1
|
Špačková J, Goldberga I, Yadav R, Cazals G, Lebrun A, Verdié P, Métro TX, Laurencin D. Fast and Cost-Efficient 17 O-Isotopic Labeling of Carboxylic Groups in Biomolecules: From Free Amino Acids to Peptide Chains. Chemistry 2023; 29:e202203014. [PMID: 36333272 DOI: 10.1002/chem.202203014] [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: 09/27/2022] [Accepted: 11/04/2022] [Indexed: 11/08/2022]
Abstract
17 O NMR spectroscopy is a powerful technique, which can provide unique information regarding the structure and reactivity of biomolecules. However, the low natural abundance of 17 O (0.04 %) generally requires working with enriched samples, which are not easily accessible. Here, we present simple, fast and cost-efficient 17 O-enrichment strategies for amino acids and peptides by using mechanochemistry. First, five unprotected amino acids were enriched under ambient conditions, consuming only microliter amounts of costly labeled water, and producing pure molecules with enrichment levels up to ∼40 %, yields ∼60-85 %, and no loss of optical purity. Subsequently, 17 O-enriched Fmoc/tBu-protected amino acids were produced on a 1 g/day scale with high enrichment levels. Lastly, a site-selective 17 O-labeling of carboxylic functions in peptide side-chains was achieved for RGD and GRGDS peptides, with ∼28 % enrichment level. For all molecules, 17 O ssNMR spectra were recorded at 14.1 T in reasonable times, making this an important step forward for future NMR studies of biomolecules.
Collapse
Affiliation(s)
| | | | - Rishit Yadav
- ICGM, CNRS, UM, ENSCM, 34293, Montpellier, France
| | | | | | | | | | | |
Collapse
|
2
|
Muniyappan S, Lin Y, Lee YH, Kim JH. 17O NMR Spectroscopy: A Novel Probe for Characterizing Protein Structure and Folding. BIOLOGY 2021; 10:biology10060453. [PMID: 34064021 PMCID: PMC8223985 DOI: 10.3390/biology10060453] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/14/2021] [Accepted: 05/18/2021] [Indexed: 11/16/2022]
Abstract
Oxygen is a key atom that maintains biomolecular structures, regulates various physiological processes, and mediates various biomolecular interactions. Oxygen-17 (17O), therefore, has been proposed as a useful probe that can provide detailed information about various physicochemical features of proteins. This is attributed to the facts that (1) 17O is an active isotope for nuclear magnetic resonance (NMR) spectroscopic approaches; (2) NMR spectroscopy is one of the most suitable tools for characterizing the structural and dynamical features of biomolecules under native-like conditions; and (3) oxygen atoms are frequently involved in essential hydrogen bonds for the structural and functional integrity of proteins or related biomolecules. Although 17O NMR spectroscopic investigations of biomolecules have been considerably hampered due to low natural abundance and the quadruple characteristics of the 17O nucleus, recent theoretical and technical developments have revolutionized this methodology to be optimally poised as a unique and widely applicable tool for determining protein structure and dynamics. In this review, we recapitulate recent developments in 17O NMR spectroscopy to characterize protein structure and folding. In addition, we discuss the highly promising advantages of this methodology over other techniques and explain why further technical and experimental advancements are highly desired.
Collapse
Affiliation(s)
- Srinivasan Muniyappan
- Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea;
| | - Yuxi Lin
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Cheongju 28119, Korea;
| | - Young-Ho Lee
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Cheongju 28119, Korea;
- Department of Bio-Analytical Science, University of Science and Technology, Daejeon 34113, Korea
- Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon 34134, Korea
- Research Headquarters, Korea Brain Research Institute, Daegu 41068, Korea
- Correspondence: (Y.-H.L.); (J.H.K.)
| | - Jin Hae Kim
- Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea;
- Correspondence: (Y.-H.L.); (J.H.K.)
| |
Collapse
|
3
|
Klein BA, Tkachuk DG, Terskikh VV, Michaelis VK. Expanding the NMR toolkit for biological solids: oxygen-17 enriched Fmoc-amino acids. NEW J CHEM 2021. [DOI: 10.1039/d1nj02847b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We report the solid-state 17O NMR parameters for five previously uncharacterized N-α-fluoren-9-yl-methoxycarbonyl-O-t-butyl (Fmoc) protected amino acids.
Collapse
|
4
|
Lin B, Hung I, Gan Z, Chien PH, Spencer HL, Smith SP, Wu G. 17 O NMR Studies of Yeast Ubiquitin in Aqueous Solution and in the Solid State. Chembiochem 2020; 22:826-829. [PMID: 33058374 DOI: 10.1002/cbic.202000659] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 10/14/2020] [Indexed: 12/18/2022]
Abstract
We report a general method for amino acid-type specific 17 O-labeling of recombinant proteins in Escherichia coli. In particular, we have prepared several [1-13 C,17 O]-labeled yeast ubiquitin (Ub) samples including Ub-[1-13 C,17 O]Gly, Ub-[1-13 C,17 O]Tyr, and Ub-[1-13 C,17 O]Phe using the auxotrophic E. coli strain DL39 GlyA λDE3 (aspC- tyrB- ilvE- glyA- λDE3). We have also produced Ub-[η-17 O]Tyr, in which the phenolic group of Tyr59 is 17 O-labeled. We show for the first time that 17 O NMR signals from protein terminal residues and side chains can be readily detected in aqueous solution. We also reported solid-state 17 O NMR spectra for Ub-[1-13 C,17 O]Tyr and Ub-[1-13 C,17 O]Phe obtained at an ultrahigh magnetic field, 35.2 T (1.5 GHz for 1 H). This work represents a significant advance in the field of 17 O NMR studies of proteins.
Collapse
Affiliation(s)
- Binyang Lin
- Department of Chemistry, Queen's University, Kingston, ON K7L 3N6, Canada
| | - Ivan Hung
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - Zhehong Gan
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - Po-Hsiu Chien
- Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - Holly L Spencer
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada
| | - Steven P Smith
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON K7L 3N6, Canada
| | - Gang Wu
- Department of Chemistry, Queen's University, Kingston, ON K7L 3N6, Canada
| |
Collapse
|
5
|
Abstract
Despite the well-characterized structural symmetry of the dimeric transmembrane antibiotic gramicidin A, we show that the symmetry is broken by selective hydrogen bonding between eight waters comprising a transmembrane water wire and a specific subset of the 26 pore-lining carbonyl oxygens of the gramicidin A channel. The 17O NMR spectroscopic resolution of the carbonyl resonances from the two subunits required the use of a world record high field magnet (35.2 T; 1,500 MHz for 1H). Uniquely, this result documented the millisecond timescale stability of the water wire orientation within the gramicidin A pore that had been reported to have only subnanosecond stability. These 17O spectroscopic results portend wide applications in molecular biophysics and beyond. Water wires are critical for the functioning of many membrane proteins, as in channels that conduct water, protons, and other ions. Here, in liquid crystalline lipid bilayers under symmetric environmental conditions, the selective hydrogen bonding interactions between eight waters comprising a water wire and a subset of 26 carbonyl oxygens lining the antiparallel dimeric gramicidin A channel are characterized by 17O NMR spectroscopy at 35.2 T (or 1,500 MHz for 1H) and computational studies. While backbone 15N spectra clearly indicate structural symmetry between the two subunits, single site 17O labels of the pore-lining carbonyls report two resonances, implying a break in dimer symmetry caused by the selective interactions with the water wire. The 17O shifts document selective water hydrogen bonding with carbonyl oxygens that are stable on the millisecond timescale. Such interactions are supported by density functional theory calculations on snapshots taken from molecular dynamics simulations. Water hydrogen bonding in the pore is restricted to just three simultaneous interactions, unlike bulk water environs. The stability of the water wire orientation and its electric dipole leads to opposite charge-dipole interactions for K+ ions bound at the two ends of the pore, thereby providing a simple explanation for an ∼20-fold difference in K+ affinity between two binding sites that are ∼24 Å apart. The 17O NMR spectroscopy reported here represents a breakthrough in high field NMR technology that will have applications throughout molecular biophysics, because of the acute sensitivity of the 17O nucleus to its chemical environment.
