1
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Mohammad I, Cambaz MA, Samoson A, Fichtner M, Witter R. Development of in situ high resolution NMR: Proof-of-principle for a new (spinning) cylindrical mini-pellet approach applied to a Lithium ion battery. Solid State Nucl Magn Reson 2024; 129:101914. [PMID: 38154437 DOI: 10.1016/j.ssnmr.2023.101914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 12/14/2023] [Accepted: 12/14/2023] [Indexed: 12/30/2023]
Abstract
Solid-state nuclear magnetic resonance (ssNMR) spectroscopy is a powerful technique for characterizing the local structure and dynamics of battery and other materials. It has been widely used to investigate bulk electrode compounds, electrolytes, and interfaces. Beside common ex situ investigations, in situ and operando techniques have gained considerable importance for understanding the reaction mechanisms and cell degradation of electrochemical cells. Herein, we present the recent development of in situ magic angle spinning (MAS) NMR methodologies to study batteries with high spectral resolution, setting into context possible advances on this topic. A mini cylindrical cell type insert for 4 mm MAS rotors is introduced here, being demonstrated on a Li/VO2F electrochemical system, allowing the acquisition of high-resolution 7Li MAS NMR spectra, spinning the electrochemical cell up to 15 kHz.
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Affiliation(s)
- Irshad Mohammad
- Laboratory of Spin Design, Institute of Cybernetics, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia
| | - Musa Ali Cambaz
- Helmholtz-Institute Ulm for Electrochemical Energy Storage (HIU), Helmholtzstr. 11, 89081, Ulm, Germany
| | - Ago Samoson
- Laboratory of Spin Design, Institute of Cybernetics, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia
| | - Maximilian Fichtner
- Helmholtz-Institute Ulm for Electrochemical Energy Storage (HIU), Helmholtzstr. 11, 89081, Ulm, Germany; Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), POB 3640, 76021, Karlsruhe, Germany
| | - Raiker Witter
- Laboratory of Spin Design, Institute of Cybernetics, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia; Helmholtz-Institute Ulm for Electrochemical Energy Storage (HIU), Helmholtzstr. 11, 89081, Ulm, Germany; Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), POB 3640, 76021, Karlsruhe, Germany; Institute of Quantum Optics, University Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany.
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2
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Callon M, Luder D, Malär AA, Wiegand T, Římal V, Lecoq L, Böckmann A, Samoson A, Meier BH. High and fast: NMR protein-proton side-chain assignments at 160 kHz and 1.2 GHz. Chem Sci 2023; 14:10824-10834. [PMID: 37829013 PMCID: PMC10566471 DOI: 10.1039/d3sc03539e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 09/16/2023] [Indexed: 10/14/2023] Open
Abstract
The NMR spectra of side-chain protons in proteins provide important information, not only about their structure and dynamics, but also about the mechanisms that regulate interactions between macromolecules. However, in the solid-state, these resonances are particularly difficult to resolve, even in relatively small proteins. We show that magic-angle-spinning (MAS) frequencies of 160 kHz, combined with a high magnetic field of 1200 MHz proton Larmor frequency, significantly improve their spectral resolution. We investigate in detail the gain for MAS frequencies between 110 and 160 kHz MAS for a model sample as well as for the hepatitis B viral capsid assembled from 120 core-protein (Cp) dimers. For both systems, we found a significantly improved spectral resolution of the side-chain region in the 1H-13C 2D spectra. The combination of 160 kHz MAS frequency with a magnetic field of 1200 MHz, allowed us to assign 61% of the aliphatic protons of Cp. The side-chain proton assignment opens up new possibilities for structural studies and further characterization of protein-protein or protein-nucleic acid interactions.
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Affiliation(s)
| | | | | | | | - Václav Římal
- Physical Chemistry, ETH Zürich 8093 Zürich Switzerland
| | - Lauriane Lecoq
- Molecular Microbiology and Structural Biochemistry (MMSB) UMR 5086, CNRS, Université de Lyon, Labex Ecofect 7 passage du Vercors 69367 Lyon France
| | - Anja Böckmann
- Molecular Microbiology and Structural Biochemistry (MMSB) UMR 5086, CNRS, Université de Lyon, Labex Ecofect 7 passage du Vercors 69367 Lyon France
| | - Ago Samoson
- Institute of Cybernetics, Spin Design Laboratory, Tallinn University of Technology Tallinn Estonia
| | - Beat H Meier
- Physical Chemistry, ETH Zürich 8093 Zürich Switzerland
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3
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Yuan EC, Chen P, Huang S, Org M, Samoson A, Chan JCC. Solid‐state heteronuclear multiple‐quantum spectroscopy under a magic‐angle spinning frequency of 150
kHz. J CHIN CHEM SOC-TAIP 2022. [DOI: 10.1002/jccs.202200063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Po‐Wen Chen
- Department of Chemistry National Taiwan University Taipei Republic of China
| | - Shing‐Jong Huang
- Instrumentation Center National Taiwan University Taipei Republic of China
| | - Mai‐Liis Org
- Institute of Health Technologies Tallinn University of Technology Tallinn Estonia
| | - Ago Samoson
- Institute of Health Technologies Tallinn University of Technology Tallinn Estonia
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4
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Paluch P, Augustyniak R, Org ML, Vanatalu K, Kaldma A, Samoson A, Stanek J. NMR Assignment of Methyl Groups in Immobilized Proteins Using Multiple-Bond 13C Homonuclear Transfers, Proton Detection, and Very Fast MAS. Front Mol Biosci 2022; 9:828785. [PMID: 35425812 PMCID: PMC9002630 DOI: 10.3389/fmolb.2022.828785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 02/08/2022] [Indexed: 11/13/2022] Open
Abstract
In nuclear magnetic resonance spectroscopy of proteins, methyl protons play a particular role as extremely sensitive reporters on dynamics, allosteric effects, and protein–protein interactions, accessible even in high-molecular-weight systems approaching 1 MDa. The notorious issue of their chemical shift assignment is addressed here by a joint use of solid-state 1H-detected methods at very fast (nearly 100 kHz) magic-angle spinning, partial deuteration, and high-magnetic fields. The suitability of a series of RF schemes is evaluated for the efficient coherence transfer across entire 13C side chains of methyl-containing residues, which is key for establishing connection between methyl and backbone 1H resonances. The performance of ten methods for recoupling of either isotropic 13C–13C scalar or anisotropic dipolar interactions (five variants of TOBSY, FLOPSY, DIPSI, WALTZ, RFDR, and DREAM) is evaluated experimentally at two state-of-the-art magic-angle spinning (55 and 94.5 kHz) and static magnetic field conditions (18.8 and 23.5 T). Model isotopically labeled compounds (alanine and Met-Leu-Phe tripeptide) and ILV-methyl and amide-selectively protonated, and otherwise deuterated chicken α-spectrin SH3 protein are used as convenient reference systems. Spin dynamics simulations in SIMPSON are performed to determine optimal parameters of these RF schemes, up to recently experimentally attained spinning frequencies (200 kHz) and B0 field strengths (28.2 T). The concept of linearization of 13C side chain by appropriate isotope labeling is revisited and showed to significantly increase sensitivity of methyl-to-backbone correlations. A resolution enhancement provided by 4D spectroscopy with non-uniform (sparse) sampling is demonstrated to remove ambiguities in simultaneous resonance assignment of methyl proton and carbon chemical shifts.
