1
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Callon M, Malär AA, Pfister S, Římal V, Weber ME, Wiegand T, Zehnder J, Chávez M, Cadalbert R, Deb R, Däpp A, Fogeron ML, Hunkeler A, Lecoq L, Torosyan A, Zyla D, Glockshuber R, Jonas S, Nassal M, Ernst M, Böckmann A, Meier BH. Biomolecular solid-state NMR spectroscopy at 1200 MHz: the gain in resolution. J Biomol NMR 2021; 75:255-272. [PMID: 34170475 PMCID: PMC8275511 DOI: 10.1007/s10858-021-00373-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [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: 04/03/2021] [Accepted: 06/11/2021] [Indexed: 05/12/2023]
Abstract
Progress in NMR in general and in biomolecular applications in particular is driven by increasing magnetic-field strengths leading to improved resolution and sensitivity of the NMR spectra. Recently, persistent superconducting magnets at a magnetic field strength (magnetic induction) of 28.2 T corresponding to 1200 MHz proton resonance frequency became commercially available. We present here a collection of high-field NMR spectra of a variety of proteins, including molecular machines, membrane proteins, viral capsids, fibrils and large molecular assemblies. We show this large panel in order to provide an overview over a range of representative systems under study, rather than a single best performing model system. We discuss both carbon-13 and proton-detected experiments, and show that in 13C spectra substantially higher numbers of peaks can be resolved compared to 850 MHz while for 1H spectra the most impressive increase in resolution is observed for aliphatic side-chain resonances.
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Affiliation(s)
- Morgane Callon
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | | | - Sara Pfister
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Václav Římal
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Marco E Weber
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Thomas Wiegand
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | | | - Matías Chávez
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | | | - Rajdeep Deb
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Alexander Däpp
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Marie-Laure Fogeron
- Molecular Microbiology and Structural Biochemistry, UMR 5086 CNRS, Université de Lyon, 69367, Lyon, France
| | | | - Lauriane Lecoq
- Molecular Microbiology and Structural Biochemistry, UMR 5086 CNRS, Université de Lyon, 69367, Lyon, France
| | | | - Dawid Zyla
- Institute of Molecular Biology and Biophysics, ETH Zurich, 8093, Zurich, Switzerland
| | - Rudolf Glockshuber
- Institute of Molecular Biology and Biophysics, ETH Zurich, 8093, Zurich, Switzerland
| | - Stefanie Jonas
- Institute of Molecular Biology and Biophysics, ETH Zurich, 8093, Zurich, Switzerland
| | - Michael Nassal
- Department of Medicine II / Molecular Biology, University of Freiburg, Freiburg im Breisgau, Germany
| | - Matthias Ernst
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland.
| | - Anja Böckmann
- Molecular Microbiology and Structural Biochemistry, UMR 5086 CNRS, Université de Lyon, 69367, Lyon, France.
| | - Beat H Meier
- Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland.
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2
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Jähnig F, Himmler A, Kwiatkowski G, Däpp A, Hunkeler A, Kozerke S, Ernst M. A spin-thermodynamic approach to characterize spin dynamics in TEMPO-based samples for dissolution DNP at 7 T field. J Magn Reson 2019; 303:91-104. [PMID: 31030064 DOI: 10.1016/j.jmr.2019.04.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 04/12/2019] [Accepted: 04/19/2019] [Indexed: 06/09/2023]
Abstract
The spin dynamics of dissolution DNP samples consisting of 4.5 M [13C]urea in a mixture of (1/1)Vol glycerol/water using 4-Oxo-TEMPO as a radical was investigated. We analyzed the DNP dynamics as function of radical concentration at 7 T and 3.4 T static magnetic field as well as function of deuteration of the solvent matrix at the high field. The spin dynamics could be reproduced in all cases, at least qualitatively, by a thermodynamic model based on spin temperatures of the nuclear Zeeman baths and an electron non-Zeeman (dipolar) bath. We find, however, that at high field (7 T) and low radical concentrations (25 mM) the nuclear spins do not reach the same spin temperature indicating a weak coupling of the two baths. At higher radical concentrations, as well as for all radical concentrations at low field (3.4 T), the two nuclear Zeeman baths reach the same spin temperature within experimental errors. Additionally, the spin system was prepared with different initial conditions. For these cases, the thermodynamic model was able to predict the time evolution of the system well. While the DNP profiles do not give clear indications to a specific polarization transfer mechanism, at high field (7 T) increased coupling is seen. The EPR line shapes cannot clarify this in absence of ELDOR type experiments, nevertheless DNP profiles and dynamics under frequency-modulated microwave irradiation illustrate the expected increase in coupling between electrons with increasing radical concentration.
