Article
Chemistry, Physical
Debashis Majhi, Boris B. Kharkov, Sergey Dvinskikh
Summary: Dipolar NMR spectroscopy is a powerful analytical tool for studying structural and dynamic properties of solids at the molecular level. An approach to determine the signs of dipolar couplings in liquid crystals is presented, where sign information can be directly obtained from one-dimensional NMR spectra in samples spinning slightly off the magic angle. This method can be used to develop an experimental strategy for sign-sensitive measurements of heteronuclear dipolar couplings in anisotropic soft materials.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Yi Ji, Lixin Liang, Xinhe Bao, Guangjin Hou
Summary: With recent advancements in NMR hardware technology, fast MAS conditions have enabled efficient dipolar recoupling techniques for molecular structure and dynamics determination. The ratio of RF field strength to MAS frequency in different pulse sequences is crucial for determining the suitability of dipolar recoupling techniques under fast MAS conditions. Specially developed schemes for proton-detection NMR experiments under ultrafast MAS conditions have been highlighted as well.
SOLID STATE NUCLEAR MAGNETIC RESONANCE
(2021)
Article
Biochemistry & Molecular Biology
Marta Bonaccorsi, Tanguy Le Marchand, Guido Pintacuda
Summary: Magic-Angle Spinning Nuclear Magnetic Resonance (MAS NMR) is a rapidly developing technique that complements solution NMR, X-ray crystallography, and electron microscopy for the biophysical characterization of microcrystalline, poorly crystalline or disordered protein samples. MAS NMR is ideal for investigating both structures and dynamics, and has been increasingly applied in structural biology research in recent years to describe conformational dynamics in various systems.
CURRENT OPINION IN STRUCTURAL BIOLOGY
(2021)
Review
Chemistry, Physical
Bianca Chandler, Lauren Todd, Steven O. Smith
Summary: G protein-coupled receptors (GPCRs) are a class of transmembrane proteins with a simple structure that can recognize diverse chemical signals. There are over 800 GPCRs encoded in the human genome, serving as receptors for vision, smell, taste, and other physiological processes. While protein crystallography and electron cryo-microscopy have provided high-resolution structures of GPCRs, the structural changes induced by ligand or drug binding to stabilize active or inactive conformations are often subtle. NMR spectroscopy can provide insights into the local structure, dynamics, and activation pathways of GPCRs, capturing intermediate states and low-population conformations. Solid-state magic angle spinning NMR has been used to study the structure and activation mechanisms of GPCRs, particularly in the diverse class A family. This review highlights the application of solid-state and solution-state NMR spectroscopy in understanding the activation of different GPCR classes and subfamilies by their ligands and the modulation of GPCR activation by small molecule drugs. (c) 2021 Elsevier B.V. All rights reserved.
PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY
(2022)
Article
Biochemical Research Methods
Andrea Bertarello, Pierrick Berruyer, Urban Skantze, Samiksha Sardana, Malvika Sardana, Charles S. Elmore, Markus Schade, Elisabetta Chiarparin, Staffan Schantz, Lyndon Emsley
Summary: Dynamic nuclear polarization (DNP) significantly enhances the sensitivity of MAS NMR, but cross polarization (CP) is usually not quantitative. Research shows that absolute quantification in MAS DNP NMR is possible under DNP conditions, with errors below 10%.
JOURNAL OF MAGNETIC RESONANCE
(2021)
Article
Chemistry, Multidisciplinary
Nghia Tuan Duong, Daniel Lee, Frederic Mentink-Vigier, Olivier Lafon, Gael De Paepe
Summary: This study evaluates the performance of several homonuclear dipolar recoupling sequences for Al-27 nuclei and finds that BR2(2)(1) outperforms other sequences in terms of double-quantum transfer efficiency and bandwidth. The analytical approximation of BR2(2)(1) clarifies the interplay between radio-frequency offsets and double-quantum efficiency, providing insights for improving recoupling schemes for quadrupolar nuclei.