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Affiliation(s)
- Piotr Paluch
- Faculty of Chemistry, University of Warsaw, Warsaw, Poland
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Łódź, Poland
| | | | - Mai-Liis Org
- Tallin University of Technology, Tallinn, Estonia
| | | | - Ats Kaldma
- Tallin University of Technology, Tallinn, Estonia
| | - Ago Samoson
- Tallin University of Technology, Tallinn, Estonia
| | - Jan Stanek
- Faculty of Chemistry, University of Warsaw, Warsaw, Poland
- *Correspondence: Jan Stanek,
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5
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Yuan ECY, Huang SJ, Huang HC, Sinkkonen J, Oss A, Org ML, Samoson A, Tai HC, Chan JCC. Faster magic angle spinning reveals cellulose conformations in woods. Chem Commun (Camb) 2021; 57:4110-4113. [PMID: 33908496 DOI: 10.1039/d1cc01149a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a first report on the detection of three different C6 conformers of cellulose in spruce, as revealed by solid-state 1H-13C correlation spectra. The breakthrough in 1H resolution is achieved by magic-angle spinning in the regime of 150 kHz. The suppression of dense dipolar network of 1H provides inverse detected 13C spectra at a good sensitivity even in natural samples. We find that the glycosidic linkages are initially more ordered in spruce than maple, but a thermal treatment of spruce leads to a more heterogeneous packing order of the remaining cellulose fibrils.
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Affiliation(s)
- Eric Chung-Yueh Yuan
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Shing-Jong Huang
- Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan, Republic of China
| | - Hung-Chia Huang
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Jari Sinkkonen
- Innovation Centre for Biomaterials, Stora Enso AB, Nacka 13154, Sweden
| | - Andres Oss
- Tallinn University of Technology, Estonia.
| | | | | | - Hwan-Ching Tai
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Jerry Chun Chung Chan
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
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6
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Zhang Z, Oss A, Org ML, Samoson A, Li M, Tan H, Su Y, Yang J. Correction to "Selectively Enhanced 1H- 1H Correlations in Proton-Detected Solid-State NMR under Ultrafast MAS Conditions". J Phys Chem Lett 2020; 11:10157. [PMID: 33196205 DOI: 10.1021/acs.jpclett.0c03295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
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7
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Zhang Z, Oss A, Org ML, Samoson A, Li M, Tan H, Su Y, Yang J. Selectively Enhanced 1H- 1H Correlations in Proton-Detected Solid-State NMR under Ultrafast MAS Conditions. J Phys Chem Lett 2020; 11:8077-8083. [PMID: 32880459 DOI: 10.1021/acs.jpclett.0c02412] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Proton-detected solid-state NMR has emerged as a powerful analytical technique in structural elucidation via 1H-1H correlations, which are mostly established by broadband methods. We propose a new class of frequency-selective homonuclear recoupling methods to selectively enhance 1H-1H correlations of interest under ultrafast magic-angle spinning (MAS). These methods, dubbed as selective phase-optimized recoupling (SPR), can provide a sensitivity enhancement by a factor of ∼3 over the widely used radio-frequency-driven recoupling (RFDR) to observe 1HN-1HN contacts in a protonated tripeptide N-formyl-Met-Leu-Phe (fMLF) under 150 kHz MAS and are successfully utilized to probe a long-range 1H-1H contact in a pharmaceutical molecule, the hydrochloride form of pioglitazone (PIO-HCl). SPR is not only highly efficient in frequency-selective recoupling but also easy to implement, imparting to it great potential to probe 1H-1H contacts for the structural elucidation of organic solids such as proteins and pharmaceuticals under ultrafast MAS conditions.
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Affiliation(s)
- Zhengfeng Zhang
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Andres Oss
- Tallinn University of Technology, Tallinn 19086, Estonia
| | - Mai-Liis Org
- Tallinn University of Technology, Tallinn 19086, Estonia
| | - Ago Samoson
- Tallinn University of Technology, Tallinn 19086, Estonia
| | - Mingyue Li
- Pharmaceutical Sciences, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Huan Tan
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yongchao Su
- Pharmaceutical Sciences, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Jun Yang
- National Center for Magnetic Resonance in Wuhan, Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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8
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Schledorn M, Malär AA, Torosyan A, Penzel S, Klose D, Oss A, Org M, Wang S, Lecoq L, Cadalbert R, Samoson A, Böckmann A, Meier BH. Protein NMR Spectroscopy at 150 kHz Magic-Angle Spinning Continues To Improve Resolution and Mass Sensitivity. Chembiochem 2020; 21:2540-2548. [PMID: 32501630 PMCID: PMC7497035 DOI: 10.1002/cbic.202000341] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Indexed: 12/21/2022]
Abstract
Spectral resolution is the key to unleashing the structural and dynamic information contained in NMR spectra. Fast magic-angle spinning (MAS) has recently revolutionized the spectroscopy of biomolecular solids. Herein, we report a further remarkable improvement in the resolution of the spectra of four fully protonated proteins and a small drug molecule by pushing the MAS rotation frequency higher (150 kHz) than the more routinely used 100 kHz. We observed a reduction in the average homogeneous linewidth by a factor of 1.5 and a decrease in the observed linewidth by a factor 1.25. We conclude that even faster MAS is highly attractive and increases mass sensitivity at a moderate price in overall sensitivity.
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Affiliation(s)
| | | | | | | | - Daniel Klose
- Physical ChemistryETH Zürich8093ZürichSwitzerland
| | - Andres Oss
- Institute of Health TechnologiesTallinn University of TechnologyAkadeemia tee 15a12618TallinnEstonia
| | - Mai‐Liis Org
- Institute of Health TechnologiesTallinn University of TechnologyAkadeemia tee 15a12618TallinnEstonia
| | - Shishan Wang
- Institut de Biologie et Chimie des Protéines MMSB UMR 5086 CNRS/Université de Lyon, Labex Ecofect7 passage du Vercors69367LyonFrance
| | - Lauriane Lecoq
- Institut de Biologie et Chimie des Protéines MMSB UMR 5086 CNRS/Université de Lyon, Labex Ecofect7 passage du Vercors69367LyonFrance
| | | | - Ago Samoson
- Institute of Health TechnologiesTallinn University of TechnologyAkadeemia tee 15a12618TallinnEstonia
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines MMSB UMR 5086 CNRS/Université de Lyon, Labex Ecofect7 passage du Vercors69367LyonFrance
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9
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Witter S, Samoson A, Vilu R, Witter R. Screening of Nutraceuticals and Plant Extracts for Inhibition of Amyloid-β Fibrillation. J Alzheimers Dis 2020; 73:1003-1012. [DOI: 10.3233/jad-190758] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Steffi Witter
- School of Information Technologies, Department of Health Technologies, Tallinn University of Technology, Tallinn, Estonia
- School of Science, Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Ago Samoson
- School of Information Technologies, Department of Health Technologies, Tallinn University of Technology, Tallinn, Estonia
| | - Raivo Vilu
- Competence Center of Food and Fermentation Technology (TFTAK), Tallinn, Estonia
| | - Raiker Witter
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Eggenstein-Leopoldshafen, Germany
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10
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Abstract
We characterize a new generation of MAS probes, designed for 1H detection in solid and viscous structures. High top speed (currently 170 kHz), existence of a wide speed range and quick acceleration enable numerous new experiment categories. Most notably, massive biomolecular structures become amenable to a detailed structural and dynamics studies.