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Affiliation(s)
- Fabian Jähnig
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Aaron Himmler
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Grzegorz Kwiatkowski
- Institute for Biomedical Engineering, University and ETH Zürich, Gloriastrasse 35, 8092 Zürich, Switzerland
| | - Alexander Däpp
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Sebastian Kozerke
- Institute for Biomedical Engineering, University and ETH Zürich, Gloriastrasse 35, 8092 Zürich, Switzerland
| | - Matthias Ernst
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland.
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3
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Schnoz S, Hunkeler A, Däpp A, Kamberger R, Korvink JG, Meier BH. Microscale 3D imaging by magnetic resonance force microscopy using full-volume Fourier- and Hadamard-encoding. J Magn Reson 2019; 299:196-201. [PMID: 30677601 DOI: 10.1016/j.jmr.2019.01.005] [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: 10/23/2018] [Revised: 01/09/2019] [Accepted: 01/10/2019] [Indexed: 06/09/2023]
Abstract
Three-dimensional spatially resolved full-volume imaging by magnetic resonance force microscopy at room temperature is described. Spatial resolution in z-dimension is achieved by using the magnetic-field gradient of a ferromagnetic particle that is also used for the force detection of the magnetic resonance. The gradient of the radiofrequency pulses generated by two separate wire-bonded microcoils is used for spatial resolution in x- and y-dimension. To enhance the sensitivity of our measurement Hadamard- and Fourier-encoding schemes are applied due to their multiplex effect. Measurements were taken on a patterned (NH4)2SO4 crystal sample. From the calculated magnetic field distributions, a 3D image was reconstructed with a voxel volume of about 5 μm3 (1.2 μm × 3.0 μm × 1.4 μm in x-, y- and z-dimension).
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Affiliation(s)
- Sebastian Schnoz
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Alexander Däpp
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
| | - Robert Kamberger
- BrainLinks-BrainTools Cluster of Excellence, University of Freiburg, Georges-Koehler-Allee 80, 79110 Freiburg, Germany
| | - Jan G Korvink
- Institute of Microstructure Technology, KIT, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Beat H Meier
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
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4
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Schnoz S, Däpp A, Hunkeler A, Meier BH. Detection of liquids by magnetic resonance force microscopy in the gradient-on-cantilever geometry. J Magn Reson 2019; 298:85-90. [PMID: 30529895 DOI: 10.1016/j.jmr.2018.11.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 11/23/2018] [Accepted: 11/25/2018] [Indexed: 06/09/2023]
Abstract
We demonstrate the detection of picoliter amounts of water and triethylenetetramine by a magnetic-resonance-force-microscopy (MRFM) setup operated in the gradient-on-cantilever geometry at room temperature. A magnetic field gradient is produced by a ferromagnetic SmCo particle glued to the tip of a micromechanical resonator (cantilever). The liquids are enclosed in a micro-capillary to protect them from the high vacuum environment needed for sensitive detection. We describe simple spectroscopic experiments as proton T1 - relaxation, Rabi nutation curves and Hahn-echo measurements.
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Affiliation(s)
- Sebastian Schnoz
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Alexander Däpp
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland
| | - Beat H Meier
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland.
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5
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Wiegand T, Hunkeler A, Däpp A, Verasdonck J, Cadalbert R, Bousset L, Melki R, Böckmann A, Meier BH. CONFINE-MAS: a magic-angle spinning NMR probe that confines the sample in case of a rotor explosion. J Biomol NMR 2018; 72:171-177. [PMID: 30536187 DOI: 10.1007/s10858-018-0218-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 09/05/2018] [Accepted: 12/04/2018] [Indexed: 06/09/2023]
Abstract
Magic-angle spinning (MAS) is mandatory in solid-state NMR experiments to achieve resolved spectra. In rare cases, instabilities in the rotation or damage of either the rotor or the rotor cap can lead to a so called "rotor crash" involving a disintegration of the sample container and possibly the release of an aerosol or of dust. We present a modified design of a 3.2 mm probe with a confining chamber which in case of a rotor crash prevents the release of aerosols and possibly hazardous materials. 1D and 2D NMR experiments show that such a hazardous material-confining MAS probe ("CONFINE-MAS" probe) has a similar sensitivity compared to a standard probe and performs equally well in terms of spinning stability. We illustrate the CONFINE-MAS probe properties and performance by application to a fungal amyloid.
