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Pradhan BL, Lodhi L, Dey KK, Ghosh M. Analyzing atomic scale structural details and nuclear spin dynamics of four macrolide antibiotics: erythromycin, clarithromycin, azithromycin, and roxithromycin. RSC Adv 2024; 14:17733-17770. [PMID: 38832242 PMCID: PMC11145140 DOI: 10.1039/d4ra00718b] [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: 01/28/2024] [Accepted: 05/26/2024] [Indexed: 06/05/2024] Open
Abstract
The current investigation centers on elucidating the intricate molecular architecture and dynamic behavior of four macrolide antibiotics, specifically erythromycin, clarithromycin, azithromycin, and roxithromycin, through the application of sophisticated solid-state nuclear magnetic resonance (SSNMR) methodologies. We have measured the principal components of chemical shift anisotropy (CSA) parameters, and the site-specific spin-lattice relaxation time at carbon nuclei sites. To extract the principal components of CSA parameters, we have employed 13C 2DPASS CP-MAS SSNMR experiments at two different values of magic angle spinning (MAS) frequencies, namely 2 kHz and 600 Hz. Additionally, the spatial correlation between 13C and 1H nuclei has been investigated using 1H-13C frequency switched Lee-Goldburg heteronuclear correlation (FSLGHETCOR) experiment at a MAS frequency of 24 kHz. Our findings demonstrate that the incorporation of diverse functional groups, such as the ketone group and oxime group with the lactone ring, exerts notable influences on the structure and dynamics of the macrolide antibiotic. In particular, we have observed a significant decrease in the spin-lattice relaxation time of carbon nuclei residing on the lactone ring, desosamine, and cladinose in roxithromycin, compared to erythromycin. Overall, our findings provide detailed insight into the relationship between the structure and dynamics of macrolide antibiotics, which is eventually correlated with their biological activity. This knowledge can be utilized to develop new and more effective drugs by providing a rational basis for drug discovery and design.
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Affiliation(s)
- Bijay Laxmi Pradhan
- Physics Section, Mahila Maha Vidyalaya, Banaras Hindu University Varanasi-221005 Uttar-Pradesh India
- Department of Physics, Institute of Science, Banaras Hindu University Varanasi-221005 Uttar-Pradesh India
| | - Lekhan Lodhi
- Department of Zoology, Dr Harisingh Gour Central University Sagar-470003 Madhya-Pradesh India
| | - Krishna Kishor Dey
- Department of Physics, Dr Harisingh Gour Central University Sagar-470003 Madhya-Pradesh India
| | - Manasi Ghosh
- Physics Section, Mahila Maha Vidyalaya, Banaras Hindu University Varanasi-221005 Uttar-Pradesh India
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2
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Kurle-Tucholski P, Wiebeler C, Köhler L, Qin R, Zhao Z, Šimėnas M, Pöppl A, Matysik J. Red Shift in the Absorption Spectrum of Phototropin LOV1 upon the Formation of a Semiquinone Radical: Reconstructing the Orbital Architecture. J Phys Chem B 2024; 128:4344-4353. [PMID: 38688080 PMCID: PMC11089501 DOI: 10.1021/acs.jpcb.4c00397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 03/22/2024] [Accepted: 04/17/2024] [Indexed: 05/02/2024]
Abstract
Flavin mononucleotide (FMN) is a ubiquitous blue-light pigment due to its ability to drive one- and two-electron transfer reactions. In both light-oxygen-voltage (LOV) domains of phototropin from the green algae Chlamydomonas reinhardtii, FMN is noncovalently bound. In the LOV1 cysteine-to-serine mutant (C57S), light-induced electron transfer from a nearby tryptophan occurs, and a transient spin-correlated radical pair (SCRP) is formed. Within this photocycle, nuclear hyperpolarization is created by the solid-state photochemically induced dynamic nuclear polarization (photo-CIDNP) effect. In a side reaction, a stable protonated semiquinone radical (FMNH·) forms undergoing a significant bathochromic shift of the first electronic transition from 445 to 591 nm. The incorporation of phototropin LOV1-C57S into an amorphous trehalose matrix, stabilizing the radical, allows for application of various magnetic resonance experiments at ambient temperatures, which are combined with quantum-chemical calculations. As a result, the bathochromic shift of the first absorption band is explained by lifting the degeneracy of the molecular orbital energy levels for electrons with alpha and beta spins in FMNH· due to the additional electron.
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Affiliation(s)
- Patrick Kurle-Tucholski
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstraße
3, D-04103 Leipzig, Germany
| | - Christian Wiebeler
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstraße
3, D-04103 Leipzig, Germany
- Institut
für Physik, Universität Augsburg, Universitätsstraße 1, D-86159 Augsburg, Germany
| | - Lisa Köhler
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstraße
3, D-04103 Leipzig, Germany
| | - Ruonan Qin
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstraße
3, D-04103 Leipzig, Germany
| | - Ziyue Zhao
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstraße
3, D-04103 Leipzig, Germany
| | - Mantas Šimėnas
- Faculty
of Physics, Vilnius University, Sauletekio 3, LT-10257 Vilnius, Lithuania
| | - Andreas Pöppl
- Felix
Bloch Institute for Solid State Physics, Universität Leipzig, Linnéstraße 5, D-04103, Leipzig, Germany
| | - Jörg Matysik
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstraße
3, D-04103 Leipzig, Germany
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3
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Mao J, Jin X, Shi M, Heidenreich D, Brown LJ, Brown RCD, Lelli M, He X, Glaubitz C. Molecular mechanisms and evolutionary robustness of a color switch in proteorhodopsins. SCIENCE ADVANCES 2024; 10:eadj0384. [PMID: 38266078 PMCID: PMC10807816 DOI: 10.1126/sciadv.adj0384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Accepted: 12/22/2023] [Indexed: 01/26/2024]
Abstract
Proteorhodopsins are widely distributed photoreceptors from marine bacteria. Their discovery revealed a high degree of evolutionary adaptation to ambient light, resulting in blue- and green-absorbing variants that correlate with a conserved glutamine/leucine at position 105. On the basis of an integrated approach combining sensitivity-enhanced solid-state nuclear magnetic resonance (ssNMR) spectroscopy and linear-scaling quantum mechanics/molecular mechanics (QM/MM) methods, this single residue is shown to be responsible for a variety of synergistically coupled structural and electrostatic changes along the retinal polyene chain, ionone ring, and within the binding pocket. They collectively explain the observed color shift. Furthermore, analysis of the differences in chemical shift between nuclei within the same residues in green and blue proteorhodopsins also reveals a correlation with the respective degree of conservation. Our data show that the highly conserved color change mainly affects other highly conserved residues, illustrating a high degree of robustness of the color phenotype to sequence variation.
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Affiliation(s)
- Jiafei Mao
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Straße 9, 60438 Frankfurt am Main, Germany
| | - Xinsheng Jin
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China
| | - Man Shi
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China
| | - David Heidenreich
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Straße 9, 60438 Frankfurt am Main, Germany
| | - Lynda J. Brown
- Department of Chemistry, University of Southampton, Southampton, SO17 1BJ UK
| | - Richard C. D. Brown
- Department of Chemistry, University of Southampton, Southampton, SO17 1BJ UK
| | - Moreno Lelli
- Department of Chemistry “Ugo Schiff” and Magnetic Resonance Center (CERM), University of Florence, Via della Lastruccia 3, Sesto Fiorentino, 50019 Italy
- Consorzio Interuniversitario Risonanze Magnetiche MetalloProteine (CIRMMP), Via Luigi Sacconi 6, Sesto Fiorentino, 50019 Italy
| | - Xiao He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China
- New York University–East China Normal University Center for Computational Chemistry, New York University Shanghai, Shanghai, 200062, China
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Straße 9, 60438 Frankfurt am Main, Germany
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4
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Tao W, Yu W, Zou X, Chen W. Machine learning assisted interpretation of 2D solid-state nuclear magnetic resonance spectra. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 353:107492. [PMID: 37302236 DOI: 10.1016/j.jmr.2023.107492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/22/2023] [Accepted: 05/25/2023] [Indexed: 06/13/2023]
Abstract
A machine learning methodology using deep neural network (DNN) for interpreting multidimensional solid-state nuclear magnetic resonance (SSNMR) of various synthetic and natural polymers is presented. The separated local field (SLF) SSNMR which correlates local well-defined heteronuclear dipolar with the tensor orientation of the chemical shift anisotropy (CSA) of spin in the solid state can provide valuable structure and molecular dynamics information of synthetic and biopolymers. Compared with the traditional linear least-square fitting, the proposed DNN-based methodology can efficiently and accurately determine the tensor orientation of CSA of both 13C and 15N in all four samples. The method achieves prediction precisions of the Euler angles with < ±5° and is characterized by low training costs and high efficiency (<1 s). The feasibility and robustness of the DNN-based analysis methodology are confirmed by comparison to reported-literature values. This strategy is expected to aid in the interpretation of complex multidimensional NMR spectra of complicated polymer system.
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Affiliation(s)
- Wei Tao
- National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Wancheng Yu
- National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Xiangyu Zou
- Department of Accelerator Science and Engineering Physics, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
| | - Wei Chen
- National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China; Department of Accelerator Science and Engineering Physics, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China.
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5
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Pradhan B, Yadav JP, Lodhi L, Sen P, Dey KK, Ghosh M. Atomic-Scale Resolution Insights into Structural and Dynamic Differences between Ofloxacin and Levofloxacin. ACS OMEGA 2023; 8:24093-24105. [PMID: 37426250 PMCID: PMC10323956 DOI: 10.1021/acsomega.3c03406] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023]
Abstract
This study employs advanced solid-state NMR techniques to investigate the atomic-level structure and dynamics of two enantiomers: ofloxacin and levofloxacin. The investigation focuses on critical attributes, such as the principal components of the chemical shift anisotropy (CSA) tensor, the spatial proximity of 1H and 13C nuclei, and site-specific 13C spin-lattice relaxation time, to reveal the local electronic environment surrounding specific nuclei. Levofloxacin, the levo-isomer of ofloxacin, exhibits higher antibiotic efficacy than its counterpart, and the dissimilarities in the CSA parameters indicate significant differences in the local electronic configuration and nuclear spin dynamics between the two enantiomers. Additionally, the study employs the 1H-13C frequency-switched Lee-Goldburg heteronuclear correlation (FSLGHETCOR) experiment to identify the presence of heteronuclear correlations between specific nuclei (C15 and H7 nuclei and C13 and H12 nuclei) in ofloxacin but not in levofloxacin. These observations offer insights into the link between bioavailability and nuclear spin dynamics, underscoring the significance of NMR crystallography approaches in advanced drug design.