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11
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Malär AA, Smith-Penzel S, Camenisch GM, Wiegand T, Samoson A, Böckmann A, Ernst M, Meier BH. Quantifying proton NMR coherent linewidth in proteins under fast MAS conditions: a second moment approach. Phys Chem Chem Phys 2019; 21:18850-18865. [PMID: 31432055 DOI: 10.1039/c9cp03414e] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Proton detected solid-state NMR under fast magic-angle-spinning (MAS) conditions is currently redefining the applications of solid-state NMR, in particular in structural biology. Understanding the contributions to the spectral linewidth is thereby of paramount importance. When disregarding the sample-dependent inhomogeneous contributions, the NMR proton linewidth is defined by homogeneous broadening, which has incoherent and coherent contributions. Understanding and disentangling these different contributions in multi-spin systems like proteins is still an open issue. The coherent contribution is mainly caused by the dipolar interaction under MAS and is determined by the molecular structure and the proton chemical shifts. Numerical simulation approaches based on numerically exact direct integration of the Liouville-von Neumann equation can give valuable information about the lineshape, but are limited to small spin systems (<12 spins). We present an alternative simulation method for the coherent contributions based on the rapid and partially analytic calculation of the second moments of large spin systems. We first validate the method on a simple system by predicting the 19F linewidth in CaF2 under MAS. We compare simulation results to experimental data for microcrystalline ubiquitin (deuterated 100% back-exchanged at 110 kHz and fully-protonated at 125 kHz). Our results quantitatively explain the observed linewidth per-residue basis for the vast majority of residues.
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Affiliation(s)
- Alexander A Malär
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
| | - Susanne Smith-Penzel
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
| | - Gian-Marco Camenisch
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
| | - Thomas Wiegand
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
| | - Ago Samoson
- School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia. and NMR Institute MTÜ, Tallinn, Estonia
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines, Bases Moléculaires et Structurales des Systèmes Infectieux, Labex Ecofect, UMR 5086 CNRS, Université de Lyon, 7 passage du Vercors, 69367 Lyon, France.
| | - Matthias Ernst
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
| | - Beat H Meier
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
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12
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Penzel S, Oss A, Org ML, Samoson A, Böckmann A, Ernst M, Meier BH. Spinning faster: protein NMR at MAS frequencies up to 126 kHz. J Biomol NMR 2019; 73:19-29. [PMID: 30680507 PMCID: PMC6441448 DOI: 10.1007/s10858-018-0219-9] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Accepted: 12/05/2018] [Indexed: 05/05/2023]
Abstract
We report linewidth and proton T1, T1ρ and T2' relaxation data of the model protein ubiquitin acquired at MAS frequencies up to 126 kHz. We find a predominantly linear improvement in linewidths and coherence decay times of protons with increasing spinning frequency in the range from 93 to 126 kHz. We further attempt to gain insight into the different contributions to the linewidth at fast MAS using site-specific analysis of proton relaxation parameters and present bulk relaxation times as a function of the MAS frequency. For microcrystalline fully-protonated ubiquitin, inhomogeneous contributions are only a minor part of the proton linewidth, and at 126 kHz MAS coherent effects are still dominating. We furthermore present site-specific proton relaxation rate constants during a spinlock at 126 kHz MAS, as well as MAS-dependent bulk T1ρ (1HN).
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Affiliation(s)
- Susanne Penzel
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Andres Oss
- NMR Instituut, Tartu Teaduspark, Tehnomeedikum, Tallinn University of Technology, Akadeemia tee 15a, 19086, Tallinn, Estonia
| | - Mai-Liis Org
- NMR Instituut, Tartu Teaduspark, Tehnomeedikum, Tallinn University of Technology, Akadeemia tee 15a, 19086, Tallinn, Estonia
| | - Ago Samoson
- NMR Instituut, Tartu Teaduspark, Tehnomeedikum, Tallinn University of Technology, Akadeemia tee 15a, 19086, Tallinn, Estonia.
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines, UMR 5086 CNRS/Université de Lyon 1, Labex ECOFECT, 7, Passage du Vercors, 69367, Lyon, France.
| | - Matthias Ernst
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland.
| | - Beat H Meier
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland.
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13
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Abstract
Plaque formation due to amyloid-β oligomerization and fibrillation is a key issue for its deposition in the brains of dementia and Alzheimer's disease patients. Related drugs preventing this peptide fibril accumulation bear the potential of considerable medical and social value. In this study, we performed in vitro fibrillation inhibition tests with eight different medical plant extracts and nutraceuticals using fluorescence spectroscopy. Successful inhibition of the following plant extracts and nutraceuticals were obtained: Withania somnifera, Centella asiatica, Bacopa monnieri, and Convolvulus pluricaulis, providing new drug candidates for the prevention and treatment of Alzheimer's disease.
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Affiliation(s)
- Steffi Witter
- Department of Health Technologies, School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia
| | - Raiker Witter
- Department of Health Technologies, School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia
- Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Eggenstein-Leopoldshafen, Germany
| | - Raivo Vilu
- Competence Center of Food and Fermentation Technology (TFTAK), Tallinn, Estonia
| | - Ago Samoson
- Department of Health Technologies, School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia
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14
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Titma T, Günther U, Ludwig C, Pikta M, Zemtsovskaja G, Viigimaa M, Samoson A. The metabolic pattern could be used for early detection of stable ischemic heart disease and hypertensive heart disease. Rev Epidemiol Sante Publique 2018. [DOI: 10.1016/j.respe.2018.05.243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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15
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Sternberg U, Witter R, Kuprov I, Lamley JM, Oss A, Lewandowski JR, Samoson A. 1H line width dependence on MAS speed in solid state NMR - Comparison of experiment and simulation. J Magn Reson 2018; 291:32-39. [PMID: 29679841 DOI: 10.1016/j.jmr.2018.04.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 04/04/2018] [Accepted: 04/06/2018] [Indexed: 06/08/2023]
Abstract
Recent developments in magic angle spinning (MAS) technology permit spinning frequencies of ≥100 kHz. We examine the effect of such fast MAS rates upon nuclear magnetic resonance proton line widths in the multi-spin system of β-Asp-Ala crystal. We perform powder pattern simulations employing Fokker-Plank approach with periodic boundary conditions and 1H-chemical shift tensors calculated using the bond polarization theory. The theoretical predictions mirror well the experimental results. Both approaches demonstrate that homogeneous broadening has a linear-quadratic dependency on the inverse of the MAS spinning frequency and that, at the faster end of the spinning frequencies, the residual spectral line broadening becomes dominated by chemical shift distributions and susceptibility effects even for crystalline systems.
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Affiliation(s)
- Ulrich Sternberg
- Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; COSMOS GbR, Jena, Germany.
| | - Raiker Witter
- School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia; Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; NMR Institute MTÜ, Tallinn, Estonia
| | - Ilya Kuprov
- School of Chemistry, University of Southampton, UK
| | | | - Andres Oss
- School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia; NMR Institute MTÜ, Tallinn, Estonia
| | | | - Ago Samoson
- School of Information Technologies, Tallinn University of Technology, Tallinn, Estonia; NMR Institute MTÜ, Tallinn, Estonia
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16
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Lin YL, Cheng YS, Ho CI, Guo ZH, Huang SJ, Org ML, Oss A, Samoson A, Chan JCC. Preparation of fibril nuclei of beta-amyloid peptides in reverse micelles. Chem Commun (Camb) 2018; 54:10459-10462. [DOI: 10.1039/c8cc05882b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Protofibrils of beta-amyloid peptides formed by fibril nuclei incubated in reverse micelles.
