51
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Bagno A, Bonchio M, Sartorel A, Scorrano G. Relativistic DFT calculations of polyoxotungstate 183W NMR spectra: insight into their solution structure. Chemphyschem 2003; 4:517-9. [PMID: 12785270 DOI: 10.1002/cphc.200300636] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Alessandro Bagno
- Dipartimento di Chimica Organica, Università di Padova via Marzolo 1, 35131 Padova, Italy.
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52
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Fukuda R, Hada M, Nakatsuji H. Quasirelativistic theory for magnetic shielding constants. II. Gauge-including atomic orbitals and applications to molecules. J Chem Phys 2003. [DOI: 10.1063/1.1528934] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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53
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Schreckenbach G. NMR shielding calculations across the periodic table: diamagnetic uranium compounds. 2. Ligand and metal NMR. Inorg Chem 2002; 41:6560-72. [PMID: 12470051 DOI: 10.1021/ic020370j] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this and a previous article (J. Phys. Chem. A 2000, 104, 8244), the range of application for relativistic density functional theory (DFT) is extended to the calculation of nuclear magnetic resonance (NMR) shieldings and chemical shifts in diamagnetic actinide compounds. Two relativistic DFT methods are used, ZORA ("zeroth-order regular approximation") and the quasirelativistic (QR) method. In the given second paper, NMR shieldings and chemical shifts are calculated and discussed for a wide range of compounds. The molecules studied comprise uranyl complexes, [UO(2)L(n)](+/-)(q); UF(6); inorganic UF(6) derivatives, UF(6-n)Cl(n), n = 0-6; and organometallic UF(6) derivatives, UF(6-n)(OCH(3))(n), n = 0-5. Uranyl complexes include [UO(2)F(4)](2-), [UO(2)Cl(4)](2-), [UO(2)(OH)(4)](2-), [UO(2)(CO(3))(3)](4-), and [UO(2)(H(2)O)(5)](2+). For the ligand NMR, moderate (e.g., (19)F NMR chemical shifts in UF(6-n)Cl(n)) to excellent agreement [e.g., (19)F chemical shift tensor in UF(6) or (1)H NMR in UF(6-n)(OCH(3))(n)] has been found between theory and experiment. The methods have been used to calculate the experimentally unknown (235)U NMR chemical shifts. A large chemical shift range of at least 21,000 ppm has been predicted for the (235)U nucleus. ZORA spin-orbit appears to be the most accurate method for predicting actinide metal chemical shifts. Trends in the (235)U NMR chemical shifts of UF(6-n)L(n) molecules are analyzed and explained in terms of the calculated electronic structure. It is argued that the energy separation and interaction between occupied and virtual orbitals with f-character are the determining factors.
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Affiliation(s)
- Georg Schreckenbach
- Theoretical Division (MS B268) and Seaborg Institute for Transactinium Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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54
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Fukui H, Baba T. Calculation of nuclear magnetic shieldings. XV. Ab initio zeroth-order regular approximation method. J Chem Phys 2002. [DOI: 10.1063/1.1510118] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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55
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Webster CE, Hall MB. Factors affecting the structure of substituted tris(pyrazolyl)borate rhodium dicarbonyl complexes. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(01)00826-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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56
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Vivas-Reyes R, De Proft F, Biesemans M, Willem R, Geerlings P. DFT Calculations of 119Sn Chemical Shifts Using Gauge-Including Atomic Orbitals and Their Interpretation via Group Properties. J Phys Chem A 2002. [DOI: 10.1021/jp0145917] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ricardo Vivas-Reyes
- Eenheid Algemene Chemie, Faculteit Wetenschappen, and High-Resolution NMR Centre, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Frank De Proft
- Eenheid Algemene Chemie, Faculteit Wetenschappen, and High-Resolution NMR Centre, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Monique Biesemans
- Eenheid Algemene Chemie, Faculteit Wetenschappen, and High-Resolution NMR Centre, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Rudolph Willem
- Eenheid Algemene Chemie, Faculteit Wetenschappen, and High-Resolution NMR Centre, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Paul Geerlings
- Eenheid Algemene Chemie, Faculteit Wetenschappen, and High-Resolution NMR Centre, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