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Affiliation(s)
- Bijay
Laxmi Pradhan
- Department
of Physics, Institute of Science, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
| | - Jai Prakash Yadav
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
| | - Lekhan Lodhi
- Department
of Zoology, Dr. Harisingh Gour Central University, Sagar 470003, Madhya-Pradesh, India
| | - Prince Sen
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya-Pradesh, India
| | - Krishna Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya-Pradesh, India
| | - Manasi Ghosh
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
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6
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Köhler L, Gärtner W, Salvan G, Matysik J, Wiebeler C, Song C. Photocycle of a cyanobacteriochrome: a charge defect on ring C impairs conjugation in chromophore. Chem Sci 2023; 14:6295-6308. [PMID: 37325146 PMCID: PMC10266455 DOI: 10.1039/d3sc00636k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 05/09/2023] [Indexed: 06/17/2023] Open
Abstract
A large number of novel phytochromes named cyanobacteriochromes (CBCRs) have been recently identified. CBCRs appear to be attractive for further in-depth studies as paradigms for phytochromes because of their related photochemistry, but simpler domain architecture. Elucidating the mechanisms of spectral tuning for the bilin chromophore down to the molecular/atomic level is a prerequisite to design fine-tuned photoswitches for optogenetics. Several explanations for the blue shift during photoproduct formation associated with the red/green CBCRs represented by Slr1393g3 have been developed. There are, however, only sparse mechanistic data concerning the factors controlling stepwise absorbance changes along the reaction pathways from the dark state to the photoproduct and vice versa in this subfamily. Conventional cryotrapping of photocycle intermediates of phytochromes has proven experimentally intractable for solid-state NMR spectroscopy within the probe. Here, we have developed a simple method to circumvent this hindrance by incorporating proteins into trehalose glasses which allows four photocycle intermediates of Slr1393g3 to be isolated for NMR use. In addition to identifying the chemical shifts and chemical shift anisotropy principal values of selective chromophore carbons in various photocycle states, we generated QM/MM models of the dark state and photoproduct as well as of the primary intermediate of the backward-reaction. We find the motion of all three methine bridges in both reaction directions but in different orders. These molecular events channel light excitation to drive distinguishable transformation processes. Our work also suggests that polaronic self-trapping of a conjugation defect by displacement of the counterion during the photocycle would play a role in tuning the spectral properties of both the dark state and photoproduct.
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Affiliation(s)
- Lisa Köhler
- Institut für Analytische Chemie, Universität Leipzig 04103 Leipzig Germany
| | - Wolfgang Gärtner
- Institut für Analytische Chemie, Universität Leipzig 04103 Leipzig Germany
| | - Georgeta Salvan
- Institut für Physik, Technische Universität Chemnitz 09126 Chemnitz Germany
| | - Jörg Matysik
- Institut für Analytische Chemie, Universität Leipzig 04103 Leipzig Germany
| | - Christian Wiebeler
- Institut für Analytische Chemie, Universität Leipzig 04103 Leipzig Germany
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig 04103 Leipzig Germany
| | - Chen Song
- Institut für Analytische Chemie, Universität Leipzig 04103 Leipzig Germany
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7
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Atterberry BA, Wimmer E, Estes DP, Rossini AJ. Acceleration of indirect detection 195Pt solid-state NMR experiments by sideband selective excitation or alternative indirect sampling schemes. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2023; 352:107457. [PMID: 37163927 DOI: 10.1016/j.jmr.2023.107457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/27/2023] [Accepted: 04/12/2023] [Indexed: 05/12/2023]
Abstract
The measurement of the of chemical shift (CS) tensors via solid-state NMR (ssNMR) spectroscopy has proven to be a powerful probe of structure for organic molecules, biomolecules, and inorganic materials. However, when measuring the NMR spectra of heavy spin-1/2 isotopes the chemical shift anisotropy (CSA) is commonly on the order of thousands of parts per million, which makes acquisition of NMR spectra difficult due to the low NMR sensitivity imposed by the breadth of the signals and challenges in uniformly exciting the NMR spectrum. We have recently shown that complete 195Pt NMR spectra could be rapidly measured by using 195Pt saturation or excitation selective long pulses (SLP) with multiple rotor-cycle durations and RF fields less than 50 kHz into 1H{195Pt} or 1H-31P{195Pt} PE S-RESPDOR, TONE D-HMQC-4, J-resolved, and J-HMQC pulse sequences. The SLP only provide signal or dephasing when they are applied on resonance with a spinning sideband. The magic angle spinning 195Pt NMR spectrum is reconstructed in the sideband selective NMR experiments by acquiring 1D NMR spectra at variable 195Pt pulse offsets. In this work, we present a detailed investigation of the specific pulse conditions required for the ideal performance of sideband selective experiments. Sideband selective experiments are shown to be able to accurately reproduce MAS NMR spectra with minimal distortions of relative sideband intensities. It is also demonstrated that a 195Pt NMR spectrum indirectly detected with HMQC can be rapidly obtained by acquiring a single rotor cycle of indirect dimension evolution points. We dub this method One Rotor Cycle of Acquisition (ORCA) HMQC. Sideband selective experiments and ORCA HMQC experiments are shown to provide a one order of magnitude improvement in experiment times as compared to conventional wideline HMQC experiments.
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Affiliation(s)
- Benjamin A Atterberry
- US DOE Ames National Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA
| | - Erik Wimmer
- University of Stuttgart, Department of Chemistry, Stuttgart, Baden-Württemberg, 70569, Germany
| | - Deven P Estes
- University of Stuttgart, Department of Chemistry, Stuttgart, Baden-Württemberg, 70569, Germany
| | - Aaron J Rossini
- US DOE Ames National Laboratory, Ames, IA 50011, USA; Iowa State University, Department of Chemistry, Ames, IA 50011, USA.
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8
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Morales-Melgares A, Casar Z, Moutzouri P, Venkatesh A, Cordova M, Kunhi Mohamed A, Scrivener KL, Bowen P, Emsley L. Atomic-Level Structure of Zinc-Modified Cementitious Calcium Silicate Hydrate. J Am Chem Soc 2022; 144:22915-22924. [PMID: 36508687 PMCID: PMC9782795 DOI: 10.1021/jacs.2c06749] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
It has recently been demonstrated that the addition of zinc can enhance the mechanical strength of tricalcium silicates (C3S) upon hydration, but the structure of the main hydration product of cement, calcium silicate hydrate (C-S-H), in zinc-modified formulations remains unresolved. Here, we combine 29Si DNP-enhanced solid-state nuclear magnetic resonance (NMR), density functional theory (DFT)-based chemical shift computations, and molecular dynamics (MD) modeling to determine the atomic-level structure of zinc-modified C-S-H. The structure contains two main new silicon species (Q(1,Zn) and Q(2p,Zn)) where zinc substitutes Q(1) silicon species in dimers and bridging Q(2b) silicon sites, respectively. Structures determined as a function of zinc content show that zinc promotes an increase in the dreierketten mean chain lengths.
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Affiliation(s)
- Anna Morales-Melgares
- Laboratory
of Magnetic Resonance, Institut des Sciences et Ingénierie
Chimiques, Ecole Polytechnique Fédérale
de Lausanne (EPFL), CH-1015Lausanne, Switzerland,Laboratory
of Construction Materials, Institut des Matériaux, Ecole Polytechnique Fédérale de Lausanne
(EPFL), CH-1015Lausanne, Switzerland
| | - Ziga Casar
- Laboratory
of Construction Materials, Institut des Matériaux, Ecole Polytechnique Fédérale de Lausanne
(EPFL), CH-1015Lausanne, Switzerland
| | - Pinelopi Moutzouri
- Laboratory
of Magnetic Resonance, Institut des Sciences et Ingénierie
Chimiques, Ecole Polytechnique Fédérale
de Lausanne (EPFL), CH-1015Lausanne, Switzerland
| | - Amrit Venkatesh
- Laboratory
of Magnetic Resonance, Institut des Sciences et Ingénierie
Chimiques, Ecole Polytechnique Fédérale
de Lausanne (EPFL), CH-1015Lausanne, Switzerland
| | - Manuel Cordova
- Laboratory
of Magnetic Resonance, Institut des Sciences et Ingénierie
Chimiques, Ecole Polytechnique Fédérale
de Lausanne (EPFL), CH-1015Lausanne, Switzerland
| | - Aslam Kunhi Mohamed
- Institute
for Building Materials, Department of Civil, Environmental and Geomatic
Engineering, ETH Zürich, CH-8093Zürich, Switzerland
| | - Karen L. Scrivener
- Laboratory
of Construction Materials, Institut des Matériaux, Ecole Polytechnique Fédérale de Lausanne
(EPFL), CH-1015Lausanne, Switzerland,
| | - Paul Bowen
- Laboratory
of Construction Materials, Institut des Matériaux, Ecole Polytechnique Fédérale de Lausanne
(EPFL), CH-1015Lausanne, Switzerland,
| | - Lyndon Emsley
- Laboratory
of Magnetic Resonance, Institut des Sciences et Ingénierie
Chimiques, Ecole Polytechnique Fédérale
de Lausanne (EPFL), CH-1015Lausanne, Switzerland,
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9
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Yadav JP, Lodhi L, Fatma T, Dey KK, Ghosh M. Investigation of the Influence of Various Functional Groups on the Dynamics of Glucocorticoids. ACS OMEGA 2022; 7:43190-43209. [PMID: 36467925 PMCID: PMC9713872 DOI: 10.1021/acsomega.2c05892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 11/02/2022] [Indexed: 06/17/2023]
Abstract
The basic configuration of glucocorticoid consists of four-fused rings associated with one cyclohexadienone ring, two cyclohexane rings, and one cyclopentane ring. The ways the structure and dynamics of five glucocorticoids (prednisone, prednisolone, prednisolone acetate, methylprednisolone, and methylprednisolone acetate) are altered because of the substitution of various functional groups with these four-fused rings are studied thoroughly by applying sophisticated solid-state nuclear magnetic resonance (NMR) methodologies. The biological activities of these glucocorticoids are also changed because of the attachment of various functional groups with these four-fused rings. The substitution of the hydroxyl group (with the C11 atom of the cyclohexane ring) in place of the keto group enhances the potential of the glucocorticoid to cross the cellular membrane. As a result, the bioavailability of prednisolone (the hydroxyl group is attached with the C11 atom of the cyclohexane ring) is increased compared to prednisone (the keto group is attached with the C11 atom of cyclohexane rings). Another notable point is that the spin-lattice relaxation rate at crystallographically distinct carbon nuclei sites of prednisolone is increased compared to that of the prednisone, which implies that the motional degrees of freedom of glucocorticoid is increased because of the substitution of the hydroxyl group in place of the keto group of the cyclohexane ring. The attachment of the methyl group with the C6 atom of cyclohexane rings further reduces the spin-lattice relaxation time at crystallographically distinct carbon nuclei sites of glucocorticoid and its bioactivity is also increased. By comparing the spin-lattice relaxation time and the local correlation time at crystallographically different carbon nuclei sites of three steroids prednisone, prednisolone, and methylprednisolone, it is observed that both the spin-lattice relaxation time and the local correlation time gradually decrease at each crystallographically distinct carbon nuclei sites when we move from prednisone to prednisolone to methyl-prednisolone. On the other hand, if we compare the same for prednisolone, prednisolone acetate, and methylprednisolone acetate, then we also observe that both the spin-lattice relaxation time and the local-correlation time gradually decrease from prednisolone to prednisolone acetate to methylprednisolone acetate for all chemically different carbon nuclei. It is also noticeable that both the spin-lattice relaxation time and the local-correlation time gradually decrease from prednisone to prednisolone to prednisolone acetate to methylprednisolone to methylprednisolone acetate for most of the carbon nuclei sites. From in silico analysis, it is also revealed that the bioavailability and efficacy of the glucocorticoid increase from prednisone to prednisolone to prednisolone acetate to methylprednisolone to methylprednisolone acetate. Hence, it can be concluded that the biological activity and the motional degrees of freedom of the glucocorticoids are highly correlated. These types of studies provide a clear picture of the structure-activity relationship of the drug molecules, which will enlighten the path of developing highly potent glucocorticoids with minimum side effects. Another important aspect of these types of studies is to provide information about the electronics configuration and nuclear spin dynamics at crystallographically different carbon nuclei sites of five glucocorticoids, which will enrich the field of "NMR crystallography".