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Affiliation(s)
- Yen-Ling Lin
- Department of Chemistry, National Taiwan University
- Taipei
- Taiwan
| | - Yu-Sheng Cheng
- Department of Chemistry, National Taiwan University
- Taipei
- Taiwan
| | - Cheng-I Ho
- Department of Chemistry, National Taiwan University
- Taipei
- Taiwan
| | - Zhong-Hong Guo
- Department of Chemistry, National Taiwan University
- Taipei
- Taiwan
| | - Shing-Jong Huang
- Instrumentation Center
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Mai-Liis Org
- Institute of Health Technologies, Tallinn University of Technology
- Tallinn
- Estonia
| | - Andres Oss
- Institute of Health Technologies, Tallinn University of Technology
- Tallinn
- Estonia
| | - Ago Samoson
- Institute of Health Technologies, Tallinn University of Technology
- Tallinn
- Estonia
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17
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Öster C, Kosol S, Hartlmüller C, Lamley JM, Iuga D, Oss A, Org ML, Vanatalu K, Samoson A, Madl T, Lewandowski JR. Characterization of Protein-Protein Interfaces in Large Complexes by Solid-State NMR Solvent Paramagnetic Relaxation Enhancements. J Am Chem Soc 2017; 139:12165-12174. [PMID: 28780861 PMCID: PMC5590091 DOI: 10.1021/jacs.7b03875] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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Solid-state NMR is becoming a viable
alternative for obtaining
information about structures and dynamics of large biomolecular complexes,
including ones that are not accessible to other high-resolution biophysical
techniques. In this context, methods for probing protein–protein
interfaces at atomic resolution are highly desirable. Solvent paramagnetic
relaxation enhancements (sPREs) proved to be a powerful method for
probing protein–protein interfaces in large complexes in solution
but have not been employed toward this goal in the solid state. We
demonstrate that 1H and 15N relaxation-based
sPREs provide a powerful tool for characterizing intermolecular interactions
in large assemblies in the solid state. We present approaches for
measuring sPREs in practically the entire range of magic angle spinning
frequencies used for biomolecular studies and discuss their benefits
and limitations. We validate the approach on crystalline GB1, with
our experimental results in good agreement with theoretical predictions.
Finally, we use sPREs to characterize protein–protein interfaces
in the GB1 complex with immunoglobulin G (IgG). Our results suggest
the potential existence of an additional binding site and provide
new insights into GB1:IgG complex structure that amend and revise
the current model available from studies with IgG fragments. We demonstrate
sPREs as a practical, widely applicable, robust, and very sensitive
technique for determining intermolecular interaction interfaces in
large biomolecular complexes in the solid state.
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Affiliation(s)
- Carl Öster
- Department of Chemistry, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Simone Kosol
- Department of Chemistry, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Christoph Hartlmüller
- Center for Integrated Protein Science, Department of Chemistry, Munich Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München , Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Jonathan M Lamley
- Department of Chemistry, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Dinu Iuga
- Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Andres Oss
- Institute of Health Technologies, Tallinn University of Technology , Akadeemia tee 15a, 19086 Tallinn, Estonia
| | - Mai-Liis Org
- Institute of Health Technologies, Tallinn University of Technology , Akadeemia tee 15a, 19086 Tallinn, Estonia
| | - Kalju Vanatalu
- Institute of Health Technologies, Tallinn University of Technology , Akadeemia tee 15a, 19086 Tallinn, Estonia
| | - Ago Samoson
- Institute of Health Technologies, Tallinn University of Technology , Akadeemia tee 15a, 19086 Tallinn, Estonia
| | - Tobias Madl
- Center for Integrated Protein Science, Department of Chemistry, Munich Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.,Institute of Structural Biology, Helmholtz Zentrum München , Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany.,Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz , Harrachgasse 21, 8010 Graz, Austria
| | - Józef R Lewandowski
- Department of Chemistry, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, U.K
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18
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Varlec J, Krajnc A, Mazaj M, Ristić A, Vanatalu K, Oss A, Samoson A, Kaučič V, Mali G. Dehydration of AlPO4-34 studied by variable-temperature NMR, XRD and first-principles calculations. NEW J CHEM 2016. [DOI: 10.1039/c5nj02838h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complementary techniques elucidate water–framework interactions in different states of dehydration, two of which have not been observed before.
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Affiliation(s)
- Jure Varlec
- National Institute of Chemistry
- SI-1001 Ljubljana
- Slovenia
| | - Andraž Krajnc
- National Institute of Chemistry
- SI-1001 Ljubljana
- Slovenia
- Jozef Stefan International Postgraduate School
- SI-1000 Ljubljana
| | - Matjaž Mazaj
- National Institute of Chemistry
- SI-1001 Ljubljana
- Slovenia
| | - Alenka Ristić
- National Institute of Chemistry
- SI-1001 Ljubljana
- Slovenia
| | - Kalju Vanatalu
- Technomedicum,
- Tallinn University of Technology
- Tallinn
- Estonia
| | - Andres Oss
- Technomedicum,
- Tallinn University of Technology
- Tallinn
- Estonia
| | - Ago Samoson
- Technomedicum,
- Tallinn University of Technology
- Tallinn
- Estonia
| | | | - Gregor Mali
- National Institute of Chemistry
- SI-1001 Ljubljana
- Slovenia
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19
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Penzel S, Smith AA, Agarwal V, Hunkeler A, Org ML, Samoson A, Böckmann A, Ernst M, Meier BH. Protein resonance assignment at MAS frequencies approaching 100 kHz: a quantitative comparison of J-coupling and dipolar-coupling-based transfer methods. J Biomol NMR 2015; 63:165-186. [PMID: 26267840 DOI: 10.1007/s10858-015-9975-y] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 06/25/2015] [Indexed: 06/04/2023]
Abstract
We discuss the optimum experimental conditions to obtain assignment spectra for solid proteins at magic-angle spinning (MAS) frequencies around 100 kHz. We present a systematic examination of the MAS dependence of the amide proton T 2' times and a site-specific comparison of T 2' at 93 kHz versus 60 kHz MAS frequency. A quantitative analysis of transfer efficiencies of building blocks, as they are used for typical 3D experiments, was performed. To do this, we compared dipolar-coupling and J-coupling based transfer steps. The building blocks were then combined into 3D experiments for sequential resonance assignment, where we evaluated signal-to-noise ratio and information content of the different 3D spectra in order to identify the best assignment strategy. Based on this comparison, six experiments were selected to optimally assign the model protein ubiquitin, solely using spectra acquired at 93 kHz MAS. Within 3 days of instrument time, the required spectra were recorded from which the backbone resonances have been assigned to over 96%.
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Affiliation(s)
- Susanne Penzel
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Albert A Smith
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Vipin Agarwal
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Mai-Liis Org
- NMR Instituut, Tartu Teadus, Tehnomeedikum, Tallinn University of Technology, Akadeemia tee 15a, 19086, Tallinn, Estonia
| | - Ago Samoson
- NMR Instituut, Tartu Teadus, Tehnomeedikum, Tallinn University of Technology, Akadeemia tee 15a, 19086, Tallinn, Estonia.
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines, UMR 5086 CNRS/Université de Lyon 1, 7, passage du Vercors, 69367, Lyon, France.
| | - Matthias Ernst
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland.
| | - Beat H Meier
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland.
