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Terban MW, Billinge SJL. Structural Analysis of Molecular Materials Using the Pair Distribution Function. Chem Rev 2022; 122:1208-1272. [PMID: 34788012 PMCID: PMC8759070 DOI: 10.1021/acs.chemrev.1c00237] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Indexed: 12/16/2022]
Abstract
This is a review of atomic pair distribution function (PDF) analysis as applied to the study of molecular materials. The PDF method is a powerful approach to study short- and intermediate-range order in materials on the nanoscale. It may be obtained from total scattering measurements using X-rays, neutrons, or electrons, and it provides structural details when defects, disorder, or structural ambiguities obscure their elucidation directly in reciprocal space. While its uses in the study of inorganic crystals, glasses, and nanomaterials have been recently highlighted, significant progress has also been made in its application to molecular materials such as carbons, pharmaceuticals, polymers, liquids, coordination compounds, composites, and more. Here, an overview of applications toward a wide variety of molecular compounds (organic and inorganic) and systems with molecular components is presented. We then present pedagogical descriptions and tips for further implementation. Successful utilization of the method requires an interdisciplinary consolidation of material preparation, high quality scattering experimentation, data processing, model formulation, and attentive scrutiny of the results. It is hoped that this article will provide a useful reference to practitioners for PDF applications in a wide realm of molecular sciences, and help new practitioners to get started with this technique.
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Affiliation(s)
- Maxwell W. Terban
- Max
Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Simon J. L. Billinge
- Department
of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
- Condensed
Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States
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2
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Gao M, Lu H, Song R, Ye L, Zhang A, Feng Z. Synthesis and Characterization of Polyrotaxanes Comprising γ‐CDs and Distal Azide‐Terminated PHEMA Using Propargylamine Monosubstituted β‐CDs as End Stoppers. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Ming Gao
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Hang Lu
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Rong‐Hao Song
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Lin Ye
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Ai‐Ying Zhang
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Zeng‐Guo Feng
- Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
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3
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Baltisberger JH, Florian P, Keeler EG, Phyo PA, Sanders KJ, Grandinetti PJ. Modifier cation effects on (29)Si nuclear shielding anisotropies in silicate glasses. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 268:95-106. [PMID: 27187210 DOI: 10.1016/j.jmr.2016.05.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 04/29/2016] [Accepted: 05/08/2016] [Indexed: 05/06/2023]
Abstract
We have examined variations in the (29)Si nuclear shielding tensor parameters of SiO4 tetrahedra in a series of seven alkali and alkaline earth silicate glass compositions, Cs2O·4.81 SiO2, Rb2O·3.96 SiO2, Rb2O·2.25 SiO2, K2O·4.48 SiO2, Na2O·4.74 SiO2, BaO·2.64 SiO2, and SrO·2.36 SiO2, using natural abundance (29)Si two-dimensional magic-angle flipping (MAF) experiments. Our analyses of these 2D spectra reveal a linear dependence of the (29)Si nuclear shielding anisotropy of Q((3)) sites on the Si-non-bridging oxygen bond length, which in turn depends on the cation potential and coordination of modifier cations to the non-bridging oxygen. We also demonstrate how a combination of Cu(2+) as a paramagnetic dopant combined with echo train acquisition can reduce the total experiment time of (29)Si 2D NMR measurements by two orders of magnitude, enabling higher throughput 2D NMR studies of glass structure.
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Affiliation(s)
- Jay H Baltisberger
- Division of Natural Science, Mathematics, and Nursing, Berea College, Berea, KY 40403, United States
| | - Pierre Florian
- CNRS, UPR3079 CEMHTI, 1D Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
| | - Eric G Keeler
- Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
| | - Pyae A Phyo
- Division of Natural Science, Mathematics, and Nursing, Berea College, Berea, KY 40403, United States
| | - Kevin J Sanders
- Institut des Sciences Analytiques (CNRS, ENS de Lyon, UCB Lyon 1), Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France
| | - Philip J Grandinetti
- Department of Chemistry, The Ohio State University, 120 W. 18(th) Avenue, Columbus, OH 43210-1173, United States.