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Affiliation(s)
- Jai Prakash Yadav
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi, Uttar Pradesh221005, India
| | - Lekhan Lodhi
- Department
of Zoology, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh470003, India
| | - Tamseel Fatma
- Department
of Bioinformatics, Mahila Maha Vidyalaya, Banaras Hindu University, Varanasi, Uttar Pradesh221005, India
| | - Krishna Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh470003, India
| | - Manasi Ghosh
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi, Uttar Pradesh221005, India
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10
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Miao LP, Ding N, Wang N, Shi C, Ye HY, Li L, Yao YF, Dong S, Zhang Y. Direct observation of geometric and sliding ferroelectricity in an amphidynamic crystal. NATURE MATERIALS 2022; 21:1158-1164. [PMID: 35927433 DOI: 10.1038/s41563-022-01322-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/24/2022] [Indexed: 06/15/2023]
Abstract
Sliding ferroelectricity is a recently observed polarity existing in two-dimensional materials. However, due to the weak polarization and poor electrical insulation in these materials, existing experimental evidences are indirect and mostly based on nanoscale transport properties or piezoresponse force microscopy. We report the direct observation of sliding ferroelectricity, using a high-quality amphidynamic single crystal (15-crown-5)Cd3Cl6, which possesses a large bandgap and so allows direct measurement of polarization-electric field hysteresis. This coordination polymer is a van der Waals material, which is composed of inorganic stators and organic rotators as determined by X-ray diffraction and NMR characterization. From density functional theory calculations, we find that after freezing the rotators, an electric dipole is generated in each layer driven by the geometric mechanism, while a comparable ferroelectric polarization originates from the interlayer sliding. The net polarization of these two components can be directly measured and manipulated. Our finding provides insight into low-dimensional ferroelectrics, especially control of the synchronous dynamics of rotating molecules and sliding layers in solids.
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Affiliation(s)
- Le-Ping Miao
- Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, China
- Chaotic Matter Science Research Center, Department of Materials, Metallurgy and Chemistry & Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou, China
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing, China
| | - Ning Ding
- School of Physics, Southeast University, Nanjing, China
| | - Na Wang
- Chaotic Matter Science Research Center, Department of Materials, Metallurgy and Chemistry & Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou, China
| | - Chao Shi
- Chaotic Matter Science Research Center, Department of Materials, Metallurgy and Chemistry & Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou, China
| | - Heng-Yun Ye
- Chaotic Matter Science Research Center, Department of Materials, Metallurgy and Chemistry & Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou, China
| | - Linglong Li
- School of Physics, Southeast University, Nanjing, China
| | - Ye-Feng Yao
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, China
| | - Shuai Dong
- School of Physics, Southeast University, Nanjing, China.
| | - Yi Zhang
- Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, China.
- Chaotic Matter Science Research Center, Department of Materials, Metallurgy and Chemistry & Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou, China.
- Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing, China.
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11
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Zheng Y, Kafle N, Schwarz D, Eagan JM, Hayano S, Nakama Y, Pan P, Miyoshi T. Asymmetric Molecular Dynamics and Anisotropic Phase Separation in the Cocrystal of the Crystalline/Crystalline Polymer Blend. ACS Macro Lett 2022; 11:193-198. [PMID: 35574768 DOI: 10.1021/acsmacrolett.1c00745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Semicrystalline polymers are categorized as either mobile or fixed crystals, depending on chain mobility in the crystalline region. In this work, we investigate molecular dynamics and phase structure in the cocrystal consisting of fixed and mobile polymer crystals by solid-state (ss) nuclear magnetic resonance (NMR) spectroscopy. It is demonstrated that (i) the mobile component begins large amplitude motions associated with crystal-crystal transition, while fixed ones keep their rigidity in the cocrystal, and (ii) asymmetric molecular dynamics leads to nanosegregations into mobile- and fixed-rich domains in the cocrystal below the melting temperature (Tm). The observed phase separation induced by asymmetric molecular dynamics is similar to the phase separation of the miscible amorphous polymer blend; however, it is limited to two dimensions due to the parallel packing of the stems inside the cocrystal, as well as chain connectivity at the crystalline-amorphous boundary.
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Affiliation(s)
- Ying Zheng
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
- Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, China
| | - Navin Kafle
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Derek Schwarz
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - James M. Eagan
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Shigetaka Hayano
- Zeon Corporation R&D Center, 1-2-1 Yako, Kawasaki-ward, Kawasaki City, Kanagawa Prefecture 210-9507, Japan
| | - Yuki Nakama
- Zeon Corporation R&D Center, 1-2-1 Yako, Kawasaki-ward, Kawasaki City, Kanagawa Prefecture 210-9507, Japan
| | - Pengju Pan
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
- Institute of Zhejiang University-Quzhou, 78 Jiuhua Boulevard North, Quzhou 324000, China
| | - Toshikazu Miyoshi
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
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12
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He C, Li S, Xiao Y, Xu J, Deng F. Application of solid-state NMR techniques for structural characterization of metal-organic frameworks. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2022; 117:101772. [PMID: 35016011 DOI: 10.1016/j.ssnmr.2022.101772] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 12/27/2021] [Accepted: 01/03/2022] [Indexed: 06/14/2023]
Abstract
Solid-state NMR can afford the structural information about the chemical composition, local environment, and spatial coordination at the atomic level, which has been extensively applied to characterize the detailed structure and host-guest interactions in metal-organic frameworks (MOFs). In this review, recent advances for the structural characterizations of MOFs using versatile solid-state NMR techniques were briefly introduced. High-field sensitivity-enhanced solid-state NMR method enabled the direct observation of metal centers in MOFs containing low-γ nuclei. Two-dimensional (2D) homo- and hetero-nuclear correlation MAS NMR experiments provided the spatial proximity among linkers, metal clusters and the introduced guest molecules. Moreover, quantitative measurement of inter-nuclear distances using solid-state NMR provided valuable structural information about the connectivity geometry as well as the host-guest interactions within MOFs. Furthermore, solid-state NMR has exhibited great potential for unraveling the structure property of MOFs containing paramagnetic metal centers.
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Affiliation(s)
- Caiyan He
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Shenhui Li
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
| | - Yuqing Xiao
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jun Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Feng Deng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
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13
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Liang L, Ji Y, Chen K, Gao P, Zhao Z, Hou G. Solid-State NMR Dipolar and Chemical Shift Anisotropy Recoupling Techniques for Structural and Dynamical Studies in Biological Systems. Chem Rev 2022; 122:9880-9942. [PMID: 35006680 DOI: 10.1021/acs.chemrev.1c00779] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
With the development of NMR methodology and technology during the past decades, solid-state NMR (ssNMR) has become a particularly important tool for investigating structure and dynamics at atomic scale in biological systems, where the recoupling techniques play pivotal roles in modern high-resolution MAS NMR. In this review, following a brief introduction on the basic theory of recoupling in ssNMR, we highlight the recent advances in dipolar and chemical shift anisotropy recoupling methods, as well as their applications in structural determination and dynamical characterization at multiple time scales (i.e., fast-, intermediate-, and slow-motion). The performances of these prevalent recoupling techniques are compared and discussed in multiple aspects, together with the representative applications in biomolecules. Given the recent emerging advances in NMR technology, new challenges for recoupling methodology development and potential opportunities for biological systems are also discussed.
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Affiliation(s)
- Lixin Liang
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Ji
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kuizhi Chen
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Pan Gao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Zhenchao Zhao
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
| | - Guangjin Hou
- State Key Laboratory of Catalysis, National Laboratory for Clean Energy, 2011-Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
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14
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Tang J, Chu Y, Li S, Xu J, Xiong W, Wang Q, Deng F. Breathing Effect via Solvent Inclusions on the Linker Rotational Dynamics of Functionalized MIL-53. Chemistry 2021; 27:14711-14720. [PMID: 34357658 DOI: 10.1002/chem.202102419] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Indexed: 12/24/2022]
Abstract
The breathing effects of functionalized MIL-53-X (X=H, CH3 , NH2 , OH, and NO2 ) induced by the inclusions of water, methanol, acetone, and N,N-dimethylformamide solvents were comprehensively investigated by solid-state NMR spectroscopy. 2D homo-nuclear correlation NMR provided direct experimental evidence for the host-guest interaction between the guest solvents and the MOF frameworks. The variations of the 1 H and 13 C NMR chemical shifts in functionalized MIL-53 from the narrow pore phase transitions to large pore forms due to solvent inclusions were clearly identified. The influence of functionalized linkers and their host-guest interactions with the confined solvents on the rotational dynamics of the linkers was examined by separated-local-field MAS NMR experiments in conjunction with DFT theoretical calculations. It is found that the linker rotational dynamics of functionalized MIL-53 in narrow pore form is closely related to the computational rotational energy barrier. The BDC-NO2 linker of activated MIL-53-NO2 undergoes relatively faster rotation, whereas the BDC-NH2 and BDC-OH linkers of activated MIL-53-NH2 and MIL-53-OH exhibit relatively slower rotation. The host-guest interactions between confined solvents and MIL-53-NO2 , MIL-53-CH3 would significantly induce an increase of the order parameters of unsubstituted carbon and reduce the rotational frequency of linkers. This study provides a spectroscopic approach for the investigation of linker rotation in functionalized MOFs at natural abundance with solvents inclusions.