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20
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Lamley JM, Iuga D, Öster C, Sass HJ, Rogowski M, Oss A, Past J, Reinhold A, Grzesiek S, Samoson A, Lewandowski JR. Solid-State NMR of a Protein in a Precipitated Complex with a Full-Length Antibody. J Am Chem Soc 2014; 136:16800-6. [DOI: 10.1021/ja5069992] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jonathan M. Lamley
- Department
of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Dinu Iuga
- Department
of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K
| | - Carl Öster
- Department
of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K
| | | | - Marco Rogowski
- Biozentrum, University of Basel, 4056 Basel, Switzerland
| | - Andres Oss
- NMR
Institute and Tehnomeedikum, Tallinn University of Technology, Akadeemia
tee 15a, 19086 Tallinn, Estonia
| | - Jaan Past
- NMR
Institute and Tehnomeedikum, Tallinn University of Technology, Akadeemia
tee 15a, 19086 Tallinn, Estonia
| | - Andres Reinhold
- NMR
Institute and Tehnomeedikum, Tallinn University of Technology, Akadeemia
tee 15a, 19086 Tallinn, Estonia
| | | | - Ago Samoson
- NMR
Institute and Tehnomeedikum, Tallinn University of Technology, Akadeemia
tee 15a, 19086 Tallinn, Estonia
| | - Józef R. Lewandowski
- Department
of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, U.K
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21
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Agarwal V, Penzel S, Szekely K, Cadalbert R, Testori E, Oss A, Past J, Samoson A, Ernst M, Böckmann A, Meier BH. De-novo-3D-Strukturaufklärung mit Proteinmengen unter einem Milligramm mittels 100-kHz-MAS-Festkörper-NMR-Spektroskopie. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405730] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Agarwal V, Penzel S, Szekely K, Cadalbert R, Testori E, Oss A, Past J, Samoson A, Ernst M, Böckmann A, Meier BH. De Novo 3D Structure Determination from Sub-milligram Protein Samples by Solid-State 100 kHz MAS NMR Spectroscopy. Angew Chem Int Ed Engl 2014; 53:12253-6. [DOI: 10.1002/anie.201405730] [Citation(s) in RCA: 263] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Indexed: 01/10/2023]
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23
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Stoyanova R, Ivanova S, Zhecheva E, Samoson A, Simova S, Tzvetkova P, Barra AL. Correlations between lithium local structure and electrochemistry of layered LiCo1−2xNixMnxO2oxides:7Li MAS NMR and EPR studies. Phys Chem Chem Phys 2014; 16:2499-507. [DOI: 10.1039/c3cp54438a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Agarwal V, Tuherm T, Reinhold A, Past J, Samoson A, Ernst M, Meier BH. Amplitude-modulated low-power decoupling sequences for fast magic-angle spinning NMR. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.07.073] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Hou G, Yan S, Sun S, Han Y, Byeon IJL, Ahn J, Concel J, Samoson A, Gronenborn AM, Polenova T. Spin diffusion driven by R-symmetry sequences: applications to homonuclear correlation spectroscopy in MAS NMR of biological and organic solids. J Am Chem Soc 2011; 133:3943-53. [PMID: 21361320 PMCID: PMC3148607 DOI: 10.1021/ja108650x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a family of homonuclear (13)C-(13)C magic angle spinning spin diffusion experiments, based on R2(n)(v) (n = 1 and 2, v = 1 and 2) symmetry sequences. These experiments are well suited for (13)C-(13)C correlation spectroscopy in biological and organic systems and are especially advantageous at very fast MAS conditions, where conventional PDSD and DARR experiments fail. At very fast MAS frequencies the R2(1)(1), R2(2)(1), and R2(2)(2) sequences result in excellent quality correlation spectra both in model compounds and in proteins. Under these conditions, individual R2(n)(v) display different polarization transfer efficiency dependencies on isotropic chemical shift differences: R2(2)(1) recouples efficiently both small and large chemical shift differences (in proteins these correspond to aliphatic-to-aliphatic and carbonyl-to-aliphatic correlations, respectively), while R2(1)(1) and R2(2)(2) exhibit the maximum recoupling efficiency for the aliphatic-to-aliphatic or carbonyl-to-aliphatic correlations, respectively. At moderate MAS frequencies (10-20 kHz), all R2(n)(v) sequences introduced in this work display similar transfer efficiencies, and their performance is very similar to that of PDSD and DARR. Polarization transfer dynamics and chemical shift dependencies of these R2-driven spin diffusion (RDSD) schemes are experimentally evaluated and investigated by numerical simulations for [U-(13)C,(15)N]-alanine and the [U-(13)C,(15)N] N-formyl-Met-Leu-Phe (MLF) tripeptide. Further applications of this approach are illustrated for several proteins: spherical assemblies of HIV-1 U-(13)C,(15)N CA protein, U-(13)C,(15)N-enriched dynein light chain DLC8, and sparsely (13)C/uniformly (15)N enriched CAP-Gly domain of dynactin. Due to the excellent performance and ease of implementation, the presented R2(n)(v) symmetry sequences are expected to be of wide applicability in studies of proteins and protein assemblies as well as other organic solids by MAS NMR spectroscopy.
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Affiliation(s)
- Guangjin Hou
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
| | - Si Yan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Shangjin Sun
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Yun Han
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
| | - In-Ja L. Byeon
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
- Department of Structural Biology, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
| | - Jinwoo Ahn
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
- Department of Structural Biology, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
| | - Jason Concel
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
- Department of Structural Biology, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
| | - Ago Samoson
- Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia
- Physics Department, University of Warwick, Coventry, UK
| | - Angela M. Gronenborn
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
- Department of Structural Biology, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
| | - Tatyana Polenova
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
- Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, PA 15261, United States
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26
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Howes AP, Vedishcheva NM, Samoson A, Hanna JV, Smith ME, Holland D, Dupree R. Boron environments in Pyrex® glass—a high resolution, Double-Rotation NMR and thermodynamic modelling study. Phys Chem Chem Phys 2011; 13:11919-28. [DOI: 10.1039/c1cp20771g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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27
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Wong A, Howes AP, Yates JR, Watts A, Anupõld T, Past J, Samoson A, Dupree R, Smith ME. Ultra-high resolution 17O solid-state NMR spectroscopy of biomolecules: A comprehensive spectral analysis of monosodium L-glutamate·monohydrate. Phys Chem Chem Phys 2011; 13:12213-24. [DOI: 10.1039/c1cp20629j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Becker-Baldus J, Kemp TF, Past J, Reinhold A, Samoson A, Brown SP. Longer-range distances by spinning-angle-encoding solid-state NMR spectroscopy. Phys Chem Chem Phys 2011; 13:4514-8. [DOI: 10.1039/c0cp02364g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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29
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Engelhardt G, Radeglia R, Lohse U, Samoson A, Lippmaa E. Bestimmung der mittleren SiOSi-Bindungswinkel in dealuminiertem ZSM-5- Zeolith (Silicalit) aus den hochaufgelösten 29Si-MAS-NMR-Spektren. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19850250708] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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30
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Engelhardt G, Zeigan D, Hoebbel D, Samoson A, Lippmaa E. Nachweis von Strukturdeformationen in festen siliciumorganischen Käfigverbindungen mit der hochauflösenden 29Si-NMR. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19820220819] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Hung I, Wong A, Howes AP, Anupõld T, Samoson A, Smith ME, Holland D, Brown SP, Dupree R. Separation of isotropic chemical and second-order quadrupolar shifts by multiple-quantum double rotation NMR. J Magn Reson 2009; 197:229-236. [PMID: 19201231 DOI: 10.1016/j.jmr.2009.01.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Revised: 01/06/2009] [Accepted: 01/06/2009] [Indexed: 05/27/2023]
Abstract
Using a two-dimensional multiple-quantum (MQ) double rotation (DOR) experiment the contributions of the chemical shift and quadrupolar interaction to isotropic resonance shifts can be completely separated. Spectra were acquired using a three-pulse triple-quantum z-filtered pulse sequence and subsequently sheared along both the nu(1) and nu(2) dimensions. The application of this method is demonstrated for both crystalline (RbNO(3)) and amorphous samples (vitreous B(2)O(3)). The existence of the two rubidium isotopes ((85)Rb and (87)Rb) allows comparison of results for two nuclei with different spins (I=3/2 and 5/2), as well as different dipole and quadrupole moments in a single chemical compound. Being only limited by homogeneous line broadening and sample crystallinity, linewidths of approximately 0.1 and 0.2 ppm can be measured for (87)Rb in the quadrupolar and chemical shift dimensions, enabling highly accurate determination of the isotropic chemical shift and the quadrupolar product, P(Q). For vitreous B(2)O(3), the use of MQDOR allows the chemical shift and electric field gradient distributions to be directly determined-information that is difficult to obtain otherwise due to the presence of second-order quadrupolar broadening.
