM are equally effective and provide complementary methods to determine the solvent accessibility of a porphyrin bound to protein or to determine the location of the porphyrin.
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Affiliation(s)
- Natalya Sannikova
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia; (N.S.); (I.T.)
| | - Ivan Timofeev
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia; (N.S.); (I.T.)
| | - Elena Bagryanskaya
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, 630090 Novosibirsk, Russia
| | - Michael Bowman
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, 630090 Novosibirsk, Russia
- Department of Chemistry & Biochemistry, University of Alabama, Tuscaloosa, AL 35487-0336, USA
| | - Matvey Fedin
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia; (N.S.); (I.T.)
| | - Olesya Krumkacheva
- International Tomography Center SB RAS, 630090 Novosibirsk, Russia; (N.S.); (I.T.)
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15
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Leung PKK, Lo KKW. Modulation of emission and singlet oxygen photosensitisation in live cells utilising bioorthogonal phosphorogenic probes and protein tag technology. Chem Commun (Camb) 2020; 56:6074-6077. [DOI: 10.1039/d0cc02056g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We developed a strategy to exploit the bioorthogonal reactivity and phosphorogenic property of iridium(iii) polypyridine nitrone complexes and SNAP-tag protein for the modulation of emission and single oxygen photosensitisation in live cells.
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Affiliation(s)
| | - Kenneth Kam-Wing Lo
- Department of Chemistry
- City University of Hong Kong
- Kowloon
- P. R. China
- State Key Laboratory of Terahertz and Millimeter Waves
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16
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Abdullin D, Brehm P, Fleck N, Spicher S, Grimme S, Schiemann O. Pulsed EPR Dipolar Spectroscopy on Spin Pairs with one Highly Anisotropic Spin Center: The Low-Spin Fe III Case. Chemistry 2019; 25:14388-14398. [PMID: 31386227 PMCID: PMC6900076 DOI: 10.1002/chem.201902908] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 08/05/2019] [Indexed: 02/01/2023]
Abstract
Pulsed electron paramagnetic resonance (EPR) dipolar spectroscopy (PDS) offers several methods for measuring dipolar coupling constants and thus the distance between electron spin centers. Up to now, PDS measurements have been mostly applied to spin centers whose g-anisotropies are moderate and therefore have a negligible effect on the dipolar coupling constants. In contrast, spin centers with large g-anisotropy yield dipolar coupling constants that depend on the g-values. In this case, the usual methods of extracting distances from the raw PDS data cannot be applied. Here, the effect of the g-anisotropy on PDS data is studied in detail on the example of the low-spin Fe3+ ion. First, this effect is described theoretically, using the work of Bedilo and Maryasov (Appl. Magn. Reson. 2006, 30, 683-702) as a basis. Then, two known Fe3+ /nitroxide compounds and one new Fe3+ /trityl compound were synthesized and PDS measurements were carried out on them using a method called relaxation induced dipolar modulation enhancement (RIDME). Based on the theoretical results, a RIDME data analysis procedure was developed, which facilitated the extraction of the inter-spin distance and the orientation of the inter-spin vector relative to the Fe3+ g-tensor frame from the RIDME data. The accuracy of the determined distances and orientations was confirmed by comparison with MD simulations. This method can thus be applied to the highly relevant class of metalloproteins with, for example, low-spin Fe3+ ions.