Collapse
|
6
|
Wu G. 17O NMR studies of organic and biological molecules in aqueous solution and in the solid state. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2019; 114-115:135-191. [PMID: 31779879 DOI: 10.1016/j.pnmrs.2019.06.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/11/2019] [Accepted: 06/11/2019] [Indexed: 06/10/2023]
Abstract
This review describes the latest developments in the field of 17O NMR spectroscopy of organic and biological molecules both in aqueous solution and in the solid state. In the first part of the review, a general theoretical description of the nuclear quadrupole relaxation process in isotropic liquids is presented at a mathematical level suitable for non-specialists. In addition to the first-order quadrupole interaction, the theory also includes additional relaxation mechanisms such as the second-order quadrupole interaction and its cross correlation with shielding anisotropy. This complete theoretical treatment allows one to assess the transverse relaxation rate (thus the line width) of NMR signals from half-integer quadrupolar nuclei in solution over the entire range of motion. On the basis of this theoretical framework, we discuss general features of quadrupole-central-transition (QCT) NMR, which is a particularly powerful method of studying biomolecules in the slow motion regime. Then we review recent advances in 17O QCT NMR studies of biological macromolecules in aqueous solution. The second part of the review is concerned with solid-state 17O NMR studies of organic and biological molecules. As a sequel to the previous review on the same subject [G. Wu, Prog. Nucl. Magn. Reson. Spectrosc. 52 (2008) 118-169], the current review provides a complete coverage of the literature published since 2008 in this area.
Collapse
Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada.
| |
Collapse
|
7
|
Martin RW, Kelly JE, Kelz JI. Advances in instrumentation and methodology for solid-state NMR of biological assemblies. J Struct Biol 2018; 206:73-89. [PMID: 30205196 DOI: 10.1016/j.jsb.2018.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/08/2018] [Accepted: 09/06/2018] [Indexed: 01/11/2023]
Abstract
Many advances in instrumentation and methodology have furthered the use of solid-state NMR as a technique for determining the structures and studying the dynamics of molecules involved in complex biological assemblies. Solid-state NMR does not require large crystals, has no inherent size limit, and with appropriate isotopic labeling schemes, supports solving one component of a complex assembly at a time. It is complementary to cryo-EM, in that it provides local, atomic-level detail that can be modeled into larger-scale structures. This review focuses on the development of high-field MAS instrumentation and methodology; including probe design, benchmarking strategies, labeling schemes, and experiments that enable the use of quadrupolar nuclei in biomolecular NMR. Current challenges facing solid-state NMR of biological assemblies and new directions in this dynamic research area are also discussed.
Collapse
Affiliation(s)
- Rachel W Martin
- Department of Chemistry, University of California, Irvine 92697-2025, United States; Department of Molecular Biology and Biochemistry, University of California, Irvine 92697-3900, United States.
| | - John E Kelly
- Department of Chemistry, University of California, Irvine 92697-2025, United States
| | - Jessica I Kelz
- Department of Chemistry, University of California, Irvine 92697-2025, United States
| |
Collapse
|
8
|
Kong X, Tang A, Wang R, Ye E, Terskikh V, Wu G. Are the amide bonds in N-acyl imidazoles twisted? A combined solid-state 17O NMR, crystallographic, and computational study. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0397] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report synthesis of 17O-labeling and solid-state 17O NMR measurements of three N-acyl imidazoles of the type R-C(17O)-Im: R = p-methoxycinnamoyl (MCA-Im), R = 4-(dimethylamino)benzoyl (DAB-Im), and R = 2,4,6-trimethylbenzoyl (TMB-Im). Solid-state 17O NMR experiments allowed us to determine for the first time the 17O quadrupole coupling and chemical shift tensors in this class of organic compounds. We also determined the crystal structures of these compounds using single-crystal X-ray diffraction. The crystal structures show that, while the C(O)–N amide bond in DAB-Im exhibits a small twist, those in MCA-Im and TMB-Im are essentially planar. We found that, in these N-acyl imidazoles, the 17O quadrupole coupling and chemical shift tensors depend critically on the torsion angle between the conjugated acyl group and the C(O)–N amide plane. The computational results from a plane-wave DFT approach, which takes into consideration the entire crystal lattice, are in excellent agreement with the experimental solid-state 17O NMR results. Quantum chemical computations also show that the dependence of 17O NMR parameters on the Ar–C(O) bond rotation is very similar to that previously observed for the C(O)–N bond rotation in twisted amides. We conclude that one should be cautious in linking the observed NMR chemical shifts only to the twist of the C(O)–N amide bond.
Collapse
Affiliation(s)
- Xianqi Kong
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Aaron Tang
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Ruiyao Wang
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| | - Eric Ye
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Victor Terskikh
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
- Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
| | - Gang Wu
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston, ON K7L 3N6, Canada
| |
Collapse
|
9
|
Hanashima S, Fujiwara N, Matsumoto K, Iwasaki N, Zheng GQ, Torigoe H, Suzuki K, Taniguchi N, Yamaguchi Y. A solution 17O-NMR approach for observing an oxidized cysteine residue in Cu,Zn-superoxide dismutase. Chem Commun (Camb) 2013; 49:1449-51. [PMID: 23323266 DOI: 10.1039/c2cc36918d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Solution (17)O-NMR application to biological macromolecules is extremely limited. We describe here (17)O-NMR observation of the (17)O(2)-oxidized cysteine side chain of human Cu,Zn-superoxide dismutase in solution using selective (17)O(2) oxidation. (17)O-NMR with the aid of (17)O-labeling has wide potential to probe the environment and dynamics of oxidizable functionalities in proteins.
