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Dai Y, Terskikh V, Wu G. A combined solid-state 1H, 13C, 17O NMR and periodic DFT study of hyperfine coupling tensors in paramagnetic copper(II) compounds. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2024; 132:101945. [PMID: 38968703 DOI: 10.1016/j.ssnmr.2024.101945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 06/21/2024] [Accepted: 06/24/2024] [Indexed: 07/07/2024]
Abstract
We report solid-state 1H, 13C, and 17O NMR determination of hyperfine coupling tensors (A-tensors) in several paramagnetic Cu(II) (d9, S = 1/2) complexes: trans-Cu(DL-Ala)2·H217O, Cu([1-13C]acetate)2·H2O, Cu([2-13C]acetate)2·H2O, and Cu(acetate)2·H217O. Using these new experimental results and some A-tensor data available in the literature for trans-Cu(L-Ala)2 and K2CuCl4·2H2O, we were able to examine the accuracy of A-tensor computation from a periodic DFT method implemented in the BAND program. We evaluated A-tensors on 1H (I = 1/2), 13C (I = 1/2), 14N (I = 1), 17O (I = 5/2), 39K (I = 3/2), 35Cl (I = 3/2), and 63Cu (I = 3/2) nuclei over a range spanning more than 3 orders of magnitude. We found that the BAND code can reproduce reasonably well the experimental results for both A-tensors and nuclear quadrupole coupling tensors.
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Affiliation(s)
- Yizhe Dai
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, K7L 3N6, Canada
| | - Victor Terskikh
- Metrology, National Research Council Canada, Ottawa, K1A 0R6, Canada
| | - Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, K7L 3N6, Canada.
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2
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Ramek M, Sabolović J. Structure prediction of physiological bis(amino acidato)copper(II) species in aqueous solution: The copper(II) compounds with l-glutamine and l-histidine. J Inorg Biochem 2024; 251:112430. [PMID: 38006660 DOI: 10.1016/j.jinorgbio.2023.112430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 10/27/2023] [Accepted: 11/13/2023] [Indexed: 11/27/2023]
Abstract
Neutral (l-histidinato)(l-glutaminato)copper(II) [Cu(His)(Gln)] has been established as the most abundant ternary copper(II) amino acid compound of the exchangeable copper(II) pool in blood plasma. The experimental studies of Cu(His)(Gln) and bis(glutaminato)copper(II) [Cu(Gln)2] in solutions did not specify their complete geometries. To determine the geometries, this paper investigates the conformers, energy landscapes, and a structure-magnetic parameters relation of Cu(Gln)2 and Cu(His)(Gln) by the density functional theory (DFT) calculations. We assume a glycine-like coordination of Gln (other coordination patterns are dismissed because of steric reasons), and three His in-plane copper(II) binding modes. The conformational analyses are performed in the gas phase and implicitly modeled aqueous solution. The reliability of the DFT relative electronic and Gibbs free energies of the Cu(His)(Gln) conformers is confirmed by benchmarking against the corresponding energies obtained by the domain-based local pair natural orbital coupled-cluster method with singles, doubles, and perturbative triples [DLPNO-CCSD(T)]. Several cis- and trans-Cu(His)(Gln) conformers with His in the histaminate-like and glycine-like modes have low Gibbs free energies, and the greatest estimated metal-binding affinities. The DFT-calculated magnetic parameters of the low-energy conformers reproduce best the experimental electron paramagnetic resonance parameters measured in aqueous solutions for trans- and cis-Cu(Gln)2 conformers having two oxygen atoms (either from Gln or water molecules) at the apical positions, and Cu(His)(Gln) conformers having His in the histaminate-like mode with an apically placed carboxylato oxygen atom. The predicted conformational flexibility of His‑copper(II)-amino acid compounds may be connected with their physiological abundance, and the role in copper(II) exchange reactions in blood plasma.
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Affiliation(s)
- Michael Ramek
- Institute of Physical and Theoretical Chemistry, Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria
| | - Jasmina Sabolović
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, HR-10000 Zagreb, Croatia.
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3
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De S, Flambard A, Xu B, Chamoreau L, Gontard G, Lisnard L, Li Y, Boillot M, Lescouëzec R. Molecular Magnetic Materials Based on {Co
III
(Tp*)(CN)
3
}
−
Cyanidometallate: Combined Magnetic, Structural and
59
Co NMR Study. Chemistry 2022; 28:e202200783. [PMID: 35716039 PMCID: PMC9543823 DOI: 10.1002/chem.202200783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Indexed: 11/09/2022]
Abstract
The cyanidocobaltate of formula fac‐PPh4[CoIII(Me2Tp)(CN)3] ⋅ CH3CN (1) has been used as a metalloligand to prepare polynuclear magnetic complexes (Me2Tp=hydrotris(3,5‐dimethylpyrazol‐1‐yl)borate). The association of 1 with in situ prepared [FeII(bik)2(MeCN)2](OTf)2 (bik=bis(1‐methylimidazol‐2‐yl)ketone) leads to a molecular square of formula {[CoIII{(Me2Tp)}(CN)3]2[FeII(bik)2]2}(OTf)2 ⋅ 4MeCN ⋅ 2H2O (2), whereas the self‐assembly of 1 with preformed cluster [CoII2(OH2)(piv)4(Hpiv)4] in MeCN leads to the two‐dimensional network of formula {[CoII2(piv)3]2[CoIII(Me2Tp)(CN)3]2 ⋅ 2CH3CN}∞ (3). These compounds were structurally characterized via single crystal X‐ray analysis and their spectroscopic (FTIR, UV‐Vis and 59Co NMR) properties and magnetic behaviours were also investigated. Bulk magnetic susceptibility measurements reveal that 1 is diamagnetic and 3 is paramagnetic throughout the explored temperature range, whereas 2 exhibits sharp spin transition centered at ca. 292 K. Compound 2 also exhibits photomagnetic effects at low temperature, selective light irradiations allowing to promote reversibly and repeatedly low‐spin⇔high‐spin conversion. Besides, the diamagnetic nature of the Co(III) building block allows us studying these compounds by means of 59Co NMR spectroscopy. Herein, a 59Co chemical shift has been used as a magnetic probe to corroborate experimental magnetic data obtained from bulk magnetic susceptibility measurements. An influence of the magnetic state of the neighbouring atoms is observed on the 59Co NMR signals. Moreover, for the very first time, 59Co NMR technique has been successfully introduced to investigate molecular materials with distinct magnetic properties.