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Affiliation(s)
- Dinar Abdullin
- Institute of Physical and Theoretical ChemistryUniversity of Bonn53115BonnGermany
| | - Philipp Brehm
- Institute of Physical and Theoretical ChemistryUniversity of Bonn53115BonnGermany
- Current address: Institute of Inorganic ChemistryUniversity of Bonn53115BonnGermany
| | - Nico Fleck
- Institute of Physical and Theoretical ChemistryUniversity of Bonn53115BonnGermany
| | - Sebastian Spicher
- Mulliken Center for Theoretical ChemistryUniversity of Bonn53115BonnGermany
| | - Stefan Grimme
- Mulliken Center for Theoretical ChemistryUniversity of Bonn53115BonnGermany
| | - Olav Schiemann
- Institute of Physical and Theoretical ChemistryUniversity of Bonn53115BonnGermany
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17
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Malygin AA, Graifer DM, Meschaninova MI, Venyaminova AG, Timofeev IO, Kuzhelev AA, Krumkacheva OA, Fedin MV, Karpova GG, Bagryanskaya EG. Structural rearrangements in mRNA upon its binding to human 80S ribosomes revealed by EPR spectroscopy. Nucleic Acids Res 2019; 46:897-904. [PMID: 29156000 PMCID: PMC5778603 DOI: 10.1093/nar/gkx1136] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 10/30/2017] [Indexed: 12/21/2022] Open
Abstract
The model mRNA (MR), 11-mer RNA containing two nitroxide spin labels at the 5′- and 3′-terminal nucleotides and prone to form a stable homodimer (MR)2, was used for Electron Paramagnetic Resonance study of structural rearrangements in mRNA occurring upon its binding to human 80S ribosomes. The formation of two different types of ribosomal complexes with MR was observed. First, there were stable complexes where MR was fixed in the ribosomal mRNA-binding channel by the codon-anticodon interaction(s) with cognate tRNA(s). Second, we for the first time detected complexes assembled without tRNA due to the binding of MR most likely to an exposed peptide of ribosomal protein uS3 away from the mRNA channel. The analysis of interspin distances allowed the conclusion that 80S ribosomes facilitate dissociation of the duplex (MR)2: the equilibrium between the duplex and the single-stranded MR shifts to MR due to its efficient binding with ribosomes. Furthermore, we observed a significant influence of tRNA bound at the ribosomal exit (E) and/or aminoacyl (A) sites on the stability of ribosomal complexes. Our findings showed that a part of mRNA bound in the ribosome channel, which is not involved in codon-anticodon interactions, has more degrees of freedom than that interacting with tRNAs.
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Affiliation(s)
- Alexey A Malygin
- Institute of Chemical Biology and Fundamental Medicine SB RAS, pr. Lavrentjeva 8, Novosibirsk 630090, Russia.,Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia
| | - Dmitri M Graifer
- Institute of Chemical Biology and Fundamental Medicine SB RAS, pr. Lavrentjeva 8, Novosibirsk 630090, Russia.,Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia
| | - Maria I Meschaninova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, pr. Lavrentjeva 8, Novosibirsk 630090, Russia
| | - Alya G Venyaminova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, pr. Lavrentjeva 8, Novosibirsk 630090, Russia
| | - Ivan O Timofeev
- Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.,International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia.,N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, pr. Lavrentjeva 9, Novosibirsk 630090, Russia
| | - Andrey A Kuzhelev
- Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.,International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia.,N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, pr. Lavrentjeva 9, Novosibirsk 630090, Russia
| | - Olesya A Krumkacheva
- Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.,International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia.,N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, pr. Lavrentjeva 9, Novosibirsk 630090, Russia
| | - Matvey V Fedin
- Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.,International Tomography Center SB RAS, Institutskaya str. 3a, Novosibirsk 630090, Russia
| | - Galina G Karpova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, pr. Lavrentjeva 8, Novosibirsk 630090, Russia.,Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia
| | - Elena G Bagryanskaya
- Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia.,N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, pr. Lavrentjeva 9, Novosibirsk 630090, Russia
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18
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Bognár B, Úr G, Sár C, Hankovszky OH, Hideg K, Kálai T. Synthesis and Application of Stable Nitroxide Free Radicals Fused with Carbocycles and Heterocycles. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190318163321] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Stable nitroxide free radicals have traditionally been associated with 2,2,6,6-
tetramethylpiperidine-1-oxyl (TEMPO) or its 4-substituted derivatives as relatively inexpensive
and readily accessible compounds with limited possibilities for further chemical
modification. Over the past two decades, there has been a resurgence of interest in stable
free radicals with proper functionalization tuned for various applications. The objective of
this review is to present recent results with synthetic methodologies to achieve stable nitroxide
free radicals fused with aromatic carbocycles and heterocycles. There are two
main approaches for accessing stable nitroxide free radicals fused with arenes, e.g., isoindoline-
like nitroxides: further functionalization and oxidation of phthalimide or inventive
functionalization of pyrroline nitroxide key compounds. The latter also offers the constructions
of versatile heterocyclic scaffolds (furan, pyrrole, thiophene, 1,2-thiazole, selenophene, pyrazole,
pyrimidine, pyridine, pyridazine, 1,5-benzothiazepine) that are fused with pyrroline or tetrahydropyridine nitroxide
rings. The possible applications of these new stable nitroxide free radicals, such as covalent spin labels
and noncovalent spin probes of proteins and nucleic acids, profluorescent probes, building blocks for construction
of dual active drugs and electroactive materials, and substances for controlled free radical polymerization,
are discussed.