Collapse
Affiliation(s)
- Shinya Hanashima
- Structural Glycobiology Team, RIKEN ASI, 2-1 Hirosawa, Wako-shi, 351-0198 Saitama, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Dunbar KL, Mitchell DA. Insights into the mechanism of peptide cyclodehydrations achieved through the chemoenzymatic generation of amide derivatives. J Am Chem Soc 2013; 135:8692-701. [PMID: 23721104 DOI: 10.1021/ja4029507] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Current strategies for generating peptides and proteins bearing amide carbonyl derivatives rely on solid-phase peptide synthesis for amide functionalization. Although such strategies have been successfully implemented, technical limitations restrict both the length and sequence of the synthetic fragments. Herein we report the repurposing of a thiazole/oxazole-modified microcin (TOMM) cyclodehydratase to site-specifically install amide backbone labels onto diverse peptide substrates, a method we refer to as azoline-mediated peptide backbone labeling (AMPL). This convenient chemoenzymatic strategy can generate both thioamides and amides with isotopically labeled oxygen atoms. Moreover, we demonstrate the first leader peptide-independent activity of a TOMM synthetase, circumventing the requirement that sequences of interest be fused to a leader peptide for modification. Through bioinformatics-guided site-directed mutagenesis, we also convert a strictly dehydrogenase-dependent TOMM azole synthetase into an azoline synthetase. This vastly expands the spectrum of substrates modifiable by AMPL by allowing any in vitro reconstituted TOMM synthetase to be employed. To demonstrate the utility of AMPL for mechanistic enzymology studies, an (18)O-labeled substrate was generated to provide direct evidence that cyclodehydrations in TOMMs occur through the phosphorylation of the carbonyl oxygen preceding the cyclized residue. Furthermore, we demonstrate that AMPL is a useful tool for establishing the location of azolines both on in vitro modified peptides and azoline-containing natural products.
Collapse
Affiliation(s)
- Kyle L Dunbar
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | | |
Collapse
|
11
|
Some aspects of the NMR chemical shift/structure correlation in the structural characterization of polymers and biopolymers. Polym J 2012. [DOI: 10.1038/pj.2012.95] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
12
|
Goswami M, Madhu PK. Combining dipolar-quadrupolar correlation spectroscopy with isotropic shift resolution in magic-angle-spinning 17O NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2012; 219:4-12. [PMID: 22595292 DOI: 10.1016/j.jmr.2012.03.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2011] [Revised: 03/05/2012] [Accepted: 03/17/2012] [Indexed: 05/31/2023]
Abstract
We explore the effect of heteronuclear dipolar recoupling on the satellite and multiple-quantum transitions of a half-integer-spin quadrupolar nucleus coupled to a single spin-12. A three-dimensional experiment is introduced that resolves different quadrupolar sites whilst allowing simultaneous extraction of the quadrupolar coupling constants, asymmetry parameters of the electric field gradient, and the isotropic shifts of the quadrupolar nucleus. The experiment also enables estimation of the heteronuclear dipolar coupling constant between the spin-1/2 and half-integer spin quadrupolar nucleus. The relative orientation of the dipolar tensor with respect to the quadrupolar tensor can be estimated by comparing experiments and simulations. Experimental results are shown on a sample of brucite, Mg((17)OH)(2), where the (1)H-(17)O bond distance is estimated.
Collapse
Affiliation(s)
- M Goswami
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, India
| | | |
Collapse
|
13
|
Hagaman EW, Chen B, Jiao J, Parsons W. Solid-state 17O NMR study of benzoic acid adsorption on metal oxide surfaces. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 41:60-67. [PMID: 22245610 DOI: 10.1016/j.ssnmr.2011.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 12/02/2011] [Accepted: 12/03/2011] [Indexed: 05/31/2023]
Abstract
Solid-state (17)O NMR spectra of (17)O-labeled benzoic and anisic acids are reported and benzoic acid is used to probe the surface of metal oxides. Complexes formed when benzoic acid is dry mixed with mesoporous silica, and nonporous titania and alumina are characterized. Chemical reactions with silica are not observed. The nature of benzoic acid on silica is a function of the water content of the oxide. The acid disperses in the pores of the silica if the silica is in equilibrium with ambient laboratory humidity. The acid displays high mobility as evidenced by a liquid-like, Lorentzian resonance. Excess benzoic acid remains as the crystalline hydrogen-bonded dimer. Benzoic acid reacts with titania and alumina surfaces in equilibrium with laboratory air to form the corresponding titanium and aluminum benzoates. In both materials the oxygen of the (17)O-labeled acid is bound to the metal, showing the reaction proceeds by bond formation between oxygen deficient metal sites and the oxygen of the carboxylic acid. (27)Al MAS NMR confirms this mechanism for the reaction on alumina. Dry mixing of benzoic acid with alumina rapidly quenches pentacoordinate aluminum sites, excellent evidence that these sites are confined to the surface of the alumina particles.
Collapse
Affiliation(s)
- Edward W Hagaman
- Chemical Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA.
| | | | | | | |
Collapse
|
14
|
Zhu J, Ye E, Terskikh V, Wu G. Solid-state (17)O NMR spectroscopy of large protein-ligand complexes. Angew Chem Int Ed Engl 2011; 49:8399-402. [PMID: 20672261 DOI: 10.1002/anie.201002041] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, Queen's University, Kingston, ON K7L 3N6, Canada
| | | | | | | |
Collapse
|
15
|
Zhu J, Lau JYC, Wu G. A solid-state (17)O NMR study of L-tyrosine in different ionization states: implications for probing tyrosine side chains in proteins. J Phys Chem B 2010; 114:11681-8. [PMID: 20712305 DOI: 10.1021/jp1055123] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report experimental characterization of (17)O quadrupole coupling (QC) and chemical shift (CS) tensors for the phenolic oxygen in three l-tyrosine (l-Tyr) compounds: l-Tyr, l-Tyr.HCl, and Na(2)(l-Tyr). This is the first time that these fundamental (17)O NMR tensors are completely determined for phenolic oxygens in different ionization states. We find that, while the (17)O QC tensor changes very little upon phenol ionization, the (17)O CS tensor displays a remarkable sensitivity. In particular, the isotropic (17)O chemical shift increases by approximately 60 ppm upon phenol ionization, which is 6 times larger than the corresponding change in the isotropic (13)C chemical shift for the C(zeta) nucleus of the same phenol group. By examining the CS tensor orientation in the molecular frame of reference, we discover a "cross-over" effect between delta(11) and delta(22) components for both (17)O and (13)C CS tensors. We demonstrate that the knowledge of such "cross-over" effects is crucial for understanding the relationship between the observed CS tensor components and chemical bonding. Our results suggest that solid-state (17)O NMR can potentially be used to probe the ionization state of tyrosine side chains in proteins.
