51
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Mollica G, Dekhil M, Ziarelli F, Thureau P, Viel S. Probing crystal packing of uniformly (13)C-enriched powder samples using homonuclear dipolar coupling measurements. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:114-121. [PMID: 25595367 DOI: 10.1016/j.ssnmr.2014.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Revised: 11/26/2014] [Accepted: 12/05/2014] [Indexed: 06/04/2023]
Abstract
The relationship between the crystal packing of powder samples and long-range (13)C-(13)C homonuclear dipolar couplings is presented and illustrated for the case of uniformly (13)C-enriched L-alanine and L-histidine·HCl·H2O. Dipolar coupling measurement is based on the partial reintroduction of dipolar interactions by spinning the sample slightly off-magic-angle, while the coupling of interest for a given spin pair is isolated with a frequency-selective pulse. A cost function is used to correlate the so-derived dipolar couplings to trial crystal structures of the samples under study. This procedure allowed for the investigation of the l-alanine space group and L-histidine·HCl·H2O space group and unit-cell parameters.
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Affiliation(s)
- Giulia Mollica
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Myriam Dekhil
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
| | - Fabio Ziarelli
- Aix-Marseille Université, Centrale Marseille, CNRS, Fédération des sciences chimiques de Marseille FR 1739, 13397 Marseille, France
| | - Pierre Thureau
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France.
| | - Stéphane Viel
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13397 Marseille, France
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52
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Skotnicki M, Aguilar JA, Pyda M, Hodgkinson P. Bisoprolol and bisoprolol-valsartan compatibility studied by differential scanning calorimetry, nuclear magnetic resonance and X-ray powder diffractometry. Pharm Res 2014; 32:414-29. [PMID: 25115829 PMCID: PMC4300422 DOI: 10.1007/s11095-014-1471-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Accepted: 07/24/2014] [Indexed: 11/29/2022]
Abstract
Purpose The objective of this study was to evaluate the thermal behavior of crystalline and amorphous bisoprolol fumarate and its compatibility with amorphous valsartan. This pharmacologically relevant drug combination is a potential candidate for fixed-dose combination formulation. Methods DSC and TMDSC were used to examine thermal behavior of bisoprolol fumarate. SSNMR and XRPD were applied to probe the solid state forms. The thermal behavior of physical mixtures with different concentrations of bisoprolol and valsartan were examined by DSC and TMDSC, and the observed interactions were investigated by XRPD, solution- and solid-state NMR. Results The phase transitions from thermal methods and solid-state NMR spectra of crystalline and amorphous bisoprolol fumarate are reported. Strong interactions between bisoprolol fumarate and valsartan were observed above 60 C, resulting in the formation of a new amorphous material. Solution- and solid-state NMR provided insight into the molecular nature of the incompatibility. Conclusions A combined analysis of thermal methods, solution- and solid-state NMR and XRPD experiments allowed the investigation of the conformational and dynamic properties of bisoprolol fumarate. Since bisoprolol fumarate and valsartan react to form a new amorphous product, formulation of a fixed-dose combination would require separate reservoirs for bisoprolol and valsartan to prevent interactions. Similar problems might be expected with other excipients or APIs containing carboxylic groups. Electronic supplementary material The online version of this article (doi:10.1007/s11095-014-1471-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Marcin Skotnicki
- Department of Pharmaceutical Technology, Poznań University of Medical Sciences, ul. Grunwaldzka 6, 60-780, Poznań, Poland
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53
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Ye YQ, Malon M, Martineau C, Taulelle F, Nishiyama Y. Rapid measurement of multidimensional 1H solid-state NMR spectra at ultra-fast MAS frequencies. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2014; 239:75-80. [PMID: 24424008 DOI: 10.1016/j.jmr.2013.12.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 12/07/2013] [Accepted: 12/19/2013] [Indexed: 06/03/2023]
Abstract
A novel method to realize rapid repetition of (1)H NMR experiments at ultra-fast MAS frequencies is demonstrated. The ultra-fast MAS at 110kHz slows the (1)H-(1)H spin diffusion, leading to variations of (1)H T1 relaxation times from atom to atom within a molecule. The different relaxation behavior is averaged by applying (1)H-(1)H recoupling during relaxation delay even at ultra-fast MAS, reducing the optimal relaxation delay to maximize the signal to noise ratio. The way to determine optimal relaxation delay for arbitrary relaxation curve is shown. The reduction of optimal relaxation delay by radio-frequency driven recoupling (RFDR) was demonstrated on powder samples of glycine and ethenzamide with one and multi-dimensional NMR measurements.
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Affiliation(s)
- Yue Qi Ye
- JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| | - Michal Malon
- JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan
| | - Charlotte Martineau
- Tectospin, Institut Lavoisier de Versailles, Université de Versailles, Saint-Quentin-en-Yvelines, 78035 Versailles Cedex, France
| | - Francis Taulelle
- Tectospin, Institut Lavoisier de Versailles, Université de Versailles, Saint-Quentin-en-Yvelines, 78035 Versailles Cedex, France
| | - Yusuke Nishiyama
- JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan.
