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Cantrelle FX, Boll E, Sinnaeve D. Making 1H- 1H Couplings More Accessible and Accurate with Selective 2DJ NMR Experiments Aided by 13C Satellites. Anal Chem 2024; 96:7056-7064. [PMID: 38666447 DOI: 10.1021/acs.analchem.4c00315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
1H-1H coupling constants are one of the primary sources of information for nuclear magnetic resonance (NMR) structural analysis. Several selective 2DJ experiments have been proposed that allow for their individual measurement at pure shift resolution. However, all of these experiments fail in the not uncommon case when coupled protons have very close chemical shifts. First, the coupling between protons with overlapping multiplets is inaccessible due to the inability of a frequency-selective pulse to invert just one of them. Second, the strong coupling condition affects the accuracy of coupling measurements involving third spins. These shortcomings impose a limit on the effectiveness of state-of-the-art experiments, such as G-SERF or PSYCHEDELIC. Here, we introduce two new and complementary selective 2DJ experiments that we coin SERFBIRD and SATASERF. These experiments overcome the aforementioned issues by utilizing the 13C satellite signals at natural isotope abundance, which resolves the chemical shift degeneracy. We demonstrate the utility of these experiments on the tetrasaccharide stachyose and the challenging case of norcamphor, for the latter achieving measurement of all JHH couplings, while only a few were accessible with PSYCHEDELIC. The new experiments are applicable to any organic compound and will prove valuable for configurational and conformational analyses.
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Affiliation(s)
- François-Xavier Cantrelle
- CNRS EMR 9002 ─ Integrative Structural Biology, F-59000 Lille, France
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille UMR 1167 ─ RID-AGE ─ Risk Factors and Molecular Determinants of Aging-Related Diseases, F-59000 Lille, France
| | - Emmanuelle Boll
- CNRS EMR 9002 ─ Integrative Structural Biology, F-59000 Lille, France
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille UMR 1167 ─ RID-AGE ─ Risk Factors and Molecular Determinants of Aging-Related Diseases, F-59000 Lille, France
| | - Davy Sinnaeve
- CNRS EMR 9002 ─ Integrative Structural Biology, F-59000 Lille, France
- Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille UMR 1167 ─ RID-AGE ─ Risk Factors and Molecular Determinants of Aging-Related Diseases, F-59000 Lille, France
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Bertho G, Oumezziane IE, Caradeuc C, Guibout L, Balducci C, Dinan L, Dilda PJ, Camelo S, Lafont R, Giraud N. Structural analysis of unstable norbixin isomers guided by pure shift nuclear magnetic resonance. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:504-514. [PMID: 35075680 DOI: 10.1002/mrc.5252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/19/2022] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
We report the analysis of complex samples obtained during the microwave irradiation/heating of norbixin, which has been identified as a potential therapeutic target for age-related macular degeneration (AMD). In this context, identifying the different isomers that are obtained during its degradation is of primary importance. However, this characterization is challenging because, on the one hand, some of these isomers are unstable, and on the other hand, the 1 H spectra of these isomeric mixtures are poorly resolved. We could successfully apply 1D pure shift experiments to obtain ultrahigh-resolution 1 H nuclear magnetic resonance (NMR) spectra of the norbixin isomer samples and exploit their information content to analyze complementary 2D NMR data and describe accurately their isomeric composition.