Collapse
Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
| | | | | |
Collapse
|
16
|
Zhu J, Wu G. Quadrupole central transition 17O NMR spectroscopy of biological macromolecules in aqueous solution. J Am Chem Soc 2010; 133:920-32. [PMID: 21175170 DOI: 10.1021/ja1079207] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We demonstrate a general nuclear magnetic resonance (NMR) spectroscopic approach in obtaining high-resolution (17)O (spin-5/2) NMR spectra for biological macromolecules in aqueous solution. This approach, termed quadrupole central transition (QCT) NMR, is based on the multiexponential relaxation properties of half-integer quadrupolar nuclei in molecules undergoing slow isotropic tumbling motion. Under such a circumstance, Redfield's relaxation theory predicts that the central transition, m(I) = +1/2 ↔ -1/2, can exhibit relatively long transverse relaxation time constants, thus giving rise to relatively narrow spectral lines. Using three robust protein-ligand complexes of size ranging from 65 to 240 kDa, we have obtained (17)O QCT NMR spectra with unprecedented resolution, allowing the chemical environment around the targeted oxygen atoms to be directly probed for the first time. The new QCT approach increases the size limit of molecular systems previously attainable by solution (17)O NMR by nearly 3 orders of magnitude (1000-fold). We have also shown that, when both quadrupole and shielding anisotropy interactions are operative, (17)O QCT NMR spectra display an analogous transverse relaxation optimized spectroscopy type behavior in that the condition for optimal resolution depends on the applied magnetic field. We conclude that, with the currently available moderate and ultrahigh magnetic fields (14 T and higher), this (17)O QCT NMR approach is applicable to a wide variety of biological macromolecules. The new (17)O NMR parameters so obtained for biological molecules are complementary to those obtained from (1)H, (13)C, and (15)N NMR studies.
Collapse
Affiliation(s)
- Jianfeng Zhu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6
| | | |
Collapse
|
17
|
Saitô H, Ando I, Ramamoorthy A. Chemical shift tensor - the heart of NMR: Insights into biological aspects of proteins. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2010; 57:181-228. [PMID: 20633363 PMCID: PMC2905606 DOI: 10.1016/j.pnmrs.2010.04.005] [Citation(s) in RCA: 136] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 04/26/2010] [Indexed: 05/19/2023]
Affiliation(s)
- Hazime Saitô
- Department of Life Science, Himeji Institute of Technology, University of Hyogo, Kamigori, Hyog, 678-1297, Japan
| | - Isao Ando
- Department of Chemistry and Materials Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152-0033, Japan
| | - Ayyalusamy Ramamoorthy
- Biophysics and Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109-1055, USA
| |
Collapse
|
18
|
Zhu J, Ye E, Terskikh V, Wu G. Solid-State 17O NMR Spectroscopy of Large Protein-Ligand Complexes. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
19
|
Coarse grained molecular dynamics simulations of transmembrane protein-lipid systems. Int J Mol Sci 2010; 11:2393-420. [PMID: 20640160 PMCID: PMC2904924 DOI: 10.3390/ijms11062393] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 05/16/2010] [Accepted: 05/30/2010] [Indexed: 12/24/2022] Open
Abstract
Many biological cellular processes occur at the micro- or millisecond time scale. With traditional all-atom molecular modeling techniques it is difficult to investigate the dynamics of long time scales or large systems, such as protein aggregation or activation. Coarse graining (CG) can be used to reduce the number of degrees of freedom in such a system, and reduce the computational complexity. In this paper the first version of a coarse grained model for transmembrane proteins is presented. This model differs from other coarse grained protein models due to the introduction of a novel angle potential as well as a hydrogen bonding potential. These new potentials are used to stabilize the backbone. The model has been validated by investigating the adaptation of the hydrophobic mismatch induced by the insertion of WALP-peptides into a lipid membrane, showing that the first step in the adaptation is an increase in the membrane thickness, followed by a tilting of the peptide.
Collapse
|
20
|
Bilalbegović G. Nuclear Magnetic Resonance Parameters of Water Hexamers. J Phys Chem A 2009; 114:715-20. [DOI: 10.1021/jp9075614] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. Bilalbegović
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
| |
Collapse
|
21
|
Holt A, Killian JA. Orientation and dynamics of transmembrane peptides: the power of simple models. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2009; 39:609-21. [PMID: 20020122 PMCID: PMC2841270 DOI: 10.1007/s00249-009-0567-1] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2009] [Revised: 11/17/2009] [Accepted: 11/19/2009] [Indexed: 02/02/2023]
Abstract
In this review we discuss recent insights obtained from well-characterized model systems into the factors that determine the orientation and tilt angles of transmembrane peptides in lipid bilayers. We will compare tilt angles of synthetic peptides with those of natural peptides and proteins, and we will discuss how tilt can be modulated by hydrophobic mismatch between the thickness of the bilayer and the length of the membrane spanning part of the peptide or protein. In particular, we will focus on results obtained on tryptophan-flanked model peptides (WALP peptides) as a case study to illustrate possible consequences of hydrophobic mismatch in molecular detail and to highlight the importance of peptide dynamics for the experimental determination of tilt angles. We will conclude with discussing some future prospects and challenges concerning the use of simple peptide/lipid model systems as a tool to understand membrane structure and function.
Collapse
Affiliation(s)
- Andrea Holt
- Biochemistry of Membranes, Bijvoet Center for Biomolecular Research, Utrecht University, 3584CH Utrecht, The Netherlands.
| | | |
Collapse
|
22
|
Scarpelli F, Drescher M, Rutters-Meijneke T, Holt A, Rijkers DTS, Killian JA, Huber M. Aggregation of Transmembrane Peptides Studied by Spin-Label EPR. J Phys Chem B 2009; 113:12257-64. [DOI: 10.1021/jp901371h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francesco Scarpelli
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Malte Drescher
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Tania Rutters-Meijneke
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Andrea Holt
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Dirk T. S. Rijkers
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - J. Antoinette Killian
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| | - Martina Huber
- Department of Molecular Physics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands, Chemical Biology & Organic Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands, and Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, Utrecht, The Netherlands
| |
Collapse
|
23
|
Hung I, Uldry AC, Becker-Baldus J, Webber AL, Wong A, Smith ME, Joyce SA, Yates JR, Pickard CJ, Dupree R, Brown SP. Probing Heteronuclear 15N−17O and 13C−17O Connectivities and Proximities by Solid-State NMR Spectroscopy. J Am Chem Soc 2009; 131:1820-34. [DOI: 10.1021/ja805898d] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ivan Hung
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Anne-Christine Uldry
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Johanna Becker-Baldus
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Amy L. Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Mark E. Smith
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Siân A. Joyce
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Jonathan R. Yates
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Chris J. Pickard
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Ray Dupree
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| |
Collapse
|
24
|
Zhu J, Geris AJ, Wu G. Solid-state 17O NMR as a sensitive probe of keto and gem-diol forms of α-keto acid derivatives. Phys Chem Chem Phys 2009; 11:6972-80. [DOI: 10.1039/b906438a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
|
25
|
Yamada K, Shimizu T, Yamazaki T, Ohki S. Determination of the orientations for the 17O NMR tensors in a polycrystalline l-alanine hydrochloride. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 33:88-94. [PMID: 18524548 DOI: 10.1016/j.ssnmr.2008.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Indexed: 05/26/2023]
Abstract
We report a solid-state 17O NMR study of the 17O electric-field-gradient (EFG) and chemical shielding (CS) tensors for the carboxyl oxygen in an l-alanine hydrochloride. Using [17O]- and [13C,17O]-L-alanine hydrochlorides, both the magnitudes and the orientations in the molecular frame of the 17O EFG and CS tensors could be determined by the analysis of the 17O magic-angle spinning (MAS) and stationary NMR spectra. For the carbonyl oxygen, the smallest EFG tensor component, V(XX), and the largest EFG component, V(ZZ), roughly lies in the carboxyl molecular plane and the direction of V(XX) is parallel to the dipolar vector between 13C and 17O, that is, the direction of CO bond. The angles between the intermediate EFG component, VYY, and delta33 component, and between delta22 component and VZZ are found to be approximately 10 degrees and 35 degrees , respectively. We also present the results of the quantum chemical calculations for a theoretical hydrogen-bonding model, indicating that hydrogen-bonding strengths make it possible to vary both magnitudes and orientations of the carbonyl 17O EFG tensors in amino acid hydrochlorides.