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Affiliation(s)
- Ivan Hung
- Physics Department, University of Warwick, Coventry, UK
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32
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Schneider D, Toufar H, Samoson A, Freude D. (17)O DOR and other solid-state NMR studies concerning the basic properties of zeolites LSX. Solid State Nucl Magn Reson 2009; 35:87-92. [PMID: 19304460 DOI: 10.1016/j.ssnmr.2009.02.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2008] [Revised: 02/10/2009] [Accepted: 02/16/2009] [Indexed: 05/27/2023]
Abstract
We demonstrate complementary (1)H, (17)O, (27)Al and (29)Si measurements for basic low-silica-X zeolites, which were unloaded and pyrrole and formic acid-loaded. It was found that the acid-base-system is not stabile, if the loading exceeds one pyrrole molecule or two formic acid molecules per supercage.(17)O DOR NMR spectra exhibit at least four lines, which are broadened by a distribution of chemical shifts in a similar extend as the (29)Si MAS NMR spectra are broadened by distribution of Si-O-Al angles. A strong cation influence upon (17)O shifts was observed. But there was no strong influence of the acid molecules on the mean value of the (17)O shift of the spectra.
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Affiliation(s)
- Denis Schneider
- Bruker BioSpin GmbH, Silberstreifen, 76287 Rheinstetten, Germany
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33
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Abstract
In this contribution, we extend the theory of symmetry-based pulse sequences of types CN(n) (nu) and RN(n) (nu) in magic-angle-spinning nuclear resonance spectroscopy [M. H. Levitt, in Encyclopedia of Nuclear Magnetic Resonance, edited by D. M. Grant and R. K. Harris (Wiley, Chichester, 2002), Vol. 9]. to the case of rotating the sample simultaneously around two different angles with respect to the external magnetic field (double-rotation). We consider the case of spin-1/2 nuclei in general and the case of half-integer quadrupolar nuclei that are subjected to weak radio frequency pulses operating selectively on the central-transition polarizations. The transformation properties of the homonuclear dipolar interactions and J-couplings under central-transition-selective spin rotations are presented. We show that the pulse sequence R2(2) (1)R2(2) (-1) originally developed for homonuclear dipolar recoupling of half-integer quadrupolar nuclei under magic-angle-spinning conditions [M. Eden, D. Zhou, and J. Yu, Chem. Phys. Lett. 431, 397 (2006)] may be used for the same purpose in the case of double rotation, if the radio frequency pulses are synchronized with the outer rotation of the sample. We apply this sequence, sandwiched by central-transition selective 90 degrees pulses, to excite double-quantum coherences in homonuclear spin systems consisting of (23)Na and (27)Al nuclei.
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Affiliation(s)
- Andreas Brinkmann
- Physical Chemistry/Solid State NMR, Institute for Molecules and Materials, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands.
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34
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Wong A, Howes AP, Parkinson B, Anupõld T, Samoson A, Holland D, Dupree R. High-resolution 17O double-rotation NMR characterization of ring and non-ring oxygen in vitreous B2O3. Phys Chem Chem Phys 2009; 11:7061-8. [DOI: 10.1039/b906501f] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Uldry AC, Griffin JM, Yates JR, Pérez-Torralba M, Santa María MD, Webber AL, Beaumont MLL, Samoson A, Claramunt RM, Pickard CJ, Brown SP. Quantifying Weak Hydrogen Bonding in Uracil and 4-Cyano-4‘-ethynylbiphenyl: A Combined Computational and Experimental Investigation of NMR Chemical Shifts in the Solid State. J Am Chem Soc 2008; 130:945-54. [DOI: 10.1021/ja075892i] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Anne-Christine Uldry
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - John M. Griffin
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Jonathan R. Yates
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Marta Pérez-Torralba
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - M. Dolores Santa María
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Amy L. Webber
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Maximus L. L. Beaumont
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Ago Samoson
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Rosa María Claramunt
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Chris J. Pickard
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - Steven P. Brown
- School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, U.K., Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., TCM Group, Cavendish Laboratory, University of Cambridge, 19 J J Thomson Avenue, Cambridge CB3 OHE, U.K., Departamento de Química Orgánica y Bio-Orgánica, UNED, Senda del Rey 9, 28040 Madrid, Spain, and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
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36
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Wong A, Hung I, Howes AP, Anupõld T, Past J, Samoson A, Brown SP, Smith ME, Dupree R. The determination of 17O NMR parameters of hydroxyl oxygen: a combined deuteration and DOR approach. Magn Reson Chem 2007; 45 Suppl 1:S68-S72. [PMID: 18157798 DOI: 10.1002/mrc.2088] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The direct detection of hydroxyl oxygen (O-H) by (17)O double-rotation (DOR) NMR is very challenging because of the strong O-H dipole interaction. It is shown that deuteration of the hydroxyl site overcomes this using glycine.HCl as an illustration. Two well-separated sets of narrow (linewidth approximately 80-100 Hz) resonances with their spinning-sidebands are observed for the carboxyl and hydroxyl oxygens in the DOR spectrum of [(17)O,(2)H]glycine.HCl. The chemical shift anisotropy of these sites is obtained from a simulation of the DOR spinning-sideband intensities. The chemical shift span (Omega) for the carboxyl oxygen is found to be much larger than that of the hydroxyl oxygen, with Omega values of 540 +/- 15 and 210 +/- 10 ppm, respectively.
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Affiliation(s)
- Alan Wong
- Physics Department, University of Warwick, Coventry, UK
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37
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Griffin JM, Tripon C, Samoson A, Filip C, Brown SP. Low-load rotor-synchronised Hahn-echo pulse train (RS-HEPT) 1H decoupling in solid-state NMR: factors affecting MAS spin-echo dephasing times. Magn Reson Chem 2007; 45 Suppl 1:S198-S208. [PMID: 18098353 DOI: 10.1002/mrc.2145] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Transverse dephasing times T(2)' in spin-echo MAS NMR using rotor-synchronised Hahn-echo pulse-train (RS-HEPT) low-load (1)H decoupling are evaluated. Experiments were performed at 300 and 600 MHz for (13)CH-labelled L-alanine and (15)NH(delta)-labelled L-histidine.HCl.H(2)O, together with SPINEVOLUTION simulations for a ten-spin system representing the crystal structure environment of the (13)CH carbon in L-alanine. For 30 kHz MAS and nu(1)((1)H) = 100 kHz at 300 MHz, a RS-HEPT T(2)' value of 17 +/- 1 ms was obtained for (13)CH-labelled L-alanine which is approximately 50% of the XiX T(2)' value of 33 +/- 2 ms. Optimum RS-HEPT decoupling performance is observed for a relative phase of alternate RS-HEPT pi-pulses, Deltaphi = phi'- phi, between 40 and 60 degrees . For experiments at 600 MHz and 30 kHz MAS with (13)CH-labelled L-alanine, the best RS-HEPT (nu(1)((1)H) = 100 kHz) T(2)' value was 3 times longer than that observed for low-power continuously applied sequences with nu(1)((1)H) < or =40 kHz, i.e. corresponding to the same average power dissipated in the probe. A marked improvement in RS-HEPT (1)H decoupling is observed for increasing MAS frequency: at 55.6 kHz MAS, a best RS-HEPT T(2)' value of 34 +/- 5 ms was recorded for (13)CH-labelled L-alanine. Much improved RS-HEPT broadband performance was also observed at 55.6 kHz MAS as compared to 30 kHz MAS.