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Affiliation(s)
- Gildas Bertho
- Université de Paris, CNRS, Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Paris, France
| | - Imed Eddine Oumezziane
- Université de Paris, CNRS, Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Paris, France
| | - Cédric Caradeuc
- Université de Paris, CNRS, Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Paris, France
| | | | | | | | | | | | - René Lafont
- Biophytis, Sorbonne University, Paris, France
- Paris-Seine Biology Institute (BIOSIPE), CNRS, Sorbonne University, Paris, France
| | - Nicolas Giraud
- Université de Paris, CNRS, Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, Paris, France
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Aloui G, Bouabdallah S, Baltaze JP, Pucheta JEH, Touil S, Farjon J, Giraud N. Monitoring Conformational Changes in an Enzyme Conversion Inhibitor Using Pure Shift Exchange NMR Spectroscopy. Chemphyschem 2019; 20:1738-1746. [PMID: 31033157 DOI: 10.1002/cphc.201900244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 04/25/2019] [Indexed: 11/06/2022]
Abstract
We report the acquisition of 2D NMR EXSY spectra with ultrahigh resolution, which allows for probing the slow conformational exchange process in a pharmaceutical compound. The resolution enhancement is achieved by implementing interferogram based PSYCHE homonuclear decoupling to generate a pure shift proton spectrum along the direct domain of the resulting data. The performance of this pure shift EXSY pulse sequence is compared to the standard experiment recorded under identical conditions. It is found that although being less sensitive and requiring a longer acquisition time, the quality of pure shift spectra allows for extracting exchange rates values that are coherent with the ones determined by standard approach, on a temperature range that demonstrates the robustness of the chosen homonuclear decoupling method. The resolution enhancement provided by the simplification of proton line shape allows for probing a higher number of proton sites whose analysis would have been biased using a standard method. These results open the way to a thorough and accurate study of chemical exchange processes based on a multi-site analysis of 2D pure shift EXSY spectra.
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Affiliation(s)
- G Aloui
- Université Paris Saclay, Institut de Chimie Moléculaire et des Matériaux d'Orsay Equipe RMN en Milieu Orienté UMR CNRS-UPS 8182, 91405, Orsay, France.,Laboratory of Hetero-Organic Compounds and Nanostructured Materials, University of Carthage, Faculty of Sciences of Bizerte, 7021, Jarzouna, Tunisia
| | - S Bouabdallah
- Laboratory of Hetero-Organic Compounds and Nanostructured Materials, University of Carthage, Faculty of Sciences of Bizerte, 7021, Jarzouna, Tunisia
| | - J P Baltaze
- Université Paris Saclay, Institut de Chimie Moléculaire et des Matériaux d'Orsay Equipe RMN en Milieu Orienté UMR CNRS-UPS 8182, 91405, Orsay, France
| | - J E H Pucheta
- Consejo Nacional de Ciencia y Tecnología - Laboratorio Nacional de Investigación y Servicio Agroalimentario y Forestal, Universidad Autónoma Chapingo, Km. 38.5 Carretera México-Texcoco, Chapingo, 56230, Estado de México, México
| | - S Touil
- Laboratory of Hetero-Organic Compounds and Nanostructured Materials, University of Carthage, Faculty of Sciences of Bizerte, 7021, Jarzouna, Tunisia
| | - J Farjon
- CEISAM UMR CNRS 6230, Faculté des Sciences et Techniques, 2 rue de la Houssinière, BP, 92208, 44322 Nantes cedex 3, France
| | - N Giraud
- Université Paris Saclay, Institut de Chimie Moléculaire et des Matériaux d'Orsay Equipe RMN en Milieu Orienté UMR CNRS-UPS 8182, 91405, Orsay, France.,Laboratory of Pharmacological and Toxicological Chemistry and Biochemistry, Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints Pères, 75006, Paris, France
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Rao Kakita VM, Joshi MV, Hosur RV. G-SERF Editing in Two-Dimensional Pure-Shift Total Correlation Spectroscopy: Scalar Coupling Measurements for a Group of Spins in Organic Molecules. Chemphyschem 2019; 20:1559-1566. [PMID: 30997947 DOI: 10.1002/cphc.201900174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/13/2019] [Indexed: 11/10/2022]
Abstract
A novel G-SERF-PSYCHE-TOCSY (gradient encoded selective refocusing in pure shift yielded by chirp excitation version of total correlation spectroscopy) NMR pulse scheme has been proposed, which produces TOCSY chemical shift correlations, on one hand, and scalar coupling values for the spins scalarly coupled to irradiated resonances, by showing them as doublets along the indirect dimension, on the other. Therefore, recording such an experiment, for a group of spins with overlapping chemical shifts, in organic molecules can adequately provide scalar coupling information in a G-SERF manner along the indirect dimensions, and they can be assigned to particular spin pairs. Such COSY chemical shift correlations (which appear as doublets for the scalarly coupled spins) can be readily discriminated from the TOCSY peaks (which do not show such splitting) in the G-SERF-PSYCHE-TOCSY spectrum.