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4
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Roy A, Dutta R, Kundu N, Banik D, Sarkar N. A Comparative Study of the Influence of Sugars Sucrose, Trehalose, and Maltose on the Hydration and Diffusion of DMPC Lipid Bilayer at Complete Hydration: Investigation of Structural and Spectroscopic Aspect of Lipid-Sugar Interaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5124-5134. [PMID: 27133799 DOI: 10.1021/acs.langmuir.6b01115] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It is well-known that sugars protect membrane structures against fusion and leakage. Here, we have investigated the interaction between different sugars (sucrose, trehalose, and maltose) and phospholipid membrane of 1,2-dimyristoyl-sn-glycero-3-phoshpocholine (DMPC) using dynamic light scattering (DLS), transmission electron microscopy (TEM), and other various spectroscopic techniques. DLS measurement reveals that the addition of sugar molecule results a significant increase of the average diameter of DMPC membrane. We have also noticed that in the presence of different sugars the rotational relaxation and solvation time of coumarin 480 (C480) and coumarin 153 (C153) surrounding DMPC membrane increases, suggesting a marked reduction of the hydration behavior at the surface of phospholipid membrane. In addition, we have also investigated the effect of sugar molecules on the lateral mobility of phospholipids. Interestingly, the relative increase in rotational, solvation and lateral diffusion is more prominent for C480 than that of C153 because of their different location in lipid bilayer. It is because of preferential location of comparatively hydrophilic probe C480 in the interfacial region of the lipid bilayer. Sugars intercalate with the phospholipid headgroup through hydrogen bonding and replace smaller sized water molecules from the membrane surface. Therefore, overall, we have monitored a comparative analysis regarding the interaction of different sugar molecules (sucrose, trehalose, and maltose) with the DMPC membrane through DLS, TEM, solvation dynamics, time-resolved anisotropy, and fluorescence correlation spectroscopy (FCS) measurements to explore the structural and spectroscopic aspect of lipid-sugar interaction.
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Affiliation(s)
- Arpita Roy
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Rupam Dutta
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
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5
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Ubbink J. Structural and thermodynamic aspects of plasticization and antiplasticization in glassy encapsulation and biostabilization matrices. Adv Drug Deliv Rev 2016; 100:10-26. [PMID: 26748258 DOI: 10.1016/j.addr.2015.12.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Revised: 12/22/2015] [Accepted: 12/23/2015] [Indexed: 01/21/2023]
Abstract
The structural and thermodynamic properties of glassy carbohydrate matrices for the encapsulation and biostabilization of sensitive bioactive compounds, such as pharmaceutically active proteins and oxidation-sensitive compounds, are reviewed in the context of the plasticization and antiplasticization of glassy carbohydrates of intermediate and high molecular weight by low molecular weight diluents. Plasticization and antiplasticization may be monitored either by dynamic measures or by structural and thermodynamic features of the glassy matrices. Specifically, it is demonstrated that the decrease in size of the molecular free volume holes with increasing diluent content, as determined by positron annihilation lifetime spectroscopy (PALS), is related to the antiplasticization of glassy carbohydrate matrices, resulting in increased barrier properties of the glassy matrix. As far as could be ascertained from the available data, the regimes as identified by PALS map on those detected by neutron scattering and dielectric spectroscopy for glassy matrices consisting of trehalose and the diluent glycerol. The review is concluded by a survey of the published results on the stability of bioactive compounds encapsulated in carbohydrate glasses and an overview of outstanding questions.
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Roy A, Kundu N, Banik D, Sarkar N. Comparative Fluorescence Resonance Energy-Transfer Study in Pluronic Triblock Copolymer Micelle and Niosome Composed of Biological Component Cholesterol: An Investigation of Effect of Cholesterol and Sucrose on the FRET Parameters. J Phys Chem B 2015; 120:131-42. [PMID: 26672631 DOI: 10.1021/acs.jpcb.5b09761] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arpita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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7
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Bukowicki J, Wawer A, Paradowska K. Conformational Analysis of Gentiobiose Using Genetic Algorithm Search and GIAO DFT Calculations with13C CPMAS NMR as a Verification Method. J Carbohydr Chem 2015. [DOI: 10.1080/07328303.2015.1016230] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Garay PG, Martin OA, Scheraga HA, Vila JA. Factors affecting the computation of the 13C shielding in disaccharides. J Comput Chem 2014; 35:1854-64. [PMID: 25066622 PMCID: PMC4383045 DOI: 10.1002/jcc.23697] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 06/09/2014] [Accepted: 07/06/2014] [Indexed: 11/06/2022]
Abstract
Knowledge of the three-dimensional structures of glycans and glycoproteins is useful for a full understanding of molecular processes in which glycans are involved, such as antigen-recognition and virus infection, to name a few. Among the ubiquitous nuclei in glycan molecules, the (13)C nucleus is an attractive candidate for computation of theoretical chemical shifts at the quantum chemical level of theory to validate and determine glycan structures. For this purpose, it is important to determine, first, which carbons can be used as probes to sense conformational changes and, second, all factors that affect the computation of the shielding, at the density functional theory (DFT) level of theory, of those carbons. To answer such questions, we performed a series of analyses on low-energy conformations, obtained by sampling the glycosidic torsional angles (ϕ, ψ) every 10°, of 12 disaccharides. Our results provide evidence that: (i) the carbons that participate in the glycosidic linkage are the most sensitive probes with which to sense conformational changes of disaccharides; (ii) the rotation of the hydroxyl groups closest to the glycosidic linkage significantly affects the computation of the shieldings of the carbons that participate in the glycosidic linkage; (iii) it is not possible to obtain the shieldings of one disaccharide from the computed values of a different disaccharide or from those disaccharides that differ in the anomeric state; and (iv) a proper basis set distribution, a functional, and a step size, with which to sample the conformational space, are necessary to compute shieldings accurately and rapidly.
