Articles | Volume 3, issue 1
https://doi.org/10.5194/mr-3-15-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/mr-3-15-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Correction of field instabilities in biomolecular solid-state NMR by simultaneous acquisition of a frequency reference
Václav Římal
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Morgane Callon
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Alexander A. Malär
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Riccardo Cadalbert
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Anahit Torosyan
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Thomas Wiegand
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Matthias Ernst
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
Anja Böckmann
Molecular Microbiology and Structural Biochemistry, UMR 5086,
CNRS/Université de Lyon, 69367 Lyon, France
Physical Chemistry, ETH Zurich, Zurich, 8093, Switzerland
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Antonia Joëlle Bock, Matthias Ernst, and Götz Silvester Uhrig
Magn. Reson. Discuss., https://doi.org/10.5194/mr-2026-10, https://doi.org/10.5194/mr-2026-10, 2026
Preprint under review for MR
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The analysis of magic-angle spinning nuclear magnetic resonance experiments often includes determining a constant effective replacement for a periodic time-dependent Hamiltonian. We provide a clarifying overview over the two most used approaches, covering their mathematical origin, context, and relationship to each other, as well as their practical use for nuclear magnetic resonance applications. We recommend Floquet theory due to its numerical robustness, efficiency and accuracy.
Luzian Thomas and Matthias Ernst
Magn. Reson., 5, 153–166, https://doi.org/10.5194/mr-5-153-2024, https://doi.org/10.5194/mr-5-153-2024, 2024
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The paper investigates the suitability of an existing solution-state NMR spin decoupling sequence for use as a low-power solid-state NMR decoupling sequence under sample spinning. Complications arise from resonance conditions between the spin modulations by the pulse sequence and the sample rotation. We show that the timing of the pulse sequence is the most important criterion needed to achieve good decoupling. The paper gives recommendations for optimum parameters.
Louis Brigandat, Maëlys Laux, Caroline Marteau, Laura Cole, Anja Böckmann, Lauriane Lecoq, Marie-Laure Fogeron, and Morgane Callon
Magn. Reson., 5, 95–101, https://doi.org/10.5194/mr-5-95-2024, https://doi.org/10.5194/mr-5-95-2024, 2024
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We used NMR to sequentially assign the side-chain resonances of the cytosolic domain of glycoprotein n of the Crimean–Congo hemorrhagic fever virus. The combination of cell-free protein synthesis with high-field NMR and artificial intelligence approaches facilitated a time- and effort-efficient approach. Our results will be harnessed to study the membrane-bound form of the domain and its interactions with virulence factors, which will ultimately help to understand their role in disease.
Kathrin Aebischer, Lea Marie Becker, Paul Schanda, and Matthias Ernst
Magn. Reson., 5, 69–86, https://doi.org/10.5194/mr-5-69-2024, https://doi.org/10.5194/mr-5-69-2024, 2024
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To characterize the amplitude of dynamic processes in molecules, anisotropic parameters can be measured using solid-state NMR. However, the timescales of motion that lead to such a scaling of the anisotropic interactions are not clear. Using numerical simulations in small spin systems, we could show that mostly the magnitude of the anisotropic interaction determines the range of timescales detected by the scaled anisotropic interaction, and experimental parameters play a very minor role.
Aaron Himmler, Mohammed M. Albannay, Gevin von Witte, Sebastian Kozerke, and Matthias Ernst
Magn. Reson., 3, 203–209, https://doi.org/10.5194/mr-3-203-2022, https://doi.org/10.5194/mr-3-203-2022, 2022
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Dynamic nuclear polarization requires a waveguide that connects the cold (1–10 K) sample space to the outside. To reduce the heating of the sample, a waveguide is produced from steel which has low thermal conductivity but attenuates the microwaves. Therefore, the inside of the waveguide should be plated with silver to reduce electrical losses. We show a new simple way to electroplate such waveguides with a thin silver layer and show that this improves the experimental performance.
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Short summary
Through the advent of fast magic-angle spinning and high magnetic fields, the spectral resolution of solid-state NMR spectra has recently been greatly improved. To take full advantage of this gain, the magnetic field must be stable over the experiment time of hours or even days. We thus monitor the field by simultaneous acquisition of a frequency reference (SAFR) and use this information to correct multidimensional spectra improving resolution and availability of productive magnet time.
Through the advent of fast magic-angle spinning and high magnetic fields, the spectral...