1
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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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2
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Silva Elipe MV, Ndukwe IE, Navarro-Vázquez A. Anisotropic NMR data acquisition with a prototype 400 MHz cryogen-free NMR spectrometer. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2023; 61:530-543. [PMID: 37530063 DOI: 10.1002/mrc.5380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 06/22/2023] [Accepted: 06/26/2023] [Indexed: 08/03/2023]
Abstract
High-temperature superconducting (HTS) materials have recently been incorporated into the construction of HTS cryogen-free magnets for nuclear magnetic resonance (NMR) spectroscopy. These HTS NMR spectrometers do not require liquid cryogens, thereby providing significant cost savings and facilitating easy integration into chemistry laboratories. However, the optimal performance of these HTS magnets against standard cryogen NMR magnets must be evaluated, especially with demanding modern NMR applications such as NMR in anisotropic media. The stability of the HTS magnets over time and their performance with complex pulse sequence experiments are the main unknown factors of this new technology. In this study, we evaluate the utility of our prototype 400 MHz cryogen-free power-driven HTS NMR spectrometer, installed in the fumehood of a chemistry laboratory, for stereochemical analysis of three commercial natural products (artemisinin, artemether, and dihydroartemisinin) via measurement of anisotropic NMR data, in particular, residual dipolar couplings. The accuracy of measurement of the anisotropic NMR data with the HTS magnet spectrometer is evaluated through the CASE-3D fitting protocol, as implemented in the Mestrenova-StereoFitter software program.
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Affiliation(s)
| | | | - Armando Navarro-Vázquez
- Departmento de Química Fundamental, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
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3
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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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4
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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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5
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Krupp A, Noll M, Reggelin M. Valine derived poly (acetylenes) as versatile chiral lyotropic liquid crystalline alignment media for RDC-based structure elucidations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:577-586. [PMID: 32012341 DOI: 10.1002/mrc.5003] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 01/22/2020] [Accepted: 01/27/2020] [Indexed: 06/10/2023]
Abstract
Anisotropic samples of lyotropic liquid crystalline (LLC) phases of valine derived polyaryl acetylenes were employed as chiral alignment media for the measurement of residual dipolar couplings (RDCs) of 12 small, chiral, organic molecules. The quadrupolar splitting of the deuterium signal of CDCl3 can be adjusted by temperature and concentration changes from 0 to 350 Hz. The LLC phases showed excellent orienting properties for all analytes bearing various functional groups. The precise extraction of RDCs in the range of up to ±30 Hz from F2-coupled HSQC spectra was possible. Additionally, the chiral environment led to diastereomorphous interactions with the enantiomers of chiral analytes leading to two different sets of RDCs. This differential order effect was particularly pronounced with H-bond donors like alcohols and 2° amines.
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Affiliation(s)
- Alexis Krupp
- Clemens Schöpf Institut for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Germany
- Nitrochemie Aschau GmbH, Aschau am Inn, Germany
| | - Markus Noll
- Clemens Schöpf Institut for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Germany
| | - Michael Reggelin
- Clemens Schöpf Institut for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Darmstadt, Germany
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6
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Das A, Nath N. Elucidating natural product structures using a robust measurement of carbon residual chemical shift anisotropy combined with DFT. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:569-576. [PMID: 31758720 DOI: 10.1002/mrc.4975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 08/20/2019] [Accepted: 08/31/2019] [Indexed: 06/10/2023]
Abstract
Determination of configurations and conformations is an important step in the structural characterization of small molecules. Apart from utilizing isotropic J-couplings and nuclear overhauser effect (NOEs) measured in isotropic solution, anisotropic Nuclear Magnetic resonance (NMR) data such as residual dipolar couplings and residual chemical shift anisotropies (RCSAs) were also used to elucidate complex small molecule structures. Measuring RCSA has always been historically difficult due to the isotropic shift effect accompanied by molecular alignment and therefore only occasionally applied in a few examples. Here, we present a robust measurement of carbon RCSAs using a smaller gel-stretching device to determine the structures of a few small molecules. A systematic study on how different density functional theory computed anisotropies of the chemical shift anisotropy tensors impact RCSA data interpretation has also been discussed. We also discuss the effect of utilizing various carbons as reference nuclei for RCSA data extraction as well as the orientation behavior of estrone in orthogonal alignment media.