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Affiliation(s)
- Pablo G. Garay
- IMASL-CONICET, Universidad Nacional de San Luis, Italia 1556, 5700-San Luis, Argentina
| | - Osvaldo A. Martin
- IMASL-CONICET, Universidad Nacional de San Luis, Italia 1556, 5700-San Luis, Argentina
- Baker Laboratory of Chemistry, Cornell University, Ithaca, New York
| | | | - Jorge A. Vila
- IMASL-CONICET, Universidad Nacional de San Luis, Italia 1556, 5700-San Luis, Argentina
- Baker Laboratory of Chemistry, Cornell University, Ithaca, New York
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9
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Nunes TG, Viciosa MT, Correia NT, Danède F, Nunes RG, Diogo HP. A Stable Amorphous Statin: Solid-State NMR and Dielectric Studies on Dynamic Heterogeneity of Simvastatin. Mol Pharm 2014; 11:727-37. [DOI: 10.1021/mp400455r] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Natália T. Correia
- Unité
Matériaux et Transformation (UMET), UMR CNRS 8207, UFR de Physique,
BAT P5, Université Lille 1, 59655 Villeneuve
d’Ascq, France
- REQUIMTE/CQFB,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - F. Danède
- Unité
Matériaux et Transformation (UMET), UMR CNRS 8207, UFR de Physique,
BAT P5, Université Lille 1, 59655 Villeneuve
d’Ascq, France
| | - Rita G. Nunes
- Instituto
de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
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10
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Pyszczynski SJ, Munson EJ. Generation and Characterization of a New Solid Form of Trehalose. Mol Pharm 2013; 10:3323-32. [DOI: 10.1021/mp400104b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Sarah J. Pyszczynski
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, Kentucky 40536, United States
- Department of Pharmaceutical
Chemistry, University of Kansas, Lawrence,
Kansas 66047, United States
| | - Eric J. Munson
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, Kentucky 40536, United States
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11
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Koito Y, Yamada K, Ando S. Solid-state NMR and wide-angle X-ray diffraction study of hydrofluoroether/β-cyclodextrin inclusion complex. J INCL PHENOM MACRO 2012. [DOI: 10.1007/s10847-012-0183-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Caron V, Willart JF, Lefort R, Derollez P, Danède F, Descamps M. Solid state amorphization kinetic of alpha lactose upon mechanical milling. Carbohydr Res 2011; 346:2622-8. [PMID: 21983262 DOI: 10.1016/j.carres.2011.09.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 08/18/2011] [Accepted: 09/06/2011] [Indexed: 11/26/2022]
Abstract
It has been previously reported that α-lactose could be totally amorphized by ball milling. In this paper we report a detailed investigation of the structural and microstructural changes by which this solid state amorphization takes place. The investigations have been performed by Powder X-ray Diffraction, Solid State Nuclear Magnetic Resonance ((13)C CP-MAS) and Differential Scanning Calorimetry. The results reveal the structural complexity of the material in the course of its amorphization so that it cannot be considered as a simple mixture made of a decreasing crystalline fraction and an increasing amorphous fraction. Heating this complexity can give rise to a fully nano-crystalline material. The results also show that chemical degradations upon heating are strongly connected to the melting process.