Collapse
Affiliation(s)
- Kazuhiko Yamada
- National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
| | | | | | | |
Collapse
|
26
|
Wong A, Beevers AJ, Kukol A, Dupree R, Smith ME. Solid-state 17O NMR spectroscopy of a phospholemman transmembrane domain protein: implications for the limits of detecting dilute 17O sites in biomaterials. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 33:72-75. [PMID: 18502619 DOI: 10.1016/j.ssnmr.2008.04.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2008] [Indexed: 05/26/2023]
Abstract
The 17O-'diluted' glycine-14 sites in a phospholemman (PLM) transmembrane domain protein are characterized by solid-state 17O NMR spectroscopy. The PLM transmembrane domain is an alpha-helical tetramer unit of four 28-residue peptides and is rigidly embedded in a bilayer where each alpha-helix has an average tilt of 7.3 degrees against the membrane normal. The PLM sample investigated here consists of a high lipid/peptide molar ratio (25:1) with one glycine residue in each helix enriched to <40% (17)O; thus, this is a very dilute 17O-sample and is the most dilute 17O-membrane protein to date to be characterized by solid-state 17O NMR spectroscopy. Based on the spectral analysis of 17O magic angle spinning (MAS) at 14.1 and 18.8T, the PLM transmembrane domain protein consists of multiple crystallographic gly14 sites, suggesting that the tetramer protein is an asymmetric unit with either C2- or C1-rotational symmetry along the bilayer normal.
Collapse
Affiliation(s)
- Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK
| | | | | | | | | |
Collapse
|
27
|
Yamada K, Shimizu T, Yamazaki T, Sato A. A Solid-state17O NMR Study of β-Glycine: High Sensitivity of17O NMR Parameters to Hydrogen-bonding Interactions. CHEM LETT 2008. [DOI: 10.1246/cl.2008.472] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
28
|
Wylie BJ, Rienstra CM. Multidimensional solid state NMR of anisotropic interactions in peptides and proteins. J Chem Phys 2008; 128:052207. [PMID: 18266412 DOI: 10.1063/1.2834735] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Accurate determinations of chemical shift anisotropy (CSA) tensors are valuable for NMR of biological systems. In this review we describe recent developments in CSA measurement techniques and applications, particularly in the context of peptides and proteins. These techniques include goniometeric measurements of single crystals, slow magic-angle spinning studies of powder samples, and CSA recoupling under moderate to fast MAS. Experimental CSA data can be analyzed by comparison with ab initio calculations for structure determination and refinement. This approach has particularly high potential for aliphatic (13)C analysis, especially Calpha tensors which are directly related to structure. Carbonyl and (15)N CSA tensors demonstrate a more complex dependence upon hydrogen bonding and electrostatics, in addition to conformational dependence. The improved understanding of these tensors and the ability to measure them quantitatively provide additional opportunities for structure determination, as well as insights into dynamics.
Collapse
Affiliation(s)
- Benjamin J Wylie
- Department of Chemistry, Department of Biochemistry and Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA
| | | |
Collapse
|
29
|
Yamada K, Shimizu T, Ohki S, Yamazaki T. A solid-state 17O NMR study of L -phenylalanine and L -valine hydrochlorides. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:226-234. [PMID: 18236436 DOI: 10.1002/mrc.2167] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We have presented an experimental investigation of the oxygen-17 chemical shielding (CS) and electric-field-gradient (EFG) tensors for alpha-COOH groups in polycrystalline amino acid hydrochlorides. The 17O CS and EFG tensors including the relative orientations between the two NMR tensors are determined in [17O]-L-phenylalanine hydrochloride and [17O]-L-valine hydrochloride by the analysis of the 17O magic-angle-spinning (MAS) and stationary NMR spectra obtained at 9.4, 11.7, 16.4, and 21.8 T. The quadrupole coupling constants (CQ) and the span of the CS tensors are found to be 8.41-8.55 MHz and 7.35-7.41MHz, and 548-570 ppm and 225-231 ppm, for carbonyl and hydroxyl oxygen atoms, respectively. Extensive quantum chemical calculations using density functional theory (DFT) have been also carried out for a hydrogen-bonding model. It is demonstrated that the behavior of the dependence of hydrogen-bond distances on 17O NMR tensors for the halogen ions is different from those for the water molecule.
Collapse
Affiliation(s)
- Kazuhiko Yamada
- National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan.
| | | | | | | |
Collapse
|
30
|
Wu G, Mason P, Mo X, Terskikh V. Experimental and Computational Characterization of the 17O Quadrupole Coupling and Magnetic Shielding Tensors for p-Nitrobenzaldehyde and Formaldehyde. J Phys Chem A 2008; 112:1024-32. [DOI: 10.1021/jp077558e] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gang Wu
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Peter Mason
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Xin Mo
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Victor Terskikh
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6, and Steacie Institute for Molecular Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
| |
Collapse
|
31
|
Yamada K, Shimizu T, Asanuma M, Yamazaki T, Yokoyama S. Experimental determination of orientations for the 17 O electric-field-gradient and chemical shielding tensors in L-alanine. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 33:25-30. [PMID: 18055185 DOI: 10.1016/j.ssnmr.2007.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2007] [Revised: 10/19/2007] [Accepted: 10/26/2007] [Indexed: 05/25/2023]
Abstract
We have presented a solid-state 17 O NMR study of [13C, 17 O]-L-alanine. Using the experimental results for the 13C-17 O dipolar vector and Euler angles, the absolute orientations of 17 O chemical shielding (CS) and electric-field-gradient (EFG) tensors with respect to the molecular frame can be determined for L-alanine. The present results suggest that the intermediate EFG tensor components, VYY, lie in the carboxylate plane and parallel to the C-O bond directions, while the least shielded components, delta11, and the intermediate CS tensor components, delta22, roughly lie in the molecular plane and the direction of delta22 components are approximately 38 degrees and 25 degrees off the C-O bonds for O1 and O2, respectively. These results are in reasonable agreement with those of our quantum chemical calculations reported previously.