MAGNETIC RESONANCE IN CHEMISTRY
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Nian Wang, Qiuting Wen, Surendra Maharjan, Anthony J. Mirando, Yi Qi, Matthew J. Hilton, Charles E. Spritzer
Summary: This study evaluated the magic angle effect on DTI measurements in rat ligaments and mouse brains. The results showed that the DTI metrics in the ligament were strongly dependent on the collagen fiber orientation, while the dependence was less significant in mouse brains.
MAGNETIC RESONANCE IMAGING
(2022)
Article
Biochemical Research Methods
Daniel Banks, Brian Michael, Natalie Golota, Robert G. Griffin
Summary: This paper discusses the use of 3D printing and rapid prototyping methods to fabricate 3.2 mm stators and drive caps for NMR experiments. With the assistance of CAD software, these components can be produced at a fraction of the cost of commercial parts, while demonstrating comparable performance to commercially available systems.
JOURNAL OF MAGNETIC RESONANCE
(2022)
Article
Biochemical Research Methods
Lokeswara Rao Potnuru, Nghia Tuan Duong, Budaraju Sasank, Sreejith Raran-Kurussi, Yusuke Nishiyama, Vipin Agarwal
Summary: Proton-detected solid-state NMR at fast Magic Angle Spinning (MAS) is commonly used for structural characterization of molecules using dipolar couplings. Selective proton recoupling techniques have emerged for structural characterization through estimation of qualitative and quantitative distances. The study demonstrates that well-characterized CNnv sequences can be tailored for selective recoupling of proton spins. The C6(4)(1) recoupling sequence with a modified POST-element shows selective polarization transfer efficiencies between various proton spin pairs.
JOURNAL OF MAGNETIC RESONANCE
(2021)
Article
Biochemical Research Methods
Evgeny Nimerovsky, Stefan Becker, Loren B. Andreas
Summary: In this study, we investigate the windowed sequence for cross polarization (wCP) and find that it has additional matching conditions compared to traditional cross polarization. By considering the flip angle of the pulse, we observe a striking similarity between wCP and CP transfer conditions. Using spin-1/2 formalism and average Hamiltonian theory, we derive an analytical approximation that matches these observed transfer conditions. Data recorded at spectrometers with different external magnetic fields show that these transfers and the selectivity of CP are related to flip angle (average nutation).
JOURNAL OF MAGNETIC RESONANCE
(2023)
Article
Chemistry, Analytical
Alan Wong
Summary: High-Resolution Magic-Angle Spinning (HRMAS) NMR spectroscopy is considered an essential technique in metabolomics for assessing the biochemical composition of tissue samples. HRMAS localized profiling shows promise for spatial resolution of metabolic profiles within the sampling tissues.
ANALYTICAL METHODS
(2023)
Review
Chemistry, Physical
Kai Xue, Riddhiman Sarkar, Zdenek Tosner, Bernd Reif
Summary: Proton detection in solid state NMR is continuously advancing, and current achievements include the necessity of deuteration for optimal spectral quality, the superiority of 13CH3 isotopomers for methyl groups at high MAS frequencies, and the sensitivity enhancement with increased static magnetic field.
PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Suochang Xu, Nicholas R. Jaegers, Wenda Hu, Ja Hun Kwak, Xinhe Bao, Junming Sun, Yong Wang, Jian Zhi Hu
Summary: In this study, detailed analysis of three aluminum oxide phases was conducted using high-field NMR, revealing structural information of different aluminum sites and providing a method to quantify complex mixtures of aluminum sites in transition alumina samples. The results showcase the potential of high-field NMR in characterizing materials and identifying distinct phases within a sample.
Article
Biochemistry & Molecular Biology
Hang Xiao, Zhengfeng Zhang, Yongxiang Zhao, Jun Yang
Summary: Spectral editing is essential for simplifying crowded solid-state NMR spectra of proteins. New techniques utilizing selective C-13 alpha-C-13 beta double-quantum filtering show promise in efficiently selecting signals of specific amino acid residues. These methods have the potential to streamline spectral analyses in biological solid-state NMR.
JOURNAL OF BIOMOLECULAR NMR
(2021)
Review
Biophysics
Leo L. Cheng
Summary: This article provides a history of the discovery and recent developments of high-resolution magic angle spinning (HRMAS) NMR, a technique used for intact biological material analysis. HRMAS NMR metabolomics studies have been applied in various fields such as human disease states, plant and food analysis, and cell structure studies. The article also discusses the potential applications of HRMAS NMR in future biomedical investigations.