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Affiliation(s)
- Thomas Wiegand
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Alexander Däpp
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Joeri Verasdonck
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Riccardo Cadalbert
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Luc Bousset
- Institut François Jacob, MIRCen, CEA, Laboratory of Neurodegenerative Diseases, CNRS, 18 Rue du Panorama, 92265, Fontenay-aux-Roses, France
| | - Ronald Melki
- Institut François Jacob, MIRCen, CEA, Laboratory of Neurodegenerative Diseases, CNRS, 18 Rue du Panorama, 92265, Fontenay-aux-Roses, France.
| | - Anja Böckmann
- Molecular Microbiology and Structural Biochemistry, UMR 5086 CNRS, Université de Lyon, Labex Ecofect, 69367, Lyon, France.
| | - Beat H Meier
- Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland.
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6
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Bauer T, Dotta C, Balacescu L, Gath J, Hunkeler A, Böckmann A, Meier BH. Line-Broadening in Low-Temperature Solid-State NMR Spectra of Fibrils. J Biomol NMR 2017; 67:51-61. [PMID: 28161758 DOI: 10.1007/s10858-016-0083-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [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: 10/05/2016] [Accepted: 12/15/2016] [Indexed: 06/06/2023]
Abstract
The temperature-dependent resonance-line broadening of HET-s(218-289) in its amyloid form is investigated in the range between 110 K and 280 K. Significant differences are observed between residues in the structured hydrophobic triangular core, which are broadened the least and can be detected down to 100 K, and in the solvent-exposed parts, which are broadened the most and often disappear from the observed spectrum around 200 K. Below the freezing of the bulk water, around 273 K, the protein fibrils are still surrounded by a layer of mobile water whose thickness decreases with temperature, leading to drying out of the fibrils.
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Affiliation(s)
- Thomas Bauer
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093, Zurich, Switzerland
| | - Claudio Dotta
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093, Zurich, Switzerland
| | - Livia Balacescu
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093, Zurich, Switzerland
| | - Julia Gath
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093, Zurich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093, Zurich, Switzerland
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines, UMR 5086 CNRS, Université de Lyon 1, 7 passage du Vercors, 69367, Lyon, France.
| | - Beat H Meier
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093, Zurich, Switzerland.
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7
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Bauer T, Gath J, Hunkeler A, Ernst M, Böckmann A, Meier BH. Hexagonal ice in pure water and biological NMR samples. J Biomol NMR 2017; 67:15-22. [PMID: 28028745 DOI: 10.1007/s10858-016-0080-7] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 12/07/2016] [Indexed: 06/06/2023]
Abstract
Ice, in addition to "liquid" water and protein, is an important component of protein samples for NMR spectroscopy at subfreezing temperatures but it has rarely been observed spectroscopically in this context. We characterize its spectroscopic behavior in the temperature range from 100 to 273 K, and find that it behaves like pure water ice. The interference of magic-angle spinning (MAS) as well as rf multiple-pulse sequences with Bjerrum-defect motion greatly influences the ice spectra.
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Affiliation(s)
- Thomas Bauer
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Julia Gath
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Andreas Hunkeler
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Matthias Ernst
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland.
| | - Anja Böckmann
- Institut de Biologie et Chimie des Protéines, UMR 5086 CNRS, Université de Lyon 1, 7 passage du Vercors, 69367, Lyon, France.
| | - Beat H Meier
- Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland.
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Jähnig F, Kwiatkowski G, Däpp A, Hunkeler A, Meier BH, Kozerke S, Ernst M. Dissolution DNP using trityl radicals at 7 T field. Phys Chem Chem Phys 2017; 19:19196-19204. [DOI: 10.1039/c7cp03633g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Characterization of direct 13C DNP at 1.4 K and 7 T field using trityl radicals.