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Affiliation(s)
- Siddhartha De
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Alexandrine Flambard
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Buqin Xu
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Lise‐Marie Chamoreau
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Geoffrey Gontard
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Laurent Lisnard
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Yanling Li
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
| | - Marie‐Laure Boillot
- Institut Chimie Moléculaire et Matériaux d'Orsay UMR CNRS 8182 Université Paris-Saclay, CNRS 91405 Orsay France
| | - Rodrigue Lescouëzec
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232 Sorbonne Université, CNRS 75005 Paris France
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4
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Dasgupta R, Gupta KBSS, Elam D, Ubbink M, de Groot HJM. Dipolar dephasing for structure determination in a paramagnetic environment. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2021; 113:101728. [PMID: 33744671 DOI: 10.1016/j.ssnmr.2021.101728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/26/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
We demonstrate the efficacy of the REDOR-type sequences in determining dipolar coupling strength in a paramagnetic environment. Utilizing paramagnetic effects of enhanced relaxation rates and rapid electronic fluctuations in Cu(II)-(DL-Ala)2.H2O, the dipolar coupling for the methyl C-H that is 4.20 Å (methyl carbon) away from the Cu2+ ion, was estimated to be 8.8 ± 0.6 kHz. This coupling is scaled by a factor of ~0.3 in comparison to the rigid limit value of ~32 kHz, in line with partial averaging of the dipolar interaction by rotational motion of the methyl group. Limited variation in the scaling factor of the dipolar coupling strength at different temperatures is observed. The C-H internuclear distance derived from the size of the dipolar coupling is similar to that observed in the crystal structure. The errors in the dipolar coupling strength observed in the REDOR-type experiments are similar to those reported for diamagnetic systems. Increase in resolution due to the Fermi contact shifts, coupled with MAS frequencies of 30-35 kHz allowed to estimate the hyperfine coupling strengths for protons and carbons from the temperature dependence of the chemical shift and obtain a high resolution 1H-1H spin diffusion spectrum. This study shows the utility of REDOR-type sequences in obtaining reliable structural and dynamical information from a paramagnetic complex. We believe that this can help in studying the active site of paramagnetic metalloproteins at high resolution.
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Affiliation(s)
- Rubin Dasgupta
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, the Netherlands
| | - Karthick B S S Gupta
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, the Netherlands
| | - Derek Elam
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, the Netherlands
| | - Marcellus Ubbink
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, the Netherlands
| | - Huub J M de Groot
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, the Netherlands.
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5
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In vitro biological evaluation and consideration about structure-activity relationship of silver(I) aminoacidate complexes. J Inorg Biochem 2020; 210:111170. [PMID: 32652262 DOI: 10.1016/j.jinorgbio.2020.111170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 06/11/2020] [Accepted: 06/24/2020] [Indexed: 01/07/2023]
Abstract
Two silver(I) aminoacidate complexes {[Ag4(L-HAla)4(NO3)3]NO3}n (AgAla, complex 1, Ala = alanine) and {[Ag(L-Phe)]}n (AgPhe, complex 2, Phe = phenylalanine) were prepared and characterized by elemental, spectral analysis (FT-IR, NMR techniques) and single crystal X-ray analysis in solid state and their solution stability was measured in biological testing time-scale by 1H NMR. The bridging coordination modes of the zwitterionic Ala and deprotonated Phe ligands led to the formation of 1D polymeric chains of the complexes. The significant argentophilic interactions are presented in the structure of AgAla. Antimicrobial testing of prepared Ag(I) complexes was evaluated by IC50 and MIC values and were compared with AgGly, silver(I) sulfadiazine and AgNO3 samples. Moreover, MTS test was used to the testing of broad range antiproliferative activity of studied compounds against different cancer cell lines and also to the investigation of calf thymus DNA interactions by absorption spectroscopy, fluorescence spectroscopy, Ethidium bromide/Hoechst 33258 displacement experiments and circular dichroism spectroscopy. To evaluate the pUC19 DNA fragmentation by silver(I) complexes, the agarose gel electrophoresis was used. In addition to biological evaluation we used lipophilicity measurement results in the discussion about structure-activity relationship (SAR).
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6
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Vušak D, Pejić J, Jurković M, Szalontai G, Sabolović J. Coordination polymers of paramagnetic bis(leucinato)copper( ii) diastereomers: experimental and computational study of the stereoisomerism and conformations. CrystEngComm 2020. [DOI: 10.1039/d0ce00585a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses, X-ray diffraction, solid state NMR and molecular modeling determined (dis)similarities between the coordination polymers of two bis(leucinato)copper(ii) diastereomers.