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Affiliation(s)
- Akhi Das
- Department of Chemistry, Gauhati University, Guwahati, India
| | - Nilamoni Nath
- Department of Chemistry, Gauhati University, Guwahati, India
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7
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Ibáñez de Opakua A, Zweckstetter M. Extending the applicability of P3D for structure determination of small molecules. MAGNETIC RESONANCE (GOTTINGEN, GERMANY) 2021; 2:105-116. [PMID: 37904779 PMCID: PMC10539764 DOI: 10.5194/mr-2-105-2021] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 03/15/2021] [Indexed: 11/01/2023]
Abstract
The application of anisotropic nuclear magnetic resonance (NMR) parameters for the correct structural assignment of small molecules requires the use of partially ordered media. Previously we demonstrated that the use of P3D simulations using poly(γ -benzyl-L-glutamate) (PBLG) as an alignment medium allows for the determination of the correct diastereomer from extremely sparse NMR data. Through the analysis of the structural characteristics of small molecules in different alignment media, here we show that when steric or electrostatic factors dominate the alignment, P3D-PBLG retains its diastereomer discrimination power. We also demonstrate that P3D simulations can define the different conformations of a flexible small molecule from sparse NMR data.
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Affiliation(s)
- Alain Ibáñez de Opakua
- German Center for Neurodegenerative Diseases (DZNE), Von-Siebold-Str. 3a, 37075 Göttingen, Germany
| | - Markus Zweckstetter
- German Center for Neurodegenerative Diseases (DZNE), Von-Siebold-Str. 3a, 37075 Göttingen, Germany
- Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, 37077 Göttingen, Germany
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8
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Wang Y, An L, Yang Y, Yao L. Generating Five Independent Molecular Alignments for Simultaneous Protein Structure and Dynamics Determination Using Nuclear Magnetic Resonance Spectroscopy. Anal Chem 2020; 92:15263-15269. [PMID: 33166130 DOI: 10.1021/acs.analchem.0c02882] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Residual dipolar couplings (RDCs) are commonly used in NMR for protein structure and dynamics studies, but it is challenging to generate five independent RDC data sets (required for simultaneous structure and dynamics determination) for most protein molecules in the magnetic field. In this work, a reporter protein with a lanthanide tag is introduced to create five independent alignments. This reporter protein is then attached to target proteins where five independent sets of RDCs are also obtained for the target proteins. The fitting of RDCs provides important information about the structure and dynamics of the target proteins. The method is simple and effective and, in principle, can be used to generate complete sets of RDCs for different protein molecules.
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Affiliation(s)
| | - Liaoyuan An
- University of Chinese Academy of Sciences, Beijing 100049, China
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9
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Recchia MJJ, Cohen RD, Liu Y, Sherer EC, Harper JK, Martin GE, Williamson RT. "One-Shot" Measurement of Residual Chemical Shift Anisotropy Using Poly-γ-benzyl-l-glutamate as an Alignment Medium. Org Lett 2020; 22:8850-8854. [PMID: 33140974 DOI: 10.1021/acs.orglett.0c03225] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A method for the measurement of residual chemical shift anisotropy in one experiment using a biphasic isotropic/anisotropic lyotropic liquid crystalline medium based on poly-γ-benzyl-l-glutamate as the alignment medium is presented. This approach is demonstrated on the model compound strychnine and neotricone, a depsidone natural product with a questionable structural assignment based on comparison with the closely related excelsione and in-depth density functional theory calculations.