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Affiliation(s)
- Fabian Jähnig
- Physical Chemistry
- ETH Zürich
- Vladimir-Prelog-Weg 2
- 8093 Zürich
- Switzerland
| | - Grzegorz Kwiatkowski
- Institute for Biomedical Engineering
- University and ETH Zürich
- Gloriastrasse 35
- 8092 Zürich
- Switzerland
| | - Alexander Däpp
- Physical Chemistry
- ETH Zürich
- Vladimir-Prelog-Weg 2
- 8093 Zürich
- Switzerland
| | - Andreas Hunkeler
- Physical Chemistry
- ETH Zürich
- Vladimir-Prelog-Weg 2
- 8093 Zürich
- Switzerland
| | - Beat H. Meier
- Physical Chemistry
- ETH Zürich
- Vladimir-Prelog-Weg 2
- 8093 Zürich
- Switzerland
| | - Sebastian Kozerke
- Institute for Biomedical Engineering
- University and ETH Zürich
- Gloriastrasse 35
- 8092 Zürich
- Switzerland
| | - Matthias Ernst
- Physical Chemistry
- ETH Zürich
- Vladimir-Prelog-Weg 2
- 8093 Zürich
- Switzerland
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9
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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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Batel M, Däpp A, Hunkeler A, Meier BH, Kozerke S, Ernst M. Cross-polarization for dissolution dynamic nuclear polarization. Phys Chem Chem Phys 2014; 16:21407-16. [DOI: 10.1039/c4cp02696a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [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
Investigation of DNP CP using a spin-thermodynamic model and optimization of CP in power-limited DNP probes using adiabatic RF pulses.
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Affiliation(s)
- Michael Batel
- Physical Chemistry
- ETH Zürich
- 8093 Zürich, Switzerland
| | | | | | - Beat H. Meier
- Physical Chemistry
- ETH Zürich
- 8093 Zürich, Switzerland
| | - Sebastian Kozerke
- Institute for Biomedical Engineering
- University and ETH Zürich
- 8092 Zürich, Switzerland
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11
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Gardiennet C, Schütz AK, Hunkeler A, Kunert B, Terradot L, Böckmann A, Meier BH. Hochaufgelöste Festkörper-NMR-Spektren einer sedimentierten, nichtkristallinen dodekameren Helicase (59 kDa). Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200779] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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12
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Gardiennet C, Schütz AK, Hunkeler A, Kunert B, Terradot L, Böckmann A, Meier BH. A Sedimented Sample of a 59 kDa Dodecameric Helicase Yields High-Resolution Solid-State NMR Spectra. Angew Chem Int Ed Engl 2012; 51:7855-8. [DOI: 10.1002/anie.201200779] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Revised: 04/10/2012] [Indexed: 11/10/2022]
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13
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Batel M, Krajewski M, Weiss K, With O, Däpp A, Hunkeler A, Gimersky M, Pruessmann KP, Boesiger P, Meier BH, Kozerke S, Ernst M. A multi-sample 94 GHz dissolution dynamic-nuclear-polarization system. J Magn Reson 2012; 214:166-174. [PMID: 22142831 DOI: 10.1016/j.jmr.2011.11.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Revised: 11/04/2011] [Accepted: 11/05/2011] [Indexed: 05/31/2023]
Abstract
We describe the design and initial performance results of a multi-sample dissolution dynamic-nuclear-polarization (DNP) polarizer based on a Helium-temperature NMR cryostat for use in a wide-bore NMR magnet with a room-temperature bore. The system is designed to accommodate up to six samples in a revolver-style sample changer that allows changing samples at liquid-Helium temperature and at pressures ranging from ambient pressure down to 1 mbar. The multi-sample setup is motivated by the desire to do repetitive in vivo measurements and to characterize the DNP process by investigating samples of different chemical composition. The system can be loaded with up to six samples simultaneously to reduce sample loading and unloading. Therefore, series of experiments can be carried out faster and more reliably. The DNP probe contains an oversized microwave cavity and includes EPR and NMR capabilities for monitoring the DNP process. In the solid state, DNP enhancements corresponding to ∼45% polarization for [1-(13)C]pyruvic acid with a trityl radical have been measured. In the initial liquid-state acquisition experiments described here, the polarization was found to be ∼13%, corresponding to an enhancement factor exceeding 16,000 relative to thermal polarization at 9.4 T and ambient temperature.