Collapse
Affiliation(s)
- Kazuhiko Yamada
- Tsukuba Magnet Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan.
| | | | | | | | | |
Collapse
|
32
|
De Gortari I, Galván M, Ireta J, Segall M, Pickard CJ, Payne M. Theoretical Investigations of Oxygen-17 NMR Chemical Shifts to Discriminate among Helical Forms. J Phys Chem A 2007; 111:13099-105. [DOI: 10.1021/jp0751817] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Itzam De Gortari
- TCM Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, A.P. 55-534, México 09340, and Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweb 4-6, D-14195 Berlin-Dahlem, Germany
| | - Marcelo Galván
- TCM Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, A.P. 55-534, México 09340, and Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweb 4-6, D-14195 Berlin-Dahlem, Germany
| | - Joel Ireta
- TCM Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, A.P. 55-534, México 09340, and Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweb 4-6, D-14195 Berlin-Dahlem, Germany
| | - Matthew Segall
- TCM Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, A.P. 55-534, México 09340, and Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweb 4-6, D-14195 Berlin-Dahlem, Germany
| | - Chris J. Pickard
- TCM Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, A.P. 55-534, México 09340, and Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweb 4-6, D-14195 Berlin-Dahlem, Germany
| | - Mike Payne
- TCM Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, A.P. 55-534, México 09340, and Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweb 4-6, D-14195 Berlin-Dahlem, Germany
| |
Collapse
|
33
|
Experimental determination of the carboxylate oxygen electric-field-gradient and chemical shielding tensors in l-alanine and l-phenylalanine. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.12.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
34
|
Chekmenev EY, Waddell KW, Hu J, Gan Z, Wittebort RJ, Cross TA. Ion-binding study by 17O solid-state NMR spectroscopy in the model peptide Gly-Gly-Gly at 19.6 T. J Am Chem Soc 2007; 128:9849-55. [PMID: 16866542 DOI: 10.1021/ja060191r] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Li(+) and Ca(2+) binding to the carbonyl oxygen sites of a model peptide system has been studied by (17)O solid-state NMR spectroscopy. (17)O chemical shift (CS) and quadrupole coupling (QC) tensors are determined in four Gly-(Gly-(17)O)-Gly polymorphs by a combination of stationary and fast magic-angle spinning (MAS) methods at high magnetic field, 19.6 T. In the crystal lattice, the carbonyl oxygen of the central glycyl residue in two gly-gly-gly polymorphs form intermolecular hydrogen bonds with amides, whereas the corresponding carbonyl oxygens of the other two polymorphs form interactions with Li(+) and Ca(2+) ions. This permits a comparison of perturbations on (17)O NMR properties by ion binding and intermolecular hydrogen bonding. High quality spectra are augmented by density functional theory (DFT) calculations on large molecular clusters to gain additional theoretical insights and to aid in the spectral simulations. Ion binding significantly decreases the two (17)O chemical shift tensor components in the peptide plane, delta(11) and delta(22), and, thus, a substantial change in the isotropic chemical shift. In addition, quadrupole coupling constants are decreased by up to 1 MHz. The effects of ion binding are found to be almost an order of magnitude greater than those induced by hydrogen bonding.
Collapse
Affiliation(s)
- Eduard Y Chekmenev
- NMR Program, National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, USA
| | | | | | | | | | | |
Collapse
|
35
|
Yamada K, Shimizu T, Tansho M, Nemoto T, Asanuma M, Yoshida M, Yamazaki T, Hirota H. Solid-state 17O NMR study of the electric-field-gradient and chemical shielding tensors in polycrystalline amino acids. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45:547-56. [PMID: 17534877 DOI: 10.1002/mrc.2002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We have presented a systematic experimental investigation of carboxyl oxygen electric-field-gradient (EFG) and chemical shielding (CS) tensors in crystalline amino acids. Three 17O-enriched amino acids were prepared: L-aspartic acid, L-threonine, and L-tyrosine. Analysis of two-dimensional 17O multiple-quantum magic-angle spinning (MQMAS), MAS, and stationary NMR spectra yields the 17O CS, EFG tensors and the relative orientations between the two tensors for the amino acids. The values of quadrupolar coupling constants (CQ) are found to be in the range of 6.70-7.60 MHz. The values of deltaiso lie in the range of 268-292 ppm, while those of the delta11 and delta22 components vary from 428 to 502 ppm, and from 303 to 338 ppm, respectively. There is a significant correlation between the magnitudes of delta22 components and C--O bond lengths. Since C--O bond length may be related to hydrogen-bonding environments, solid-state 17O NMR has significant potential to provide insights into important aspects of hydrogen bonds in biological systems.
Collapse
Affiliation(s)
- Kazuhiko Yamada
- RIKEN Genomic Sciences Center, 1-7-22 Suehiro, Tsurumi, Yokohama, 230-0045 Japan.
| | | | | | | | | | | | | | | |
Collapse
|
36
|
|
37
|
Yamada K, Yamazaki T, Asanuma M, Hirota H, Yamamoto N, Kajihara Y. Solid-state17O NMR in Biological Solids: Efficient17O Labeling of Amino Acids and Peptides. CHEM LETT 2007. [DOI: 10.1246/cl.2007.192] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
38
|
Brinkmann A, Kentgens APM. Proton-Selective17O−1H Distance Measurements in Fast Magic-Angle-Spinning Solid-State NMR Spectroscopy for the Determination of Hydrogen Bond Lengths. J Am Chem Soc 2006; 128:14758-9. [PMID: 17105257 DOI: 10.1021/ja065415k] [Citation(s) in RCA: 188] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a proton-selective method to determine 17O-1H distances in organic, biological, and biomimetic materials by fast magic-angle-spinning solid-state NMR spectroscopy. This method allows the determination of internuclear distances between specific (17O, 1H) spin pairs selectively. It enables the estimation of medium-range 17O...1H distances across hydrogen bonds in the presence of short-range 17O-1H contacts sharing the same 17O site. The method employs the newly developed symmetry-based radiofrequency pulse sequence SR%@mt;sys@%4%@sx@%1%@be@%2%@sxx@%%@mx@% applied to the protons to achieve heteronuclear dipolar recoupling, while simultaneously decoupling the homonuclear proton dipolar interactions. Fast MAS (50 kHz) and high static magnetic fields (18.8 T) achieve the required proton spectral resolution.
Collapse
Affiliation(s)
- Andreas Brinkmann
- Physical Chemistry/Solid State NMR, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands.
| | | |
Collapse
|
39
|
Yamada K, Nemoto T, Asanuma M, Honda H, Yamazaki T, Hirota H. Both experimental and theoretical investigations of solid-state 17O NMR for L-valine and L-isoleucine. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2006; 30:182-91. [PMID: 17074470 DOI: 10.1016/j.ssnmr.2006.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2006] [Accepted: 09/27/2006] [Indexed: 05/12/2023]
Abstract
We have presented an experimental investigation of the carboxyl oxygen NMR parameters for four distinct sites in l-valine and l-isoleucine. The carboxyl (17)O quadrupolar coupling constant, C(Q), and isotropic chemical shift, delta(iso), for these compounds are obtained by analyzing two-dimensional (17)O multiple-quantum magic-angle spinning (MQMAS) and/or 1D MAS spectra. The values of C(Q) and delta(iso) found to be in the range of 7.00-7.85 MHz, and 264-314 ppm, respectively. Extensive quantum chemical calculations at the density functional levels have been performed for a full cluster of l-valine molecules and a few theoretical models. The calculated results indicated that there was a correlation between the (17)O NMR parameters and C-O bond lengths, which was helpful for the spectral assignment. They also demonstrated that the torsion angle of l-valine plays an important role in determining the magnitudes of (17)O NMR parameters.