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Affiliation(s)
- Michael J J Recchia
- Department of Chemistry & Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28409, United States
| | - Ryan D Cohen
- Analytical Research & Development, Merck & Company Inc., Rahway, New Jersey 07065, United States
| | - Yizhou Liu
- Analytical Research & Development, Pfizer Worldwide Research and Development, Groton, Connecticut 06340, United States
| | - Edward C Sherer
- Analytical Research & Development, Merck & Company Inc., Rahway, New Jersey 07065, United States
| | - James K Harper
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Gary E Martin
- Department of Chemistry, Seton Hall University, South Orange, New Jersey 07079, United States
| | - R Thomas Williamson
- Department of Chemistry & Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina 28409, United States
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10
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Lesot P, Gil RR, Berdagué P, Navarro-Vázquez A. Deuterium Residual Quadrupolar Couplings: Crossing the Current Frontiers in the Relative Configuration Analysis of Natural Products. JOURNAL OF NATURAL PRODUCTS 2020; 83:3141-3148. [PMID: 32970418 DOI: 10.1021/acs.jnatprod.0c00745] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The determination of the 3D structure (configuration and preferred conformation) of complex natural and synthetic organic molecules is a long-standing but still challenging task for chemists, with various implications in pharmaceutical sciences whether or not these substances have specific bioactivities. Nuclear magnetic resonance (NMR) in aligning media, either lyotropic liquid crystals (LLCs) or polymer gels, in combination with molecular modeling is a unique framework for solving complex structural problems whose analytical wealth lies in the establishment of nonlocal structural correlations. As an alternative to the already well-established anisotropic NMR parameters, such as RDCs (residual dipolar couplings) and RCSAs (residual chemical shift anisotropies), it is shown here that deuterium residual quadrupolar couplings (2H-RQCs) can be extracted from 2H 2D-NMR spectra recorded at the natural abundance level in samples oriented in a homopolypeptide LLCs (poly-γ-benzyl-l-glutamate (PBLG)). These 2H-RQCs were successfully used to address nontrivial structural problems in organic molecules. The performance and scope of this new tool is examined for two natural chiral compounds of pharmaceutical interest (strychnine and artemisinin). This is the first report in which the 3D structure/relative configuration of complex bioactive molecules is unambiguously determined using only 2H-RQCs, which, in this case, are at 2H natural abundance.
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Affiliation(s)
- Philippe Lesot
- Université Paris-Saclay, UFR d'Orsay, RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Bât. 410, 15 rue du Doyen, Georges Poitou, F-91405 Orsay, France
- Centre National de la Recherche Scientifique (CNRS), 3 rue Michel Ange, F-75016 Paris, France
| | - Roberto R Gil
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Philippe Berdagué
- Université Paris-Saclay, UFR d'Orsay, RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Bât. 410, 15 rue du Doyen, Georges Poitou, F-91405 Orsay, France
| | - Armando Navarro-Vázquez
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Cidade Universitária, CEP 50.740-540 Recife, Pernambuco, Brazil
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11
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Sinnaeve D, Ilgen J, Di Pietro ME, Primozic JJ, Schmidts V, Thiele CM, Luy B. Probing Long‐Range Anisotropic Interactions: a General and Sign‐Sensitive Strategy to Measure
1
H–
1
H Residual Dipolar Couplings as a Key Advance for Organic Structure Determination. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Davy Sinnaeve
- Univ. LilleInsermInstitut Pasteur de LilleCHU LilleU1167—Labex DISTALZ—RID-AGE—Risk Factors and Molecular Determinants of Aging-Related Diseases 59000 Lille France
- CNRS, ERL9002—Integrative Structural Biology 59000 Lille France
- Department of Organic and Macromolecular ChemistryGhent University, Campus Sterre, S4 Krijgslaan 281 9000 Ghent Belgium
| | - Julian Ilgen
- Clemens-Schöpf Institut für Organische Chemie und BiochemieTechnische Universität Darmstadt Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Maria Enrica Di Pietro
- Institute of Organic Chemistry and Institute for Biological Interfaces 4—Magnetic ResonanceKarlsruhe Institute of Technology (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Germany
- Current address: Department of ChemistryMaterials and Chemical Engineering “Giulio Natta”Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milan Italy
| | - Johann J. Primozic
- Clemens-Schöpf Institut für Organische Chemie und BiochemieTechnische Universität Darmstadt Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Volker Schmidts
- Clemens-Schöpf Institut für Organische Chemie und BiochemieTechnische Universität Darmstadt Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Christina M. Thiele
- Clemens-Schöpf Institut für Organische Chemie und BiochemieTechnische Universität Darmstadt Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Burkhard Luy
- Institute of Organic Chemistry and Institute for Biological Interfaces 4—Magnetic ResonanceKarlsruhe Institute of Technology (KIT) Fritz-Haber-Weg 6 76131 Karlsruhe Germany
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12
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Sinnaeve D, Ilgen J, Di Pietro ME, Primozic JJ, Schmidts V, Thiele CM, Luy B. Probing Long-Range Anisotropic Interactions: a General and Sign-Sensitive Strategy to Measure 1 H- 1 H Residual Dipolar Couplings as a Key Advance for Organic Structure Determination. Angew Chem Int Ed Engl 2020; 59:5316-5320. [PMID: 31945235 DOI: 10.1002/anie.201915278] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Indexed: 11/10/2022]
Abstract
Residual dipolar couplings (RDCs) are amongst the most powerful NMR parameters for organic structure elucidation. In order to maximize their effectiveness in increasingly complex cases such as flexible compounds, a maximum of RDCs between nuclei sampling a large distribution of orientations is needed, including sign information. For this, the easily accessible one-bond 1 H-13 C RDCs alone often fall short. Long-range 1 H-1 H RDCs are both abundant and typically sample highly complementary orientations, but accessing them in a sign-sensitive way has been severely obstructed due to the overflow of 1 H-1 H couplings. Here, we present a generally applicable strategy that allows the measurement of a large number of 1 H-1 H RDCs, including their signs, which is based on a combination of an improved PSYCHEDELIC method and a new selective constant-time β-COSY experiment. The potential of 1 H-1 H RDCs to better determine molecular alignment and to discriminate between enantiomers and diastereomers is demonstrated.