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Affiliation(s)
- Vincent Caron
- UMET, UMR CNRS 8207, Université Lille Nord de France, F-59650 Villeneuve d'Ascq, France
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13
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Nunes TG, Diogo HP, Pinto SS, Moura Ramos JJ. Molecular Dynamics of Amorphous Gentiobiose Studied by Solid-State NMR. J Phys Chem B 2010; 114:15976-84. [DOI: 10.1021/jp106371w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Teresa G. Nunes
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
| | - Hermínio P. Diogo
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
| | - Susana S. Pinto
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
| | - Joaquim J. Moura Ramos
- Centro de Química Estrutural, Complexo I, IST, TULisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal, and CQFM (Centro de Química-Física Molecular) and IN (Institute of Nanoscience and Nanotechnology), Instituto Superior Técnico, TULisbon, 1049-001 Lisboa, Portugal
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14
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Perić-Hassler L, Hansen HS, Baron R, Hünenberger PH. Conformational properties of glucose-based disaccharides investigated using molecular dynamics simulations with local elevation umbrella sampling. Carbohydr Res 2010; 345:1781-801. [PMID: 20576257 DOI: 10.1016/j.carres.2010.05.026] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Revised: 05/20/2010] [Accepted: 05/22/2010] [Indexed: 10/19/2022]
Abstract
Explicit-solvent molecular dynamics (MD) simulations of the 11 glucose-based disaccharides in water at 300K and 1bar are reported. The simulations were carried out with the GROMOS 45A4 force-field and the sampling along the glycosidic dihedral angles phi and psi was artificially enhanced using the local elevation umbrella sampling (LEUS) method. The trajectories are analyzed in terms of free-energy maps, stable and metastable conformational states (relative free energies and estimated transition timescales), intramolecular H-bonds, single molecule configurational entropies, and agreement with experimental data. All disaccharides considered are found to be characterized either by a single stable (overwhelmingly populated) state ((1-->n)-linked disaccharides with n=1, 2, 3, or 4) or by two stable (comparably populated and differing in the third glycosidic dihedral angle omega ; gg or gt) states with a low interconversion barrier ((1-->6)-linked disaccharides). Metastable (anti-phi or anti-psi) states are also identified with relative free energies in the range of 8-22 kJ mol(-1). The 11 compounds can be classified into four families: (i) the alpha(1-->1)alpha-linked disaccharide trehalose (axial-axial linkage) presents no metastable state, the lowest configurational entropy, and no intramolecular H-bonds; (ii) the four alpha(1-->n)-linked disaccharides (n=1, 2, 3, or 4; axial-equatorial linkage) present one metastable (anti-psi) state, an intermediate configurational entropy, and two alternative intramolecular H-bonds; (iii) the four beta(1-->n)-linked disaccharides (n=1, 2, 3, or 4; equatorial-equatorial linkage) present two metastable (anti-phi and anti-psi) states, an intermediate configurational entropy, and one intramolecular H-bond; (iv) the two (1-->6)-linked disaccharides (additional glycosidic dihedral angle) present no (isomaltose) or a pair of (gentiobiose) metastable (anti-phi) states, the highest configurational entropy, and no intramolecular H-bonds. The observed conformational preferences appear to be dictated by four main driving forces (ring conformational preferences, exo-anomeric effect, steric constraints, and possible presence of a third glycosidic dihedral angle), leaving a secondary role to intramolecular H-bonding and specific solvation effects. In spite of the weak conformational driving force attributed to solvent-exposed H-bonds in water (highly polar protic solvent), intramolecular H-bonds may still have a significant influence on the physico-chemical properties of the disaccharide by decreasing its hydrophilicity. Along with previous work, the results also complete the suggestion of a spectrum of approximate transition timescales for carbohydrates up to the disaccharide level, namely: approximately 30 ps (hydroxyl groups), approximately 1 ns (free lactol group, free hydroxymethyl groups, glycosidic dihedral angleomega in (1-->6)-linked disaccharides), approximately 10 ns to 2 micros (ring conformation, glycosidic dihedral angles phi and psi). The calculated average values of the glycosidic torsional angles agree well with the available experimental data, providing validation for the force-field and simulation methodology employed.
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Affiliation(s)
- Lovorka Perić-Hassler
- Laboratory of Physical Chemistry, ETH Zürich, ETH Hönggerberg, HCI, CH-8093 Zürich, Switzerland
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15
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Webber AL, Elena B, Griffin JM, Yates JR, Pham TN, Mauri F, Pickard CJ, Gil AM, Stein R, Lesage A, Emsley L, Brown SP. Complete (1)H resonance assignment of beta-maltose from (1)H-(1)H DQ-SQ CRAMPS and (1)H (DQ-DUMBO)-(13)C SQ refocused INEPT 2D solid-state NMR spectra and first principles GIPAW calculations. Phys Chem Chem Phys 2010; 12:6970-83. [PMID: 20480118 DOI: 10.1039/c001290d] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A disaccharide is a challenging case for high-resolution (1)H solid-state NMR because of the 24 distinct protons (14 aliphatic and 10 OH) having (1)H chemical shifts that all fall within a narrow range of approximately 3 to 7 ppm. High-resolution (1)H (500 MHz) double-quantum (DQ) combined rotation and multiple pulse sequence (CRAMPS) solid-state NMR spectra of beta-maltose monohydrate are presented. (1)H-(1)H DQ-SQ CRAMPS spectra are presented together with (1)H (DQ)-(13)C correlation spectra obtained with a new pulse sequence that correlates a high-resolution (1)H DQ dimension with a (13)C single quantum (SQ) dimension using the refocused INEPT pulse-sequence element to transfer magnetization via one-bond (13)C-(1)H J couplings. Compared to the observation of only a single broad peak in a (1)H DQ spectrum recorded at 30 kHz magic-angle spinning (MAS), the use of DUMBO (1)H homonuclear decoupling in the (1)H DQ CRAMPS experiment allows the resolution of distinct DQ correlation peaks which, in combination with first-principles chemical shift calculations based on the GIPAW (Gauge Including Projector Augmented Waves) plane-wave pseudopotential approach, enables the assignment of the (1)H resonances to the 24 distinct protons. We believe this to be the first experimental solid-state NMR determination of the hydroxyl OH (1)H chemical shifts for a simple sugar. Variable-temperature (1)H-(1)H DQ CRAMPS spectra reveal small increases in the (1)H chemical shifts of the OH resonances upon decreasing the temperature from 348 K to 248 K.