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Affiliation(s)
- Darko Vušak
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- HR-10000 Zagreb
- Croatia
| | - Jelena Pejić
- Institute for Medical Research and Occupational Health
- HR-10000 Zagreb
- Croatia
| | - Mia Jurković
- Department of Chemistry
- Faculty of Science
- University of Zagreb
- HR-10000 Zagreb
- Croatia
| | - Gábor Szalontai
- NMR Laboratory
- Institute of Chemistry
- Faculty of Engineering
- University of Pannonia
- H-8201 Veszprém
| | - Jasmina Sabolović
- Institute for Medical Research and Occupational Health
- HR-10000 Zagreb
- Croatia
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7
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Szalontai G, Csonka R, Kaizer J, Bombicz P, Sabolović J. 2 H magic-angle spinning NMR and powder diffraction study of deuterated paramagnetic copper(II) glycinato complexes. Information on crystallographic symmetries, stereo-isomerism, and molecular mobility available from ssNMR spectra. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.05.071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Sabolović J, Ramek M, Marković M. Calculating the geometry and Raman spectrum of physiological bis(l-histidinato)copper(II): an assessment of DFT functionals for aqueous and isolated systems. J Mol Model 2017; 23:290. [DOI: 10.1007/s00894-017-3448-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 08/28/2017] [Indexed: 11/24/2022]
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9
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Bertmer M. Paramagnetic solid-state NMR of materials. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 81:1-7. [PMID: 27918930 DOI: 10.1016/j.ssnmr.2016.10.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 10/26/2016] [Accepted: 10/27/2016] [Indexed: 06/06/2023]
Abstract
Solid-state NMR (SSNMR) experiments are mainly performed on diamagnetic materials. However, the study of paramagnetic materials offers access to additional information in combination with the unpaired electron. This article discusses the experimental complications arising when considering paramagnetic materials such as large shift effects and large linewidths. A look at the theoretical description as well as experimental methods are shown and accompanied by techniques for signal assignment, also with the help of quantum-chemical calculations.
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Affiliation(s)
- Marko Bertmer
- Leipzig University, Experimental Physics II, Linnéstr. 5, Leipzig 04103, Germany
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10
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Dawson DM, Ke Z, Mack FM, Doyle RA, Bignami GPM, Smellie IA, Bühl M, Ashbrook SE. Calculation and experimental measurement of paramagnetic NMR parameters of phenolic oximate Cu(ii) complexes. Chem Commun (Camb) 2017; 53:10512-10515. [DOI: 10.1039/c7cc05098d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Unusual 1H and 13C NMR shifts for paramagnetic bisoximato copper(ii) complexes are understood by combining DFT calculations and multidimensional experiments.
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Affiliation(s)
- Daniel M. Dawson
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Zhipeng Ke
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Frederick M. Mack
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Rachel A. Doyle
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Giulia P. M. Bignami
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Iain A. Smellie
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Michael Bühl
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
| | - Sharon E. Ashbrook
- School of Chemistry
- EaStCHEM and Centre of Magnetic Resonance
- University of St Andrews
- St Andrews
- UK
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11
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Szalontai G, Csonka R, Speier G, Kaizer J, Sabolović J. Solid-State NMR Study of Paramagnetic Bis(alaninato-κ2N,O)copper(II) and Bis(1-amino(cyclo)alkane-1-carboxylato-κ2N,O)copper(II) Complexes: Reflection of Stereoisomerism and Molecular Mobility in 13C and 2H Fast Magic Angle Spinning Spectra. Inorg Chem 2015; 54:4663-77. [DOI: 10.1021/ic502987e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Gábor Szalontai
- Department of Chemistry, Faculty of Engineering, University of Pannonia, Egyetem utca 10, H-8201 Veszprém, Hungary
| | - Róbert Csonka
- Department of Chemistry, Faculty of Engineering, University of Pannonia, Egyetem utca 10, H-8201 Veszprém, Hungary
| | - Gábor Speier
- Department of Chemistry, Faculty of Engineering, University of Pannonia, Egyetem utca 10, H-8201 Veszprém, Hungary
| | - József Kaizer
- Department of Chemistry, Faculty of Engineering, University of Pannonia, Egyetem utca 10, H-8201 Veszprém, Hungary
| | - Jasmina Sabolović
- Institute for Medical Research and Occupational Health, Ksaverska cesta 2, P.O. Box 291,
HR-10001 Zagreb, Croatia
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12
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Kong X, Terskikh VV, Khade RL, Yang L, Rorick A, Zhang Y, He P, Huang Y, Wu G. Solid-state ¹⁷O NMR spectroscopy of paramagnetic coordination compounds. Angew Chem Int Ed Engl 2015; 54:4753-7. [PMID: 25694203 PMCID: PMC4418630 DOI: 10.1002/anie.201409888] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Indexed: 11/09/2022]
Abstract
High-quality solid-state (17)O (I=5/2) NMR spectra can be successfully obtained for paramagnetic coordination compounds in which oxygen atoms are directly bonded to the paramagnetic metal centers. For complexes containing V(III) (S=1), Cu(II) (S=1/2), and Mn(III) (S=2) metal centers, the (17)O isotropic paramagnetic shifts were found to span a range of more than 10,000 ppm. In several cases, high-resolution (17)O NMR spectra were recorded under very fast magic-angle spinning (MAS) conditions at 21.1 T. Quantum-chemical computations using density functional theory (DFT) qualitatively reproduced the experimental (17)O hyperfine shift tensors.