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Affiliation(s)
- Davy Sinnaeve
- Univ. Lille, Inserm, Institut Pasteur de Lille, CHU Lille, U1167-Labex DISTALZ-RID-AGE-Risk Factors and Molecular Determinants of Aging-Related Diseases, 59000, Lille, France.,CNRS, ERL9002-Integrative Structural Biology, 59000, Lille, France.,Department of Organic and Macromolecular Chemistry, Ghent University, Campus Sterre, S4, Krijgslaan 281, 9000, Ghent, Belgium
| | - Julian Ilgen
- Clemens-Schöpf Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287, Darmstadt, Germany
| | - Maria Enrica Di Pietro
- Institute of Organic Chemistry and Institute for Biological Interfaces 4-Magnetic Resonance, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany.,Current address: Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy
| | - Johann J Primozic
- Clemens-Schöpf Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287, Darmstadt, Germany
| | - Volker Schmidts
- Clemens-Schöpf Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287, Darmstadt, Germany
| | - Christina M Thiele
- Clemens-Schöpf Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 4, 64287, Darmstadt, Germany
| | - Burkhard Luy
- Institute of Organic Chemistry and Institute for Biological Interfaces 4-Magnetic Resonance, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
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13
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Han WB, Wang GY, Tang JJ, Wang WJ, Liu H, Gil RR, Navarro-Vázquez A, Lei X, Gao JM. Herpotrichones A and B, Two Intermolecular [4 + 2] Adducts with Anti-Neuroinflammatory Activity from a Herpotrichia Species. Org Lett 2019; 22:405-409. [DOI: 10.1021/acs.orglett.9b04099] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wen-Bo Han
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Guang-Yi Wang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Jiang-Jiang Tang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Wen-Ji Wang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Han Liu
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, Hubei 430074, People’s Republic of China
| | - Roberto R. Gil
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Armando Navarro-Vázquez
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Avenida Professor Moraes Rego, 1235, Cidade Universitária, Recife, Pernambuco 50670-901, Brazil
| | - Xinxiang Lei
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, Hubei 430074, People’s Republic of China
| | - Jin-Ming Gao
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
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14
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Ndukwe IE, Brunskill A, Gauthier DR, Zhong YL, Martin GE, Williamson RT, Reibarkh M, Liu Y. 13C NMR-Based Approaches for Solving Challenging Stereochemical Problems. Org Lett 2019; 21:4072-4076. [PMID: 31117703 DOI: 10.1021/acs.orglett.9b01248] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Determining the configuration of proton-deficient molecules is challenging using conventional NMR methods including nuclear Overhauser effect (NOE) and the proton-dependent J-based configuration analysis (JBCA). The problem is exacerbated when only one stereoisomer is available. Alternative methods based on the utilization of 13C NMR chemical shifts, 13C-13C homonuclear couplings measured at natural abundance, and residual chemical shift anisotropy measurements in conjunction with density functional theory calculations are illustrated with a proton-deficient model compound.
