1
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Doro-Goldsmith E, Song Q, Li XL, Li XM, Hu XY, Li HL, Liu HR, Wang BG, Sun H. Absolute Configuration of 12 S-Deoxynortryptoquivaline from Ascidian-Derived Fungus Aspergillus clavatus Determined by Anisotropic NMR and Chiroptical Spectroscopy. JOURNAL OF NATURAL PRODUCTS 2024; 87:381-387. [PMID: 38289330 PMCID: PMC10897928 DOI: 10.1021/acs.jnatprod.3c01157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 01/09/2024] [Accepted: 01/09/2024] [Indexed: 02/24/2024]
Abstract
Tryptoquivalines are highly toxic metabolites initially isolated from the fungus Aspergillus clavatus. The relative and absolute configuration of tryptoquivaline derivates was primarily established by comparison of the chemical shifts, NOE data, and ECD calculations. A de novo determination of the complete relative configuration using NMR spectroscopy was challenging due to multiple spatially separated stereocenters, including one nonprotonated carbon. In this study, we isolated a new tryptoquivaline derivative, 12S-deoxynortryptoquivaline (1), from the marine ascidian-derived fungus Aspergillus clavatus AS-107. The correct assignment of the relative configuration of 1 was accomplished using anisotropic NMR spectroscopy, while the absolute configuration was determined by comparing calculated and experimental ECD spectra. This case study highlights the effectiveness of anisotropic NMR parameters over isotropic NMR parameters in determining the relative configuration of complex natural products without the need for crystallization.
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Affiliation(s)
- Elisa Doro-Goldsmith
- Leibniz-Forschungsinstitut
für Molekulare Pharmakologie (FMP), Robert-Rössle-Strasse 10, Berlin 13125, Germany
- School
of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Qi Song
- CAS
and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, China
| | - Xiao-Lu Li
- Leibniz-Forschungsinstitut
für Molekulare Pharmakologie (FMP), Robert-Rössle-Strasse 10, Berlin 13125, Germany
| | - Xiao-Ming Li
- CAS
and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, China
| | - Xue-Yi Hu
- CAS
and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, China
| | - Hong-Lei Li
- CAS
and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, China
| | - Hao-Ran Liu
- Leibniz-Forschungsinstitut
für Molekulare Pharmakologie (FMP), Robert-Rössle-Strasse 10, Berlin 13125, Germany
- Institute
of Chemistry, Technische Universität
Berlin, Straße des
17. Juni 135, Berlin 10623, Germany
| | - Bin-Gui Wang
- CAS
and Shandong Province Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Nanhai Road 7, Qingdao 266071, China
- University
of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China
| | - Han Sun
- Leibniz-Forschungsinstitut
für Molekulare Pharmakologie (FMP), Robert-Rössle-Strasse 10, Berlin 13125, Germany
- Institute
of Chemistry, Technische Universität
Berlin, Straße des
17. Juni 135, Berlin 10623, Germany
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2
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Julien T, Gouilleux B, Rousseau B, Immel S, Reggelin M, Lesot P. Spatially Resolved Anisotropic Natural Abundance Deuterium 2D-NMR Spectroscopy Using Bimesophasic Lyotropic Chiral Systems. J Phys Chem Lett 2024; 15:2089-2095. [PMID: 38358651 DOI: 10.1021/acs.jpclett.3c03302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
In this paper, we describe, for the first time, the combined and original use of spatially resolved anisotropic natural abundance deuterium (ANAD) 2D-NMR experiments and bimesophasic lyotropic chiral systems to extract two independent sets of anisotropic parameters such as 2H-RQCs from a single NMR sample. As a pioneering example, we focus on a mixture of immiscible polypeptides (PBLG) and polyacetylene helical polymers (L-MSP) dissolved in weakly polar organic solvents (chloroform). Nondeuterated (D)-(+)-camphor is used as a model chiral solute. By providing two series of 2H-RQCs, this new analytical approach paves the way for applications in 3D structure elucidation with increased reliability and also opens up original investigations in terms of spectral enantiomeric discriminations and mixing of helical polymers.