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Affiliation(s)
- Jing Tang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China.,University of Chinese Academy of Sciences, 100049, Beijing, P. R. China
| | - Yueying Chu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China
| | - Shenhui Li
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China
| | - Jun Xu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China
| | - Wenpeng Xiong
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China.,University of Chinese Academy of Sciences, 100049, Beijing, P. R. China
| | - Qiang Wang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China
| | - Feng Deng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, P. R. China
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15
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Dey KK, Deshmukh MM, Ghosh M. A Description of the Local Structure and Dynamics of Ketoconazole Molecule by Solid‐State NMR Measurements and DFT Calculations: Proposition for NMR Crystallography. ChemistrySelect 2021. [DOI: 10.1002/slct.202102622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Krishna Kishor Dey
- Department of Physics Dr. Harisingh Gour Central University Sagar 470003, Madhya-Pradesh India
| | - Milind M. Deshmukh
- Department of Chemistry Dr. Harisingh Gour Central University Sagar 470003, Madhya-Pradesh India
| | - Manasi Ghosh
- Physics Section MMV Banaras Hindu University Varanasi 221005, Uttar-Pradesh India
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16
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Dey KK, Ghosh M. Study of the structure and dynamics at various parts of the antibacterial drug molecule cefpodoxime proxetil. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2021; 115:101752. [PMID: 34340119 DOI: 10.1016/j.ssnmr.2021.101752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/26/2021] [Accepted: 07/26/2021] [Indexed: 06/13/2023]
Abstract
The structure and dynamics of cefpodoxime proxetil are elucidated by measuring chemical shift anisotropy (CSA) tensor, spin-lattice relaxation time, and local correlation time at twenty-one crystallographically different 13C nuclei sites. The principal components of CSA tensor of cefpodoxime proxetil are extracted by the two-dimensional phase adjusted sinning sideband (2DPASS) cross-polarization magic angle spinning (CP-MAS) solid-state NMR experiment, and the spin-lattice relaxation time is measured by the method outlined by Torchia(T1CP). The local correlation time is calculated by bearing in mind that the spin-lattice relaxation mechanism of 13C nuclei is mainly governed by the CSA interaction and the heteronuclear dipole-dipole interaction. The aminothiazole ring, β-lactam ring, and dihydrothiazine ring provide stability to the drug molecule and increase the affinity of the drug to penicillin-binding proteins (PBPs) receptors. The principal components of CSA parameters, spin-lattice relaxation time, and local correlation time vary substantially for carbon nuclei residing on these three rings. These signify that not only the electronic environment, but the molecular conformation, and the local dynamics are also altered within the ring. The substitution of the acyl side chain, oxime group, and the aminothiazole ring at the C7 position of the β-lactam ring enhances the antibacterial activity and the binding affinity of the drug. A huge variation of the spin-lattice relaxation time and local correlation time is observed in those regions. The change in the electron charge distribution and nuclear spin dynamics at different parts of the drug molecule is clear by CSA and spin-lattice relaxation measurements, which will enrich the field "NMR crystallography".
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics, Dr. Harisingh Gour Central University, Sagar, 470003, Madhya-Pradesh, India
| | - Manasi Ghosh
- Physics Section, MMV, Banaras Hindu University, Varanasi, 221005, Uttar-Pradesh, India.
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17
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Dey K, Lodhi L, Ghosh M. Study of the Variation of the Electronic Distribution and Motional Dynamics of Two Independent Molecules of an Asymmetric Unit of Atorvastatin Calcium by Solid-State NMR Measurements. ACS OMEGA 2021; 6:22752-22764. [PMID: 34514246 PMCID: PMC8427786 DOI: 10.1021/acsomega.1c03095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
Significant changes in the spin-lattice time and chemical shift anisotropy (CSA) parameters are observed in two independent molecules of an asymmetric unit of atorvastatin calcium (ATC-I) (which is referred to as "a"- and "b"-type molecules by following Wang et al.). The longitudinal magnetization decay curve is fitted by two exponentials-one with longer relaxation time and another with shorter relaxation time for most of the carbon nuclei sites. The local correlation time also varies significantly. This is the experimental evidence of the coexistence of two different kinds of motional degrees of freedom within ATC-I molecule. The solubility and bioavailability of the drug molecule are enhanced due to the existence of two different kinds of dynamics. Hence, the macroscopic properties like solubility and bioavailability of a drug molecule are highly correlated with its microscopic properties. The motional degrees of freedom of "a"- and "b"-type molecules are also varied remarkably at certain carbon nuclei sites. This is the first time the change in the molecular dynamics of two independent molecules of an asymmetric unit of atorvastatin calcium is quantified using solid-state NMR methodology. These types of studies, in which the chemical shift anisotropy (CSA) parameters and spin-lattice relaxation time provide information about the change in electronic distribution and the spin dynamics at the various crystallographic location of the drug molecule, will enrich the field "NMR crystallography". It will also help us to understand the electronic distribution around a nucleus and the nuclear spin dynamics at various parts of the molecule, which is essential to develop the strategies for the administration of the drug.
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Affiliation(s)
- Krishna
Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya Pradesh, India
| | - Lekhan Lodhi
- Department
of Zoology, Dr. Harisingh Gour Central University, Sagar 470003, Madhya Pradesh, India
| | - Manasi Ghosh
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar Pradesh, India
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18
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Hempel G, Sotta P, Long DR, Saalwächter K. Efficient polynomial analysis of magic-angle spinning sidebands and application to order parameter determination in anisotropic samples. MAGNETIC RESONANCE (GOTTINGEN, GERMANY) 2021; 2:589-606. [PMID: 37905222 PMCID: PMC10539843 DOI: 10.5194/mr-2-589-2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/15/2021] [Indexed: 11/02/2023]
Abstract
Chemical shift tensors in 13 C solid-state NMR provide valuable localized information on the chemical bonding environment in organic matter, and deviations from isotropic static-limit powder line shapes sensitively encode dynamic-averaging or orientation effects. Studies in 13 C natural abundance require magic-angle spinning (MAS), where the analysis must thus focus on spinning sidebands. We propose an alternative fitting procedure for spinning sidebands based upon a polynomial expansion that is more efficient than the common numerical solution of the powder average. The approach plays out its advantages in the determination of CST (chemical-shift tensor) principal values from spinning-sideband intensities and order parameters in non-isotropic samples, which is here illustrated with the example of stretched glassy polycarbonate.
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Affiliation(s)
- Günter Hempel
- Martin-Luther-Universität Halle-Wittenberg, Institut für Physik – NMR, Betty-Heimann-Str. 7, 06120 Halle, Germany
| | - Paul Sotta
- Ingénierie des Matériaux Polymères, INSA Lyon/CNRS UMR 5223, 17 avenue Jean Capelle, 69621 Villeurbanne CEDEX, France
| | - Didier R. Long
- Université Lyon, INSA Lyon/CNRS, UCBL, MATEIS, UMR5510, 69100 Villeurbanne, France
| | - Kay Saalwächter
- Martin-Luther-Universität Halle-Wittenberg, Institut für Physik – NMR, Betty-Heimann-Str. 7, 06120 Halle, Germany
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19
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Kobayashi T, Perras FA, Nishiyama Y. Determination of the chemical shift tensor anisotropy and asymmetry of strongly dipolar coupled protons under fast MAS. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2021; 114:101743. [PMID: 34153880 DOI: 10.1016/j.ssnmr.2021.101743] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/01/2021] [Accepted: 06/01/2021] [Indexed: 06/13/2023]
Abstract
Orientationally-dependent interactions such as dipolar coupling, quadrupolar coupling, and chemical shift anisotropy (CSA) contain a wealth of spatial information that can be used to elucidate molecular conformations and dynamics. To determine the sign of the chemical shift tensor anisotropy parameter (δaniso), both the |m| = 1 and |m| = 2 components of the CSA need to be symmetry allowed, while the recoupling of the |m| = 1 term is accompanied with the reintroduction of homonuclear dipolar coupling components. Therefore, previously suggested sequences which solely recouple the |m| = 2 term cannot determine the sign a 1H's δaniso in a densely-coupled network. In this study, we demonstrate the CSA recoupling of strongly dipolar coupled 1H spins using the Cnn1(9003601805400360180900) sequence. This pulse scheme recouples both the |m| = 1 and |m| = 2 CSA terms but the scaling factors for the homonuclear dipolar coupling terms are zeroed. Consequently, the sequence is sensitive to the sign of δaniso but is not influenced by homonuclear dipolar interactions.
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Affiliation(s)
- Takeshi Kobayashi
- U.S. DOE, Ames Laboratory, Iowa State University, Ames, IA, 50011-3020, United States.
| | - Frédéric A Perras
- U.S. DOE, Ames Laboratory, Iowa State University, Ames, IA, 50011-3020, United States
| | - Yusuke Nishiyama
- RIKEN-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa, 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo, 196-8558, Japan
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20
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Dey KK, Gayen S, Ghosh M. Structure and dynamics of sodium alginate as elucidated by chemical shift anisotropy and site-specific spin-lattice relaxation time measurements. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2021; 50:963-977. [PMID: 34254174 DOI: 10.1007/s00249-021-01559-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 03/31/2021] [Accepted: 06/26/2021] [Indexed: 11/29/2022]
Abstract
The biocompatible, biodegradable, linear copolymer sodium alginate is fabricated from [Formula: see text] linked [Formula: see text]-D-mannuronic acid (M block) and [Formula: see text]-L-guluronic acid (G-block). It has wide applications in drug delivery, cell encapsulation, and commercial application in the textile, cosmetics, paper, food, biomedical, and pharmaceutical industries. The structure and dynamics of sodium alginate were here investigated by measuring chemical shift anisotropy (CSA) parameters, spin-lattice relaxation time, and molecular correlation time. The principal components of the CSA tensor were determined by two-dimensional phase-adjusted spinning sideband (2DPASS) cross-polarization magic angle spinning (CP-MAS) SSNMR. The alternating M and G blocks of both equatorial and axial links are associated with greater overall flexibility. The molecular correlation time of the carboxyl carbon of both G and M blocks is faster than for the anomeric carbon and pyranose carbon. This is further experimental evidence of the coexistence of two different dynamics within the polysaccharide chains of sodium alginate, which was previously established by 1H-13C dipolar profile analysis. The relaxation time of the para-crystalline region of sodium alginate is comparable with that of chitosan, but it is much shorter than that of cellulose and chitin. The order of the molecular correlation time of sodium alginate and chitosan is also the same. Hence, it can be concluded that sodium alginate exhibits greater flexibility than cellulose and chitin. These types of investigation into the local electronic configuration and nuclear spin dynamics at various carbon nuclei sites of the biopolymer at atomic-scale resolution will help in the design of biomimetic materials.
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics, Dr. Harisingh Gour Central University, Sagar, 470003, India
| | - Shovanlal Gayen
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour Central University, Sagar, 470003, India
| | - Manasi Ghosh
- Physics Section, MMV, Banaras Hindu University, Varanasi, 221005, India.
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21
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Zhu H, O'Dell LA. Nuclear magnetic resonance characterisation of ionic liquids and organic ionic plastic crystals: common approaches and recent advances. Chem Commun (Camb) 2021; 57:5609-5625. [PMID: 34048516 DOI: 10.1039/d1cc02151f] [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
Ionic liquids, and their solid-state equivalents organic ionic plastic crystals, show many useful and tailorable properties that make them interesting for a wide range of applications including as electrolytes for energy storage devices. Nuclear magnetic resonance spectroscopy and related techniques offer a powerful and versatile toolkit for the characterisation of structure, interactions and dynamics in these materials. This article summarises both commonly used methods and some recent advances in this area, including solution- and solid-state methods, dynamic nuclear polarisation, imaging, diffusion and relaxation measurements, and example applications of some less commonly studied nuclei.