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Affiliation(s)
- Xianqi Kong
- Department of Chemistry, Queen's University Kingston, Ontario, K7L 3N6 (Canada)
| | - Victor V. Terskikh
- Department of Chemistry, University of Ottawa Ottawa, Ontario, K1N 6N5 (Canada)
| | - Rahul L. Khade
- Department of Chemistry, Chemical Biology, and Biomedical Engineering, Stevens Institute of Technology Castle Point on Hudson, Hoboken, New Jersey 07030 (USA)
| | - Liu Yang
- Department of Chemistry, Chemical Biology, and Biomedical Engineering, Stevens Institute of Technology Castle Point on Hudson, Hoboken, New Jersey 07030 (USA)
| | - Amber Rorick
- Department of Chemistry, Chemical Biology, and Biomedical Engineering, Stevens Institute of Technology Castle Point on Hudson, Hoboken, New Jersey 07030 (USA)
| | - Yong Zhang
- Department of Chemistry, Chemical Biology, and Biomedical Engineering, Stevens Institute of Technology Castle Point on Hudson, Hoboken, New Jersey 07030 (USA)
| | - Peng He
- Department of Chemistry, University of Western Ontario London, Ontario, N6A 5B7 (Canada)
| | - Yining Huang
- Department of Chemistry, University of Western Ontario London, Ontario, N6A 5B7 (Canada)
| | - Gang Wu
- Department of Chemistry, Queen's University Kingston, Ontario, K7L 3N6 (Canada)
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Jaroniec CP. Structural studies of proteins by paramagnetic solid-state NMR spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 253:50-9. [PMID: 25797004 PMCID: PMC4371136 DOI: 10.1016/j.jmr.2014.12.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 12/17/2014] [Indexed: 05/03/2023]
Abstract
Paramagnetism-based nuclear pseudocontact shifts and spin relaxation enhancements contain a wealth of information in solid-state NMR spectra about electron-nucleus distances on the ∼20 Å length scale, far beyond that normally probed through measurements of nuclear dipolar couplings. Such data are especially vital in the context of structural studies of proteins and other biological molecules that suffer from a sparse number of experimentally-accessible atomic distances constraining their three-dimensional fold or intermolecular interactions. This perspective provides a brief overview of the recent developments and applications of paramagnetic magic-angle spinning NMR to biological systems, with primary focus on the investigations of metalloproteins and natively diamagnetic proteins modified with covalent paramagnetic tags.
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Affiliation(s)
- Christopher P Jaroniec
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA.
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14
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Kong X, Terskikh VV, Khade RL, Yang L, Rorick A, Zhang Y, He P, Huang Y, Wu G. Solid-State17O NMR Spectroscopy of Paramagnetic Coordination Compounds. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201409888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Szalontai G, Sabolović J, Marković M, Szabolcs Balogh A. Solid-State NMR Characterization of Paramagnetic Bis(L-valinato)copper(II) Stereoisomers - Effect of Conformational Disorder and Molecular Mobility on13C and2H Fast Magic-Angle Spinning Spectra. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402134] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Isolation of two rare aqua-bridged zigzag copper(II) coordination polymers: Syntheses, characterization and X-ray structures of [Cu(2-bromobenzoate)2(β/γ-picoline)2(μ-H2O)]n. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.12.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Parthasarathy S, Nishiyama Y, Ishii Y. Sensitivity and resolution enhanced solid-state NMR for paramagnetic systems and biomolecules under very fast magic angle spinning. Acc Chem Res 2013; 46:2127-35. [PMID: 23889329 DOI: 10.1021/ar4000482] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recent research in fast magic angle spinning (MAS) methods has drastically improved the resolution and sensitivity of NMR spectroscopy of biomolecules and materials in solids. In this Account, we summarize recent and ongoing developments in this area by presenting (13)C and (1)H solid-state NMR (SSNMR) studies on paramagnetic systems and biomolecules under fast MAS from our laboratories. First, we describe how very fast MAS (VFMAS) at the spinning speed of at least 20 kHz allows us to overcome major difficulties in (1)H and (13)C high-resolution SSNMR of paramagnetic systems. As a result, we can enhance both sensitivity and resolution by up to a few orders of magnitude. Using fast recycling (∼ms/scan) with short (1)H T1 values, we can perform (1)H SSNMR microanalysis of paramagnetic systems on the microgram scale with greatly improved sensitivity over that observed for diamagnetic systems. Second, we discuss how VFMAS at a spinning speed greater than ∼40 kHz can enhance the sensitivity and resolution of (13)C biomolecular SSNMR measurements. Low-power (1)H decoupling schemes under VFMAS offer excellent spectral resolution for (13)C SSNMR by nominal (1)H RF irradiation at ∼10 kHz. By combining the VFMAS approach with enhanced (1)H T1 relaxation by paramagnetic doping, we can achieve extremely fast recycling in modern biomolecular SSNMR experiments. Experiments with (13)C-labeled ubiquitin doped with 10 mM Cu-EDTA demonstrate how effectively this new approach, called paramagnetic assisted condensed data collection (PACC), enhances the sensitivity. Lastly, we examine (13)C SSNMR measurements for biomolecules under faster MAS at a higher field. Our preliminary (13)C SSNMR data of Aβ amyloid fibrils and GB1 microcrystals acquired at (1)H NMR frequencies of 750-800 MHz suggest that the combined use of the PACC approach and ultrahigh fields could allow for routine multidimensional SSNMR analyses of proteins at the 50-200 nmol level. Also, we briefly discuss the prospects for studying bimolecules using (13)C SSNMR under ultrafast MAS at the spinning speed of ∼100 kHz.