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Affiliation(s)
- Veera Mohana Rao Kakita
- UM-DAE-Centre for Excellence in Basic Sciences, University of Mumbai, Kalina Campus, Santacruz, Mumbai, 400 098, India
| | - Mamata V Joshi
- Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR), 1-Homi Bhabha Road, Colaba, Mumbai, 400 005, India
| | - Ramakrishna V Hosur
- UM-DAE-Centre for Excellence in Basic Sciences, University of Mumbai, Kalina Campus, Santacruz, Mumbai, 400 098, India.,Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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Lin Y, Zeng Q, Lin L, Chen Z, Barker PB. High-resolution methods for the measurement of scalar coupling constants. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2018; 109:135-159. [PMID: 30527134 DOI: 10.1016/j.pnmrs.2018.08.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 08/14/2018] [Accepted: 08/14/2018] [Indexed: 06/09/2023]
Abstract
Scalar couplings provide important information regarding molecular structure and dynamics. The measurement of scalar coupling constants constitutes a topic of interest and significance in NMR spectroscopy. However, the measurement of J values is often not straightforward because of complex signal splitting patterns and signal overlap. Many methods have been proposed for the measurement of scalar coupling constants, both for homonuclear and heteronuclear cases. Different approaches to the measurement of scalar coupling constants are reviewed here with several applications presented. The accurate measurement of scalar coupling constants can greatly facilitate molecular structure elucidation and the study of molecule dynamics.
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Affiliation(s)
- Yanqin Lin
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, Fujian 361005, China.
| | - Qing Zeng
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, Fujian 361005, China
| | - Liangjie Lin
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, Fujian 361005, China
| | - Zhong Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen, Fujian 361005, China
| | - Peter B Barker
- Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; F. M. Kirby Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD 21205, USA
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Dumez JN. Spatial encoding and spatial selection methods in high-resolution NMR spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2018; 109:101-134. [PMID: 30527133 DOI: 10.1016/j.pnmrs.2018.08.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 08/01/2018] [Accepted: 08/01/2018] [Indexed: 06/09/2023]
Abstract
A family of high-resolution NMR methods share the common concept of acquiring in parallel different sub-experiments in different spatial regions of the NMR tube. These spatial encoding and spatial selection methods were for the most part introduced independently from each other and serve different purposes, but they share common ingredients, often derived from magnetic resonance imaging, and they all benefit from a greatly improved time-efficiency. This review article provides a description of several spatial encoding and spatial selection methods, including single-scan multidimensional experiments (ultrafast 2D NMR, DOSY, Z spectroscopy, inversion recovery and Laplace NMR), pure shift and selective refocusing experiments (including Zangger-Sterk decoupling, G-SERF and PSYCHE), a Z filter, and fast-pulsing slice-selective experiments. Some key elements for spatial parallelisation are introduced and when possible a common framework is used for the analysis of each method. Sensitivity considerations are discussed, and a selection of applications is analysed to illustrate which questions can be answered thanks to spatial encoding and spatial selection methods, and discuss the perspectives for future developments and applications.
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Affiliation(s)
- Jean-Nicolas Dumez
- Institut de Chimie des Substances Naturelles, CNRS UPR2301, Univ. Paris Sud, Université Paris-Saclay, Avenue de la Terrasse, 91190 Gif-sur-Yvette, France.
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