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Affiliation(s)
- Balázs Bognár
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pecs, Szigeti st. 12, H-7624 Pecs, Hungary
| | - Györgyi Úr
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pecs, Szigeti st. 12, H-7624 Pecs, Hungary
| | - Cecília Sár
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pecs, Szigeti st. 12, H-7624 Pecs, Hungary
| | - Olga H. Hankovszky
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pecs, Szigeti st. 12, H-7624 Pecs, Hungary
| | - Kálmán Hideg
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pecs, Szigeti st. 12, H-7624 Pecs, Hungary
| | - Tamás Kálai
- Institute of Organic and Medicinal Chemistry, Medical School, University of Pecs, Szigeti st. 12, H-7624 Pecs, Hungary
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19
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Ding Y, Kathiresan V, Zhang X, Haworth IS, Qin PZ. Experimental Validation of the ALLNOX Program for Studying Protein-Nucleic Acid Complexes. J Phys Chem A 2019; 123:3592-3598. [PMID: 30978022 DOI: 10.1021/acs.jpca.9b01027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Measurement of distances between spectroscopic labels (e.g., spin labels, fluorophores) attached to specific sites of biomolecules is an important method for studying biomolecular complexes. ALLNOX (Addition of Labels and Linkers) has been developed as a program to model interlabel distances based on an input macromolecule structure. Here, we report validation of ALLNOX using measured distances between nitroxide spin labels attached to specific sites of a protein-DNA complex. The results demonstrate that ALLNOX predicts average interspin distances that matched with values measured with pairs of labels attached at the protein and/or DNA. This establishes a solid foundation for using spin labeling in conjunction with ALLNOX to investigate complexes without high-resolution structures. With its high degree of flexibility for the label or the target biomolecule, ALLNOX provides a useful tool for investigating the structure-function relationship in a large variety of biological molecules.
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Affiliation(s)
- Yuan Ding
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Venkatesan Kathiresan
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Xiaojun Zhang
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Ian S Haworth
- Department of Pharmacology and Pharmaceutical Sciences , University of Southern California , Los Angeles , California 90089 , United States
| | - Peter Z Qin
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States.,Department of Biological Sciences , University of Southern California , Los Angeles , California 90089 , United States
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20
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Hintz H, Vanas A, Klose D, Jeschke G, Godt A. Trityl Radicals with a Combination of the Orthogonal Functional Groups Ethyne and Carboxyl: Synthesis without a Statistical Step and EPR Characterization. J Org Chem 2019; 84:3304-3320. [DOI: 10.1021/acs.joc.8b03234] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Henrik Hintz
- Faculty of Chemistry and Center for Molecular Materials (CM2), Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany
| | - Agathe Vanas
- Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Daniel Klose
- Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Gunnar Jeschke
- Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Adelheid Godt
- Faculty of Chemistry and Center for Molecular Materials (CM2), Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany
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21
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Gorbanev Y, Privat-Maldonado A, Bogaerts A. Analysis of Short-Lived Reactive Species in Plasma-Air-Water Systems: The Dos and the Do Nots. Anal Chem 2018; 90:13151-13158. [PMID: 30289686 DOI: 10.1021/acs.analchem.8b03336] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
This Feature addresses the analysis of the reactive species generated by nonthermal atmospheric pressure plasmas, which are widely employed in industrial and biomedical research, as well as first clinical applications. We summarize the progress in detection of plasma-generated short-lived reactive oxygen and nitrogen species in aqueous solutions, discuss the potential and limitations of various analytical methods in plasma-liquid systems, and provide an outlook on the possible future research goals in development of short-lived reactive species analysis methods for a general nonspecialist audience.