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Affiliation(s)
| | - Yusuke Nishiyama
- JEOL RESONANCE Inc., 3-1-2 Musashino, Akishimashi, Tokyo 196-8558, Japan
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18
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Kozachuk O, Meilikhov M, Yusenko K, Schneemann A, Jee B, Kuttatheyil AV, Bertmer M, Sternemann C, Pöppl A, Fischer RA. A Solid-Solution Approach to Mixed-Metal Metal-Organic Frameworks - Detailed Characterization of Local Structures, Defects and Breathing Behaviour of Al/V Frameworks. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300591] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Jaroniec CP. Solid-state nuclear magnetic resonance structural studies of proteins using paramagnetic probes. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 43-44:1-13. [PMID: 22464402 DOI: 10.1016/j.ssnmr.2012.02.007] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 02/27/2012] [Accepted: 02/28/2012] [Indexed: 05/31/2023]
Abstract
Determination of three-dimensional structures of biological macromolecules by magic-angle spinning (MAS) solid-state NMR spectroscopy is hindered by the paucity of nuclear dipolar coupling-based restraints corresponding to distances exceeding 5 Å. Recent MAS NMR studies of uniformly (13)C,(15)N-enriched proteins containing paramagnetic centers have demonstrated the measurements of site-specific nuclear pseudocontact shifts and spin relaxation enhancements, which report on electron-nucleus distances up to ~20 Å. These studies pave the way for the application of such long-distance paramagnetic restraints to protein structure elucidation and analysis of protein-protein and protein-ligand interactions in the solid phase. Paramagnetic species also facilitate the rapid acquisition of high resolution and sensitivity multidimensional solid-state NMR spectra of biomacromolecules using condensed data collection schemes, and characterization of solvent-accessible surfaces of peptides and proteins. In this review we discuss some of the latest applications of magic-angle spinning NMR spectroscopy in conjunction with paramagnetic probes to the structural studies of proteins in the solid state.
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Affiliation(s)
- Christopher P Jaroniec
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA.
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Nadaud PS, Sengupta I, Helmus JJ, Jaroniec CP. Evaluation of the influence of intermolecular electron-nucleus couplings and intrinsic metal binding sites on the measurement of 15N longitudinal paramagnetic relaxation enhancements in proteins by solid-state NMR. JOURNAL OF BIOMOLECULAR NMR 2011; 51:293-302. [PMID: 21826518 DOI: 10.1007/s10858-011-9536-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Accepted: 07/25/2011] [Indexed: 05/31/2023]
Abstract
Magic-angle spinning solid-state NMR measurements of (15)N longitudinal paramagnetic relaxation enhancements (PREs) in (13)C,(15)N-labeled proteins modified with Cu(2+)-chelating tags can yield multiple long-range electron-nucleus distance restraints up to ~20 Å (Nadaud et al. in J Am Chem Soc 131:8108-8120, 2009). Using the EDTA-Cu(2+) K28C mutant of B1 immunoglobulin binding domain of protein G (GB1) as a model, we investigate the effects on such measurements of intermolecular electron-nucleus couplings and intrinsic metal binding sites, both of which may potentially complicate the interpretation of PRE data in terms of the intramolecular protein fold. To quantitatively assess the influence of intermolecular (15)N-Cu(2+) interactions we have determined a nearly complete set of longitudinal (15)N PREs for a series of microcrystalline samples containing ~10, 15 and 25 mol percent of the (13)C,(15)N-labeled EDTA-Cu(2+)-tagged protein diluted in a matrix of diamagnetic natural abundance GB1. The residual intermolecular interactions were found to be minor on the whole and account for only a fraction of the relatively small but systematic deviations observed between the experimental (15)N PREs and corresponding values calculated using protein structural models for residues furthest removed from the EDTA-Cu(2+) tag. This suggests that these deviations are also caused in part by other factors not related to the protein structure, such as the presence in the protein of intrinsic secondary sites capable of binding Cu(2+) ions. To probe this issue we performed a Cu(2+) titration study for K28C-EDTA GB1 monitored by 2D (15)N-(1)H solution-state NMR, which revealed that while for Cu(2+):protein molar ratios of ≤ 1.0 Cu(2+) binds primarily to the high-affinity EDTA tag, as anticipated, at even slightly super-stoichiometric ratios the Cu(2+) ions can also associate with side-chains of aspartate and glutamate residues. This in turn is expected to lead to enhanced PREs for residues located in the vicinity of the secondary Cu(2+) binding sites, and indeed many of these residues were ones found to display the elevated longitudinal (15)N PREs in the solid phase.
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Affiliation(s)
- Philippe S Nadaud
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, OH 43210, USA
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22
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Flambard A, Köhler FH, Lescouëzec R, Revel B. Probing Spin Density and Local Structure in the Prussian Blue Analogues CsCd[Fe/Co(CN)6]⋅0.5 H2O and Cd3[Fe/Co(CN)6]2⋅15 H2O with Solid-State MAS NMR Spectroscopy. Chemistry 2011; 17:11567-75. [DOI: 10.1002/chem.201100778] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Indexed: 11/11/2022]
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Ling Y, Khade RL, Zhang Y. Structural, EPR Superhyperfine, and NMR Hyperfine Properties of the Cu−Octarepeat Binding Site in the Prion Protein. J Phys Chem B 2011; 115:2663-70. [DOI: 10.1021/jp1119298] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yan Ling
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, Mississippi 39406, United States
| | - Rahul L. Khade
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, Mississippi 39406, United States
| | - Yong Zhang
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, Mississippi 39406, United States
- Department of Chemistry, Chemical Biology, and Biomedical Engineering, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, United States
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Casabianca LB, Shaibat MA, Cai WW, Park S, Piner R, Ruoff RS, Ishii Y. NMR-based structural modeling of graphite oxide using multidimensional 13C solid-state NMR and ab initio chemical shift calculations. J Am Chem Soc 2010; 132:5672-6. [PMID: 20359218 PMCID: PMC2857913 DOI: 10.1021/ja9030243] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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Chemically modified graphenes and other graphite-based materials have attracted growing interest for their unique potential as lightweight electronic and structural nanomaterials. It is an important challenge to construct structural models of noncrystalline graphite-based materials on the basis of NMR or other spectroscopic data. To address this challenge, a solid-state NMR (SSNMR)-based structural modeling approach is presented on graphite oxide (GO), which is a prominent precursor and interesting benchmark system of modified graphene. An experimental 2D 13C double-quantum/single-quantum correlation SSNMR spectrum of 13C-labeled GO was compared with spectra simulated for different structural models using ab initio geometry optimization and chemical shift calculations. The results show that the spectral features of the GO sample are best reproduced by a geometry-optimized structural model that is based on the Lerf−Klinowski model (Lerf, A. et al. Phys. Chem. B1998, 102, 4477); this model is composed of interconnected sp2, 1,2-epoxide, and COH carbons. This study also convincingly excludes the possibility of other previously proposed models, including the highly oxidized structures involving 1,3-epoxide carbons (Szabo, I. et al. Chem. Mater.2006, 18, 2740). 13C chemical shift anisotropy (CSA) patterns measured by a 2D 13C CSA/isotropic shift correlation SSNMR were well reproduced by the chemical shift tensor obtained by the ab initio calculation for the former model. The approach presented here is likely to be applicable to other chemically modified graphenes and graphite-based systems.