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Affiliation(s)
- Ikenna E Ndukwe
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - Andrew Brunskill
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - Donald R Gauthier
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - Yong-Li Zhong
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - Gary E Martin
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - R Thomas Williamson
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - Mikhail Reibarkh
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
| | - Yizhou Liu
- Analytical Research & Development , Merck & Co. Inc. , Rahway , New Jersey 07065 , United States
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15
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Ndukwe IE, Wang X, Pelczer I, Reibarkh M, Williamson RT, Liu Y, Martin GE. PBLG as a versatile liquid crystalline medium for anisotropic NMR data acquisition. Chem Commun (Camb) 2019; 55:4327-4330. [DOI: 10.1039/c9cc01130g] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The chiral nematic phase of poly-γ-benzyl-l-glutamate (PBLG) formed in a chloroform–DMSO co-solvent system can be used as a versatile alignment medium for the acquisition of high quality anisotropic NMR data for molecules of varying polarities.
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Affiliation(s)
- Ikenna E. Ndukwe
- Analytical Research and Development (Rahway)
- Merck & Co. Inc
- Kenilworth
- USA
| | - Xiao Wang
- Analytical Research and Development (Rahway)
- Merck & Co. Inc
- Kenilworth
- USA
| | | | - Mikhail Reibarkh
- Analytical Research and Development (Rahway)
- Merck & Co. Inc
- Kenilworth
- USA
| | | | - Yizhou Liu
- Analytical Research and Development (Rahway)
- Merck & Co. Inc
- Kenilworth
- USA
| | - Gary E. Martin
- Analytical Research and Development (Rahway)
- Merck & Co. Inc
- Kenilworth
- USA
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16
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Application of anisotropic NMR parameters to the confirmation of molecular structure. Nat Protoc 2018; 14:217-247. [DOI: 10.1038/s41596-018-0091-9] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Marcó N, Gil RR, Parella T. Isotropic/Anisotropic NMR Editing by Resolution-Enhanced NMR Spectroscopy. Chemphyschem 2018; 19:1024-1029. [PMID: 29384256 DOI: 10.1002/cphc.201800094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Indexed: 11/11/2022]
Abstract
Modern resolution-enhanced NMR techniques can monitor the in situ discrimination of co-existing isotropic and anisotropic contributions of small molecules dissolved in weakly aligning PMMA/CDCl3 media. The simultaneous sign-sensitive determination of accurate Δδiso-aniso (1 H), Δδiso-aniso (13 C) and/or isotropic 1 JCH and anisotropic 1 TCH coupling constants (and consequently 1 H-13 C residual dipolar couplings and 1 H/13 C residual chemical shift anisotropies) can be performed from spectral-aliased heteronuclear single-quantum correlation spectra.
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Affiliation(s)
- Núria Marcó
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, 08193, Bellaterra, Catalonia, Spain
| | - Roberto R Gil
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, 15213, PA, USA
| | - Teodor Parella
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, 08193, Bellaterra, Catalonia, Spain
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18
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Parella T. Current developments in homonuclear and heteronuclear J-resolved NMR experiments. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:230-250. [PMID: 29314247 DOI: 10.1002/mrc.4706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 12/12/2017] [Accepted: 12/12/2017] [Indexed: 06/07/2023]
Abstract
Two-dimensional J-resolved (Jres) NMR experiments offer a simple, user-friendly spectral representation where the information of coupling constants and chemical shifts are separated into two orthogonal frequency axis. Since its initial proposal 40 years ago, Jres has been the focus of considerable interest both in improving the basic pulse sequence and in its successful application to a wide range of studies. Here, the latest developments in the design of novel Jres pulse schemes are reviewed, mainly focusing on obtaining pure absorption lineshapes, minimizing strong coupling artifacts, and also optimizing sensitivity and experimental measurements. A discussion of several Jres versions for the accurate measurement of a different number of homonuclear (JHH ) and heteronuclear (JCH ) coupling constants is presented, accompanied by some illustrative examples.
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Affiliation(s)
- Teodor Parella
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Catalonia, Spain
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19
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Liu Y, Saurí J, Mevers E, Peczuh MW, Hiemstra H, Clardy J, Martin GE, Williamson RT. Unequivocal determination of complex molecular structures using anisotropic NMR measurements. Science 2017; 356:356/6333/eaam5349. [PMID: 28385960 DOI: 10.1126/science.aam5349] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 02/16/2017] [Indexed: 11/02/2022]
Abstract
Assignment of complex molecular structures from nuclear magnetic resonance (NMR) data can be prone to interpretational mistakes. Residual dipolar couplings and residual chemical shift anisotropy provide a spatial view of the relative orientations between bonds and chemical shielding tensors, respectively, regardless of separation. Consequently, these data constitute a reliable reporter of global structural validity. Anisotropic NMR parameters can be used to evaluate investigators' structure proposals or structures generated by computer-assisted structure elucidation. Application of the method to several complex structure assignment problems shows promising results that signal a potential paradigm shift from conventional NMR data interpretation, which may be of particular utility for compounds not amenable to x-ray crystallography.