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Affiliation(s)
- Yury Gorbanev
- Research Group PLASMANT, Department of Chemistry , University of Antwerp , Wilrijk , Antwerpen , Belgium BE-2610
| | - Angela Privat-Maldonado
- Research Group PLASMANT, Department of Chemistry , University of Antwerp , Wilrijk , Antwerpen , Belgium BE-2610.,Center for Oncological Research (CORE) , University of Antwerp , Wilrijk , Antwerpen , Belgium BE-2610
| | - Annemie Bogaerts
- Research Group PLASMANT, Department of Chemistry , University of Antwerp , Wilrijk , Antwerpen , Belgium BE-2610
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22
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Takahashi Y, Matsuhashi R, Miura Y, Yoshioka N. Magnetic Interactions through a Nonconjugated Framework Observed in Back-to-Back Connected Triazinyl-Nitroxyl Biradical Derivatives. Chemistry 2018; 24:7939-7948. [DOI: 10.1002/chem.201800163] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Indexed: 11/12/2022]
Affiliation(s)
- Yusuke Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Ryo Matsuhashi
- Department of Applied Chemistry, Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Youhei Miura
- Department of Applied Chemistry, Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Naoki Yoshioka
- Department of Applied Chemistry, Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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23
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Giassa IC, Rynes J, Fessl T, Foldynova-Trantirkova S, Trantirek L. Advances in the cellular structural biology of nucleic acids. FEBS Lett 2018; 592:1997-2011. [PMID: 29679394 DOI: 10.1002/1873-3468.13054] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 03/31/2018] [Accepted: 04/09/2018] [Indexed: 01/01/2023]
Abstract
Conventional biophysical and chemical biology approaches for delineating relationships between the structure and biological function of nucleic acids (NAs) abstract NAs from their native biological context. However, cumulative experimental observations have revealed that the structure, dynamics and interactions of NAs might be strongly influenced by a broad spectrum of specific and nonspecific physical-chemical environmental factors. This consideration has recently sparked interest in the development of novel tools for structural characterization of NAs in the native cellular context. Here, we review the individual methods currently being employed for structural characterization of NA structure in a native cellular environment with a focus on recent advances and developments in the emerging fields of in-cell NMR and electron paramagnetic resonance spectroscopy and in-cell single-molecule FRET of NAs.