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Affiliation(s)
- Amy L Webber
- Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
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16
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Qi W, Zhang A, Good TA, Fernandez EJ. Two disaccharides and trimethylamine N-oxide affect Abeta aggregation differently, but all attenuate oligomer-induced membrane permeability. Biochemistry 2009; 48:8908-19. [PMID: 19637920 DOI: 10.1021/bi9006397] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Interaction between aggregates of amyloid beta protein (Abeta) and membranes has been hypothesized by many to be a key event in the mechanism of neurotoxicity associated with Alzheimer's disease (AD). Proposed membrane-related mechanisms of neurotoxicity include ion channel formation, membrane disruption, changes in membrane capacitance, and lipid membrane oxidation. Recently, osmolytes such as trehalose have been found to delay Abeta aggregation in vitro and reduce neurotoxicity. However, no direct measurements have separated the effects of osmolytes on Abeta aggregation versus membrane interactions. In this article, we tested the influence of trehalose, sucrose and trimethylamine-N-oxide (TMAO) on Abeta aggregation and fluorescent dye leakage induced by Abeta aggregates from liposomes. In the absence of lipid vesicles, trehalose and sucrose, but not TMAO, were found to delay Abeta aggregation. In contrast, all of the osmolytes significantly attenuated dye leakage. Dissolution of preformed Abeta aggregates was excluded as a possible mechanism of dye leakage attenuation by measurements of Congo red binding as well as hydrogen-deuterium exchange detected by mass spectrometry (HX-MS). However, the accelerated conversion of high order oligomers to fibril caused by vesicles did not take place if any of the three osmolytes presented. Instead, in the case of disaccharide, osmolytes were found to form adducts with Abeta, and change the dissociation dynamics of soluble oligomeric species. Both effects may have contributed to the observed osmolyte attenuation of dye leakage. These results suggest that disaccharides and TMAO may have very different effects on Abeta aggregation because of the different tendencies of the osmolytes to interact with the peptide backbone. However, the effects on Abeta membrane interaction may be due to much more general phenomena associated with osmolyte enhancement of Abeta oligomer stability and/or direct interaction of osmolyte with the membrane surface.
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Affiliation(s)
- Wei Qi
- Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
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17
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Cadars S, Lesage A, Pickard CJ, Sautet P, Emsley L. Characterizing Slight Structural Disorder in Solids by Combined Solid-State NMR and First Principles Calculations. J Phys Chem A 2009; 113:902-11. [DOI: 10.1021/jp810138y] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sylvian Cadars
- CNRS/ENS Lyon/UCB-Lyon 1, Centre de RMN à Très Hauts Champs, Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France, CEMHTI-CNRS: Conditions Extrêmes et Matériaux, Hautes Températures et Irradiation, 1D avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9AD, Scotland, and Laboratoire de chimie, CNRS and Ecole Normale Supérieure de Lyon, Institut de Chimie de Lyon, Université de Lyon, 46 allée d‘Italie,
| | - Anne Lesage
- CNRS/ENS Lyon/UCB-Lyon 1, Centre de RMN à Très Hauts Champs, Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France, CEMHTI-CNRS: Conditions Extrêmes et Matériaux, Hautes Températures et Irradiation, 1D avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9AD, Scotland, and Laboratoire de chimie, CNRS and Ecole Normale Supérieure de Lyon, Institut de Chimie de Lyon, Université de Lyon, 46 allée d‘Italie,
| | - Chris J. Pickard
- CNRS/ENS Lyon/UCB-Lyon 1, Centre de RMN à Très Hauts Champs, Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France, CEMHTI-CNRS: Conditions Extrêmes et Matériaux, Hautes Températures et Irradiation, 1D avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9AD, Scotland, and Laboratoire de chimie, CNRS and Ecole Normale Supérieure de Lyon, Institut de Chimie de Lyon, Université de Lyon, 46 allée d‘Italie,
| | - Philippe Sautet
- CNRS/ENS Lyon/UCB-Lyon 1, Centre de RMN à Très Hauts Champs, Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France, CEMHTI-CNRS: Conditions Extrêmes et Matériaux, Hautes Températures et Irradiation, 1D avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9AD, Scotland, and Laboratoire de chimie, CNRS and Ecole Normale Supérieure de Lyon, Institut de Chimie de Lyon, Université de Lyon, 46 allée d‘Italie,
| | - Lyndon Emsley
- CNRS/ENS Lyon/UCB-Lyon 1, Centre de RMN à Très Hauts Champs, Université de Lyon, 5 rue de la Doua, 69100 Villeurbanne, France, CEMHTI-CNRS: Conditions Extrêmes et Matériaux, Hautes Températures et Irradiation, 1D avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9AD, Scotland, and Laboratoire de chimie, CNRS and Ecole Normale Supérieure de Lyon, Institut de Chimie de Lyon, Université de Lyon, 46 allée d‘Italie,
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18
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Luthra SA, Pikal MJ, Utz M. Solid State 13C NMR Investigation of Impact of Annealing in Lyophilized Glasses. J Pharm Sci 2008; 97:4336-46. [DOI: 10.1002/jps.21316] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Stortz CA, French AD. Disaccharide conformational maps: adiabaticity in analogues with variable ring shapes. MOLECULAR SIMULATION 2008. [DOI: 10.1080/08927020701663339] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Shao L, Yates JR, Titman JJ. Carbon-13 chemical shift tensors of disaccharides: measurement, computation and assignment. J Phys Chem A 2007; 111:13126-32. [PMID: 17999473 DOI: 10.1021/jp075921b] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A recently developed chemical shift anisotropy amplification solid-state nuclear magnetic resonance (NMR) experiment is applied to the measurement of the chemical shift tensors in three disaccharides: sucrose, maltose, and trehalose. The measured tensor principal values are compared with those calculated from first principles using density functional theory within the planewave-pseudopotential approach. In addition, a method of assigning poorly dispersed NMR spectra, based on comparing experimental and calculated shift anisotropies as well as isotropic shifts, is demonstrated.