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54
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Sinnige T, Daniëls M, Baldus M, Weingarth M. Proton clouds to measure long-range contacts between nonexchangeable side chain protons in solid-state NMR. J Am Chem Soc 2014; 136:4452-5. [PMID: 24467345 DOI: 10.1021/ja412870m] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We show that selective labeling of proteins with protonated amino acids embedded in a perdeuterated matrix, dubbed 'proton clouds', provides general access to long-range contacts between nonexchangeable side chain protons in proton-detected solid-state NMR, which is important to study protein tertiary structure. Proton-cloud labeling significantly improves spectral resolution by simultaneously reducing proton line width and spectral crowding despite a high local proton density in clouds. The approach is amenable to almost all canonical amino acids. Our method is demonstrated on ubiquitin and the β-barrel membrane protein BamA.
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Affiliation(s)
- Tessa Sinnige
- NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University , 3584 CH Utrecht, The Netherlands
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55
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Asami S, Reif B. Proton-detected solid-state NMR spectroscopy at aliphatic sites: application to crystalline systems. Acc Chem Res 2013; 46:2089-97. [PMID: 23745638 DOI: 10.1021/ar400063y] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
When applied to biomolecules, solid-state NMR suffers from low sensitivity and resolution. The major obstacle to applying proton detection in the solid state is the proton dipolar network, and deuteration can help avoid this problem. In the past, researchers had primarily focused on the investigation of exchangeable protons in these systems. In this Account, we review NMR spectroscopic strategies that allow researchers to observe aliphatic non-exchangeable proton resonances in proteins with high sensitivity and resolution. Our labeling scheme is based on u-[(2)H,(13)C]-glucose and 5-25% H2O (95-75% D2O) in the M9 bacterial growth medium, known as RAP (reduced adjoining protonation). We highlight spectroscopic approaches for obtaining resonance assignments, a prerequisite for any study of structure and dynamics of a protein by NMR spectroscopy. Because of the dilution of the proton spin system in the solid state, solution-state NMR (1)HCC(1)H type strategies cannot easily be transferred to these experiments. Instead, we needed to pursue ((1)H)CC(1)H, CC(1)H, (1)HCC or ((2)H)CC(1)H type experiments. In protonated samples, we obtained distance restraints for structure calculations from samples grown in bacteria in media containing [1,3]-(13)C-glycerol, [2]-(13)C-glycerol, or selectively enriched glucose to dilute the (13)C spin system. In RAP-labeled samples, we obtained a similar dilution effect by randomly introducing protons into an otherwise deuterated matrix. This isotopic labeling scheme allows us to measure the long-range contacts among aliphatic protons, which can then serve as restraints for the three-dimensional structure calculation of a protein. Due to the high gyromagnetic ratio of protons, longer range contacts are more easily accessible for these nuclei than for carbon nuclei in homologous experiments. Finally, the RAP labeling scheme allows access to dynamic parameters, such as longitudinal relaxation times T1, and order parameters S(2) for backbone and side chain carbon resonances. We expect that these measurements will open up new opportunities to obtain a more detailed description of protein backbone and side chain dynamics.
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Affiliation(s)
- Sam Asami
- Deutsches Forschungszentrum für Gesundheit und Umwelt (HMGU), Helmholtz-Zentrum München, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
| | - Bernd Reif
- Deutsches Forschungszentrum für Gesundheit und Umwelt (HMGU), Helmholtz-Zentrum München, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
- Munich Center for Integrated Protein Science (CIPSM) at Department of Chemie, Technische Universität München (TUM), Lichtenbergstr. 4, D-85747 Garching, Germany
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56
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Saalwächter K. Robust NMR Approaches for the Determination of Homonuclear Dipole-Dipole Coupling Constants in Studies of Solid Materials and Biomolecules. Chemphyschem 2013; 14:3000-14. [DOI: 10.1002/cphc.201300254] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Indexed: 11/07/2022]
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57
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Tatton AS, Pham TN, Vogt FG, Iuga D, Edwards AJ, Brown SP. Probing Hydrogen Bonding in Cocrystals and Amorphous Dispersions Using 14N–1H HMQC Solid-State NMR. Mol Pharm 2013; 10:999-1007. [DOI: 10.1021/mp300423r] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrew S. Tatton
- Department
of Physics, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Tran N. Pham
- GlaxoSmithKline plc, Product Development, Gunnels Wood Road, Stevenage
SG1 2NY, United Kingdom
| | - Frederick G. Vogt
- GlaxoSmithKline plc, Product Development, 709 Swedeland
Road, King of Prussia, Pennsylvania
19406, United States
| | - Dinu Iuga
- Department
of Physics, University of Warwick, Coventry
CV4 7AL, United Kingdom
| | - Andrew J. Edwards
- GlaxoSmithKline plc, Product Development, Gunnels Wood Road, Stevenage
SG1 2NY, United Kingdom
| | - Steven P. Brown
- Department
of Physics, University of Warwick, Coventry
CV4 7AL, United Kingdom
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58
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Celinski VR, Weber J, Schmedt Auf der Günne J. C-REDOR curves of extended spin systems. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2013; 49-50:12-22. [PMID: 23141477 DOI: 10.1016/j.ssnmr.2012.10.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2012] [Revised: 09/28/2012] [Accepted: 10/01/2012] [Indexed: 06/01/2023]
Abstract
The convergence of simulated C-REDOR curves of (infinitely) large spin systems is investigated with respect to the number of spins considered in the calculations. Taking a sufficiently large number of spins (>20,000 spins) into account enables the simulation of converged C-REDOR curves over the entire time period and not only the initial regime. The calculations are based on an existing approximation within first order average Hamiltonian theory (AHT), which assumes the absence of homonuclear dipole-dipole interactions. The C-REDOR experiment generates an average Hamiltonian close to the idealized AHT behavior even for multiple spin systems including multiple homonuclear dipole-dipole interactions which is shown from numerically exact calculations of the spin dynamics. Experimentally it is shown that calculations accurately predict the full, experimental C-REDOR curves of the multi-spin systems (31)P-(19)F in apatite, (31)P-(1)H in potassium trimetaphosphimate and (1)H-(31)P in potassium dihydrogen phosphate. We also present (13)C-(1)H and (15)N-(1)H data for the organic compounds glycine, l-alanine and l-histidine hydrochloride monohydrate which require consideration of molecular motion. Furthermore, we investigated the current limits of the method from systematic errors and we suggest a simple way to calculate errors for homogeneous and heterogeneous samples from experimental data.