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Affiliation(s)
- Yizhou Liu
- Structure Elucidation Group, Process and Analytical Research and Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, USA
| | - Josep Saurí
- Structure Elucidation Group, Process and Analytical Research and Development, Merck & Co., Inc., 33 Avenue Louis Pasteur, Boston, MA 02115, USA
| | - Emily Mevers
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
| | - Mark W Peczuh
- Department of Chemistry, University of Connecticut, 55 North Eagleville Road, Unit 3060, Storrs, CT 06269, USA
| | - Henk Hiemstra
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
| | - Jon Clardy
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
| | - Gary E Martin
- Structure Elucidation Group, Process and Analytical Research and Development, Merck & Co., Inc., 126 East Lincoln Avenue, Rahway, NJ 07065, USA.
| | - R Thomas Williamson
- Structure Elucidation Group, Process and Analytical Research and Development, Merck & Co., Inc., 126 East Lincoln Avenue, Rahway, NJ 07065, USA.
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20
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Cornilescu G, Ramos Alvarenga RF, Wyche TP, Bugni TS, Gil RR, Cornilescu CC, Westler WM, Markley JL, Schwieters CD. Progressive Stereo Locking (PSL): A Residual Dipolar Coupling Based Force Field Method for Determining the Relative Configuration of Natural Products and Other Small Molecules. ACS Chem Biol 2017; 12:2157-2163. [PMID: 28617580 DOI: 10.1021/acschembio.7b00281] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Establishing the relative configuration of a bioactive natural product represents the most challenging part in determining its structure. Residual dipolar couplings (RDCs) are sensitive probes of the relative spatial orientation of internuclear vectors. We adapted a force field structure calculation methodology to allow free sampling of both R and S configurations of the stereocenters of interest. The algorithm uses a floating alignment tensor in a simulated annealing protocol to identify the conformations and configurations that best fit experimental RDC and distance restraints (from NOE and J-coupling data). A unique configuration (for rigid molecules) or a very small number of configurations (for less rigid molecules) of the structural models having the lowest chiral angle energies and reasonable magnitudes of the alignment tensor are provided as the best predictions of the unknown configuration. For highly flexible molecules, the progressive locking of their stereocenters into their statistically dominant R or S state dramatically reduces the number of possible relative configurations. The result is verified by checking that the same configuration is obtained by initiating the locking from different regions of the molecule. For all molecules tested having known configurations (with conformations ranging from mostly rigid to highly flexible), the method accurately determined the correct configuration.
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Affiliation(s)
| | - René F. Ramos Alvarenga
- Pharmaceutical
Sciences Division, School of Pharmacy, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
| | - Thomas P. Wyche
- Pharmaceutical
Sciences Division, School of Pharmacy, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
- Biological
Chemistry and Molecular Pharmacology Department, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Tim S. Bugni
- Pharmaceutical
Sciences Division, School of Pharmacy, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
| | - Roberto R. Gil
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | | | | | | | - Charles D. Schwieters
- Center for
Information Technology, National Institutes of Health, Bethesda, Maryland 20892-5624, United States
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21
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Marcó N, Gil RR, Parella T. Structural discrimination from in situ measurement of 1 D CH and 2 D HH residual dipolar coupling constants. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2017; 55:540-545. [PMID: 28043096 DOI: 10.1002/mrc.4575] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 12/23/2016] [Accepted: 12/29/2016] [Indexed: 06/06/2023]
Abstract
A fast residual dipolar coupling constant-assisted strategy involving the simultaneous determination of scalar and total coupling constants from a single 1 JCH /2 JHH -resolved NMR spectrum is reported. It is shown that the concerted use of the directly measured 1 DCH (for all CHn multiplicities) and 2 DHH residual dipolar couplings allows an on-the-fly assignment of diastereotopic CH2 protons, as well as of an efficient discrimination between diastereoisomeric structures of strychnine which contains six stereocenters. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Núria Marcó
- Servei de Ressonància Magnètica Nuclear and Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - Roberto R Gil
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, PA, 15213, USA