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Affiliation(s)
- Limin Shao
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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21
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Lefort R, Bordat P, Cesaro A, Descamps M. Exploring conformational energy landscape of glassy disaccharides by cross polarization magic angle spinning 13C NMR and numerical simulations. I. Methodological aspects. J Chem Phys 2007; 126:014510. [PMID: 17212503 DOI: 10.1063/1.2409934] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
This article demonstrates the ability of chemical shift surfaces to provide information on distributions of various conformations of disaccharides in the glassy, solid state. The validity of the general method leading to a simulation of inhomogeneous (13)C chemical shift distributions is discussed in detail. In particular, a proper consideration of extrema and saddle points of the chemical shift map correctly accounts for the observed discontinuities in the experimental cross polarization magic angle spinning spectra. Provided that these basic requirements are met, density functional theory/gauge-independent atomic orbital chemical shift maps calculated on relaxed conformations lead to a very satisfactory description of the experimental line shapes. Using amorphous trehalose as a model disaccharide, the simulation unambiguously defines the range of most populated conformations in the glass.
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Affiliation(s)
- Ronan Lefort
- Groupe Matière Condensée et Matériaux, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
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22
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Lefort R, Bordat P, Cesaro A, Descamps M. Exploring the conformational energy landscape of glassy disaccharides by cross polarization magic angle spinning C13 nuclear magnetic resonance and numerical simulations. II. Enhanced molecular flexibility in amorphous trehalose. J Chem Phys 2007; 126:014511. [PMID: 17212504 DOI: 10.1063/1.2409935] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
This paper uses chemical shift surfaces to simulate experimental (13)C cross polarization magic angle spinning spectra for amorphous solid state disaccharides, paying particular attention to the glycosidic linkage atoms in trehalose, sucrose, and lactose. The combination of molecular mechanics with density functional theory/gauge invariant atomic orbital ab initio methods provides reliable structural information on the conformational distribution in the glass. The results are interpreted in terms of an enhanced flexibility that trehalose possesses in the amorphous solid state, at least on the time scale of (13)C nuclear magnetic resonance measurements. Implications of these findings for the fragility of trehalose glass and bioprotectant action are discussed.
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Affiliation(s)
- Ronan Lefort
- Groupe Matière Condensée et Matériaux, Unversité de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
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23
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Singh KJ, Roos YH. State transitions and freeze concentration in trehalose–protein–cornstarch mixtures. Lebensm Wiss Technol 2006. [DOI: 10.1016/j.lwt.2005.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Anopchenko A, Psurek T, VanderHart D, Douglas JF, Obrzut J. Dielectric study of the antiplasticization of trehalose by glycerol. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:031501. [PMID: 17025634 DOI: 10.1103/physreve.74.031501] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2006] [Revised: 04/08/2006] [Indexed: 05/12/2023]
Abstract
Recent measurements have suggested that the antiplasticizing effect of glycerol on trehalose can significantly increase the preservation times of proteins stored in this type of preservative formulation. In order to better understand the physical origin of this phenomenon, we examine the nature of antiplasticization in trehalose-glycerol mixtures by dielectric spectroscopy. These measurements cover a broad frequency range between 40 Hz to 18 GHz (covering the secondary relaxation range of the fragile glass-former trehalose and the primary relaxation range of the strong glass-former glycerol) and a temperature (T) range bracketing room temperature (220 K to 350 K). The Havriliak-Negami function precisely fits our relaxation data and allows us to determine the temperature and composition dependence of the relaxation time tau describing a relative fast dielectric relaxation process appropriate to the characterization of antiplasticization. We observe that increasing the glycerol concentration at fixed T increases tau (i.e., the extent of antiplasticization) until a temperature dependent critical "plasticization concentration" xwp is reached. At a fixed concentration, we find a temperature at which antiplasticization first occurs upon cooling and we designate this as the "antiplasticization temperature," Tant. The ratio of the tau values for the mixture and pure trehalose is found to provide a useful measure of the extent of antiplasticization, and we explore other potential measures of antiplasticization relating to the dielectric strength.