Collapse
Affiliation(s)
- Kazuhiko Yamada
- RIKEN Genomic Sciences Center, 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan.
| | | | | | | | | | | |
Collapse
|
40
|
Yamada K, Honda H, Yamazaki T, Yoshida M. Solid-state 17O NMR study of the electric-field-gradient and chemical shielding tensors in polycrystalline gamma-glycine. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2006; 30:162-70. [PMID: 17045787 DOI: 10.1016/j.ssnmr.2006.09.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2006] [Revised: 08/29/2006] [Accepted: 09/01/2006] [Indexed: 05/12/2023]
Abstract
We report the first experimental determination of the carboxylate oxygen electric-field-gradient (EFG) and chemical shielding (CS) tensors in polycrystalline gamma-glycine. Analysis of magic-angle spinning (MAS) and stationary (17)O NMR spectra of [(17)O]-gamma-glycine obtained at 9.4, 14.1, 16.4, and 18.8 T yields the magnitudes of the (17)O EFG and CS tensors and the relative orientations between the two tensors. Extensive quantum chemical calculations at both the restricted Hartree-Fock and density functional levels have been performed to present the absolute tensor orientations in term of the molecular frame. We have demonstrated that (17)O NMR tensor information could be unambiguously derived by the multiple field analyses of stationary (17)O NMR spectra.
Collapse
Affiliation(s)
- Kazuhiko Yamada
- NMR Spectroscopy Team, RIKEN Genomic Sciences Center, Tsurumi, Yokohama-shi, Kanagawa-ken 230-0045, Japan.
| | | | | | | |
Collapse
|
41
|
McLain SE, Soper AK, Watts A. Structural Studies on the Hydration of l-Glutamic Acid in Solution. J Phys Chem B 2006; 110:21251-8. [PMID: 17048953 DOI: 10.1021/jp062383e] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A combination of neutron diffraction augmented with isotopic substitution and computer modeling using empirical potential structure refinement has been used to extract detailed structural information for L-glutamic acid dissolved in 2 M NaOH solution. This work shows that the tetrahedral hydrogen bonding network in water is severely disrupted by the addition of glutamic acid and NaOH, with the number of water-water hydrogen bonds being reduced from 1.8 bonds per water molecule in pure water to 1.4 bonds per water molecule in the present solution. In the glutamic acid molecule, each carboxylate oxygen atom forms an average of three hydrogen bonds with the surrounding water solvent with one of these hydrogens being shared between the two oxygen atoms on each carboxylate group, while each amine hydrogen forms a single hydrogen bond with the surrounding water solvent. Additionally, the average conformation of the glutamic acid molecules in these solutions is extracted.
Collapse
Affiliation(s)
- Sylvia E McLain
- Rutherford Appleton Laboratory, ISIS Facility, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom.
| | | | | |
Collapse
|
42
|
Brinkmann A, Kentgens APM. Sensitivity Enhancement and Heteronuclear Distance Measurements in Biological 17O Solid-State NMR. J Phys Chem B 2006; 110:16089-101. [PMID: 16898766 DOI: 10.1021/jp062809p] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this contribution we present a comprehensive approach to study hydrogen bonding in biological and biomimetic systems through 17O and 17O-1H solid-state NMR combined with density functional theory calculations of 17O and 1H NMR parameters. We explore the signal enhancement of 17O in L-tyrosine.HCl using repetitive double-frequency swept radio frequency pulses in solid-state NMR. The technique is compatible with high magnetic fields and fast magic-angle spinning of the sample. A maximum enhancement by a factor of 4.3 is obtained in the signal-to-noise ratio of the selectively excited 17O central transition in a powdered sample of 17Oeta-L-tyrosine.HCl at an external field of 14.1 T and a spinning frequency of 25 kHz. As little as 128 transients lead to meaningful 17O spectra of the same sample at an external field of 18.8 T and a spinning frequency of 50 kHz. Furthermore we employed supercycled symmetry-based pulse sequences on the protons to achieve heteronuclear longitudinal two-spin-order (IzSz) recoupling to determine 17O-1H distances. These sequences recouple the heteronuclear dipolar 17O-1H couplings, where dipolar truncation is absent, while decoupling the homonuclear proton dipolar interactions. They can be applied at fast magic-angle-spinning frequencies up and beyond 50 kHz and are very robust with respect to 17O quadrupolar couplings and both 17O and 1H chemical shift anisotropies, which makes them suitable for the use at high external magnetic fields. The method is demonstrated by determining the 17Oeta-1H distance in L-tyrosine.HCl at a spinning frequency of 50 kHz and an external field of 18.8 T.
Collapse
Affiliation(s)
- Andreas Brinkmann
- Physical Chemistry/Solid State NMR, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands.
| | | |
Collapse
|
43
|
Killian JA, Nyholm TKM. Peptides in lipid bilayers: the power of simple models. Curr Opin Struct Biol 2006; 16:473-9. [PMID: 16828281 DOI: 10.1016/j.sbi.2006.06.007] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2006] [Revised: 06/07/2006] [Accepted: 06/26/2006] [Indexed: 02/05/2023]
Abstract
Interactions between proteins and lipids lie at the heart of virtually all membrane processes, but on a molecular level they are still poorly understood. Nowadays, simple model systems comprising designed transmembrane peptides in synthetic lipid bilayers are increasingly being recognized as powerful tools to uncover basic principles of protein-lipid interactions. Such model systems enable detailed analysis of how the properties of lipids influence the structure and dynamics of transmembrane helices, how these helices are anchored at the lipid-water interface, and how the length and composition of transmembrane segments influence the organization and dynamics of membrane lipids. In addition, well-characterized model systems have proven useful to refine computational approaches and to develop new techniques for studies of protein-lipid interactions.
Collapse
Affiliation(s)
- J Antoinette Killian
- Biochemistry of Membranes, Bijvoetcenter and Institute of Biomembranes, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
| | | |
Collapse
|
44
|
Wong A, Howes AP, Pike KJ, Lemaître V, Watts A, Anupõld T, Past J, Samoson A, Dupree R, Smith ME. New Limits for Solid-State 17O NMR Spectroscopy: Complete Resolution of Multiple Oxygen Sites in a Simple Biomolecule. J Am Chem Soc 2006; 128:7744-5. [PMID: 16771481 DOI: 10.1021/ja062031l] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A solid-state 17O NMR 1H-decoupled double angle rotation (DOR) study of monosodium l-glutamate monohydrate (l-MSG) is reported. It is shown that all eight inequivalent sites can be resolved with DOR line widths ( approximately 65 Hz) approximately 120 times narrower than those in the MAS spectrum. The lines are tentatively assigned on the basis of their behavior under proton decoupling and the isotropic chemical shift and the quadrupole interaction parameter for each extracted by a combination of DOR and 3Q MAS at variable magnetic fields. With a shift range of approximately 45 ppm for these similar oxygen sites and spectral resolution under DOR comparable to that for spin-1/2 nuclei, solid-state 17O NMR should have tremendous potential in the study of biomolecules.