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Affiliation(s)
- Michael Batel
- Physical Chemistry, ETH Zürich, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
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14
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Böckmann A, Gardiennet C, Verel R, Hunkeler A, Loquet A, Pintacuda G, Emsley L, Meier BH, Lesage A. Characterization of different water pools in solid-state NMR protein samples. J Biomol NMR 2009; 45:319-27. [PMID: 19779834 DOI: 10.1007/s10858-009-9374-3] [Citation(s) in RCA: 199] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Accepted: 09/04/2009] [Indexed: 05/09/2023]
Abstract
We observed and characterized two distinct signals originating from different pools of water protons in solid-state NMR protein samples, namely from crystal water which exchanges polarization with the protein (on the NMR timescale) and is located in the protein-rich fraction at the periphery of the magic-angle spinning (MAS) sample container, and supernatant water located close to the axis of the sample container. The polarization transfer between the water and the protein can be probed by two-dimensional exchange spectroscopy, and we show that the supernatant water does not interact with protein on the timescale of the experiments. The two water pools have different spectroscopic properties, including resonance frequency, longitudinal, transverse and rotating frame relaxation times. The supernatant water can be removed almost completely physically or can be frozen selectively. Both measures lead to an enhancement of the quality factor of the probe circuit, accompanied by an improvement of the experimental signal/noise, and greatly simplify solvent-suppression by substantially reducing the water signal. We also present a tool, which allows filling solid-state NMR sample containers in a more efficient manner, greatly reducing the amount of supernatant water and maximizing signal/noise.
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Affiliation(s)
- Anja Böckmann
- Institut de Biologie et Chimie des Protéines, Université de Lyon, UMR 5086 CNRS/UCB-Lyon 1, 7 passage du Vercors, 69367 Lyon, France.
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Eberhardt K, Degen C, Hunkeler A, Meier B. One- and Two-Dimensional NMR Spectroscopy with a Magnetic-Resonance Force Microscope. Angew Chem Int Ed Engl 2008; 47:8961-3. [DOI: 10.1002/anie.200802978] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Eberhardt K, Degen C, Hunkeler A, Meier B. Ein- und zweidimensionale NMR-Spektroskopie mittels Kernresonanzkraftmikroskopie. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200802978] [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: 11/11/2022]
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Lin Q, Degen CL, Tomaselli M, Hunkeler A, Meier U, Meier BH. Magnetic double resonance in force microscopy. Phys Rev Lett 2006; 96:137604. [PMID: 16712037 DOI: 10.1103/physrevlett.96.137604] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2005] [Indexed: 05/09/2023]
Abstract
Magnetic-resonance force microscopy is combined with cross-polarization and spin-decoupling NMR techniques to obtain double-resonance NMR signals of micrometer-scaled objects. The effective one-dimensional spatial resolution obtained in our experiments performed on a KPF6 single crystal sample is approximately 0.5 microm. The spectral linewidth of 900 Hz is sample limited. The described double-resonance techniques can introduce new chemical specificity to the magnetic-force sensor.
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Affiliation(s)
- Qiong Lin
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
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Degen CL, Lin Q, Hunkeler A, Meier U, Tomaselli M, Meier BH. Microscale localized spectroscopy with a magnetic resonance force microscope. Phys Rev Lett 2005; 94:207601. [PMID: 16090289 DOI: 10.1103/physrevlett.94.207601] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Indexed: 05/03/2023]
Abstract
Magnetic resonance force microscopy is combined with spin-echo spectroscopy to obtain spatially and spectrally resolved NMR signals of micrometer-scale objects. The experimental spatial resolution for the demonstration experiment on a sample consisting of Ba(ClO3)2.H2O and (NH4)2SO4 single crystals is 3.4 microm. The spectral resolution of 3.4 kHz is sample limited. Improvements in resolution and extensions of the method to more than one spatial dimension and to multidimensional spectroscopy are possible.
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Affiliation(s)
- C L Degen
- Physical Chemistry, ETH Zurich, CH-8093 Zurich, Switzerland
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Zandomeneghi G, Williamson PTF, Hunkeler A, Meier BH. Switched-angle spinning applied to bicelles containing phospholipid-associated peptides. J Biomol NMR 2003; 25:125-132. [PMID: 12652121 DOI: 10.1023/a:1022244025351] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In a model study, the proton NMR spectrum of the opioid pentapeptide leucine-enkephalin associated with bicelles is investigated. The spectral resolution for a static sample is limited due to the large number of anisotropic interactions, in particular strong proton-proton couplings, but resolution is greatly improved by magic-angle sample spinning. Here we present two-dimensional switched-angle spinning NMR experiments, which correlate the high-resolution spectrum of the membrane-bound peptide under magic-angle spinning with its anisotropic spectrum, leading to well-resolved spectra. The two-dimensional spectrum allows the exploitation of the high resolution of the isotropic spectrum, while retaining the structural information imparted by the anisotropic interactions in the static spectrum. Furthermore, switched-angle spinning techniques are demonstrated that allow one to record the proton spectrum of ordered bicellar phases as a function of the angle between the rotor axis and the magnetic field direction, thereby scaling the dipolar interactions by a predefined factor.
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