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Affiliation(s)
- A Anopchenko
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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25
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Sergeyev I, Moyna G. Determination of the three-dimensional structure of oligosaccharides in the solid state from experimental 13C NMR data and ab initio chemical shift surfaces. Carbohydr Res 2005; 340:1165-74. [PMID: 15797132 DOI: 10.1016/j.carres.2005.02.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2004] [Accepted: 02/16/2005] [Indexed: 11/20/2022]
Abstract
A novel method for the determination of the three-dimensional (3D) structure of oligosaccharides in the solid state using experimental 13C NMR data is presented. The approach employs this information, combined with 13C chemical shift surfaces (CSSs) for the glycosidic bond carbons in the generation of NMR pseudopotential energy functions suitable for use as constraints in molecular modeling simulations. Application of the method to trehalose, cellobiose, and cellotetraose produces 3D models that agree remarkably well with the reported X-ray structures, with phi and psi dihedral angles that are within 10 degrees from the ones observed in the crystals. The usefulness of the approach is further demonstrated in the determination of the 3D structure of the cellohexaose, an hexasaccharide for which no X-ray data has been reported, as well as in the generation of accurate structural models for cellulose II and amylose V6.
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Affiliation(s)
- Ivan Sergeyev
- Department of Chemistry and Biochemistry, University of the Sciences in Philadelphia, 600 South 43rd Street, Philadelphia, PA 19104-4495, USA
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26
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Suihko EJ, Forbes RT, Apperley DC. A solid-state NMR study of molecular mobility and phase separation in co-spray-dried protein–sugar particles. Eur J Pharm Sci 2005; 25:105-12. [PMID: 15854806 DOI: 10.1016/j.ejps.2005.02.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Revised: 01/27/2005] [Accepted: 02/04/2005] [Indexed: 11/24/2022]
Abstract
Molecular mobility and physical form of co-spray-dried sugar-lysozyme formulations were evaluated. Co-spray-dried trehalose:lysozyme and sucrose:lysozyme formulations in 1:9, 1:1 and 9:1 ratios (w:w) were stored at 0% RH and 75% RH for 5-6 days. Molecular mobility and physical form of the co-spray-dried formulations after storage were determined by using 13C and 1H solid-state NMR as well as X-ray powder diffractometry. The results showed that increasing sugar content in co-spray-dried formulations stored at 0% RH decreased molecular mobility of the amorphous formulations indicating a close association of the protein and sugar. Exposure of sugar-lysozyme 1:1 and 9:1 formulations to 75% RH led to separation of sugar and protein phases, where the sugar phase was crystalline. The intimate sugar-lysozyme interaction of the formulations stored at 0% RH and the phase separation of the sugar-rich formulations stored at 75% RH were also confirmed by using 13C solid-state NMR spin-lattice relaxation time-filter (T1-filter) measurements. The propensity of sucrose and trehalose to crystallise was similar; however, the results suggest that part of the sugar in the phase-separated formulations remained amorphous and in close association with lysozyme.
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Affiliation(s)
- Eero J Suihko
- Department of Pharmaceutics, University of Kuopio, P.O. 1627, FIN-70211 Kuopio, Finland.
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27
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Lefort R, De Gusseme A, Willart JF, Danède F, Descamps M. Solid state NMR and DSC methods for quantifying the amorphous content in solid dosage forms: an application to ball-milling of trehalose. Int J Pharm 2004; 280:209-19. [PMID: 15265560 DOI: 10.1016/j.ijpharm.2004.05.012] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2004] [Revised: 05/20/2004] [Accepted: 05/21/2004] [Indexed: 11/26/2022]
Abstract
The purpose of this study was to determine quantitatively the amorphous fraction in crystalline-amorphous powder mixtures of trehalose, in order to assess the ability of the (13)C NMR technique for quantitative amorphous characterization. The NMR method is described in detail and its accuracy is compared to that of the DSC technique. Amorphous trehalose was prepared by mechanical milling. Samples with different amorphous fractions were prepared by physical mixing of purely amorphous and purely crystalline powders. The results reveal a close correlation between the imposed compositions of the physical mixtures and those determined by NMR and DSC, indicating that both are useful and accurate methods for compositional characterization of powders. The NMR method is then used to determine the evolution of the amorphous fraction in a trehalose powder, during a milling procedure which ultimately leads to a fully amorphous state.