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59
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Chierotti MR, Gobetto R. NMR crystallography: the use of dipolar interactions in polymorph and co-crystal investigation. CrystEngComm 2013. [DOI: 10.1039/c3ce41026a] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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60
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Braschi I, Paul G, Gatti G, Cossi M, Marchese L. Embedding monomers and dimers of sulfonamide antibiotics into high silica zeolite Y: an experimental and computational study of the tautomeric forms involved. RSC Adv 2013. [DOI: 10.1039/c3ra22290j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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61
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Lu X, Trébosc J, Lafon O, Amoureux JP. Measurement of the shortest hetero-nuclear distances in multiple-spin systems using constant-time correlation NMR methods. CrystEngComm 2013. [DOI: 10.1039/c3ce40557e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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62
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Tatton AS, Bradley JP, Iuga D, Brown SP. 14N–1H Heteronuclear Multiple-Quantum Correlation Magic-Angle Spinning NMR Spectroscopy of Organic Solids. ACTA ACUST UNITED AC 2012. [DOI: 10.1524/zpch.2012.0308] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
14N–1H heteronuclear multiple-quantum correlation (HMQC) solid-state magic-angle spinning (MAS) NMR spectra recorded at a 1H Larmor frequency of 850 MHz are presented for the dipeptide β-AspAla. A modified version of the pulse sequence presented by Gan et al. (Chem. Phys. Lett. 435 (2007) 163) that utilises rotary resonance recoupling (R3) at the n = 2 condition (ν
1 = 2ν
R
) is employed. Spectra recorded with a short recoupling period (under 200 μs) show two correlation peaks corresponding to the NH and NH3 moieties in the dipeptide. The quadrupolar product, P
Q = C
Q √ [1 + (η
Q
2/3)], is determined experimentally as 3.1 MHz (NH) and 1.0 MHz (NH3) by a comparison of the 14N and 15N isotropic chemical shifts which differ due to the isotropic second-order quadrupolar shift for the spin I = 1 14N nucleus. It is shown that the peak sensitivities increase markedly upon increasing the MAS frequency from 30 to 45 to 60 kHz due to a combination of the reduced residual dipolar broadening of the 1H resonances and a lengthening of the coherence lifetimes under R
3
recoupling. Increasing the recoupling period leads to the observation of additional peaks corresponding to longer range intra- and intermolecular NH proximities. Reasonable agreement is evident upon comparing the experimental build-up of correlation peak intensity to that observed for eight-spin density-matrix simulations.
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Affiliation(s)
- Andrew S. Tatton
- University of Warwick, Department of Physics, Coventry, CV4 7AL, Großbritannien
| | - Jonathan P. Bradley
- University of Warwick, Department of Physics, Coventry, CV4 7AL, Großbritannien
| | - Dinu Iuga
- University of Warwick, Department of Physics, Coventry, CV4 7AL, Großbritannien
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63
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Pourpoint F, Trébosc J, Gauvin RM, Wang Q, Lafon O, Deng F, Amoureux JP. Measurement of Aluminum-Carbon Distances Using S-RESPDOR NMR Experiments. Chemphyschem 2012; 13:3605-15. [DOI: 10.1002/cphc.201200490] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 07/20/2012] [Indexed: 11/11/2022]
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64
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Khitrin AK, Xu J, Ramamoorthy A. Coherent averaging in the frequency domain. J Chem Phys 2012; 136:214504. [PMID: 22697555 PMCID: PMC3377367 DOI: 10.1063/1.4723682] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 05/15/2012] [Indexed: 11/14/2022] Open
Abstract
Quantum-mechanical evolution of systems with periodic time-modulated Hamiltonians is often described by effective interactions. Such average Hamiltonians, calculated as few terms of an expansion in powers of the interaction, are sometimes difficult to relate to experimental observations. We propose a frequency-domain approach to this problem, which offers certain advantages and produces an approximate solution for the density matrix, better linked to measurable quantities. The formalism is suitable for calculating the intensities of narrowed spectral peaks. Fast magic-angle-spinning NMR spectra of solids are used to experimentally illustrate the method.