| | - Teodor Parella
- Servei de Ressonància Magnètica Nuclear and Departament de Química, Facultat de Ciències, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
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22
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Navarro-Vázquez A, Berdagué P, Lesot P. Integrated Computational Protocol for the Analysis of Quadrupolar Splittings from Natural-Abundance Deuterium NMR Spectra in (Chiral) Oriented Media. Chemphyschem 2017; 18:1252-1266. [DOI: 10.1002/cphc.201601423] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Armando Navarro-Vázquez
- Departamento de Química Fundamental; Universidade Federal de Pernambuco Cidade Universitária; CEP: 50 740-540 Recife PE Brazil
- Institute of Organic Chemistry and Institute for Biological Interfaces; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe German
| | - Philippe Berdagué
- RMN en Milieu Orienté; ICMMO; UMR CNRS 8182; Université Paris-Sud/Université Paris-Saclay; Bât. 410 91405 Orsay cedex France
| | - Philippe Lesot
- RMN en Milieu Orienté; ICMMO; UMR CNRS 8182; Université Paris-Sud/Université Paris-Saclay; Bât. 410 91405 Orsay cedex France
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23
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Marcó N, Souza AA, Nolis P, Gil RR, Parella T. Perfect 1J CH-resolved HSQC: Efficient measurement of one-bond proton-carbon coupling constants along the indirect dimension. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2017; 276:37-42. [PMID: 28092787 DOI: 10.1016/j.jmr.2017.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 12/30/2016] [Accepted: 01/01/2017] [Indexed: 06/06/2023]
Abstract
A versatile 1JCH-resolved HSQC pulse scheme for the speedy, accurate and automated determination of one-bond proton-carbon coupling constants is reported. The implementation of a perfectBIRD element allows a straightforward measurement from the clean doublets obtained along the highly resolved F1 dimension, even for each individual 1JCHa and 1JCHb in diastereotopic HaCHb methylene groups. Real-time homodecoupling during acquisition and other alternatives to minimize accidental signal overlapping in overcrowded spectra are also discussed.
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Affiliation(s)
- N Marcó
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - A A Souza
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain; Departamento de Química, Universidade Federal do Piauí, 64049-550 Teresina, PI, Brazil
| | - P Nolis
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - R R Gil
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, USA
| | - T Parella
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain.
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24
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Troche‐Pesqueira E, Anklin C, Gil RR, Navarro‐Vázquez A. Computer‐Assisted 3D Structure Elucidation of Natural Products using Residual Dipolar Couplings. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612454] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Clemens Anklin
- Bruker BioSpin Corp. 15 Fortune Dr. Billerica MA 01821 USA
| | - Roberto R. Gil
- Department of Chemistry Carnegie Mellon University 4400 Fifth Ave Pittsburgh PA 15213 USA
| | - Armando Navarro‐Vázquez
- Departamento de Química Fundamental, CCEN Universidade Federal de Pernambuco Brazil
- Departamento de Química Orgánica Universidade de Vigo 36310 Vigo Spain
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25
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Troche‐Pesqueira E, Anklin C, Gil RR, Navarro‐Vázquez A. Computer‐Assisted 3D Structure Elucidation of Natural Products using Residual Dipolar Couplings. Angew Chem Int Ed Engl 2017; 56:3660-3664. [DOI: 10.1002/anie.201612454] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Indexed: 11/06/2022]
Affiliation(s)
| | - Clemens Anklin
- Bruker BioSpin Corp. 15 Fortune Dr. Billerica MA 01821 USA
| | - Roberto R. Gil
- Department of Chemistry Carnegie Mellon University 4400 Fifth Ave Pittsburgh PA 15213 USA
| | - Armando Navarro‐Vázquez
- Departamento de Química Fundamental, CCEN Universidade Federal de Pernambuco Brazil
- Departamento de Química Orgánica Universidade de Vigo 36310 Vigo Spain
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26
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Schmidts V. Perspectives in the application of residual dipolar couplings in the structure elucidation of weakly aligned small molecules. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2017; 55:54-60. [PMID: 27743456 DOI: 10.1002/mrc.4543] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 10/10/2016] [Accepted: 10/13/2016] [Indexed: 05/28/2023]
Abstract