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Affiliation(s)
- Haijin Zhu
- Institute for Frontier Materials, Deakin University, Geelong Waurn Ponds Campus, Victoria 3220, Australia.
| | - Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Geelong Waurn Ponds Campus, Victoria 3220, Australia.
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22
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Kafle N, Makita Y, Zheng Y, Schwarz D, Kurosu H, Pan P, Eagan JM, Nakama Y, Hayano S, Miyoshi T. Roles of Conformational Flexibility in the Crystallization of Stereoirregular Polymers. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00888] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Navin Kafle
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Yuta Makita
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Ying Zheng
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
- State Key Laboratory of Chemical Engineering, College of Biological and Chemical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Derek Schwarz
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Hiromichi Kurosu
- Department of Clothing Environmental Science, Nara Women’s University, Kitauoya, Higashimachi, Nara 630-8506, Japan
| | - Pengju Pan
- State Key Laboratory of Chemical Engineering, College of Biological and Chemical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - James M. Eagan
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
| | - Yuki Nakama
- Zeon Corporation R&D Center, 1-2-1 Yako, Kawasaki-ward, Kawasaki City, Kanagawa 210-9507, Japan
| | - Shigetaka Hayano
- Zeon Corporation R&D Center, 1-2-1 Yako, Kawasaki-ward, Kawasaki City, Kanagawa 210-9507, Japan
| | - Toshikazu Miyoshi
- School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
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23
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Fritzsching KJ, Keeler EG, He C, McDermott AE. Scaled recoupling of chemical shift anisotropies at high magnetic fields under MAS with interspersed C-elements. J Chem Phys 2021; 153:104201. [PMID: 32933302 DOI: 10.1063/5.0020682] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The power of chemical shift anisotropy (CSA) measurements for probing structure and dynamics of molecules has been long recognized. NMR pulse sequences that allow measurement of CSA values in an indirect dimension of a protein correlation spectrum have been employed for aliphatic groups, but for practical reasons, carbonyl functional groups have been little studied, despite the fact that carbonyls are expected to give particularly varied and informative CSA values. Specifically, the wide spectral widths of carbonyl tensors make their measurements difficult with typically attainable spectrometer settings. We present here an extended family of experiments that enable the recovery of static CSA lineshapes in an indirect dimension of magic angle spinning (MAS) solid-state NMR experiments, except for various real valued scaling factors. The experiment is suitable for uniformly labeled material, at moderate MAS rates (10 kHz-30 kHz) and at higher magnetic fields (ν0H > 600 MHz). Specifically, the experiments are based on pulse sequence elements from a previous commonly used pulse sequence for CSA measurement, recoupling of chemical shift anisotropy (ROCSA), while modification of scaling factors is achieved by interspersing different blocks of C-elements of the same Cnn 1 cycle. Using experimental conditions similar to the parent ROCSA sequence, a CSA scaling factor between 0 and 0.272 can be obtained, thus allowing a useful practical range of possibilities in experimental conditions for measurement of larger CSA values. Using these blocks, it is also possible to make a constant-time CSA recoupling sequence. The effectiveness of this approach, fROCSA, is shown on model compounds 1-13C-Gly, U-13C,15N-l-His, and microcrystalline U-13C,15N-Ubiquitin.
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Affiliation(s)
| | - Eric G Keeler
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Chengming He
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Ann E McDermott
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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24
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Fu Y, Guan H, Yin J, Kong X. Probing molecular motions in metal-organic frameworks with solid-state NMR. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213563] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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25
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Falkenstein P, Wei R, Matysik J, Song C. Mechanistic investigation of enzymatic degradation of polyethylene terephthalate by nuclear magnetic resonance. Methods Enzymol 2020; 648:231-252. [PMID: 33579405 DOI: 10.1016/bs.mie.2020.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The biocatalytic degradation of polyethylene terephthalate (PET) by thermophilic microbial enzymes has recently emerged as an option for a future eco-friendly recycling process for plastic waste, as it occurs under mild conditions and requires no harmful additives. In this chapter, we present a brief overview of solution and solid-state nuclear magnetic resonance (NMR) spectroscopic methods for the characterization of composition and chemical microstructure of PET and also associated chain dynamics over multiple time scales. Such detailed information provides an understanding of the enzymatic PET degradation mechanism by polyester hydrolases at the molecular level.
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Affiliation(s)
| | - Ren Wei
- Department of Biotechnology & Enzyme Catalysis, Institute of Biochemistry, University of Greifswald, Greifswald, Germany; Junior Research Group Plastic Biodegradation, Institute of Biochemistry, University of Greifswald, Greifswald, Germany
| | - Jörg Matysik
- Institut für Analytische Chemie, Universität Leipzig, Leipzig, Germany
| | - Chen Song
- Institut für Analytische Chemie, Universität Leipzig, Leipzig, Germany.
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26
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Dey K, Ghosh M. Investigation of the Structure and Dynamics of Antiviral Drug Adefovir Dipivoxil by Site-Specific Spin-Lattice Relaxation Time Measurements and Chemical Shift Anisotropy Tensor Measurements. ACS OMEGA 2020; 5:29373-29381. [PMID: 33225168 PMCID: PMC7676337 DOI: 10.1021/acsomega.0c04205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Adefovir is regarded as a potential antiviral agent. However, it cannot be considered as a valuable drug candidate due to its high polarity that limits its permeability across the human intestinal mucosa. When the ribose phosphate group of adefovir is replaced by the isopolar phosphonomethyl ether functionality, it neutralizes the negative charge of the drug. This makes the drug lipid-soluble and potent to diffuse across the cell membrane. The prodrug adefovir dipivoxil is regarded as a potent antiviral drug against hepatitis B virus (HBV), human immunodeficiency virus (HIV), Rauscher murine leukemia virus (R-MuLV), murine cytomegalovirus (MCMV), herpes simplex virus (HSV), simian immunodeficiency virus (SIV), and feline immunodeficiency virus (FIV). The correlation between the structure and the dynamics of adefovir dipivoxil is determined by measuring the principal components of chemical shift anisotropy (CSA) tensor, site-specific spin-lattice relaxation time, and molecular correlation time at crystallographically different carbon nuclei sites. The CSA parameters, spin-lattice relaxation time, and molecular correlation time of phosphorous nucleus of the organophosphate group of adefovir dipivoxil molecule are also determined. The spin-lattice relaxation time of carbon nuclei varies from 1 to 107 s. The range of molecular correlation time also varies from 10-4 to 10-8 s. These remarkable diversities of motional dynamics of the molecules imply that there exist various motional degrees of freedom within this valuable drug and these motional degrees of freedom are independent of each other, which may be the reason for the biological activities exhibited by the drug. The correlation between structure and dynamics of such an important antiviral drug adefovir dipivoxil can be visualized by these types of extensive spectroscopic measurements, which will enlighten the path of inventing advanced medicine in the pharmaceutical industry, and it will also illuminate the understanding of the structure-activity relationships of antiviral drug.
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Affiliation(s)
- Krishna
Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar, 470003 MP, India
| | - Manasi Ghosh
- Physics
Section, MMV, Banaras Hindu University, Varanasi, 221005 UP, India
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27
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Lobo NP, Ramanathan KV, Narasimhaswamy T. 13 C NMR investigations of molecular order of rod-like, bent-core, and thiophene mesogens. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:988-1009. [PMID: 31770458 DOI: 10.1002/mrc.4972] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 11/09/2019] [Accepted: 11/13/2019] [Indexed: 06/10/2023]
Abstract
In this review, methods to obtain the orientational order of topologically variant molecular mesogens using by one- and two-dimensional (2D) solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy are described. Besides 13 C chemical shifts, the 13 C─1 H dipolar couplings measured from 2D-separated local field (SLF) technique are used for computing the order parameters of a variety of mesogens. The investigated molecules are composed of a variable number of rings in the core, that is, core ranging from simply one ring to five rings. Among the mesogens investigated, a special focus has been placed on mesogens with thiophene rings, which are gaining popularity as liquid crystalline organic semiconductors. The replacement of a phenyl ring by thiophene in the core has a dramatic influence on molecular topology, as observed from the measured order parameters. The review highlights the advantages of the 2D SLF method for understanding the local dynamics and for mapping the topology of mesogens through the measured order parameters. SLF NMR studies of as many as 24 molecular mesogens that vary in terms of the molecular structure as well as topology are covered in the review. Order parameters of the rings have been estimated from the 13 C─1 H dipolar couplings in the nematic, smectic A, smectic C, and tilted hexatic phases as well as in B1 and B2 mesophases of various mesogens. It is anticipated that, in the years to come, the 2D SLF method would provide advanced molecular information on structurally complex mesogens that are emerging in liquid crystal science through the incessant efforts of synthetic chemists. The mini review covers the orientational order of topologically variant molecular mesogens determined by 1D and 2D solid-state 13 C NMR spectroscopy. Accordingly, rod-like, bent-core, and thiophene mesogens were subjected to 2D SLF measurements to get the order parameters from which the topology was established. The replacement of phenyl ring by thiophene and its influence on order parameters as well as on molecular topology is also discussed.
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Affiliation(s)
- Nitin P Lobo
- Inorganic and Physical Chemistry, CSIR-Central Leather Research Institute, Chennai, India
| | - K V Ramanathan
- NMR Research Centre, Indian Institute of Science, Bangalore, India
| | - T Narasimhaswamy
- Polymer Science and Technology, CSIR-Central Leather Research Institute, Chennai, India
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28
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Yuan S, Schmidt-Rohr K. Immobilized 13C-labeled polyether chain ends confined to the crystallite surface detected by advanced NMR. SCIENCE ADVANCES 2020; 6:eabc0059. [PMID: 32917712 PMCID: PMC7486094 DOI: 10.1126/sciadv.abc0059] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
A comprehensive 13C nuclear magnetic resonance (NMR) approach for characterizing the location of chain ends of polyethers and polyesters, at the crystallite surface or in the amorphous layers, is presented. The OH chain ends of polyoxymethylene are labeled with 13COO-acetyl groups and their dynamics probed by 13C NMR with chemical shift anisotropy (CSA) recoupling. At least three-quarters of the chain ends are not mobile dangling cilia but are immobilized, exhibiting a powder pattern characteristic of the crystalline environment and fast CSA dephasing. The location and clustering of the immobilized chain ends are analyzed by spin diffusion. Fast 1H spin diffusion from the amorphous regions shows confinement of chain ends to the crystallite surface, corroborated by fast 13C spin exchange between chain ends. These observations confirm the principle of avoidance of density anomalies, which requires that chains terminate at the crystallite surface to stay out of the crowded interfacial layer.