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Affiliation(s)
- Thomas Julien
- RMN en Milieu Orienté, Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO), UMR 8182, Université Paris-Saclay, UFR des Sciences d'Orsay, 17-19, Avenue des Sciences, F-91400 Orsay, France
| | - Boris Gouilleux
- RMN en Milieu Orienté, Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO), UMR 8182, Université Paris-Saclay, UFR des Sciences d'Orsay, 17-19, Avenue des Sciences, F-91400 Orsay, France
| | - Bernard Rousseau
- RMN en Milieu Orienté, Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO), UMR 8182, Université Paris-Saclay, UFR des Sciences d'Orsay, 17-19, Avenue des Sciences, F-91400 Orsay, France
- Centre National de la Recherche Scientifique (CNRS), 3, Rue Michel Ange, F-75016 Paris, France
| | - Stefan Immel
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie Technische, Universität Darmstadt, Peter Grünberg-Strasse 4, 64287 Darmstadt, Germany
| | - Michael Reggelin
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie Technische, Universität Darmstadt, Peter Grünberg-Strasse 4, 64287 Darmstadt, Germany
| | - Philippe Lesot
- RMN en Milieu Orienté, Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO), UMR 8182, Université Paris-Saclay, UFR des Sciences d'Orsay, 17-19, Avenue des Sciences, F-91400 Orsay, France
- Centre National de la Recherche Scientifique (CNRS), 3, Rue Michel Ange, F-75016 Paris, France
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3
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Fuentes-Monteverde JC, Noll M, Das A, Immel S, Reggelin M, Griesinger C, Nath N. Residual-Chemical-Shift-Anisotropy-Based Enantiodifferentiation in Lyotropic Liquid Crystalline Phases Based on Helically Chiral Polyacetylenes. Angew Chem Int Ed Engl 2023; 62:e202309981. [PMID: 37684219 DOI: 10.1002/anie.202309981] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/25/2023] [Accepted: 09/06/2023] [Indexed: 09/10/2023]
Abstract
Anisotropic NMR spectroscopy, revealing residual dipolar couplings (RDCs) and residual chemical shift anisotropies (RCSAs) has emerged as a powerful tool to determine the configurations of synthetic and complex natural compounds. The deduction of the absolute in addition to the relative configuration is one of the primary goals in the field. Therefore, the investigation of the enantiodiscriminating capabilities of chiral alignment media becomes essential. While RDCs and RCSAs are now used for the determination of the relative configuration routinely, RCSAs have not been measured in chiral alignment media such as chiral liquid crystals. Herein, we present this application by measuring RCSAs for chiral analytes such as indanol and isopinocampheol in the lyotropic liquid crystalline phase of an L-valine derived helically chiral polyacetylenes. We have also demonstrated that a single 1D 13 C-{1 H} NMR spectrum suffices to get the RCSAs circumventing the necessity to acquire two spectra at two alignment conditions.