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Affiliation(s)
- Ilektra-Chara Giassa
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Jan Rynes
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Tomas Fessl
- Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic
| | - Silvie Foldynova-Trantirkova
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic.,Institute of Biophysics, Academy of Science of the Czech Republic, Brno, Czech Republic
| | - Lukas Trantirek
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
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24
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Krylov IB, Paveliev SA, Shumakova NS, Syroeshkin MA, Shelimov BN, Nikishin GI, Terent'ev AO. Iminoxyl radicalsvs. tert-butylperoxyl radical in competitive oxidative C–O coupling with β-dicarbonyl compounds. Oxime ether formation prevails over Kharasch peroxidation. RSC Adv 2018; 8:5670-5677. [PMID: 35539576 PMCID: PMC9078167 DOI: 10.1039/c7ra13587d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 01/30/2018] [Indexed: 01/26/2023] Open
Abstract
Oxidative coupling of oxime and β-dicarbonyl compounds dominates in a β-dicarbonyl compound/oxime/Cu(ii)/t-BuOOH system; in the absence of oxime, oxidative coupling of t-BuOOH and a β-dicarbonyl compound (Kharasch peroxidation) takes place. The proposed conditions for oxidative coupling of oximes with dicarbonyl compounds require only catalytic amounts of copper salt and t-BuOOH serves as a terminal oxidant. The C–O coupling reaction proceeds via the formation of tert-butoxyl, tert-butylperoxyl and iminoxyl radicals. Apparently, tert-butylperoxyl radicals oxidize oxime into iminoxyl radical faster than they react with β-dicarbonyl compounds forming the Kharasch peroxidation product. Iminoxyl radicals are responsible for the formation of the target C–O coupling products; the yields are up to 77%. The Kharasch peroxidation system Cu(ii)cat./t-BuOOH, the source of t-BuOO˙ radicals, can be switched to generate iminoxyl radicals by adding various oximes.![]()
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Affiliation(s)
- I. B. Krylov
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
| | - S. A. Paveliev
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
| | - N. S. Shumakova
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
| | - M. A. Syroeshkin
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
| | - B. N. Shelimov
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
| | - G. I. Nikishin
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
| | - A. O. Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences
- Moscow 119991
- Russian Federation
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25
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Takahashi Y, Miura Y, Yoshioka N. Magnetic Interaction Observed in Hetero Biradical Derivatives Containing a 2,2,5,5-Tetramethylpyrrolin-1-yloxyl Unit as a Localized Spin Center. Chemphyschem 2017; 19:175-179. [DOI: 10.1002/cphc.201701274] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Yusuke Takahashi
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Youhei Miura
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Naoki Yoshioka
- Department of Applied Chemistry; Faculty of Science and Technology; Keio University; 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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26
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Shevelev GY, Gulyak EL, Lomzov AA, Kuzhelev AA, Krumkacheva OA, Kupryushkin MS, Tormyshev VM, Fedin MV, Bagryanskaya EG, Pyshnyi DV. A Versatile Approach to Attachment of Triarylmethyl Labels to DNA for Nanoscale Structural EPR Studies at Physiological Temperatures. J Phys Chem B 2017; 122:137-143. [PMID: 29206458 DOI: 10.1021/acs.jpcb.7b10689] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Triarylmethyl (trityl, TAM) radicals are a promising class of spin labels for nanometer-scale distance measurements in biomolecules at physiological temperatures. However, to date, existing approaches to site-directed TAM labeling of DNA have been limited to label attachment at the termini of oligonucleotides, thus hindering a majority of demanded applications. Herein, we report a new versatile strategy for TAM attachment at arbitrary sites of nucleic acids. It utilizes an achiral non-nucleoside phosphoramidite monomer for automated solid-phase synthesis of oligonucleotides, which are then postsynthetically functionalized with TAM. We demonstrate a synthesis of a set of oligonucleotide complexes that are TAM-labeled at internal or terminal sites, as well as the possibility of measuring interspin distances up to ∼5-6 nm at 298 K using double quantum coherence electron paramagnetic resonance (EPR). Implementation of the developed approach strongly broadens the scope of nucleic acids and nucleoprotein complexes available for nanoscale structural EPR studies at room temperatures.