NMR IN BIOMEDICINE
(2023)
Article
Chemistry, Multidisciplinary
K. A. Russ, P. Elvati, T. L. Parsonage, A. Dews, J. A. Jarvis, M. Ray, B. Schneider, P. J. S. Smith, P. T. F. Williamson, A. Violi, M. A. Philbert
Article
Biophysics
Maiwenn Beaugrand, Alexandre A. Arnold, Steve Bourgault, Philip T. F. Williamson, Isabelle Marcotte
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
(2017)
Article
Biochemistry & Molecular Biology
M. M. Jolly, J. A. Jarvis, M. Carravetta, M. H. Levitt, P. T. F. Williamson
JOURNAL OF BIOMOLECULAR NMR
(2017)
Article
Multidisciplinary Sciences
Giuliana Fusco, Serene W. Chen, Philip T. F. Williamson, Roberta Cascella, Michele Perni, James A. Jarvis, Cristina Cecchi, Michele Vendruscolo, Fabrizio Chiti, Nunilo Cremades, Liming Ying, Christopher M. Dobson, Alfonso De Simone
Article
Multidisciplinary Sciences
Alena Koukalova, Mariana Amaro, Gokcan Aydogan, Gerhard Grobner, Philip T. F. Williamson, Ilya Mikhalyov, Martin Hof, Radek Sachl
SCIENTIFIC REPORTS
(2017)
Article
Biochemical Research Methods
Maria Concistre, Ilya Kuprov, Ibraheem M. Haies, Philip T. Williamson, Marina Carravetta
JOURNAL OF MAGNETIC RESONANCE
(2019)
Article
Biochemistry & Molecular Biology
Luke S. Evans, Rohanah Hussain, Giuliano Siligardi, Philip T. F. Williamson
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
(2020)
Article
Chemistry, Multidisciplinary
Maria Concistre, Subhradip Paul, Marina Carravetta, Ilya Kuprov, Philip T. F. Williamson
CHEMISTRY-A EUROPEAN JOURNAL
(2020)
Article
Chemistry, Multidisciplinary
Zhong Wang, Hannah R. Felstead, Robert I. Troup, Bruno Linclau, Philip T. F. Williamson
Summary: Bioactive compounds require crossing membranes to reach their site of action. The octanol-water partition coefficient (logP(OW)) serves as a reliable proxy for membrane permeability. In drug discovery, both logP(OW) and bioactivity are optimized together, and fluorination is one of the relevant strategies. This study examined the correlation between logP(OW) values and membrane molar partitioning coefficients (logK(p)) using lipid vesicles and found that factors affecting logP modifications also affect membrane permeability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Meeting Abstract
Biophysics
Callum P. M. Waller, Peter J. Bond, Syma Khalid, Philip T. F. Williamson, Eilish W. McBurnie, Jan K. Marzinek
BIOPHYSICAL JOURNAL
(2023)
Article
Chemistry, Physical
James A. Jarvis, Maria Concistre, Ibraheem M. Haies, Richard W. Bounds, Ilya Kuprov, Marina Carravetta, Philip T. F. Williamson
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
J. A. Jarvis, I. Haies, M. Lelli, A. J. Rossini, I. Kuprov, M. Carravetta, P. T. F. Williamson
CHEMICAL COMMUNICATIONS
(2017)
Article
Chemistry, Analytical
Josip Ivica, Philip T. F. Williamson, Maurits R. R. de Planque
ANALYTICAL CHEMISTRY
(2017)
Meeting Abstract
Biophysics
Maria Concistre, James A. Jarvis, Ibraheem M. Haies, Ilya Kuprov, Marina Carravetta, Philip T. F. Williamson
BIOPHYSICAL JOURNAL
(2017)
Meeting Abstract
Biophysics
Luke S. Evans, Rohanah Hussain, Giuliano Siligardi, Philip T. F. Williamson
BIOPHYSICAL JOURNAL
(2017)