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Affiliation(s)
- A K Khitrin
- Department of Chemistry, Kent State University, Kent, Ohio 44240-0001, USA
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65
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Bradley JP, Pickard CJ, Burley JC, Martin DR, Hughes LP, Cosgrove SD, Brown SP. Probing Intermolecular Hydrogen Bonding in Sibenadet Hydrochloride Polymorphs by High-Resolution 1H Double-Quantum Solid-State NMR Spectroscopy. J Pharm Sci 2012; 101:1821-30. [DOI: 10.1002/jps.23078] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 01/09/2012] [Accepted: 01/20/2012] [Indexed: 01/18/2023]
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66
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Reif B. Ultra-high resolution in MAS solid-state NMR of perdeuterated proteins: implications for structure and dynamics. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 216:1-12. [PMID: 22280934 DOI: 10.1016/j.jmr.2011.12.017] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 12/20/2011] [Accepted: 12/22/2011] [Indexed: 05/14/2023]
Abstract
High resolution proton spectra are obtained in MAS solid-state NMR in case samples are prepared using perdeuterated protein and D(2)O in the recrystallization buffer. Deuteration reduces drastically (1)H, (1)H dipolar interactions and allows to obtain amide proton line widths on the order of 20 Hz. Similarly, high-resolution proton spectra of aliphatic groups can be obtained if specifically labeled precursors for biosynthesis of methyl containing side chains are used, or if limited amounts of H(2)O in the bacterial growth medium is employed. This review summarizes recent spectroscopic developments to access structure and dynamics of biomacromolecules in the solid-state, and shows a number of applications to amyloid fibrils and membrane proteins.
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Affiliation(s)
- Bernd Reif
- Munich Center for Integrated Protein Science (CIPSM), Department Chemie, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany.
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67
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Tatton AS, Frantsuzov I, Brown SP, Hodgkinson P. Unexpected effects of third-order cross-terms in heteronuclear spin systems under simultaneous radio-frequency irradiation and magic-angle spinning NMR. J Chem Phys 2012; 136:084503. [DOI: 10.1063/1.3684879] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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68
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Brown SP. Applications of high-resolution 1H solid-state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 41:1-27. [PMID: 22177472 DOI: 10.1016/j.ssnmr.2011.11.006] [Citation(s) in RCA: 182] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 11/15/2011] [Accepted: 11/16/2011] [Indexed: 05/25/2023]
Abstract
This article reviews the large increase in applications of high-resolution (1)H magic-angle spinning (MAS) solid-state NMR, in particular two-dimensional heteronuclear and homonuclear (double-quantum and spin-diffusion NOESY-like exchange) experiments, in the last five years. These applications benefit from faster MAS frequencies (up to 80 kHz), higher magnetic fields (up to 1 GHz) and pulse sequence developments (e.g., homonuclear decoupling sequences applicable under moderate and fast MAS). (1)H solid-state NMR techniques are shown to provide unique structural insight for a diverse range of systems including pharmaceuticals, self-assembled supramolecular structures and silica-based inorganic-organic materials, such as microporous and mesoporous materials and heterogeneous organometallic catalysts, for which single-crystal diffraction structures cannot be obtained. The power of NMR crystallography approaches that combine experiment with first-principles calculations of NMR parameters (notably using the GIPAW approach) are demonstrated, e.g., to yield quantitative insight into hydrogen-bonding and aromatic CH-π interactions, as well as to generate trial three-dimensional packing arrangements. It is shown how temperature-dependent changes in the (1)H chemical shift, linewidth and DQ-filtered signal intensity can be analysed to determine the thermodynamics and kinetics of molecular level processes, such as the making and breaking of hydrogen bonds, with particular application to proton-conducting materials. Other applications to polymers and biopolymers, inorganic compounds and bioinorganic systems, paramagnetic compounds and proteins are presented. The potential of new technological advances such as DNP methods and new microcoil designs is described.
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Affiliation(s)
- Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
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69
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Reif B. Deuterated peptides and proteins: structure and dynamics studies by MAS solid-state NMR. Methods Mol Biol 2012; 831:279-301. [PMID: 22167680 DOI: 10.1007/978-1-61779-480-3_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Perdeuteration and back substitution of exchangeable protons in microcrystalline proteins, in combination with recrystallization from D(2)O-containing buffers, significantly reduce (1)H, (1)H dipolar interactions. This way, amide proton line widths on the order of 20 Hz are obtained. Aliphatic protons are accessible either via specifically protonated precursors or by using low amounts of H(2)O in the bacterial growth medium. The labeling scheme enables characterization of structure and dynamics in the solid-state without dipolar truncation artifacts.
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Affiliation(s)
- Bernd Reif
- Munich Center for Integrated Protein Science (CIPSM) at Department Chemie, Technische Universität München, Garching, Germany.