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Affiliation(s)
- Georgiy Yu Shevelev
- Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Evgeny L Gulyak
- Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Alexander A Lomzov
- Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Andrey A Kuzhelev
- Novosibirsk State University , Novosibirsk 630090, Russia.,N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Olesya A Krumkacheva
- Novosibirsk State University , Novosibirsk 630090, Russia.,International Tomography Center SB RAS , Novosibirsk 630090, Russia
| | - Maxim S Kupryushkin
- Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia
| | - Victor M Tormyshev
- Novosibirsk State University , Novosibirsk 630090, Russia.,N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Matvey V Fedin
- Novosibirsk State University , Novosibirsk 630090, Russia.,International Tomography Center SB RAS , Novosibirsk 630090, Russia
| | - Elena G Bagryanskaya
- Novosibirsk State University , Novosibirsk 630090, Russia.,International Tomography Center SB RAS , Novosibirsk 630090, Russia.,N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Dmitrii V Pyshnyi
- Institute of Chemical Biology and Fundamental Medicine SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
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27
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Khramtsov VV, Bobko AA, Tseytlin M, Driesschaert B. Exchange Phenomena in the Electron Paramagnetic Resonance Spectra of the Nitroxyl and Trityl Radicals: Multifunctional Spectroscopy and Imaging of Local Chemical Microenvironment. Anal Chem 2017; 89:4758-4771. [PMID: 28363027 PMCID: PMC5513151 DOI: 10.1021/acs.analchem.6b03796] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This Feature overviews the basic principles of using stable organic radicals involved in reversible exchange processes as functional paramagnetic probes. We demonstrate that these probes in combination with electron paramagnetic resonance (EPR)-based spectroscopy and imaging techniques provide analytical tools for quantitative mapping of critical parameters of local chemical microenvironment. The Feature is written to be understandable to people who are laymen to the EPR field in anticipation of future progress and broad application of these tools in biological systems, especially in vivo, over the next years.
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Affiliation(s)
- Valery V. Khramtsov
- In Vivo Multifunctional Magnetic Resonance center, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, West Virginia 26506, United States
- Department of Biochemistry, West Virginia University School of Medicine, Morgantown, West Virginia 26506, United States
| | - Andrey A. Bobko
- In Vivo Multifunctional Magnetic Resonance center, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, West Virginia 26506, United States
- Department of Biochemistry, West Virginia University School of Medicine, Morgantown, West Virginia 26506, United States
| | - Mark Tseytlin
- In Vivo Multifunctional Magnetic Resonance center, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, West Virginia 26506, United States
- Department of Biochemistry, West Virginia University School of Medicine, Morgantown, West Virginia 26506, United States
| | - Benoit Driesschaert
- In Vivo Multifunctional Magnetic Resonance center, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, West Virginia 26506, United States
- Department of Biochemistry, West Virginia University School of Medicine, Morgantown, West Virginia 26506, United States
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28
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Audran G, Bagryanskaya EG, Brémond P, Edeleva MV, Marque SRA, Parkhomenko DA, Rogozhnikova OY, Tormyshev VM, Tretyakov EV, Trukhin DV, Zhivetyeva SI. Trityl-based alkoxyamines as NMP controllers and spin-labels. Polym Chem 2016; 7:6490-6499. [PMID: 28989533 PMCID: PMC5627662 DOI: 10.1039/c6py01303a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, new applications of trityl-nitroxide biradicals were proposed. In the present study, attachment of a trityl radical to alkoxyamines was performed for the first time. The rate constants kd of C-ON bond homolysis in these alkoxyamines were measured and found to be equal to those for alkoxyamines without trityl. The electron paramagnetic resonance (EPR) spectra of the products of alkoxyamine homolysis (trityl-TEMPO and trityl-SG1 biradicals) were recorded, and the corresponding exchange interactions were estimated. The decomposition of trityl-alkoxyamine showed more than an 80% yield of biradicals, meaning that the C-ON bond homolysis is the main reaction. The suitability of these labelled initiators/controllers for polymerisation was exemplified by means of successful nitroxide-mediated polymerisation (NMP) of styrene. Thus, this is the first report of a spin-labelled alkoxyamine suitable for NMP.