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57
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Piana S, Sebastiani D, Carloni P, Parrinello M. Ab initio molecular dynamics-based assignment of the protonation state of pepstatin A/HIV-1 protease cleavage site. J Am Chem Soc 2001; 123:8730-7. [PMID: 11535077 DOI: 10.1021/ja003145e] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A recent 13C NMR experiment (Smith et al. Nature Struct. Biol. 1996, 3, 946-950) on the Asp 25-Asp25' dyad in pepstatin A/HIV-1 protease measured two separate resonance lines, which were interpreted as being a singly protonated dyad. We address this issue by performing ab initio molecular dynamics calculations on models for this site accompanied by calculations of 13C NMR chemical shifts and isotopic shifts. We find that already on the picosecond time-scale the model proposed by Smith et al. is not stable and evolves toward a different monoprotonated form whose NMR pattern differs from the experimental one. We suggest, instead, a different protonation state in which both aspartic groups are protonated. Despite the symmetric protonation state, the calculated 13C NMR properties are in good agreement with the experiment. We rationalize this result using a simple valence bond model, which explains the chemical inequality of the two C sites. The model calculations, together with our calculations on the complex, allow also the rationalization of 13C NMR properties on other HIV-1 PR/inhibitor complexes. Both putative binding of the substrate to the free enzyme, which has the dyad singly protonated (Piana, S.; Carloni, P. Proteins: Struct., Funct., Genet. 2000, 39, 26-36), and pepstatin A binding to the diprotonated form are consistent with the inverse solvent isotope effect on the onset of inhibition of pepsin by pepstatin and the kinetic iso-mechanism proposed for aspartic proteases (Cho, T.-K.; Rebholz, K.; Northrop, D.B. Biochemistry 1994, 33, 9637-9642).
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Affiliation(s)
- S Piana
- Scuola Internazionale Superiore di Studi Avanzati and Istituto Nazionale di Fisica della Materia, Via Beirut 2-4, 34014 Trieste, Italy
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58
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Hada M, Wan J, Fukuda R, Nakatsuji H. Quasirelativistic study of125Te nuclear magnetic shielding constants and chemical shifts. J Comput Chem 2001. [DOI: 10.1002/jcc.1103] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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59
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Wan J, Fukuda R, Hada M, Nakatsuji H. Quasi-Relativistic Study of 199Hg Nuclear Magnetic Shielding Constants of Dimethylmercury, Disilylmercury and Digermylmercury. J Phys Chem A 2000. [DOI: 10.1021/jp000517x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jian Wan
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ryoichi Fukuda
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masahiko Hada
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroshi Nakatsuji
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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60
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Schreckenbach G, Wolff SK, Ziegler T. NMR Shielding Calculations across the Periodic Table: Diamagnetic Uranium Compounds. 1. Methods and Issues. J Phys Chem A 2000. [DOI: 10.1021/jp001143a] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Georg Schreckenbach
- Theoretical Division (MS B268) and Seaborg Institute for Transactinium Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Scientific Computing and Modeling NV, Vrije Universiteit Theoretical Chemistry, De Boolelaan 1083, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
| | - Stephen K. Wolff
- Theoretical Division (MS B268) and Seaborg Institute for Transactinium Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Scientific Computing and Modeling NV, Vrije Universiteit Theoretical Chemistry, De Boolelaan 1083, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
| | - Tom Ziegler
- Theoretical Division (MS B268) and Seaborg Institute for Transactinium Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Scientific Computing and Modeling NV, Vrije Universiteit Theoretical Chemistry, De Boolelaan 1083, 1081 HV Amsterdam, The Netherlands, and Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
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61
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San Fabián J, Casanueva J, San Fabián E, Guilleme J. MCSCF calculations of NMR spin–spin coupling constant of the HF molecule. J Chem Phys 2000. [DOI: 10.1063/1.480996] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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