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Affiliation(s)
- Juan Carlos Fuentes-Monteverde
- Max Planck Institute for Multidisciplinary Sciences, Department of NMR-Based Structural Biology, Am Fassberg 11, 37077, Göttingen, Germany
| | - Markus Noll
- Department of Chemistry, Technical University of Darmstadt, Alarich Weiss Straße 4, 64287, Darmstadt, Germany
| | - Akhi Das
- Department of Chemistry, Gauhati University Guwahati, Jalukbari, 781014, India
| | - Stefan Immel
- Department of Chemistry, Technical University of Darmstadt, Alarich Weiss Straße 4, 64287, Darmstadt, Germany
| | - Michael Reggelin
- Department of Chemistry, Technical University of Darmstadt, Alarich Weiss Straße 4, 64287, Darmstadt, Germany
| | - Christian Griesinger
- Max Planck Institute for Multidisciplinary Sciences, Department of NMR-Based Structural Biology, Am Fassberg 11, 37077, Göttingen, Germany
| | - Nilamoni Nath
- Department of Chemistry, Gauhati University Guwahati, Jalukbari, 781014, India
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4
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Venturi L, Bua E, Caputo G, Mileo V. Residual Dipolar Coupling Based Conformational Analysis Allows the Configurational Assessment of Steroids with up to Eight Stereocenters. Chempluschem 2023; 88:e202200391. [PMID: 36811319 DOI: 10.1002/cplu.202200391] [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: 11/07/2022] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 02/24/2023]
Abstract
Residual dipolar couplings (RDCs) induced by anisotropic media have been proved as a powerful tool for the structure elucidation of organic molecules in solution in nuclear magnetic resonance (NMR) based analysis. The value of dipolar couplings to solve complex conformational and configurational problems represents indeed an appealing analytical tool for the pharmaceutical industry particularly focusing on the stereochemistry characterization of NCEs since the early phase of the drug development process. In our work, RDCs were used for the conformational and configurational study of synthetic steroids with multiple stereocenters - prednisone and beclomethasone dipropionate (BDP) -. For both molecules the correct relative configuration was identified among all the possible diastereoisomers (32 and 128 respectively) arising from the compounds stereogenic carbons. Only for prednisone the use of additional experimental data (i. e. rOes) was necessary to resolve the right stereochemical structure.
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Affiliation(s)
- Luca Venturi
- Preclinical Analytics and Early Formulations Department, Chiesi Farmaceutici Spa, Largo Belloli 11/A, 43123, Parma, PR, Italy
| | - Emanuela Bua
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, PR, Italy
| | - Giulia Caputo
- Pharmacy Department, University "G. d'Annunzio" of Chieti-Pescara, Via dei Vestini, 66100, Chieti, CH, Italy
| | - Valentina Mileo
- Preclinical Analytics and Early Formulations Department, Chiesi Farmaceutici Spa, Largo Belloli 11/A, 43123, Parma, PR, Italy
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5
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Gouilleux B, Moussallieh FM, Lesot P. Anisotropic 1 H STD-NMR Spectroscopy: Exploration of Enantiomer-Polypeptide Interactions in Chiral Oriented Environments. Chemphyschem 2023; 24:e202200508. [PMID: 36196851 DOI: 10.1002/cphc.202200508] [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: 07/13/2022] [Revised: 10/01/2022] [Indexed: 11/07/2022]
Abstract
We explore and report for the first time the use of 1 H saturation transfer difference NMR experiments (STD-NMR) in weakly aligning chiral anisotropic media to identify the hydrogen sites of enantiomers of small chiral molecules interacting with the side-chain of poly-γ-benzyl-l-glutamate (PBLG), a helically chiral polypeptide polymer. The first experimental results obtained on three model mono-stereogenic compounds outcomes are highly promising and demonstrate the possibility to track down possible differences of spatial position of enantiomers at the vicinity of the polymer side-chain. Anisotropic STD experiments appear to be well suited for rapid screening of chiral analytes that bind favorably to orienting polymeric systems, while providing new insights into the mechanism of enantio-discrimination without resorting to the time-consuming determination of molecular order parameters.