This perspective article aims to review the general methodology in the application of residual dipolar couplings (RDCs) in the structure elucidation of small molecules and give the author's view on challenges for future applications. Recent improvements in the availability of alignment media, new pulse sequences for the measurement of couplings and improvements in the analysis software have garnered widespread interest in the technique. However, further generalization is needed in order to make RDC analysis into a truly "routine" method. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Volker Schmidts
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Darmstadt, Germany
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27
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Castañar L, Garcia M, Hellemann E, Nolis P, Gil RR, Parella T. One-Shot Determination of Residual Dipolar Couplings: Application to the Structural Discrimination of Small Molecules Containing Multiple Stereocenters. J Org Chem 2016; 81:11126-11131. [DOI: 10.1021/acs.joc.6b02103] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Laura Castañar
- Servei
de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - Manuela Garcia
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Erich Hellemann
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Pau Nolis
- Servei
de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - Roberto R. Gil
- Department
of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Teodor Parella
- Servei
de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
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28
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Al‐Massaedh “AA, Schmidt M, Pyell U, Reinscheid UM. Elucidation of the Enantiodiscrimination Properties of a Nonracemic Chiral Alignment Medium through Gel-based Capillary Electrochromatography: Separation of the Mefloquine Stereoisomers. ChemistryOpen 2016; 5:455-459. [PMID: 27777838 PMCID: PMC5062011 DOI: 10.1002/open.201600085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Indexed: 11/07/2022] Open
Abstract
Enantiodiscrimination and enantioseparation are two highly important processes in chemistry, often performed by using NMR spectroscopy and chromatography. For a better understanding of the mechanistic details, the same system should be studied by both methods. In addition, isotropic and anisotropic NMR parameters should be obtained, the latter using alignment media so that residual dipolar couplings and chemical-shift anisotropies can be measured. Consequently, a chiral alignment medium was used for the first time in chiral gel-based capillary electrochromatography with the four stereoisomers of the antimalaria drug mefloquine as test compounds. Chromatographic data verify that enantiodiscrimination obtained with this alignment gel is caused by differences in the equilibrium constants related to associate formation. Hence, the chromatographic separation provides physicochemical data that form a basis for the understanding and optimization of alignment processes, and vice versa.
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Affiliation(s)
- “Ayat Allah” Al‐Massaedh
- Department of ChemistryUniversity of MarburgHans-Meerwein-Straße35032MarburgGermany
- Department of ChemistryFaculty of ScienceAl al-Bayt University25113MafraqJordan
| | - Manuel Schmidt
- Department of NMR-based Structural BiologyMax-Planck-Institute for Biophysical ChemistryAm Fassberg 1137077GöttingenGermany
| | - Ute Pyell
- Department of ChemistryUniversity of MarburgHans-Meerwein-Straße35032MarburgGermany
| | - Uwe M. Reinscheid
- Department of NMR-based Structural BiologyMax-Planck-Institute for Biophysical ChemistryAm Fassberg 1137077GöttingenGermany
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29
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Nath N, Schmidt M, Gil RR, Williamson RT, Martin GE, Navarro-Vázquez A, Griesinger C, Liu Y. Determination of Relative Configuration from Residual Chemical Shift Anisotropy. J Am Chem Soc 2016; 138:9548-56. [DOI: 10.1021/jacs.6b04082] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nilamoni Nath
- Department
of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Manuel Schmidt
- Department
of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Roberto R. Gil
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - R. Thomas Williamson
- Process Research and Development, NMR Structure Elucidation Group, Merck & Co., Inc., 126 E Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Gary E. Martin
- Process Research and Development, NMR Structure Elucidation Group, Merck & Co., Inc., 126 E Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Armando Navarro-Vázquez
- Departamento
de Química Fundamental, Universidade Federal de Pernambuco, Cidade Universitária, Recife, PE 50740-560, Brazil
- Institute
of Organic Chemistry and Institute for Biological Interfaces Karlsruhe, Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Christian Griesinger
- Department
of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
| | - Yizhou Liu
- Process Research and Development, NMR Structure Elucidation Group, Merck & Co., Inc., 126 E Lincoln Avenue, Rahway, New Jersey 07065, United States
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