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Affiliation(s)
- John M Griffin
- Department of Physics, University of Warwick, Coventry, UK
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38
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Hung I, Wong A, Howes AP, Anupõld T, Past J, Samoson A, Mo X, Wu G, Smith ME, Brown SP, Dupree R. Determination of NMR interaction parameters from double rotation NMR. J Magn Reson 2007; 188:246-59. [PMID: 17707665 DOI: 10.1016/j.jmr.2007.07.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 07/18/2007] [Accepted: 07/19/2007] [Indexed: 05/16/2023]
Abstract
It is shown that the anisotropic NMR parameters for half-integer quadrupolar nuclei can be determined using double rotation (DOR) NMR at a single magnetic field with comparable accuracy to multi-field static and MAS experiments. The (17)O nuclei in isotopically enriched l-alanine and OPPh(3) are used as illustrations. The anisotropic NMR parameters are obtained from spectral simulation of the DOR spinning sideband intensities using a computer program written with the GAMMA spin-simulation libraries. Contributions due to the quadrupolar interaction, chemical shift anisotropy, dipolar coupling and J coupling are included in the simulations. In l-alanine the oxygen chemical shift span is 455 +/- 20 ppm and 350 +/- 20 ppm for the O1 and O2 sites, respectively, and the Euler angles are determined to an accuracy of +/- 5-10 degrees . For cases where effects due to heteronuclear J and dipolar coupling are observed, it is possible to determine the angle between the internuclear vector and the principal axis of the electric field gradient (EFG). Thus, the orientation of the major components of both the EFG and chemical shift tensors (i.e., V(33) and delta(33)) in the molecular frame may be obtained from the relative intensity of the split DOR peaks. For OPPh(3) the principal axis of the (17)O EFG is found to be close to the O-P bond, and the (17)O-(31)P one-bond J coupling ((1)J(OP)=161 +/- 2 Hz) is determined to a much higher accuracy than previously.
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Affiliation(s)
- I Hung
- Physics Department, University of Warwick, Coventry, UK
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39
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Carravetta M, Johannessen OG, Levitt MH, Heinmaa I, Stern R, Samoson A, Horsewill AJ, Murata Y, Komatsu K. Cryogenic NMR spectroscopy of endohedral hydrogen-fullerene complexes. J Chem Phys 2007; 124:104507. [PMID: 16542088 DOI: 10.1063/1.2174012] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have observed 1H NMR spectra of hydrogen molecules trapped inside modified fullerene cages under cryogenic conditions. Experiments on static samples were performed at sample temperatures down to 4.3 K, while magic-angle-spinning (MAS) experiments were performed at temperatures down to 20 K at spinning frequencies of 15 kHz. Both types of NMR spectra show a large increase in the intramolecular 1H-1H dipolar coupling at temperatures below 50 K, revealing thermal selection of a small number of spatial rotational states. The static and MAS spectra were compared to estimate the degree of sample heating in high-speed cryogenic MAS-NMR experiments. The cryogenic MAS-NMR data show that the site resolution of magic-angle-spinning NMR may be combined with the high signal strength of cryogenic operation and that cryogenic phenomena may be studied with chemical site selectivity.
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Affiliation(s)
- M Carravetta
- School of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
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40
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Wickramasinghe NP, Kotecha M, Samoson A, Past J, Ishii Y. Sensitivity enhancement in (13)C solid-state NMR of protein microcrystals by use of paramagnetic metal ions for optimizing (1)H T(1) relaxation. J Magn Reson 2007; 184:350-6. [PMID: 17126048 PMCID: PMC1839830 DOI: 10.1016/j.jmr.2006.10.012] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2006] [Revised: 10/21/2006] [Accepted: 10/24/2006] [Indexed: 05/04/2023]
Abstract
We discuss a simple approach to enhance sensitivity for (13)C high-resolution solid-state NMR for proteins in microcrystals by reducing (1)H T(1) relaxation times with paramagnetic relaxation reagents. It was shown that (1)H T(1) values can be reduced from 0.4-0.8s to 60-70 ms for ubiquitin and lysozyme in D(2)O in the presence of 10 mM Cu(II)Na(2)EDTA without substantial degradation of the resolution in (13)C CPMAS spectra. Faster signal accumulation using the shorter (1)H T(1) attained by paramagnetic doping provided sensitivity enhancements of 1.4-2.9 for these proteins, reducing the experimental time for a given signal-to-noise ratio by a factor of 2.0-8.4. This approach presented here is likely to be applicable to various other proteins in order to enhance sensitivity in (13)C high-resolution solid-state NMR spectroscopy.
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Affiliation(s)
- Nalinda P Wickramasinghe
- Department of Chemistry, University of Illinois at Chicago, 845 W Taylor St., Chicago, IL 60607, USA
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41
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Carravetta M, Danquigny A, Mamone S, Cuda F, Johannessen OG, Heinmaa I, Panesar K, Stern R, Grossel MC, Horsewill AJ, Samoson A, Murata M, Murata Y, Komatsu K, Levitt MH. Solid-state NMR of endohedral hydrogen–fullerene complexes. Phys Chem Chem Phys 2007; 9:4879-94. [PMID: 17912417 DOI: 10.1039/b707075f] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present an overview of solid-state NMR studies of endohedral H(2)-fullerene complexes, including (1)H and (13)C NMR spectra, (1)H and (13)C spin relaxation studies, and the results of (1)H dipole-dipole recoupling experiments. The available data involves three different endohedral H(2)-fullerene complexes, studied over a wide range of temperatures and applied magnetic fields. The symmetry of the cage influences strongly the motionally-averaged nuclear spin interactions of the endohedral H(2) species, as well as its spin relaxation behaviour. In addition, the non-bonding interactions between fullerene cages are influenced by the presence of endohedral hydrogen molecules. The review also presents several pieces of experimental data which are not yet understood, one example being the structured (1)H NMR lineshapes of endohedral H(2) molecules trapped in highly symmetric cages at cryogenic temperatures. This review demonstrates the richness of NMR phenomena displayed by H(2)-fullerene complexes, especially in the cryogenic regime.
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Affiliation(s)
- M Carravetta
- School of Chemistry, University of Southampton, Southampton, UK.
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42
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Hung I, Howes A, Anupõld T, Samoson A, Massiot D, Smith M, Brown S, Dupree R. 27Al double rotation two-dimensional spin diffusion NMR: Complete unambiguous assignment of aluminium sites in 9Al2O3·2B2O3. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.10.085] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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43
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Wong A, Howes AP, Pike KJ, Lemaître V, Watts A, Anupõld T, Past J, Samoson A, Dupree R, Smith ME. New Limits for Solid-State 17O NMR Spectroscopy: Complete Resolution of Multiple Oxygen Sites in a Simple Biomolecule. J Am Chem Soc 2006; 128:7744-5. [PMID: 16771481 DOI: 10.1021/ja062031l] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A solid-state 17O NMR 1H-decoupled double angle rotation (DOR) study of monosodium l-glutamate monohydrate (l-MSG) is reported. It is shown that all eight inequivalent sites can be resolved with DOR line widths ( approximately 65 Hz) approximately 120 times narrower than those in the MAS spectrum. The lines are tentatively assigned on the basis of their behavior under proton decoupling and the isotropic chemical shift and the quadrupole interaction parameter for each extracted by a combination of DOR and 3Q MAS at variable magnetic fields. With a shift range of approximately 45 ppm for these similar oxygen sites and spectral resolution under DOR comparable to that for spin-1/2 nuclei, solid-state 17O NMR should have tremendous potential in the study of biomolecules.