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Affiliation(s)
- Boris Gouilleux
- Université Paris-Saclay, UFR d'Orsay, RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Bât. 410, 15, rue du Doyen Georges Poitou, 91405, Orsay cedex, France
| | - Francois-Marie Moussallieh
- Université Paris-Saclay, UFR d'Orsay, RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Bât. 410, 15, rue du Doyen Georges Poitou, 91405, Orsay cedex, France
| | - Philippe Lesot
- Université Paris-Saclay, UFR d'Orsay, RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Bât. 410, 15, rue du Doyen Georges Poitou, 91405, Orsay cedex, France.,Centre National de la Recherche Scientifique (CNRS), 3, rue Michel Ange, 75016, Paris, France
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6
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Stereochemical investigation of flexible macrocyclic cembranes depending on residual dipolar couplings method. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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7
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Krishnarjuna B, Ravula T, Faison EM, Tonelli M, Zhang Q, Ramamoorthy A. Polymer-Nanodiscs as a Novel Alignment Medium for High-Resolution NMR-Based Structural Studies of Nucleic Acids. Biomolecules 2022; 12:1628. [PMID: 36358983 PMCID: PMC9687133 DOI: 10.3390/biom12111628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/28/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
Residual dipolar couplings (RDCs) are increasingly used for high-throughput NMR-based structural studies and to provide long-range angular constraints to validate and refine structures of various molecules determined by X-ray crystallography and NMR spectroscopy. RDCs of a given molecule can be measured in an anisotropic environment that aligns in an external magnetic field. Here, we demonstrate the first application of polymer-based nanodiscs for the measurement of RDCs from nucleic acids. Polymer-based nanodiscs prepared using negatively charged SMA-EA polymer and zwitterionic DMPC lipids were characterized by size-exclusion chromatography, 1H NMR, dynamic light-scattering, and 2H NMR. The magnetically aligned polymer-nanodiscs were used as an alignment medium to measure RDCs from a 13C/15N-labeled fluoride riboswitch aptamer using 2D ARTSY-HSQC NMR experiments. The results showed that the alignment of nanodiscs is stable for nucleic acids and nanodisc-induced RDCs fit well with the previously determined solution structure of the riboswitch. These results demonstrate that SMA-EA-based lipid-nanodiscs can be used as a stable alignment medium for high-resolution structural and dynamical studies of nucleic acids, and they can also be applicable to study various other biomolecules and small molecules in general.
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Affiliation(s)
- Bankala Krishnarjuna
- Biophysics Program, Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Thirupathi Ravula
- Biophysics Program, Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA
- National Magnetic Resonance Facility at Madison, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Edgar M. Faison
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Marco Tonelli
- National Magnetic Resonance Facility at Madison, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Qi Zhang
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Ayyalusamy Ramamoorthy
- Biophysics Program, Department of Chemistry, Biomedical Engineering, and Macromolecular Science and Engineering, Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA
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8
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Yassin A, Nehmeh B, Kantar SE, Al Kazzaz Y, Akoury E. Synthesis of lanthanide tag and experimental studies on paramagnetically induced residual dipolar couplings. BMC Chem 2022; 16:54. [PMID: 35864525 PMCID: PMC9306141 DOI: 10.1186/s13065-022-00847-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 07/08/2022] [Indexed: 12/02/2022] Open
Abstract
Nuclear Magnetic Resonance (NMR) spectroscopy is an indispensable technique for the structure elucidation of molecules and determination of their characteristic interactions. Residual Dipolar Coupling (RDC) is an NMR parameter that provides global orientation information of molecules but necessitates the use of an anisotropic orientation medium for the partial alignment of the target molecule with respect to the magnetic field. Importantly, anisotropic paramagnetic tags have been successful as orienting media in biomolecular NMR applications but their use in small organic molecules remains imperfect due to challenges in designing functional lanthanide complexes with varying degrees of bonding in the Ln(III) inner coordination sphere. In this study, we propose a strategy for the synthesis of the lanthanide tag 4-mercaptomethylpyridine-2,6-dicarboxylic acid, 4-MMDPA and the measurement of RDCs in a target molecule using several paramagnetic lanthanide complexes.