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Affiliation(s)
- Gérard Audran
- Aix-Marseille Univ, CNRS, ICR, UMR 7273, case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20 France
| | - Elena G. Bagryanskaya
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Paul Brémond
- Aix-Marseille Univ, CNRS, ICR, UMR 7273, case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20 France
| | - Mariya V. Edeleva
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
| | - Sylvain R. A. Marque
- Aix-Marseille Univ, CNRS, ICR, UMR 7273, case 551, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20 France
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
| | - Dmitriy A. Parkhomenko
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
| | - Olga Yu. Rogozhnikova
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Victor M. Tormyshev
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Evgeny V. Tretyakov
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
| | - Dmitry V. Trukhin
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Svetlana I. Zhivetyeva
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS. 9, Lavrentjev Ave, Novosibirsk 630090, Russia
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29
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Kuzhelev AA, Shevelev GY, Krumkacheva OA, Tormyshev VM, Pyshnyi DV, Fedin MV, Bagryanskaya EG. Saccharides as Prospective Immobilizers of Nucleic Acids for Room-Temperature Structural EPR Studies. J Phys Chem Lett 2016; 7:2544-8. [PMID: 27320083 PMCID: PMC5453311 DOI: 10.1021/acs.jpclett.6b01024] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Pulsed dipolar electron paramagnetic resonance (EPR) spectroscopy is a powerful tool for structural studies of biomolecules and their complexes. This method, whose applicability has been recently extended to room temperatures, requires immobilization of the studied biosystem to prevent averaging of dipolar couplings; at the same time, the modification of native conformations by immobilization must be avoided. In this work, we provide first demonstration of room-temperature EPR distance measurements in nucleic acids using saccharides trehalose, sucrose, and glucose as immobilizing media. We propose an approach that keeps structural conformation and unity of immobilized double-stranded DNA. Remarkably, room-temperature electron spin dephasing time of triarylmethyl-labeled DNA in trehalose is noticeably longer compared to previously used immobilizers, thus providing a broader range of available distances. Therefore, saccharides, and especially trehalose, can be efficiently used as immobilizers of nucleic acids, mimicking native conditions and allowing wide range of structural EPR studies at room temperatures.
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Affiliation(s)
- Andrey A. Kuzhelev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Georgiy Yu. Shevelev
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Olesya A. Krumkacheva
- International Tomography Center SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Victor M. Tormyshev
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Dmitrii V. Pyshnyi
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Matvey V. Fedin
- International Tomography Center SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
| | - Elena G. Bagryanskaya
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Novosibirsk 630090, Russia
- Novosibirsk State University, Novosibirsk 630090, Russia
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30
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Babaylova ES, Malygin AA, Lomzov AA, Pyshnyi DV, Yulikov M, Jeschke G, Krumkacheva OA, Fedin MV, Karpova GG, Bagryanskaya EG. Complementary-addressed site-directed spin labeling of long natural RNAs. Nucleic Acids Res 2016; 44:7935-43. [PMID: 27269581 PMCID: PMC5027493 DOI: 10.1093/nar/gkw516] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 05/30/2016] [Indexed: 12/21/2022] Open
Abstract
Nanoscale distance measurements by pulse dipolar Electron paramagnetic resonance (EPR) spectroscopy allow new insights into the structure and dynamics of complex biopolymers. EPR detection requires site directed spin labeling (SDSL) of biomolecule(s), which remained challenging for long RNAs up-to-date. Here, we demonstrate that novel complementary-addressed SDSL approach allows efficient spin labeling and following structural EPR studies of long RNAs. We succeeded to spin-label Hepatitis C Virus RNA internal ribosome entry site consisting of ≈330 nucleotides and having a complicated spatial structure. Application of pulsed double electron–electron resonance provided spin–spin distance distribution, which agrees well with the results of molecular dynamics (MD) calculations. Thus, novel SDSL approach in conjunction with EPR and MD allows structural studies of long natural RNAs with nanometer resolution and can be applied to systems of biological and biomedical significance.