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Affiliation(s)
- Shichen Yuan
- Department of Chemistry, Brandeis University, Waltham, MA 02453, USA
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29
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Chapovetsky A, Langeslay RR, Celik G, Perras FA, Pruski M, Ferrandon MS, Wegener EC, Kim H, Dogan F, Wen J, Khetrapal N, Sharma P, White J, Kropf AJ, Sattelberger AP, Kaphan DM, Delferro M. Activation of Low-Valent, Multiply M–M Bonded Group VI Dimers toward Catalytic Olefin Metathesis via Surface Organometallic Chemistry. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00787] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alon Chapovetsky
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Ryan R. Langeslay
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Gokhan Celik
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | | | - Marek Pruski
- U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Magali S. Ferrandon
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Evan C. Wegener
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Hacksung Kim
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Center for Catalysis and Surface Science and Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Fulya Dogan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Jianguo Wen
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Navneet Khetrapal
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Prachi Sharma
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Jacob White
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - A. Jeremy Kropf
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Alfred P. Sattelberger
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - David M. Kaphan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Massimiliano Delferro
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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30
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Wang Z, Patnaik S, Eedugurala N, Manzano JS, Slowing II, Kobayashi T, Sadow AD, Pruski M. Silica-Supported Organolanthanum Catalysts for C–O Bond Cleavage in Epoxides. J Am Chem Soc 2020; 142:2935-2947. [DOI: 10.1021/jacs.9b11606] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Zhuoran Wang
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Smita Patnaik
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Naresh Eedugurala
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - J. Sebastián Manzano
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Igor I. Slowing
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Takeshi Kobayashi
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Marek Pruski
- Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
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31
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Dey KK, Ghosh M. Determination of the correlation between the structure and dynamics of deflazacort by solid state NMR measurements. NEW J CHEM 2020. [DOI: 10.1039/d0nj03418e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The correlation between the structure and dynamics of glucocorticoid deflazacort is determined by a 2DPASS CP-MAS SSNMR experiment and 13C spin–lattice relaxation time by a Torchia CP experiment.
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics
- Dr Harisingh Gour Central University
- Sagar-470003
- India
| | - Manasi Ghosh
- Physics Section
- MMV
- Banaras Hindu University
- Varanasi-221005
- India
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32
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Dey KK, Ghosh M. Understanding the effect of deacetylation on chitin by measuring chemical shift anisotropy tensor and spin lattice relaxation time. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136782] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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33
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Ghosh M, Gayen S, Dey KK. An atomic resolution description of folic acid using solid state NMR measurements. RSC Adv 2020; 10:24973-24984. [PMID: 35517491 PMCID: PMC9055165 DOI: 10.1039/d0ra03772a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 06/15/2020] [Indexed: 11/21/2022] Open
Abstract
The chemical shift anisotropy tensor and site-specific spin-lattice relaxation time of folic acid were determined by a 13C 2DPASS CP-MAS NMR experiment and Torchia CP experiment respectively. The molecular correlation time at various carbon nuclei sites of folic acid was evaluated by assuming that the 13C spin-lattice relaxation mechanism is mainly governed by chemical shift anisotropy interaction and hetero-nuclear dipole–dipole coupling. CSA parameters are larger for the carbon nuclei residing at the heteroaromatic ring and aromatic ring, and those attached to double-bonded electronegative oxygen atoms. It is comparatively low for C9, C19, C21, and C22. The molecular correlation time is of the order of 10−4/10−5 s for C9, C19, C21 and C22 carbon nuclei, whereas it is of the order of 10−3 s for the rest of the carbon nuclei sites. Spin lattice relaxation time varies from 416 s to 816 s. For C23 and C14, the value is 816 s, and it is 416 s for C7 nuclei. The correlation between structure and dynamics on an atomic scale of such an important drug as folic acid can be visualized by these types of extensive spectroscopic measurements, which will help to develop an advanced drug for DNA replication. The chemical shift anisotropy tensor and site specific spin-lattice relaxation time of folic acid were determined by a 13C 2DPASS CP-MAS NMR experiment and Torchia CP experiment respectively.![]()
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Affiliation(s)
- Manasi Ghosh
- Department of Physics
- Dr Harisingh Gour Central University
- Sagar-470003
- India
| | - Shovanlal Gayen
- Department of Pharmaceutical Sciences
- Dr Harisingh Gour Central University
- Sagar-470003
- India
| | - Krishna Kishor Dey
- Department of Physics
- Dr Harisingh Gour Central University
- Sagar-470003
- India
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34
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Dey KK, Ghosh M. Understanding the structure and dynamics of anti-inflammatory corticosteroid dexamethasone by solid state NMR spectroscopy. RSC Adv 2020; 10:37564-37575. [PMID: 35521289 PMCID: PMC9057149 DOI: 10.1039/d0ra05474g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 10/01/2020] [Indexed: 12/31/2022] Open
Abstract
For decades corticosteroid dexamethasone has been applied as an anti-inflammatory, immunosuppressant, and decongestant, in the prevention of postoperative nausea and vomiting (PONV), and for auto-immune diseases, allergic reactions, total hip arthroplasty (THA), and cancer. Recently in vitro studies suggested that it may be beneficial to deal with the COVID-19 pandemic. This important drug molecule was investigated by solid state NMR measurements to provide more complete features of its structure and dynamics at atomic scale resolution. The spin–lattice relaxation time at twenty-two different carbon sites of dexamethasone was determined by the Torchia CP method. The principle components of the chemical shift anisotropy tensor were determined by 13C two-dimensional phase adjusted spinning sideband (2DPASS) cross-polarization magic angle spinning (CP-MAS) solid state NMR experiments. The molecular correlation time at twenty-two crystallographically different carbon sites of dexamethasone was calculated by considering that the spin–lattice relaxation mechanism of the 13C nucleus is mainly governed by the chemical shift anisotropy interaction and the heteronuclear dipole–dipole coupling. The spin–lattice relaxation time of carbon nuclei resides on ‘A’, ‘B’, ‘C’, and ‘D’ rings and the side-chain of dexamethasone is quite large, which implies the close-packed arrangement of the molecule. The difference in molecular correlation time at various regions of the molecule demonstrates the existence of different degrees of freedom within the molecule. This may be the reason for the various biological activities exhibited by the molecule. These types of detailed features of the structure and dynamics of such an important drug with multiple biological activities are necessary to develop the advanced medicine and it will also help to understand the structure–activity relationships of corticosteroid. The structure and dynamics of dexamethasone is determined by measuring CSA tensor, site-specific spin–lattice relaxation time.![]()
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics
- Dr. Harisingh Gour Central University
- Sagar-470003
- India
| | - Manasi Ghosh
- Physics Section
- MMV
- Banaras Hindu University
- Varanasi-221005
- India
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Dey KK, Gayen S, Ghosh M. Understanding the correlation between structure and dynamics of clocortolone pivalate by solid state NMR measurement. RSC Adv 2020; 10:4310-4321. [PMID: 35495240 PMCID: PMC9049206 DOI: 10.1039/c9ra09866f] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 01/09/2020] [Indexed: 11/21/2022] Open
Abstract
Structural characteristics of clocortolone pivalate are unique in the topical corticosteroid field having high penetration power through the stratum corneum of skin as well as low corticosteroid-related adverse effects.
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Affiliation(s)
| | - Shovanlal Gayen
- Department of Pharmaceutical Sciences
- Dr Harisingh Gour Central University
- Sagar
- India
| | - Manasi Ghosh
- Department of Physics
- Dr Harisingh Gour Central University
- Sagar
- India
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36
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Dey KK, Ghosh M. Determination of chemical shift anisotropy tensor and molecular correlation time of proton pump inhibitor omeprazole by solid state NMR measurements. NEW J CHEM 2020. [DOI: 10.1039/d0nj01827a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The correlation between the structure and dynamics of omeprazole is portrayed by extracting CSA parameters through the 13C 2DPASS CP-MAS SSNMR experiment, site specific spin–lattice relaxation time by Torchia CP experiment, and calculation of the molecular correlation time.
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics
- Dr. Harisingh Gour Central University
- Sagar-470003
- India
| | - Manasi Ghosh
- Department of Physics (MMV Section)
- Banaras Hindu University
- Varanasi-221005
- India
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37
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Dey K, Gayen S, Ghosh M. Investigation of the Detailed Internal Structure and Dynamics of Itraconazole by Solid-State NMR Measurements. ACS OMEGA 2019; 4:21627-21635. [PMID: 31867560 PMCID: PMC6921643 DOI: 10.1021/acsomega.9b03558] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 11/19/2019] [Indexed: 06/10/2023]
Abstract
The structure and dynamics of itraconazole were investigated by 13C 2DPASS MAS SSNMR and spin-lattice relaxation time measurement to get an insight into its multiple biological activities, e.g., antifungal, antiviral, anticancer activities, etc. The molecular correlation time at chemically different sites of carbon nuclei was calculated by considering that the spin-lattice relaxation mechanism is mainly dominated by chemical shift anisotropy interaction and heteronuclear dipole-dipole interaction. The spin-lattice relaxation time is long for C35, C6, C5, and C34 carbon nuclei that participated in the 1, 2, 4-triazole ring. On the contrary, it is comparatively shorter for C1, C2, C3, and C4 carbon nuclei associated with the sec-butyl group in the triazolane side-chain region. Chemical shift anisotropy (CSA) parameters of C5, C6, C34, and C35 nuclei are much higher than those of C1, C2, C3, C4 nuclei, indicating that the relaxation mechanism at a high value of magnetic field is predominated by chemical shift anisotropy interaction. The molecular correlation time of carbon nuclei residing at the side-chain region is 2-3 orders of magnitude lesser than that of those participated in the 1,2,4-triazole ring. The spin-lattice relaxation time is very long for carbon nuclei C28 and C30 bonded with chlorine. Asymmetry and anisotropy parameters are also very high for the spinning CSA sideband pattern corresponding to the C28 and C30 nuclei. The molecular correlation time is on the order of 10-3 s for C28 and 10-4 s for C30, whereas for side-chain carbon nuclei, it is on the order of 10-6 s. This suggests that the effective magnetic field experienced by C28 and C30 nuclei is affected by the polarization of the chemical bond. A huge variation in molecular correlation time is observed for chemically different sites of carbon nuclei of the itraconazole molecule. These investigations vividly portrayed how the structure is correlated with the dynamics of a valuable drug, itraconazole, with multiple biological activities. This study will enlighten the way of inventing advance medicine for multiple biological activities in the pharmaceutical industry.