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Affiliation(s)
- Leah B Casabianca
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, USA
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25
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Shaibat MA, Casabianca LB, Siberio-Pérez DY, Matzger AJ, Ishii Y. Distinguishing polymorphs of the semiconducting pigment copper phthalocyanine by solid-state NMR and Raman spectroscopy. J Phys Chem B 2010; 114:4400-6. [PMID: 20225842 DOI: 10.1021/jp9061412] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cu(II)(phthalocyanine) (CuPc) is broadly utilized as an archetypal molecular semiconductor and is the most widely used blue printing pigment. CuPc crystallizes in six different forms; the chemical and physical properties are substantially modulated by its molecular packing among these polymorphs. Despite the growing importance of this system, spectroscopic identification of different polymorphs for CuPc has posed difficulties. This study presents the first example of spectroscopic distinction of alpha- and beta-forms of CuPc, the most widely used polymorphs, by solid-state NMR (SSNMR) and Raman spectroscopy. (13)C high-resolution SSNMR spectra of alpha- and beta-CuPc using very-fast magic angle spinning (VFMAS) at 20 kHz show that hyperfine shifts sensitively reflect polymorphs of CuPc. The experimental results were confirmed by ab initio chemical shift calculations. (13)C and (1)H SSNMR relaxation times of alpha- and beta-CuPc under VFMAS also showed marked differences, presumably because of the difference in electronic spin correlation times in the two forms. Raman spectroscopy also provided another reliable method of differentiation between the two polymorphs.
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Affiliation(s)
- Medhat A Shaibat
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, USA
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26
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Ling Y, Mills C, Weber R, Yang L, Zhang Y. NMR, IR/Raman, and structural properties in HNO and RNO (R = alkyl and aryl) metalloporphyrins with implication for the HNO-myoglobin complex. J Am Chem Soc 2010; 132:1583-91. [PMID: 20078039 PMCID: PMC2820278 DOI: 10.1021/ja907342s] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Structural and functional details of heme protein complexes with HNO and the isoelectronic RNO (R = alkyl and aryl) molecules (metabolic intermediates) are largely unknown. We report a quantum chemical investigation of three characteristic spectroscopic properties, (1)H and (15)N NMR chemical shifts and NO vibrational frequencies in synthetic HNO and RNO heme complexes, with theory-versus-experiment correlation coefficients R(2) = 0.990-0.998. A new density functional theory (DFT) method was found to yield excellent predictions of experimental structures of HNO, RNO, and NO heme systems. Interestingly, this method also helps the identification of an excellent linear quantitative structure observable relationship between NO vibrational frequencies and bond lengths in all of these NO-containing systems. This suggests that NO vibrations are largely local effects of the NO bonds in these complexes and may help deduce the NO bond lengths from using experimental vibrational data in these systems. The NO vibrational frequencies in HNO, RNO, and NO metalloporphyrins were found to follow a general trend of NO > RNO > HNO complexes, as a result of the electron populations in the antibonding NO orbitals of NO < RNO < HNO complexes. Investigations of the NMR and IR/Raman spectroscopic data in HNO metal complexes show that HNO is a strong pi-acid. In addition, we performed the first quantum chemical investigation of the hydrogen-bond effect on HNO in MbHNO (Mb = myoglobin) models. On the basis of comparisons with experimental (1)H and (15)N NMR results and NO vibrational frequency in MbHNO, a dual hydrogen-bond mode for HNO in MbHNO was proposed. The enhanced stability from this dual hydrogen bonding may provide a basis for the unusual stability of MbHNO observed experimentally. These results should facilitate spectroscopic characterizations and structural investigations of HNO and RNO heme proteins and models.
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Affiliation(s)
- Yan Ling
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406
| | - Christopher Mills
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406
| | - Rebecca Weber
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406
| | - Liu Yang
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406
| | - Yong Zhang
- Department of Chemistry and Biochemistry, University of Southern Mississippi, 118 College Drive #5043, Hattiesburg, MS 39406
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Miličević A, Raos N. Theoretical analysis of apical bonding in copper(II) chelates withN-substituted amino acids. J Appl Crystallogr 2009. [DOI: 10.1107/s0021889809047748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The interdependence between the side of apical coordination of H2O and steric crowding at the apical positions was investigated on a set of 34 copper(II) bis-complexes withN- andN,N-substituted amino acids. As a measure of steric crowding, overlapping volumesV* were used, calculated using a modified overlapping spheres method. Steric crowding around the apically bonded ligand was the same for this set of complexes as for the copper(II) bis-complexes with naturally occurring amino acids, with the optimal occupied volume values between 1 and 1.5 Å3. The interdependence between the length of the apical bond and distortion of the coordination polyhedron was also studied. The apical bond length showed sigmoidal dependence on the magnitude of distortion.