Collapse
Affiliation(s)
- Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
| | | | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Howes A, Anupõld T, Lemaitre V, Kukol A, Watts A, Samoson A, Smith M, Dupree R. Enhancing resolution and sensitivity of 17O solid-state NMR through combining double rotation, 1H decoupling and satellite modulation for biomolecular applications. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.01.061] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
46
|
Prasad S, Clark TM, Sharma R, Kwak HT, Grandinetti PJ, Zimmermann H. A combined 17O RAPT and MQ-MAS NMR study of L-leucine. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2006; 29:119-24. [PMID: 16293400 DOI: 10.1016/j.ssnmr.2005.10.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2005] [Revised: 10/04/2005] [Indexed: 05/05/2023]
Abstract
We report the application of rotor-assisted population transfer (RAPT) to measure the quadrupolar coupling constant (C(q)) for spin 5/2 nuclei. Results from numerical simulations are presented on the magnitude of enhancement factor as a function of frequency offsets, i.e. the RAPT profile. Experimental O17 RAPT profile is traced for the amino acid L-leucine. In addition, results from MQ-MAS experiments are incorporated to determine the quadrupolar asymmetry parameter (eta(q)). Unlike previous reports, the O17 NMR parameters for an amino acid, L-leucine, is reported at a relatively low field of 9.4 T.
Collapse
Affiliation(s)
- Subramanian Prasad
- Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA
| | | | | | | | | | | |
Collapse
|
47
|
Wong A, Pike KJ, Jenkins R, Clarkson GJ, Anupõld T, Howes AP, Crout DHG, Samoson A, Dupree R, Smith ME. Experimental and Theoretical 17O NMR Study of the Influence of Hydrogen-Bonding on CO and O−H Oxygens in Carboxylic Solids. J Phys Chem A 2006; 110:1824-35. [PMID: 16451014 DOI: 10.1021/jp055807y] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A systematic solid-state 17O NMR study of a series of carboxylic compounds, maleic acid, chloromaleic acid, KH maleate, KH chloromaleate, K2 chloromaleate, and LiH phthalate.MeOH, is reported. Magic-angle spinning (MAS), triple-quantum (3Q) MAS, and double angle rotation (DOR) 17O NMR spectra were recorded at high magnetic fields (14.1 and 18.8 T). 17O MAS NMR for metal-free carboxylic acids and metal-containing carboxylic salts show featured spectra and demonstrate that this combined, where necessary, with DOR and 3QMAS, can yield site-specific information for samples containing multiple oxygen sites. In addition to 17O NMR spectroscopy, extensive quantum mechanical calculations were carried out to explore the influence of hydrogen bonding at these oxygen sites. B3LYP/6-311G++(d,p) calculations of 17O NMR parameters yielded good agreement with the experimental values. Linear correlations are observed between the calculated 17O NMR parameters and the hydrogen bond strengths, suggesting the possibility of estimating H-bonding information from 17O NMR data. The calculations also revealed intermolecular H-bond effects on the 17O NMR shielding tensors. It is found that the delta11 and delta22 components of the chemical shift tensor at O-H and C=O, respectively, are aligned nearly parallel with the strong H-bond and shift away from this direction as the H-bond interaction weakens.
Collapse
Affiliation(s)
- Alan Wong
- Department of Physics, University of Warwick, Coventry, CV4 7AL, U. K
| | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Hu J, Chekmenev EY, Gan Z, Gor'kov PL, Saha S, Brey WW, Cross TA. Ion solvation by channel carbonyls characterized by 17O solid-state NMR at 21 T. J Am Chem Soc 2005; 127:11922-3. [PMID: 16117514 DOI: 10.1021/ja0535413] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Recently available ultrahigh magnetic fields offer new opportunities for studies of quadrupole nuclei in biological solids because of the dramatic enhancement in sensitivity and resolution associated with the reduction of second-order quadrupole interactions. Here, we present a new approach for understanding the function and energetics of ion solvation in channels using solid-state 17O NMR spectroscopy of single-site 17O-labeled gramicidin A. The chemical shift and quadrupole coupling parameters obtained in powder samples of lyophilized material are similar to those shown in the literature for carbonyl oxygens. In lipid bilayers, it is found that the carbonyl 17O anisotropic chemical shift of Leu10, one of the three carbonyl oxygens contributing to the ion binding site in gramicidin A, is altered by 40 ppm when K+ ion binds to the channel, demonstrating a high sensitivity to such interactions. Moreover, considering the large breadth of the carbonyl 17O chemical shift (>500 ppm), the recording of anisotropic 17O chemical shifts in bilayers aligned with respect to magnetic field B0 offers high-quality structural restraints similar to 15N and 13C anisotropic chemical shifts.
Collapse
Affiliation(s)
- Jun Hu
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA
| | | | | | | | | | | | | |
Collapse
|
49
|
Ida R, De Clerk M, Wu G. Influence of N−H···O and C−H···O Hydrogen Bonds on the 17O NMR Tensors in Crystalline Uracil: Computational Study. J Phys Chem A 2005; 110:1065-71. [PMID: 16420009 DOI: 10.1021/jp0554947] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We report a computational study for the 17O NMR tensors (electric field gradient and chemical shielding tensors) in crystalline uracil. We found that N-H...O and C-H...O hydrogen bonds around the uracil molecule in the crystal lattice have quite different influences on the 17O NMR tensors for the two C=O groups. The computed 17O NMR tensors on O4, which is involved in two strong N-H...O hydrogen bonds, show remarkable sensitivity toward the choice of cluster model, whereas the 17O NMR tensors on O2, which is involved in two weak C-H...O hydrogen bonds, show much smaller improvement when the cluster model includes the C-H...O hydrogen bonds. Our results demonstrate that it is important to have accurate hydrogen atom positions in the molecular models used for 17O NMR tensor calculations. In the absence of low-temperature neutron diffraction data, an effective way to generate reliable hydrogen atom positions in the molecular cluster model is to employ partial geometry optimization for hydrogen atom positions using a cluster model that includes all neighboring hydrogen-bonded molecules. Using an optimized seven-molecule model (a total of 84 atoms), we were able to reproduce the experimental 17O NMR tensors to a reasonably good degree of accuracy. However, we also found that the accuracy for the calculated 17O NMR tensors at O2 is not as good as that found for the corresponding tensors at O4. In particular, at the B3LYP/6-311++G(d,p) level of theory, the individual 17O chemical shielding tensor components differ by less than 10 and 30 ppm from the experimental values for O4 and O2, respectively. For the 17O quadrupole coupling constant, the calculated values differ by 0.30 and 0.87 MHz from the experimental values for O4 and O2, respectively.
Collapse
Affiliation(s)
- Ramsey Ida
- Department of Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6
| | | | | |
Collapse
|