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Affiliation(s)
- Krishna
Kishor Dey
- Department
of Physics and Department of Pharmaceutical Sciences, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh 470003, India
| | - Shovanlal Gayen
- Department
of Physics and Department of Pharmaceutical Sciences, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh 470003, India
| | - Manasi Ghosh
- Department
of Physics and Department of Pharmaceutical Sciences, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh 470003, India
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38
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Ghosh M, Kango N, Dey KK. Investigation of the internal structure and dynamics of cellulose by 13C-NMR relaxometry and 2DPASS-MAS-NMR measurements. JOURNAL OF BIOMOLECULAR NMR 2019; 73:601-616. [PMID: 31414362 DOI: 10.1007/s10858-019-00272-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 07/15/2019] [Indexed: 06/10/2023]
Abstract
Internal structure and dynamics of commercial and natural cellulose were studied by measuring chemical shift anisotropy (CSA) parameters, and spin-lattice relaxation rate (1/T1) at each and every chemically different carbon nuclear site. CSA parameters were measured by 13C two-dimensional phase adjusted spinning sideband (2DPASS) cross-polarization magic angle spinning (CP-MAS) NMR experiment. Site specific spin-lattice relaxation time was measured by Torchia-CP method. Anisotropy parameters of C4 and C6 regions are higher than C1 and C235 regions and asymmetry of C4 line is lower than any other carbon site. The higher values of CSA parameters of C4 and C6 nuclei arise due to the rotation of O4-C4, C1-O4, O5-C5-C6-O6 and C4-C5-C6-O6 bonds at torsion angles ψ, Φ, χ and χ' respectively and the influence of interchain and intrachain hydrogen bondings. Two distinct peaks are also observed for C4 and C6 resonance line position-one peak arises primarily due to the nuclei in amorphous region and another one arises due to the same nuclei resides in paracrystalline region. The spin-lattice relaxation time and the CSA parameters are different at these two distinct peak positions of C4 and C6 line. Molecular correlation time of each and every chemically different carbon site was calculated with the help of CSA parameters and spin-lattice relaxation time. The molecular correlation time of the amorphous region is one order of magnitude less than the crystalline region. The distinction between amorphous and paracrystalline regions of cellulose is more vividly portrayed by determining spin-lattice relaxation time, CSA parameters, and molecular correlation time at each and every chemically different carbon site. This type of study correlating the structure and dynamics of cellulose will illuminate the path of inventing biomimetic materials.
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Affiliation(s)
- Manasi Ghosh
- Department of Physics, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India
| | - Naveen Kango
- Department of Microbiology, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India
| | - Krishna Kishor Dey
- Department of Physics, Dr. Harisingh Gour Central University, Sagar, MP, 470003, India.
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39
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Ghosh M, Prajapati BP, Kango N, Dey KK. A comprehensive and comparative study of the internal structure and dynamics of natural β-keratin and regeneratedβ-keratin by solid state NMR spectroscopy. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2019; 101:1-11. [PMID: 31055225 DOI: 10.1016/j.ssnmr.2019.04.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 04/21/2019] [Accepted: 04/23/2019] [Indexed: 06/09/2023]
Abstract
Structure and dynamics of natural and regenerated chicken feather β-keratin were investigated by 13C cross-polarization (CP) magic angle spinning (MAS) solid state nuclear magnetic resonance (SSNMR) spectral analysis, 13C and 1H spin-lattice relaxation time measurements, and 13C two dimensional phase adjusted spinning sidebands (2DPASS) MAS SSNMR measurements. Chemical shift anisotropy (CSA) parameters of both natural and regenerated chicken feather β-keratin were extracted by using 2DPASS MAS SSNMR experiment. The beauty of 2DPASS MAS SSNMR experiment is it can correlate the isotropic and anisotropic dimension with the help of shearing transformation and two dimensional Fourier Transformation. Molecular correlation time at each and every magnetically inequivalent carbon site of both natural and regenerated chicken feather β-keratin were also determined. The change in molecular dynamics of structural protein after pretreatment was monitored by 2DPASS MAS SSNMR and 13C relaxation measurement. This type of comprehensive study will provide the information about the interrelation between the structure and dynamics of structural protein and will also shed light in the way of developing methods for conversion of animal by-products to novel product.
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Affiliation(s)
- Manasi Ghosh
- Department of Physics, Sagar, MP, 470003, India.
| | - Bhanu Pratap Prajapati
- Department of Microbiology, Dr. Hari Singh Gour Central University, Sagar, MP, 470003, India
| | - Naveen Kango
- Department of Microbiology, Dr. Hari Singh Gour Central University, Sagar, MP, 470003, India
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40
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Studying hydrogen bonding and dynamics of the acetylate groups of the Special Pair of Rhodobacter sphaeroides WT. Sci Rep 2019; 9:10528. [PMID: 31324886 PMCID: PMC6642110 DOI: 10.1038/s41598-019-46903-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 07/08/2019] [Indexed: 11/17/2022] Open
Abstract
Although the cofactors in the bacterial reaction centre of Rhodobacter sphaeroides wild type (WT) are arranged almost symmetrically in two branches, the light-induced electron transfer occurs selectively in one branch. As origin of this functional symmetry break, a hydrogen bond between the acetyl group of PL in the primary donor and His-L168 has been discussed. In this study, we investigate the existence and rigidity of this hydrogen bond with solid-state photo-CIDNP MAS NMR methods offering information on the local electronic structure due to highly sensitive and selective NMR experiments. On the time scale of the experiment, the hydrogen bond between PL and His-L168 appears to be stable and not to be affected by illumination confirming a structural asymmetry within the Special Pair.
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41
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Fu Y, Kang Z, Yin J, Cao W, Tu Y, Wang Q, Kong X. Duet of Acetate and Water at the Defects of Metal-Organic Frameworks. NANO LETTERS 2019; 19:1618-1624. [PMID: 30716273 DOI: 10.1021/acs.nanolett.8b04518] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Metal-organic frameworks (MOFs) are porous crystalline materials with promising applications in molecular adsorption, separation, and catalysis. It has been discovered recently that structural defects introduced unintentionally or by design could have a significant impact on their properties. However, the exact chemical composition and structural evolution under different conditions at the defects are still under debate. In this study, we performed multidimensional solid-state nuclear magnetic resonance (SSNMR) coupled with computer simulations to elucidate an important scenario of MOF defects, uncovering the dynamic interplay between residual acetate and water. Acetate, as a defect modulator, and water, as a byproduct, are prevalent defect-associated species, which are among the key factors determining the reactivity and stability of defects. We discovered that acetate molecules coordinate to a single metal site monodentately and pair with water at the neighboring position. The acetates are highly flexible, which undergo fast libration as well as a slow kinetic exchange with water through dynamic hydrogen bonds. The dynamic processes under variable temperatures and different hydration levels have been quantitatively analyzed across a broad time scale from microseconds to seconds. The integration of SSNMR and computer simulations allows a precision probe into defective MOF structures with intrinsic dynamics and disorder.
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Affiliation(s)
- Yao Fu
- Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China
- Department of Chemical and Biomolecular Engineering , University of California , Berkeley , California 94720 , United States
| | - Zhengzhong Kang
- Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China
- Department of Theoretical Chemistry and Biology , KTH Royal Institute of Technology , Stockholm SE-10691 , Sweden
| | - Jinglin Yin
- Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China
| | - Weicheng Cao
- Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China
| | - Yaoquan Tu
- Department of Theoretical Chemistry and Biology , KTH Royal Institute of Technology , Stockholm SE-10691 , Sweden
| | - Qi Wang
- Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China
| | - Xueqian Kong
- Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China
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42
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Liang L, Hou G, Bao X. Measurement of proton chemical shift anisotropy in solid-state NMR spectroscopy. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2018; 93:16-28. [PMID: 29803915 DOI: 10.1016/j.ssnmr.2018.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 04/12/2018] [Accepted: 04/12/2018] [Indexed: 06/08/2023]
Abstract
Proton chemical shift anisotropy (CSA) is significantly important as it provides the information of the dynamics and local environmental structure of the proton. The measurement of proton CSA keeps drawing the attention of NMR researchers, and great efforts have been expended. In the early years, measuring proton CSA in solid-state NMR, especially with the strong 1H-1H dipolar network, was hampered by ineffective decoupling or selectively recoupling techniques, and the applications were only limited to those with sparse proton sites or single crystals. Till the latest decades, the dramatic progress on NMR methodology and magic-angle spinning (MAS) technology enable accurate detection of proton CSA in complicated powder samples even proteins. In this review, following a brief description of the measurement of proton CSA in solution and LCs NMR, a retrospect of the experimental development of proton CSA measurement in solid state NMR is presented, from the continuous wave (CW) and multiple pulse sequences for static solid samples, to combined rotation and multiple pulse spectroscopy (CRAMPS), then to the latest methods including rotary resonance, CSA amplification and R-symmetry pulse sequences under MAS conditions.
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Affiliation(s)
- Lixin Liang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangjin Hou
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
| | - Xinhe Bao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China
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43
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Soss SE, Flynn PF, Iuliucci RJ, Young RP, Mueller LJ, Hartman J, Beran GJO, Harper JK. Measuring and Modeling Highly Accurate
15
N Chemical Shift Tensors in a Peptide. Chemphyschem 2017; 18:2225-2232. [DOI: 10.1002/cphc.201700357] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 06/08/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Sarah E. Soss
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
| | - Peter F. Flynn
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
| | - Robbie J. Iuliucci
- Department of Chemistry Washington and Jefferson College 60 Lincoln Street Washington PA 15301 USA
| | - Robert P. Young
- Department of Chemistry University of California Riverside CA 92521 USA
| | | | - Joshua Hartman
- Department of Chemistry University of California Riverside CA 92521 USA
| | | | - James K. Harper
- Department of Chemistry University of Central Florida 4111 Libra Drive Orlando FL 32816 USA
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44
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Mao J, Cao X, Olk DC, Chu W, Schmidt-Rohr K. Advanced solid-state NMR spectroscopy of natural organic matter. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2017; 100:17-51. [PMID: 28552171 DOI: 10.1016/j.pnmrs.2016.11.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 11/15/2016] [Accepted: 11/28/2016] [Indexed: 06/07/2023]
Abstract
Solid-state NMR is essential for the characterization of natural organic matter (NOM) and is gaining importance in geosciences and environmental sciences. This review is intended to highlight advanced solid-state NMR techniques, especially a systematic approach to NOM characterization, and their applications to the study of NOM. We discuss some basics of how to acquire high-quality and quantitative solid-state 13C NMR spectra, and address some common technical mistakes that lead to unreliable spectra of NOM. The identification of specific functional groups in NOM, primarily based on 13C spectral-editing techniques, is described and the theoretical background of some recently-developed spectral-editing techniques is provided. Applications of solid-state NMR to investigating nitrogen (N) in NOM are described, focusing on limitations of the widely used 15N CP/MAS experiment and the potential of improved advanced NMR techniques for characterizing N forms in NOM. Then techniques used for identifying proximities, heterogeneities and domains are reviewed, and some examples provided. In addition, NMR techniques for studying segmental dynamics in NOM are reviewed. We also briefly discuss applications of solid-state NMR to NOM from various sources, including soil organic matter, aquatic organic matter, organic matter in atmospheric particulate matter, carbonaceous meteoritic organic matter, and fossil fuels. Finally, examples of NMR-based structural models and an outlook are provided.
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Affiliation(s)
- Jingdong Mao
- Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Blvd., Norfolk, VA 23529, United States.
| | - Xiaoyan Cao
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA 02453, United States.
| | - Dan C Olk
- National Laboratory for Agriculture and the Environment, 1015 N. University Blvd., Ames, IA 50011, United States.
| | - Wenying Chu
- Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Blvd., Norfolk, VA 23529, United States.
| | - Klaus Schmidt-Rohr
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA 02453, United States.