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Aguiar PM, Katz MJ, Leznoff DB, Kroeker S. Natural abundance 13C and 15N solid-state NMR analysis of paramagnetic transition-metal cyanide coordination polymers. Phys Chem Chem Phys 2009; 11:6925-34. [PMID: 19652826 DOI: 10.1039/b907747b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The (13)C and (15)N MAS NMR spectra of a series of well-characterized paramagnetic metal cyanide coordination polymers are acquired at natural abundance, without the need for polarization transfer methods such as cross-polarization or INEPT. For systems where the paramagnetic centre is outside of the cyanide framework, well-resolved (13)C and (15)N spectra of cyanide ligands are obtained. Chemical shifts deviate from typical diamagnetic cyanide ranges and depend only partly on the cyanide coordination type, being dominated by their proximity to the paramagnetic center. A combination of the observed isotropic chemical shifts, their temperature dependence, and transverse relaxation time constants (T(2)) provides valuable local structural information and lays the foundation for the structural elucidation of unknown paramagnetic metal-cyanide coordination polymers. Toward this end, we apply these solid-state NMR techniques to a pair of compounds without a priori knowledge of the structures.
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Affiliation(s)
- Pedro M Aguiar
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, Canada
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Nadaud PS, Helmus JJ, Kall SL, Jaroniec CP. Paramagnetic Ions Enable Tuning of Nuclear Relaxation Rates and Provide Long-Range Structural Restraints in Solid-State NMR of Proteins. J Am Chem Soc 2009; 131:8108-20. [DOI: 10.1021/ja900224z] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Philippe S. Nadaud
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Jonathan J. Helmus
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Stefanie L. Kall
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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30
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Flambard A, Köhler F, Lescouëzec R. Revisiting Prussian Blue Analogues with Solid-State MAS NMR Spectroscopy: Spin Density and Local Structure in [Cd3{Fe(CN)6}2]⋅15 H2O. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805415] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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Flambard A, Köhler F, Lescouëzec R. Revisiting Prussian Blue Analogues with Solid-State MAS NMR Spectroscopy: Spin Density and Local Structure in [Cd3{Fe(CN)6}2]⋅15 H2O. Angew Chem Int Ed Engl 2009; 48:1673-6. [DOI: 10.1002/anie.200805415] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Desmarets C, Poli F, Le Goff XF, Müller K, Amouri H. A unique type of a dicobalt cage templated by a weakly coordinated hexafluorophosphate anion: design, structure and solid-state NMR investigations. Dalton Trans 2009:10429-32. [DOI: 10.1039/b918888f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Affiliation(s)
- Cecil Dybowski*
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Shi Bai
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716
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35
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Zhang Y, Oldfield E. NMR hyperfine shifts in blue copper proteins: a quantum chemical investigation. J Am Chem Soc 2008; 130:3814-23. [PMID: 18314973 DOI: 10.1021/ja075978b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present the results of the first quantum chemical investigations of 1H NMR hyperfine shifts in the blue copper proteins (BCPs): amicyanin, azurin, pseudoazurin, plastocyanin, stellacyanin, and rusticyanin. We find that very large structural models that incorporate extensive hydrogen bond networks, as well as geometry optimization, are required to reproduce the experimental NMR hyperfine shift results, the best theory vs experiment predictions having R2 = 0.94, a slope = 1.01, and a SD = 40.5 ppm (or approximately 4.7% of the overall approximately 860 ppm shift range). We also find interesting correlations between the hyperfine shifts and the bond and ring critical point properties computed using atoms-in-molecules theory, in addition to finding that hyperfine shifts can be well-predicted by using an empirical model, based on the geometry-optimized structures, which in the future should be of use in structure refinement.
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Affiliation(s)
- Yong Zhang
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA
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36
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Wickramasinghe NP, Shaibat MA, Jones CR, Casabianca LB, de Dios AC, Harwood JS, Ishii Y. Progress in C13 and H1 solid-state nuclear magnetic resonance for paramagnetic systems under very fast magic angle spinning. J Chem Phys 2008; 128:052210. [DOI: 10.1063/1.2833574] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Casabianca LB, de Dios AC. Ab initiocalculations of NMR chemical shifts. J Chem Phys 2008; 128:052201. [DOI: 10.1063/1.2816784] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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38
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Fernández P, Pritzkow H, Carbó JJ, Hofmann P, Enders M. 1H NMR Investigation of Paramagnetic Chromium(III) Olefin Polymerization Catalysts: Experimental Results, Shift Assignment and Prediction by Quantum Chemical Calculations. Organometallics 2007. [DOI: 10.1021/om070173y] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pablo Fernández
- Anorganisch- and Organisch-Chemisches Institut der Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel lí Domingo s/n, 43007 Tarragona, Spain
| | - Hans Pritzkow
- Anorganisch- and Organisch-Chemisches Institut der Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel lí Domingo s/n, 43007 Tarragona, Spain
| | - Jorge J. Carbó
- Anorganisch- and Organisch-Chemisches Institut der Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel lí Domingo s/n, 43007 Tarragona, Spain
| | - Peter Hofmann
- Anorganisch- and Organisch-Chemisches Institut der Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel lí Domingo s/n, 43007 Tarragona, Spain
| | - Markus Enders
- Anorganisch- and Organisch-Chemisches Institut der Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel lí Domingo s/n, 43007 Tarragona, Spain