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70
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Mollica G, Madhu PK, Ziarelli F, Thévand A, Thureau P, Viel S. Towards measurement of homonuclear dipolar couplings in 1H solid-state NMR: recoupling with a rotor-synchronized decoupling scheme. Phys Chem Chem Phys 2012; 14:4359-64. [DOI: 10.1039/c2cp23765b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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71
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Webber AL, Masiero S, Pieraccini S, Burley JC, Tatton AS, Iuga D, Pham TN, Spada GP, Brown SP. Identifying guanosine self assembly at natural isotopic abundance by high-resolution 1H and 13C solid-state NMR spectroscopy. J Am Chem Soc 2011; 133:19777-95. [PMID: 22034827 DOI: 10.1021/ja206516u] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By means of the (1)H chemical shifts and the proton-proton proximities as identified in (1)H double-quantum (DQ) combined rotation and multiple-pulse spectroscopy (CRAMPS) solid-state NMR correlation spectra, ribbon-like and quartet-like self-assembly can be identified for guanosine derivatives without isotopic labeling for which it was not possible to obtain single crystals suitable for diffraction. Specifically, characteristic spectral fingerprints are observed for dG(C10)(2) and dG(C3)(2) derivatives, for which quartet-like and ribbon-like self-assembly has been unambiguously identified by (15)N refocused INADEQUATE spectra in a previous study of (15)N-labeled derivatives (Pham, T. N.; et al. J. Am. Chem. Soc.2005, 127, 16018). The NH (1)H chemical shift is observed to be higher (13-15 ppm) for ribbon-like self-assembly as compared to 10-11 ppm for a quartet-like arrangement, corresponding to a change from NH···N to NH···O intermolecular hydrogen bonding. The order of the two NH(2)(1)H chemical shifts is also inverted, with the NH(2) proton closest in space to the NH proton having a higher or lower (1)H chemical shift than that of the other NH(2) proton for ribbon-like as opposed to quartet-like self-assembly. For the dG(C3)(2) derivative for which a single-crystal diffraction structure is available, the distinct resonances and DQ peaks are assigned by means of gauge-including projector-augmented wave (GIPAW) chemical shift calculations. In addition, (14)N-(1)H correlation spectra obtained at 850 MHz under fast (60 kHz) magic-angle spinning (MAS) confirm the assignment of the NH and NH(2) chemical shifts for the dG(C3)(2) derivative and allow longer range through-space N···H proximities to be identified, notably to the N7 nitrogens on the opposite hydrogen-bonding face.
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Affiliation(s)
- Amy L Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
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72
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Demers JP, Chevelkov V, Lange A. Progress in correlation spectroscopy at ultra-fast magic-angle spinning: basic building blocks and complex experiments for the study of protein structure and dynamics. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2011; 40:101-113. [PMID: 21880471 DOI: 10.1016/j.ssnmr.2011.07.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 07/21/2011] [Accepted: 07/22/2011] [Indexed: 05/31/2023]
Abstract
Recent progress in multi-dimensional solid-state NMR correlation spectroscopy at high static magnetic fields and ultra-fast magic-angle spinning is discussed. A focus of the review is on applications to protein resonance assignment and structure determination as well as on the characterization of protein dynamics in the solid state. First, the consequences of ultra-fast spinning on sensitivity and sample heating are considered. Recoupling and decoupling techniques at ultra-fast MAS are then presented, as well as more complex experiments assembled from these basic building blocks. Furthermore, we discuss new avenues in biomolecular solid-state NMR spectroscopy that become feasible in the ultra-fast spinning regime, such as sensitivity enhancement based on paramagnetic doping, and the prospect of direct proton detection.
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Affiliation(s)
- Jean-Philippe Demers
- Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
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73
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Su Y, Hong M. Conformational disorder of membrane peptides investigated from solid-state NMR line widths and line shapes. J Phys Chem B 2011; 115:10758-67. [PMID: 21806038 PMCID: PMC3222302 DOI: 10.1021/jp205002n] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A challenge in the application of solid-state NMR spectroscopy to membrane peptides and proteins is the relatively broad line widths compared to those for solution NMR spectra. To understand the linewidth contributions to membrane protein NMR spectra, we have measured the inhomogeneous and homogeneous line widths of several well-studied membrane peptides under immobilized conditions. (13)C T(2) relaxation times of uniformly (13)C-labeled residues show that the homogeneous line widths of the peptides are comparable to those of crystalline model compounds under identical (1)H decoupling and magic angle spinning conditions, indicating that the homogeneous line widths are determined by conformation-independent factors, including residual dipolar coupling, J-coupling, and intrinsic T(2) relaxation. However, the membrane peptides exhibit larger apparent line widths than the crystalline compounds, indicating conformational disorder. A cationic cell-penetrating peptide, the human immunodeficiency virus TAT, exhibits the largest apparent line widths, which are about five-fold larger than the homogeneous line widths, while the transmembrane helix of the influenza M2 peptide and the β-hairpin antimicrobial peptide PG-1 show moderately larger apparent line widths than the crystalline compounds. These results are consistent with the random coil nature of the TAT peptide, which contrasts with the intramolecularly hydrogen bonded M2 and PG-1. Cross peak line shapes of 2D double-quantum correlation spectra show that the conformational disorder can occur at the residue level and can result from three origins, lipid-peptide interaction, intrinsic conformational disorder encoded in the amino acid sequence, and side-chain rotameric averaging. A particularly important lipid-peptide interaction for cationic membrane peptides is guanidinium-phosphate ion pair interaction. Thus, NMR line widths and line shapes are useful for understanding the conformational disorder of membrane peptides and proteins.
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Affiliation(s)
- Yongchao Su
- Department of Chemistry, Iowa State University, Ames, IA 50011
| | - Mei Hong
- Department of Chemistry, Iowa State University, Ames, IA 50011
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74
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Srinivasan S, Magusin PCMM. Lightweight hydrogen-storage material Mg(0.65)Sc(0.35)D2 studied with 2H and 2H-{45Sc} MAS NMR exchange spectroscopy. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2011; 39:88-98. [PMID: 21549576 DOI: 10.1016/j.ssnmr.2011.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 04/12/2011] [Accepted: 04/18/2011] [Indexed: 05/30/2023]
Abstract
Using double-quantum (2)H MAS NMR with (45)Sc recoupling and Bloch-Siegert compensated (2)H-{(45)Sc} TRAPDOR we have identified the overlapping NMR signals of deuterium with and without scandium neighbors in Mg(0.65)Sc(0.35)D(2), a candidate lightweight material for hydrogen storage. At room temperature we also observe a third type of mobile deuterium. Deuterium mobility among the three NMR-distinct sites has been investigated by means of one-and two-dimensional exchange spectroscopy (Exsy). Complete deuterium exchange within 0.1s is observed, which indicates that the three NMR-distinct sites are close together in the crystal lattice. The weak temperature- and MAS-rate dependences observed in Exsy are indicative for a combination of chemical exchange and spin diffusion.