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45
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Lummiss JAM, Perras FA, McDonald R, Bryce DL, Fogg DE. Sterically Driven Olefin Metathesis: The Impact of Alkylidene Substitution on Catalyst Activity. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00984] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Justin A. M. Lummiss
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| | - Frédéric A. Perras
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| | - Robert McDonald
- X-ray
Crystallographic Laboratory, Department of Chemistry, University of Alberta, Edmonton, AB, Canada, T6G 2G2
| | - David L. Bryce
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
| | - Deryn E. Fogg
- Centre for Catalysis Research & Innovation and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, Canada, K1N 6N5
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46
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Baek SB, Moon D, Graf R, Cho WJ, Park SW, Yoon TU, Cho SJ, Hwang IC, Bae YS, Spiess HW, Lee HC, Kim KS. High-temperature in situ crystallographic observation of reversible gas sorption in impermeable organic cages. Proc Natl Acad Sci U S A 2015; 112:14156-61. [PMID: 26578758 PMCID: PMC4655546 DOI: 10.1073/pnas.1504586112] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Crystallographic observation of adsorbed gas molecules is a highly difficult task due to their rapid motion. Here, we report the in situ single-crystal and synchrotron powder X-ray observations of reversible CO2 sorption processes in an apparently nonporous organic crystal under varying pressures at high temperatures. The host material is formed by hydrogen bond network between 1,3,5-tris-(4-carboxyphenyl)benzene (H3BTB) and N,N-dimethylformamide (DMF) and by π-π stacking between the H3BTB moieties. The material can be viewed as a well-ordered array of cages, which are tight packed with each other so that the cages are inaccessible from outside. Thus, the host is practically nonporous. Despite the absence of permanent pathways connecting the empty cages, they are permeable to CO2 at high temperatures due to thermally activated molecular gating, and the weakly confined CO2 molecules in the cages allow direct detection by in situ single-crystal X-ray diffraction at 323 K. Variable-temperature in situ synchrotron powder X-ray diffraction studies also show that the CO2 sorption is reversible and driven by temperature increase. Solid-state magic angle spinning NMR defines the interactions of CO2 with the organic framework and dynamic motion of CO2 in cages. The reversible sorption is attributed to the dynamic motion of the DMF molecules combined with the axial motions/angular fluctuations of CO2 (a series of transient opening/closing of compartments enabling CO2 molecule passage), as revealed from NMR and simulations. This temperature-driven transient molecular gating can store gaseous molecules in ordered arrays toward unique collective properties and release them for ready use.
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Affiliation(s)
- Seung Bin Baek
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea
| | - Dohyun Moon
- Pohang Accelerator Laboratory, Pohang 790-834, Korea
| | - Robert Graf
- Max-Planck-Institute for Polymer Research, 55128, Mainz, Germany
| | - Woo Jong Cho
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea
| | - Sung Woo Park
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Tae-Ung Yoon
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea
| | - Seung Joo Cho
- Department of Cellular Molecular Medicine, College of Medicine, Chosun University, Gwangju 501-759, Korea
| | - In-Chul Hwang
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Youn-Sang Bae
- Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea
| | - Hans W Spiess
- Max-Planck-Institute for Polymer Research, 55128, Mainz, Germany
| | - Hee Cheon Lee
- Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Kwang S Kim
- Department of Chemistry and Center for Superfunctional Materials, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea;
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47
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Martin RW, Kelly JE, Collier KA. Spatial reorientation experiments for NMR of solids and partially oriented liquids. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2015; 90-91:92-122. [PMID: 26592947 PMCID: PMC6936739 DOI: 10.1016/j.pnmrs.2015.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 10/13/2015] [Accepted: 10/15/2015] [Indexed: 06/05/2023]
Abstract
Motional reorientation experiments are extensions of Magic Angle Spinning (MAS) where the rotor axis is changed in order to average out, reintroduce, or scale anisotropic interactions (e.g. dipolar couplings, quadrupolar interactions or chemical shift anisotropies). This review focuses on Variable Angle Spinning (VAS), Switched Angle Spinning (SAS), and Dynamic Angle Spinning (DAS), all of which involve spinning at two or more different angles sequentially, either in successive experiments or during a multidimensional experiment. In all of these experiments, anisotropic terms in the Hamiltonian are scaled by changing the orientation of the spinning sample relative to the static magnetic field. These experiments vary in experimental complexity and instrumentation requirements. In VAS, many one-dimensional spectra are collected as a function of spinning angle. In SAS, dipolar couplings and/or chemical shift anisotropies are reintroduced by switching the sample between two different angles, often 0° or 90° and the magic angle, yielding a two-dimensional isotropic-anisotropic correlation spectrum. Dynamic Angle Spinning (DAS) is a related experiment that is used to simultaneously average out the first- and second-order quadrupolar interactions, which cannot be accomplished by spinning at any unique rotor angle in physical space. Although motional reorientation experiments generally require specialized instrumentation and data analysis schemes, some are accessible with only minor modification of standard MAS probes. In this review, the mechanics of each type of experiment are described, with representative examples. Current and historical probe and coil designs are discussed from the standpoint of how each one accomplishes the particular objectives of the experiment(s) it was designed to perform. Finally, applications to inorganic materials and liquid crystals, which present very different experimental challenges, are discussed. The review concludes with perspectives on how motional reorientation experiments can be applied to current problems in chemistry, molecular biology, and materials science, given the many advances in high-field NMR magnets, fast spinning, and sample preparation realized in recent years.
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Affiliation(s)
- Rachel W Martin
- Department of Chemistry, University of California, Irvine 92697-2025, United States; Department of Molecular Biology and Biochemistry, University of California, Irvine 92697-3900, United States.
| | - John E Kelly
- Department of Chemistry, University of California, Irvine 92697-2025, United States
| | - Kelsey A Collier
- Department of Physics and Astronomy, University of California, Irvine 92697-4575, United States
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48
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Pandey MK, Nishiyama Y. Determination of relative orientation between (1)H CSA tensors from a 3D solid-state NMR experiment mediated through (1)H/(1)H RFDR mixing under ultrafast MAS. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 70:15-20. [PMID: 26065628 DOI: 10.1016/j.ssnmr.2015.05.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 04/14/2015] [Accepted: 05/07/2015] [Indexed: 06/04/2023]
Abstract
To obtain piercing insights into inter and intramolecular H-bonding, and π-electron interactions measurement of (1)H chemical shift anisotropy (CSA) tensors is gradually becoming an obvious choice. While the magnitude of CSA tensors provides unique information about the local electronic environment surrounding the nucleus, the relative orientation between these tensors can offer further insights into the spatial arrangement of interacting nuclei in their respective three-dimensional (3D) space. In this regard, we present a 3D anisotropic/anisotropic/isotropic proton chemical shift (CSA/CSA/CS) correlation experiment mediated through (1)H/(1)H radio frequency-driven recoupling (RFDR) which enhances spin diffusion through recoupled (1)H-(1)H dipolar couplings under ultrafast magic angle spinning (MAS) frequency (70kHz). Relative orientation between two interacting 1H CSA tensors is obtained by fitting two-interacting (1)H CSA tensors by fitting two-dimensional (2D) (1)H/(1)H CSA/CSA spectral slices through extensive numerical simulations. To recouple (1)H CSAs in the indirect frequency dimensions of a 3D experiment we have employed γ-encoded radio frequency (RF) pulse sequence based on R-symmetry (R188(7)) with a series of phase-alternated 2700(°)-90180(°) composite-180° pulses on citric acid sample. Due to robustness of applied (1)H CSA recoupling sequence towards the presence of RF field inhomogeneity, we have successfully achieved an excellent (1)H/(1)H CSA/CSA cross-correlation efficiency between H-bonded sites of citric acid.
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Affiliation(s)
- Manoj Kumar Pandey
- RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan
| | - Yusuke Nishiyama
- RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan; JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan.
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49
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Song G, Kusumi R, Kimura F, Kimura T, Deguchi K, Ohki S, Fujito T, Simizu T. Single-crystal NMR approach for determining chemical shift tensors from powder samples via magnetically oriented microcrystal arrays. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 255:28-33. [PMID: 25898399 DOI: 10.1016/j.jmr.2015.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 03/10/2015] [Accepted: 03/15/2015] [Indexed: 06/04/2023]
Abstract
The single-crystal rotation technique was applied to magnetically oriented microcrystal arrays (MOMAs) of cellobiose (monoclinic) to determine the principal values and principal axes of the chemical shift tensors of C1 and C1' carbons. Rotations were performed about the magnetic χ1, χ2, and χ3 axes of MOMA, and the measurements were taken at six different orientations with respect to the applied magnetic field. Under these rotations, crowded peaks were reduced and the peaks for the C1 and C1' carbons were identified by comparing with simulation results. Six components of the chemical shift tensor expressed with respect to the magnetic χ1χ2χ3-frame were determined. The tensors thus obtained were transformed into those relative to the molecular frame.
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Affiliation(s)
- Guangjie Song
- Division of Forest and Biomaterials Science, Kyoto University, Kyoto 606-8502, Japan
| | - Ryosuke Kusumi
- Division of Forest and Biomaterials Science, Kyoto University, Kyoto 606-8502, Japan
| | - Fumiko Kimura
- Division of Forest and Biomaterials Science, Kyoto University, Kyoto 606-8502, Japan
| | - Tsunehisa Kimura
- Division of Forest and Biomaterials Science, Kyoto University, Kyoto 606-8502, Japan.
| | - Kenzo Deguchi
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Shinobu Ohki
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Teruaki Fujito
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Tadashi Simizu
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
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50
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Shao XD, Zhang X, Shi C, Yao YF, Zhang W. Switching Dielectric Constant Near Room Temperature in a Molecular Crystal. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2015; 2:1500029. [PMID: 27980939 PMCID: PMC5115362 DOI: 10.1002/advs.201500029] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 02/25/2015] [Indexed: 05/04/2023]
Abstract
The organic salt bis(2-chloroethyl)amine hydrochloride shows a sharp switching of its dielectric constant at 320 K. The switching property originates from the dynamic changes of the (2-chloroethyl)ammonium cation between frozen and motional states, corresponding to a structural phase transition.
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Affiliation(s)
- Xiu-Dan Shao
- Ordered Matter Science Research Center Southeast University Nanjing 211189 Jiangsu China
| | - Xi Zhang
- Department of Physics and Shanghai Key Laboratory of Magnetic Resonance East China Normal University North Zhongshan Road 3663 Shanghai 200062 China
| | - Chao Shi
- Ordered Matter Science Research Center Southeast University Nanjing 211189 Jiangsu China
| | - Ye-Feng Yao
- Department of Physics and Shanghai Key Laboratory of Magnetic Resonance East China Normal University North Zhongshan Road 3663 Shanghai 200062 China
| | - Wen Zhang
- Ordered Matter Science Research Center Southeast University Nanjing 211189 Jiangsu China
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