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Mukkamala D, Zhang Y, Oldfield E. A Solid State 13C NMR, Crystallographic, and Quantum Chemical Investigation of Phenylalanine and Tyrosine Residues in Dipeptides and Proteins. J Am Chem Soc 2007; 129:7385-92. [PMID: 17506558 DOI: 10.1021/ja071227y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the results of a solid-state NMR and quantum chemical investigation of the 13C gamma NMR chemical shifts in phenylalanine and tyrosine in dipeptides and proteins. Accurate computation of the experimental shifts is shown to require a good description of local electrostatic field effects, and we find the best results (R2=0.94, rmsd=1.6 ppm, range = 17.1 ppm, N=14) by using a self-consistent reaction field continuum model. There are no obvious correlations with phi, psi, chi 1, or chi2 torsion angles, unlike the results seen with other amino acids. There is, however, a linear relation between computed C gamma atomic charges and shifts for the 14 peptide as well as 18 protein residues investigated. This result is similar to the correlation reported in the 1960s between pi-electron density and 13C shifts for classical 4n + 2 (n=0, 1, 2) pi-electron aromatic species, such as cyclopentadienide and the tropylium cation, and in fact, we found that the shielding/atomic charge correlation seen in the peptides and proteins is virtually identical to that seen with a broad range of aromatic carbocations/carbanions. These results suggest the dominance of an electrostatic field polarization model in which increasing pi electron density results in an increase in C gamma atomic charge and increased shielding (of sigma 11 and sigma 22, perpendicular to the pi orbital) in Phe and Tyr, as well as in the other aromatic species. These results are of general interest since they demonstrate the importance of electrostatic field effects on Phe and Tyr C gamma chemical shifts in peptides and proteins and imply that inclusion of these effects will be necessary in order to interpret the shifts of other aromatic species, such as drug molecules, bound to proteins.
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Affiliation(s)
- Dushyant Mukkamala
- Center for Biophysics and Computational Biology, 607 South Mathews Avenue, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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40
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Pintacuda G, Giraud N, Pierattelli R, Böckmann A, Bertini I, Emsley L. Solid-State NMR Spectroscopy of a Paramagnetic Protein: Assignment and Study of Human Dimeric Oxidized CuII–ZnII Superoxide Dismutase (SOD). Angew Chem Int Ed Engl 2007; 46:1079-82. [PMID: 17191298 DOI: 10.1002/anie.200603093] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Guido Pintacuda
- Laboratoire de Chimie, UMR 5182 CNRS-ENS Lyon, Ecole Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon, France
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41
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Pintacuda G, Giraud N, Pierattelli R, Böckmann A, Bertini I, Emsley L. Solid-State NMR Spectroscopy of a Paramagnetic Protein: Assignment and Study of Human Dimeric Oxidized CuII–ZnII Superoxide Dismutase (SOD). Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200603093] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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42
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Wickramasinghe NP, Ishii Y. Sensitivity enhancement, assignment, and distance measurement in 13C solid-state NMR spectroscopy for paramagnetic systems under fast magic angle spinning. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2006; 181:233-43. [PMID: 16750405 DOI: 10.1016/j.jmr.2006.05.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2006] [Revised: 05/11/2006] [Accepted: 05/11/2006] [Indexed: 05/10/2023]
Abstract
Despite success of previous studies, high-resolution solid-state NMR (SSNMR) of paramagnetic systems has been still largely unexplored because of limited sensitivity/resolution and difficulty in assignment due to large paramagnetic shifts. Recently, we demonstrated that an approach using very-fast magic angle spinning (VFMAS; spinning speed 20kHz) enhances resolution/sensitivity in (13)C SSNMR for paramagnetic complexes [Y. Ishii, S. Chimon, N.P. Wickramasinghe, A new approach in 1D and 2D (13)C high resolution solid-state NMR spectroscopy of paramagnetic organometallic complexes by very fast magic-angle spinning, J. Am. Chem. Soc. 125 (2003) 3438-3439]. In this study, we present a new strategy for sensitivity enhancement, signal assignment, and distance measurement in (13)C SSNMR under VFMAS for unlabeled paramagnetic complexes using recoupling-based polarization transfer. As a robust alternative of cross-polarization (CP), rapid application of recoupling-based polarization transfer under VFMAS is proposed. In the present approach, a dipolar-based analog of INEPT (dipolar INEPT) methods is used for polarization transfer and a (13)C signal is observed under VFMAS without (1)H decoupling. The resulting low duty factor permits rapid signal accumulation without probe arcing at recycle times ( approximately 3 ms/scan) matched to short (1)H T(1) values of small paramagnetic systems ( approximately 1 ms). Experiments on Cu(dl-Ala)(2) showed that the fast repetition approach under VFMAS provided sensitivity enhancement by a factor of 8-66 for a given sample, compared with the (13)C MAS spectrum under moderate MAS at 5kHz. The applicability of this approach was also demonstrated for a more challenging system, Mn(acac)(3), for which (13)C and (1)H paramagnetic shift dispersions reach 1500 and 700 ppm, respectively. It was shown that effective-evolution-time dependence of transferred signals in dipolar INEPT permitted one to distinguish (13)CH, (13)CH(2), (13)CH(3), (13)CO2- groups in 1D experiments for Cu(DL-Ala)(2) and Cu(Gly)(2). Applications of this technique to 2D (13)C/(1)H correlation NMR under VFMAS yielded reliable assignments of (1)H resonances as well as (13)C resonances for Cu(DL-Ala)(2) and Mn(acac)(3). Quantitative analysis of cross-peak intensities in 2D (13)C/(1)H correlation NMR spectra of Cu(DL-Ala)(2) provided distance information between non-bonded (13)C-(1)H pairs in the paramagnetic system.
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