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Affiliation(s)
- Elena S Babaylova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexey A Malygin
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk 630090, Russia
| | - Alexander A Lomzov
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk 630090, Russia
| | - Dmitrii V Pyshnyi
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk 630090, Russia
| | - Maxim Yulikov
- Laboratory of Physical Chemistry, ETH Zurich, Zurich 8093, Switzerland
| | - Gunnar Jeschke
- Laboratory of Physical Chemistry, ETH Zurich, Zurich 8093, Switzerland
| | - Olesya A Krumkacheva
- Novosibirsk State University, Novosibirsk 630090, Russia International Tomography Center SB RAS, Novosibirsk 630090, Russia
| | - Matvey V Fedin
- Novosibirsk State University, Novosibirsk 630090, Russia International Tomography Center SB RAS, Novosibirsk 630090, Russia
| | - Galina G Karpova
- Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk 630090, Russia Novosibirsk State University, Novosibirsk 630090, Russia
| | - Elena G Bagryanskaya
- Novosibirsk State University, Novosibirsk 630090, Russia N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Novosibirsk 630090, Russia
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31
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Lomzov AA, Sviridov EA, Shernuykov AV, Shevelev GY, Pyshnyi DV, Bagryanskaya EG. Study of a DNA Duplex by Nuclear Magnetic Resonance and Molecular Dynamics Simulations. Validation of Pulsed Dipolar Electron Paramagnetic Resonance Distance Measurements Using Triarylmethyl-Based Spin Labels. J Phys Chem B 2016; 120:5125-33. [PMID: 27195671 DOI: 10.1021/acs.jpcb.6b03193] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pulse dipole-dipole electron paramagnetic resonance (EPR) spectroscopy (double electron-electron resonance [DEER] or pulse electron-electron double resonance [PELDOR] and double quantum coherence [DQC]) allows for measurement of distances in biomolecules and can be used at low temperatures in a frozen solution. Recently, the possibility of distance measurement in a nucleic acid at a physiological temperature using pulse EPR was demonstrated. In these experiments, triarylmethyl (TAM) radicals with long memory time of the electron spin served as a spin label. In addition, the duplex was immobilized on modified silica gel particles (Nucleosil DMA); this approach enables measurement of interspin distances close to 4.5 nm. Nevertheless, the possible influence of TAM on the structure of a biopolymer under study and validity of the data obtained by DQC are debated. In this paper, a combination of molecular dynamics (MD) and nuclear magnetic resonance (NMR) methods was used for verification of interspin distances measured by the X-band DQC method. NMR is widely used for structural analysis of biomolecules under natural conditions (room temperature and an aqueous solution). The ultraviolet (UV) melting method and thermal series (1)H NMR in the range 5-95 °C revealed the presence of only the DNA duplex in solution at oligonucleotide concentrations 1 μM to 1.1 mM at temperatures below 40 °C. The duplex structures and conformation flexibility of native and TAM-labeled DNA complexes obtained by MD simulation were the same as the structure obtained by NMR refinement. Thus, we showed that distance measurements at physiological temperatures by the X-band DQC method allow researchers to obtain valid structural information on an unperturbed DNA duplex using terminal TAM spin labels.
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Affiliation(s)
- Alexander A Lomzov
- Institute of Chemical Biology and Fundamental Medicine, SB RAS , 8 Lavrentiev Avenue, Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Eugeniy A Sviridov
- Novosibirsk State University , Novosibirsk 630090, Russia.,N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, SB RAS , 9 Lavrentiev Avenue, Novosibirsk 630090, Russia
| | - Andrey V Shernuykov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, SB RAS , 9 Lavrentiev Avenue, Novosibirsk 630090, Russia
| | - Georgiy Yu Shevelev
- Institute of Chemical Biology and Fundamental Medicine, SB RAS , 8 Lavrentiev Avenue, Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Dmitrii V Pyshnyi
- Institute of Chemical Biology and Fundamental Medicine, SB RAS , 8 Lavrentiev Avenue, Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Elena G Bagryanskaya
- Novosibirsk State University , Novosibirsk 630090, Russia.,N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, SB RAS , 9 Lavrentiev Avenue, Novosibirsk 630090, Russia
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32
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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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33
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Audran G, Bosco L, Brémond P, Butscher T, Franconi JM, Kabitaev K, Marque SRA, Mellet P, Parzy E, Santelli M, Thiaudière E, Viel S. β-Phosphorus hyperfine coupling constant in nitroxides: 5. Solvent effect. RSC Adv 2016. [DOI: 10.1039/c5ra23521a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
a
N and aP of β-phosphorylated 5-membered ring nitroxides are sensitive to the polarity/polarisability π*, the structuredness of the solvent c, and to the hydrogen bond donating α properties of the solvent.
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