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Affiliation(s)
- S Srinivasan
- Inorganic Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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75
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Dumez JN, Emsley L. A master-equation approach to the description of proton-driven spin diffusion from crystal geometry using simulated zero-quantum lineshapes. Phys Chem Chem Phys 2011; 13:7363-70. [PMID: 21431110 DOI: 10.1039/c1cp00004g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Measurements of proton-driven carbon-13 spin diffusion (PDSD) by NMR spectroscopy are a central component of structural analyses of biomolecules in the solid-state. However, the quantitative link between experimental PDSD data and structural information is difficult to make. Here we observe that a master-equation approach can be used to model full PDSD dynamics accurately in polycrystalline (13)C-labelled L-histidine·HCl·H(2)O under magic-angle spinning. In the master-equation approach, PDSD rates and effective dipolar couplings are related by a function of the carbon-carbon zero-quantum lineshapes; we find that numerical simulations of the zero-quantum lineshapes are sufficiently accurate so as to allow the calculation of PDSD rates that are in good agreement with the measured rates, directly from crystal geometry and with no adjustable parameters. Finally, using carbon-carbon internuclear distances we illustrate the potential of the master-equation approach for structural studies. Generalisation of these results to proton-driven carbon-13 spin diffusion in more complex molecular systems is readily envisaged.
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Affiliation(s)
- Jean-Nicolas Dumez
- Université de Lyon (CNRS/ENS Lyon/UCB Lyon1), Centre de RMN à très hauts champs, 5 rue de la Doua, 69100 Villeurbanne, France
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76
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Barrow NS, Yates JR, Feller SA, Holland D, Ashbrook SE, Hodgkinson P, Brown SP. Towards homonuclear J solid-state NMR correlation experiments for half-integer quadrupolar nuclei: experimental and simulated 11B MAS spin-echo dephasing and calculated 2JBB coupling constants for lithium diborate. Phys Chem Chem Phys 2011; 13:5778-89. [DOI: 10.1039/c0cp02343d] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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77
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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78
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Dumez JN, Butler MC, Emsley L. Numerical simulation of free evolution in solid-state nuclear magnetic resonance using low-order correlations in Liouville space. J Chem Phys 2010; 133:224501. [DOI: 10.1063/1.3505455] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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79
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Nunes TG, Diogo HP, Pinto SS, Moura Ramos JJ. Molecular Dynamics of Amorphous Gentiobiose Studied by Solid-State NMR. J Phys Chem B 2010; 114:15976-84. [DOI: 10.1021/jp106371w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Teresa G. Nunes
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
| | - Hermínio P. Diogo
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
| | - Susana S. Pinto
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
| | - Joaquim J. Moura Ramos
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
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80
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Mao K, Pruski M. Directly and indirectly detected through-bond heteronuclear correlation solid-state NMR spectroscopy under fast MAS. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 201:165-174. [PMID: 19833538 DOI: 10.1016/j.jmr.2009.09.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Accepted: 09/03/2009] [Indexed: 05/28/2023]
Abstract
Two-dimensional through-bond (1)H{(13)C} solid-state NMR experiments utilizing fast magic angle spinning (MAS) and homonuclear multipulse (1)H decoupling are presented. Remarkable efficiency of polarization transfer can be achieved at MAS rates exceeding 40 kHz, which is instrumental in these measurements. Schemes utilizing direct and indirect detection of heteronuclei are compared in terms of resolution and sensitivity. A simple procedure for optimization of (1)H homonuclear decoupling sequences under these conditions is proposed. The capabilities of these techniques were confirmed on two naturally abundant solids, tripeptide N-formyl-L-methionyl-L-leucyl-L-phenylalanine (f-MLF-OH) and brown coal.
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Affiliation(s)
- Kanmi Mao
- Ames Laboratory, Iowa State University, Ames, IA 50011-3020, USA
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81
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Butler MC, Dumez JN, Emsley L. Dynamics of large nuclear-spin systems from low-order correlations in Liouville space. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.07.017] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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82
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Aluas M, Tripon C, Griffin JM, Filip X, Ladizhansky V, Griffin RG, Brown SP, Filip C. CHHC and (1)H-(1)H magnetization exchange: analysis by experimental solid-state NMR and 11-spin density-matrix simulations. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 199:173-87. [PMID: 19467890 PMCID: PMC2706310 DOI: 10.1016/j.jmr.2009.04.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Accepted: 04/20/2009] [Indexed: 05/03/2023]
Abstract
A protocol is presented for correcting the effect of non-specific cross-polarization in CHHC solid-state MAS NMR experiments, thus allowing the recovery of the (1)H-(1)H magnetization exchange functions from the mixing-time dependent buildup of experimental CHHC peak intensity. The presented protocol also incorporates a scaling procedure to take into account the effect of multiplicity of a CH(2) or CH(3) moiety. Experimental CHHC buildup curves are presented for l-tyrosine.HCl samples where either all or only one in 10 molecules are U-(13)C labeled. Good agreement between experiment and 11-spin SPINEVOLUTION simulation (including only isotropic (1)H chemical shifts) is demonstrated for the initial buildup (t(mix)<100micros) of CHHC peak intensity corresponding to an intramolecular close (2.5A) H-H proximity. Differences in the initial CHHC buildup are observed between the one in 10 dilute and 100% samples for cases where there is a close intermolecular H-H proximity in addition to a close intramolecular H-H proximity. For the dilute sample, CHHC cross-peak intensities tended to significantly lower values for long mixing times (500micros) as compared to the 100% sample. This difference is explained as being due to the dependence of the limiting total magnetization on the ratio N(obs)/N(tot) between the number of protons that are directly attached to a (13)C nucleus and hence contribute significantly to the observed (13)C CHHC NMR signal, and the total number of (1)H spins into the system. (1)H-(1)H magnetization exchange curves extracted from CHHC spectra for the 100% l-tyrosine.HCl sample exhibit a clear sensitivity to the root sum squared dipolar coupling, with fast buildup being observed for the shortest intramolecular distances (2.5A) and slower, yet observable buildup for the longer intermolecular distances (up to 5A).