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Affiliation(s)
- Ali Yassin
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University, Beirut, 1102-2801, Lebanon.,Inorganic and Organometallic Coordination Chemistry Laboratory, Faculty of Science, LCIO, Lebanese University, Beirut, Lebanon
| | - Bilal Nehmeh
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University, Beirut, 1102-2801, Lebanon
| | - Sally El Kantar
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University, Beirut, 1102-2801, Lebanon.,TIMR (Integrated Transformations of Renewable Matter), Centre de Recherche Royallieu, Université de Technologie de Compiègne, ESCOM, CS 60 319, 60203, Compiègne Cedex, France
| | - Yara Al Kazzaz
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University, Beirut, 1102-2801, Lebanon
| | - Elias Akoury
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University, Beirut, 1102-2801, Lebanon. .,Department of Chemistry, Faculty of Chemistry and Pharmacy, Ludwig Maximilian University, 81377, Munich, Germany.
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9
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Yu G, Wang G, Duan M, Jiang B, Zhang X, Li C, He L, Liu M. Self-Assembled Oligopeptide (FK) 4 as a Chiral Alignment Medium for the Anisotropic NMR Analysis of Organic Compounds. ACS APPLIED MATERIALS & INTERFACES 2022; 14:29223-29229. [PMID: 35712808 DOI: 10.1021/acsami.2c05506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Anisotropic NMR parameters have been proven to be powerful for the structural elucidation of organic molecules. Herein, we present an alignment medium based on the self-assembled (FK)4 oligopeptide, showing excellent properties in measurements of anisotropic NMR parameters in both D2O and CD3OD. The preparation of the (FK)4-based alignment medium is simple and rapid. The low viscosity of the anisotropic phase makes it easy to be transferred to the NMR tube. The alignment of the oligopeptide is fast, stable, and homogeneous, with weak background signals, permitting the acquirement of high-quality NMR spectra. The performance of this alignment medium in residual dipolar coupling measurements and diastereomer discriminations is demonstrated by analyzing several different analytes. The enantiodiscrimination property of the (FK)4 oligopeptide is revealed by the difference of residual chemical shift anisotropy of the two enantiomers in the 1D 13C spectrum, granting its potential use for the quantification and identification of enantiomers of small molecules.
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Affiliation(s)
- Gangjin Yu
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guan Wang
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mojie Duan
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bin Jiang
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xu Zhang
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Conggang Li
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lichun He
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Maili Liu
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Optics Valley Laboratory, Hubei 430074, China
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10
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Immel S, Köck M, Reggelin M. Bayesian Inference Applied to NMR-Based Configurational Assignments by Floating Chirality Distance Geometry Calculations. J Am Chem Soc 2022; 144:6830-6838. [PMID: 35412312 DOI: 10.1021/jacs.2c00813] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using NMR data, the assignment of the correct 3D configuration and conformation to unknown natural products is of pivotal importance in pharmaceutical and medicinal chemistry. In this report, we quantify the quality and probability of structural elucidations using Bayesian inference in combination with floating chirality distance geometry simulations. Here, we will discuss the configurational analysis of three complex natural products including isopinocampheol (1), plakilactone H (2), and iodocallophycoic acid A (3) using NMR restraints of various types and in different combinations (residual dipolar couplings (RDCs) and NOE-derived distances). Our results quantitatively demonstrate how reliably molecular geometries can be inferred from experimental NMR data, unequivocally unveiling remaining assignment ambiguities. The methodology presented here can dramatically reduce the risk of incorrect structural assignments based on the overinterpretation of incomplete data in chemistry.
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Affiliation(s)
- Stefan Immel
- Clemens Schöpf Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287 Darmstadt, Germany
| | - Matthias Köck
- Alfred-Wegener-Institut für Polar- and Meeresforschung in der Helmholtz-Gemeinschaft, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Michael Reggelin
- Clemens Schöpf Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287 Darmstadt, Germany
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11
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Berdagué P, Gouilleux B, Noll M, Immel S, Reggelin M, Lesot P. Study and quantification of enantiodiscrimination power of four polymeric chiral LLCs using NAD 2D-NMR. Phys Chem Chem Phys 2022; 24:7338-7348. [DOI: 10.1039/d1cp04915a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Identifying and understanding the role of key molecular factors involved in the orientation/discrimination phenomena of analytes in polymer-based chiral liquid crystals (CLCs) are essential tasks for optimizing computational predictions (molecular...