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Affiliation(s)
- Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
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44
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Howes A, Anupõld T, Lemaitre V, Kukol A, Watts A, Samoson A, Smith M, Dupree R. Enhancing resolution and sensitivity of 17O solid-state NMR through combining double rotation, 1H decoupling and satellite modulation for biomolecular applications. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.01.061] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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45
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Kentgens APM, van Eck ERH, Ajithkumar TG, Anupõld T, Past J, Reinhold A, Samoson A. New opportunities for double rotation NMR of half-integer quadrupolar nuclei. J Magn Reson 2006; 178:212-9. [PMID: 16249109 DOI: 10.1016/j.jmr.2005.09.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2005] [Revised: 09/30/2005] [Accepted: 09/30/2005] [Indexed: 05/05/2023]
Abstract
A combined approach is presented which expands the applicability of double rotation (DOR) by overcoming its most prominent disadvantages: spinning stability and sensitivity. A new design using air-bearings for the inner rotor and a computer-assisted start-up procedure allows DOR operation over in principle unlimited time at outer rotor speeds of up to 2000Hz. Sensitivity enhancement of the DOR experiment is achieved by applying amplitude-modulated adiabatic pulses such as the double frequency sweep (DFS) before pulse excitation. Repeating the DFS enhancement and signal readout several times without allowing for spin-lattice relaxation leads to sensitivity enhancements of a factor 3 for (27)Al in various minerals. As a result, it becomes possible to study low sensitivity quadrupolar nuclei and various long duration 2D measurements can be performed routinely. Spinning is adequate to suppress residual homonuclear dipolar couplings in the spectral dimension of typical quadrupolar spin systems. In 2D-exchange spectroscopy, however, homonuclear correlation can still be established through dipolar-quadrupolar cross-terms.
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Affiliation(s)
- Arno P M Kentgens
- Department of Physical Chemistry/Solid-State NMR, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, The Netherlands.
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46
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Wong A, Pike KJ, Jenkins R, Clarkson GJ, Anupõld T, Howes AP, Crout DHG, Samoson A, Dupree R, Smith ME. Experimental and Theoretical 17O NMR Study of the Influence of Hydrogen-Bonding on CO and O−H Oxygens in Carboxylic Solids. J Phys Chem A 2006; 110:1824-35. [PMID: 16451014 DOI: 10.1021/jp055807y] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A systematic solid-state 17O NMR study of a series of carboxylic compounds, maleic acid, chloromaleic acid, KH maleate, KH chloromaleate, K2 chloromaleate, and LiH phthalate.MeOH, is reported. Magic-angle spinning (MAS), triple-quantum (3Q) MAS, and double angle rotation (DOR) 17O NMR spectra were recorded at high magnetic fields (14.1 and 18.8 T). 17O MAS NMR for metal-free carboxylic acids and metal-containing carboxylic salts show featured spectra and demonstrate that this combined, where necessary, with DOR and 3QMAS, can yield site-specific information for samples containing multiple oxygen sites. In addition to 17O NMR spectroscopy, extensive quantum mechanical calculations were carried out to explore the influence of hydrogen bonding at these oxygen sites. B3LYP/6-311G++(d,p) calculations of 17O NMR parameters yielded good agreement with the experimental values. Linear correlations are observed between the calculated 17O NMR parameters and the hydrogen bond strengths, suggesting the possibility of estimating H-bonding information from 17O NMR data. The calculations also revealed intermolecular H-bond effects on the 17O NMR shielding tensors. It is found that the delta11 and delta22 components of the chemical shift tensor at O-H and C=O, respectively, are aligned nearly parallel with the strong H-bond and shift away from this direction as the H-bond interaction weakens.
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Affiliation(s)
- Alan Wong
- Department of Physics, University of Warwick, Coventry, CV4 7AL, U. K
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47
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Ernst M, Samoson A, Meier BH. Decoupling and recoupling using continuous-wave irradiation in magic-angle-spinning solid-state NMR: A unified description using bimodal Floquet theory. J Chem Phys 2005; 123:64102. [PMID: 16122295 DOI: 10.1063/1.1944291] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The application of two or more different time-dependent coherent perturbations with, in general, incommensurable frequencies occurs quite commonly in NMR experiments. Here we develop a unified description of the entire class of experiments using bimodal Floquet theory and van Vleck-Primas perturbation theory. This treatment leads to a time-independent effective Hamiltonian in Hilbert space and can be looked at as a generalization of average Hamiltonian theory to several incommensurate time dependencies. As a prototype experiment we treat the application of continuous-wave (cw) radio-frequency irradiation in combination with magic-angle sample spinning. Practically relevant examples of this type of experiments are heteronuclear spin decoupling and recoupling experiments using cw irradiation, e.g., rotary-resonance recoupling. Perturbations up to the third order must be taken into account to explain all experimentally observed resonance conditions.
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Affiliation(s)
- Matthias Ernst
- Physical Chemistry, Eidgenössische Technische Hochschule (ETH) Zurich, CH-8093 Zürich, Switzerland.
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48
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Readman JE, Grey CP, Ziliox M, Bull LM, Samoson A. Comparison of the (17)O NMR spectra of zeolites LTA and LSX. Solid State Nucl Magn Reson 2004; 26:153-159. [PMID: 15388179 DOI: 10.1016/j.ssnmr.2004.03.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2004] [Revised: 03/23/2004] [Indexed: 05/24/2023]
Abstract
17O NMR studies of various cation-exchanged LTA and LSX zeolites have shown similarities between the two systems. LSX samples containing divalent cations contain resonances with similar chemical shifts to those previously assigned to 'bare' framework oxygen atoms in Ca-LTA and Sr-LTA. The assignments are consistent with the trends seen in the spectra of monovalent cation-containing LSX and LTA zeolites, which show an increase in the average chemical shift with increasing cationic radius. The spectrum of Li-LSX, like Na-LSX, can be assigned based on the T-O-T bond angles. Gas sorption studies on Li-LSX are used to help identify the framework oxygen atoms that form the beta-cages and demonstrate the sensitivity of the (17)O shifts to gas loading.
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Affiliation(s)
- Jennifer E Readman
- Department of Chemistry, State University of New York at Stony Brook, Stony Book, NY 11794-3400, USA
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49
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Affiliation(s)
- K. J. Pike
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - V. Lemaitre
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - A. Kukol
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - T. Anupõld
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - A. Samoson
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - A. P. Howes
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - A. Watts
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - M. E. Smith
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
| | - R. Dupree
- Departments of Physics and Biological Sciences, University of Warwick, Coventry CV4 7AL, U.K., Biosciences Department, Nestlé Research Centre, Vers-chez-les-Blancs, P.O. Box 44, CH-1000 Lausanne 26, Switzerland, Biochemistry Department, University of Oxford, South Parks Road, Oxford OX1 3QU, U.K., and National Institute for Chemical Physics and Biophysics, Akadeemia Tee 23, Tallinn, Estonia
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Abstract
We demonstrate that two-dimensional solid-state NMR chemical-shift correlation spectra can be recorded under low-power conditions. Except for the cross-polarization period, no rf-field amplitudes above 40 kHz are used. Such experiments require the use of fast (>50 kHz) magic-angle spinning (MAS). A comparison with the high-power version of the experiment shows no general line broadening but some changes in the polarization-transfer dynamics.
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Affiliation(s)
- Matthias Ernst
- Physical Chemistry, ETH-Zürich, CH-8093 Zürich, Switzerland
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