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Affiliation(s)
- Mihaela Aluas
- Physics Department, Babes-Bolyai University, 400084 Cluj, Romania
| | - Carmen Tripon
- National Institute for R&D of Isotopic and Molecular Technologies, P.O. Box 700, 400293 Cluj, Romania
| | - John M. Griffin
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK
| | - Xenia Filip
- Physics Department, Babes-Bolyai University, 400084 Cluj, Romania
| | - Vladimir Ladizhansky
- Department of Physics, University of Guelph, 50 Stone Road East, Guelph, Ontario, Canada N1G 2W1
| | - Robert G. Griffin
- Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK
| | - Claudiu Filip
- National Institute for R&D of Isotopic and Molecular Technologies, P.O. Box 700, 400293 Cluj, Romania
- Corresponding Author, Fax.: ++40 264 420042, e-mail:
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83
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Bradley JP, Tripon C, Filip C, Brown SP. Determining relative proton-proton proximities from the build-up of two-dimensional correlation peaks in 1H double-quantum MAS NMR: insight from multi-spin density-matrix simulations. Phys Chem Chem Phys 2009; 11:6941-52. [PMID: 19652828 DOI: 10.1039/b906400a] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The build-up of intensity-as a function of the number, n(rcpl), of POST-C7 elements used for the excitation and reconversion of double-quantum (DQ) coherence (DQC)-is analysed for the fifteen distinct DQ correlation peaks that are observed experimentally for the eight separate (1)H resonances in a (1)H (500 MHz) DQ CRAMPS solid-state (12.5 kHz MAS) NMR spectrum of the dipeptide beta-AspAla (S. P. Brown, A. Lesage, B. Elena, and L. Emsley, J. Am. Chem. Soc., 2004, 126, 13230). The simulation in SPINEVOLUTION (M. Veshtort and R. G. Griffin, J. Magn. Reson., 2006, 178, 248) of t(1) ((1)H DQ evolution) FIDs for clusters of eight dipolar-coupled protons gives separate simulated (1)H DQ build-up curves for the CH(2)(a), CH(2)(b), CH(Asp), CH(Ala), NH and OH (1)H single-quantum (SQ) (1)H resonances. An analysis of both the simulated and experimental (1)H DQ build-up leads to the following general observations: (i) considering the build-up of (1)H DQ peaks at a particular SQ frequency, maximum intensity is observed for the DQC corresponding to the shortest H-H distance; (ii) for the maximum intensity (1)H DQ peak at a particular SQ frequency, the recoupling time for the observed maximum intensity depends on the corresponding H-H distance, e.g., maximum intensity for the CH(2)(a)-CH(2)(b) (H-H distance = 1.55 A) and OH-CH(Asp) (H-H distance = 2.49 A) DQ peaks is observed at n(rcpl) = 2 and 3, respectively; (iii) for DQ peaks involving a CH(2) proton at a non-CH(2) SQ frequency, there is much reduced intensity and a maximum intensity at a short recoupling time; (iv) for the other lower intensity (1)H DQ peaks at a particular SQ frequency, maximum intensity is observed for the same (or close to the same) recoupling time, but the relative intensity of the DQ peaks is a reliable indicator of the relative H-H distance-the ratio of the maximum intensities for the peaks at the CH(Ala) SQ frequency due to the two DQCs with the NH and OH protons are found to be approximately in the ratio of the squares of the corresponding dipolar coupling constants. While the simulated (1)H DQ build-up curves reproduce most of the features of the experimental curves, maximum intensity is often observed at a longer recoupling time in simulations. In this respect, simulations for two to eight spins show a trend towards a faster decay for an increasing number of considered spins. Finally, simulations show that increasing either the Larmor frequency (to 1 GHz) or the MAS frequency (to 125 kHz) does not lead to changes in the marked differences between the (1)H DQ build-up curves at the CH(Asp) SQ frequency for DQCs to the CH(2)(a) and OH protons that correspond to similar H-H distances (2.39 A and 2.49 A, respectively).