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12
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Aroulanda C, Lesot P. Molecular enantiodiscrimination by NMR spectroscopy in chiral oriented systems: Concept, tools, and applications. Chirality 2021; 34:182-244. [PMID: 34936130 DOI: 10.1002/chir.23386] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 09/20/2021] [Accepted: 10/15/2021] [Indexed: 11/06/2022]
Abstract
The study of enantiodiscriminations in relation to various facets of enantiomorphism (chirality/prochirality) and/or molecular symmetry is an exciting area of modern organic chemistry and an ongoing challenge for nuclear magnetic resonance (NMR) spectroscopists who have developed many useful analytical approaches to solve stereochemical problems. Among them, the anisotropic NMR using chiral aligning solvents has provided a set of new and original tools by making accessible all intramolecular, order-dependent NMR interactions (anisotropic interactions), such as residual chemical shift anisotropy (RCSA), residual dipolar coupling (RDC), and residual quadrupolar coupling (RQC) for spin I > 1/2, while preserving high spectral resolution. The force of NMR in enantiopure, oriented solvents lies on its ability to orient differently in average on the NMR timescale enantiomers of chiral molecules and enantiotopic elements of prochiral ones, leading distinct NMR spectra or signals to be detected. In this compendium mainly written for all chemists playing with (pro)chirality, we overview various key aspects of NMR in weakly aligning chiral solvents as the lyotropic liquid crystals (LLCs), in particular those developed in France to study (pro)chiral compounds in relation with chemists needs: study of enantiopurity of mixture, stereochemistry, natural isotopic fractionation, as well as molecular conformation and configuration. Key representative examples covering the diversity of enantiomorphism concept, and the main and most recent applications illustrating the analytical potential of this NMR in polypeptide-based chiral liquid crystals (CLCs) are examined. The latest analytical strategy developed to determine in-solution conformational distribution of flexibles solutes using NMR in polypeptide-based aligned solvents is also proposed.
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Affiliation(s)
- Christie Aroulanda
- RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Université Paris-Saclay, Orsay cedex, France
| | - Philippe Lesot
- RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Université Paris-Saclay, Orsay cedex, France
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13
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Peintner S, Erdélyi M. Pushing the Limits of Characterising a Weak Halogen Bond in Solution. Chemistry 2021; 28:e202103559. [PMID: 34807488 PMCID: PMC9300211 DOI: 10.1002/chem.202103559] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Indexed: 01/06/2023]
Abstract
Detection and characterisation of very weak, non-covalent interactions in solution is inherently challenging. Low affinity, short complex lifetime and a constant battle against entropy brings even the most sensitive spectroscopic methods to their knees. Herein we introduce a strategy for the accurate experimental description of weak chemical forces in solution. Its scope is demonstrated by the detailed geometric and thermodynamic characterisation of the weak halogen bond of a non-fluorinated aryl iodide and an ether oxygen (0.6 kJ mol-1 ). Our approach makes use of the entropic advantage of studying a weak force intramolecularly, embedded into a cooperatively folding system, and of the combined use of NOE- and RDC-based ensemble analyses to accurately describe the orientation of the donor and acceptor sites. Thermodynamic constants (ΔG, ΔH and ΔS), describing the specific interaction, were derived from variable temperature chemical shift analysis. We present a methodology for the experimental investigation of remarkably weak halogen bonds and other related weak forces in solution, paving the way for their improved understanding and strategic use in chemistry and biology.
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Affiliation(s)
- Stefan Peintner
- Department of Chemistry - BMC, Uppsala University, SE-751, 23, Uppsala, Sweden
| | - Máté Erdélyi
- Department of Chemistry - BMC, Uppsala University, SE-751, 23, Uppsala, Sweden
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