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84
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Brown SP. Recent Advances in Solid-State MAS NMR Methodology for Probing Structure and Dynamics in Polymeric and Supramolecular Systems. Macromol Rapid Commun 2009; 30:688-716. [DOI: 10.1002/marc.200800816] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Accepted: 02/06/2009] [Indexed: 01/12/2023]
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85
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Enhanced sensitivity in high-resolution 1H solid-state NMR spectroscopy with DUMBO dipolar decoupling under ultra-fast MAS. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2008.12.073] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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86
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Hung I, Uldry AC, Becker-Baldus J, Webber AL, Wong A, Smith ME, Joyce SA, Yates JR, Pickard CJ, Dupree R, Brown SP. Probing Heteronuclear 15N−17O and 13C−17O Connectivities and Proximities by Solid-State NMR Spectroscopy. J Am Chem Soc 2009; 131:1820-34. [DOI: 10.1021/ja805898d] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ivan Hung
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Anne-Christine Uldry
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Johanna Becker-Baldus
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Amy L. Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Mark E. Smith
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Siân A. Joyce
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Jonathan R. Yates
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Chris J. Pickard
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Ray Dupree
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
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87
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Lafon O, Wang Q, Hu B, Trébosc J, Deng F, Amoureux JP. Proton-proton homonuclear dipolar decoupling in solid-state NMR using rotor-synchronized z-rotation pulse sequences. J Chem Phys 2009; 130:014504. [DOI: 10.1063/1.3046479] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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88
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Zorin VE, Ernst M, Brown SP, Hodgkinson P. Insights into homonuclear decoupling from efficient numerical simulation: techniques and examples. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2008; 192:183-196. [PMID: 18321741 DOI: 10.1016/j.jmr.2008.02.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Revised: 02/12/2008] [Accepted: 02/13/2008] [Indexed: 05/26/2023]
Abstract
A combination of techniques, including rational number synchronisation and pre-diagonalisation of the time-dependent periodic Hamiltonian, are described which allow the efficient simulation of NMR experiments involving both magic-angle spinning (MAS) and RF irradiation, particularly in the important special case of phase-modulated decoupling sequences. Chebyshev and conventional diagonalisation approaches to calculating propagators under MAS are also compared, with Chebyshev methods offering significant advantages in cases where the Hamiltonian is large and time-dependent but not block-diagonal (as is the case for problems involving combined MAS and RF). The ability to simulate extended coupled spin systems efficiently allows 1H spectra under homonuclear decoupling to be calculated directly and compared to experimental results. Reasonable agreement is found for the conditions under which homonuclear decoupling is typically applied for rigid solids (although the increasing deviation of experimental results from the predictions of theory and simulation at higher RF powers is still unexplained). Numerical simulations are used to explore three features of these experiments: the interaction between the magic-angle spinning and RF decoupling, the effects of tilt pulses in acquisition windows and the effects of "phase propagation delays" on tilted axis precession. In each case, the results reveal features that are not readily anticipated by previous analytical studies and shed light on previous empirical observations.
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Affiliation(s)
- Vadim E Zorin
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, UK
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89
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Leskes M, Madhu PK, Vega S. Supercycled homonuclear dipolar decoupling in solid-state NMR: Toward cleaner H1 spectrum and higher spinning rates. J Chem Phys 2008; 128:052309. [DOI: 10.1063/1.2834730] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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90
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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. MAGNETIC RESONANCE IN CHEMISTRY : MRC 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] [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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Zorin VE, Elena B, Lesage A, Emsley L, Hodgkinson P. On the orientational dependence of resolution in 1H solid-state NMR, and its role in MAS, CRAMPS and delayed-acquisition experiments. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45 Suppl 1:S93-S100. [PMID: 18157810 DOI: 10.1002/mrc.2108] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Numerical simulations and experiments are used to show that the spin dynamics of the dipolar-coupled networks in solids is often strongly dependent on crystallite orientation. In particular, different rates of dephasing of the magnetisation mean that NMR signals obtained at longer dephasing times are dominated by orientations in which the local dipolar coupling strength is relatively weak. This often leads to a distinct improvement in spectral resolution as the dephasing time is increased. The effects are particularly noticeable under magic-angle spinning (MAS), but are also observed when homonuclear decoupling is used to reduce the rate of dipolar dephasing. Numerical simulation is seen to be a powerful and easily used tool for understanding the behaviour of solid-state NMR experiments involving dipolar-coupled networks. The implications for solid-state NMR spectra of abundant spins acquired under MAS and homonuclear decoupling are discussed, as well as insights provided into the performance of 'delayed-acquisition' and 'constant-time' experiments.
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Robbins AJ, Ng WTK, Jochym D, Keal TW, Clark SJ, Tozer DJ, Hodgkinson P. Combining insights from solid-state NMR and first principles calculation: applications to the 19F NMR of octafluoronaphthalene. Phys Chem Chem Phys 2007; 9:2389-96. [PMID: 17492102 DOI: 10.1039/b701291h] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Advances in solid-state NMR methodology and computational chemistry are applied to the (19)F NMR of solid octafluoronaphthalene. It is demonstrated experimentally, and confirmed by density functional theory (DFT) calculations, that the spectral resolution in the magic-angle spinning spectrum is limited by the anisotropy of the bulk magnetic susceptibility (ABMS). This leads to the unusual observation that the resolution improves as the sample is diluted. DFT calculations provide assignments of each of the peaks in the (19)F spectrum, but the predictions are close to the limits of accuracy and correlation information from 2-D NMR is invaluable in confirming the assignments. The effects of non-Gaussian lineshapes on the use of 2-D NMR for mapping correlations of spectral frequencies (e.g. due to the ABMS) are also discussed.
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Affiliation(s)
- Andrew J Robbins
- Department of Chemistry, University of Durham, South Road, Durham, UKDH1 3LE
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