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Affiliation(s)
- R Lefort
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS UMR 8024, Université de Lille 1, F-59655 Villeneuve d'Ascq Cedex, France.
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28
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O'Brien EP, Moyna G. Use of 13C chemical shift surfaces in the study of carbohydrate conformation. Application to cyclomaltooligosaccharides (cyclodextrins) in the solid state and in solution. Carbohydr Res 2004; 339:87-96. [PMID: 14659674 DOI: 10.1016/j.carres.2003.09.034] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The anomeric carbon chemical shifts of free cyclomaltohexaose, -heptaose, -octaose, -decaose, and -tetradecaose (alpha-, beta-, gamma-, epsilon-, and eta-cyclodextrin, respectively), and of alpha-cyclodextrin inclusion complexes, both in the solid state and in solution, were computed using ab initio 13C chemical shift surfaces for the D-Glcp-alpha-(1-->4)-D-Glcp linkage as a function of the glycosidic bond <Phi,Psi> dihedral angles. Chemical shift calculations in the solid state used <Phi,Psi> angle pairs measured from cyclodextrin X-ray structures as input. For estimations in the liquid state two different approaches were employed to account for dynamic averaging. In one, the computed solid-state anomeric carbon chemical shifts for each cyclodextrin D-Glcp monomer were simply averaged to obtain an estimate of the 13C shifts in solution. In the other, chemical shifts for the anomeric carbons were determined by averaging back-calculated 13C shift trajectories derived from a series of 5 ns molecular dynamic simulations for the oligosaccharides with explicit representation of water. Good agreement between calculated and experimental 13C shifts was found in all cases. Furthermore, our results show that the ab initio 13C chemical shift surfaces are sufficiently sensitive to reproduce the small variations observed for the anomeric 13C shifts of the different cyclodextrin D-Glcp units in the solid state with excellent accuracy. The use of chemical shift surfaces as tools in conformational studies of oligosaccharides is discussed.
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Affiliation(s)
- Edward P O'Brien
- Department of Chemistry and Biochemistry, University of the Sciences in Philadelphia, 600 South 43rd Street, Philadelphia, PA 19104-4495, USA
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29
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van Dam L, Ouwerkerk N, Brinkmann A, Raap J, Levitt MH. Solid-state NMR determination of sugar ring pucker in (13)C-labeled 2'-deoxynucleosides. Biophys J 2002; 83:2835-44. [PMID: 12414715 PMCID: PMC1302367 DOI: 10.1016/s0006-3495(02)75292-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The H3'-C3'-C4'-H4' torsional angles of two microcrystalline 2'-deoxynucleosides, thymidine and 2'-deoxycytidine.HCl, doubly (13)C-labeled at the C3' and C4' positions of the sugar ring, have been measured by solid-state magic-angle-spinning nuclear magnetic resonance (NMR). A double-quantum heteronuclear local field experiment with frequency-switched Lee-Goldberg homonuclear decoupling was used. The H3'-C3'-C4'-H4' torsional angles were obtained by comparing the experimental curves with numerical simulations, including the two (13)C nuclei, the directly bonded (1)H nuclei, and five remote protons. The H3'-C3'-C4'-H4' angles were converted into sugar pucker angles and compared with crystallographic data. The delta torsional angles determined by solid-state NMR and x-ray crystallography agree within experimental error. Evidence is also obtained that the proton positions may be unreliable in the x-ray structures. This work confirms that double-quantum solid-state NMR is a feasible tool for studying sugar pucker conformations in macromolecular complexes that are unsuitable for solution NMR or crystallography.
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Affiliation(s)
- Lorens van Dam
- Physical Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden
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30
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Andersen C, Schiffler B, Charbit A, Benz R. PH-induced collapse of the extracellular loops closes Escherichia coli maltoporin and allows the study of asymmetric sugar binding. J Biol Chem 2002; 277:41318-25. [PMID: 12185084 DOI: 10.1074/jbc.m206804200] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
LamB (maltoporin) is essential for the uptake of maltose and malto-oligosaccharides across the outer membrane of Escherichia coli. Purified LamB was reconstituted in artificial lipid bilayer membranes forming channels in the permanently open configuration at neutral pH. Almost complete channel closure was observed when the pH on both sides of the membrane was lowered to pH 4. When LamB was added to only one side of the membrane, the cis-side, and the pH was lowered at either side of the membrane, the cis- or the trans-side, the response to pH was asymmetric, suggesting preferential orientation of maltoporin channels and pH- dependent closure of only one side of the channel. In experiments with LamB mutants in which major external loops L4, L6, and/or L9 were deleted, we identified the surface-exposed loops L4 and L6 as the cause of pH-mediated closure. The pH dependence of the LamB channel is consistent with the assumption that it inserts in a preferential orientation into the lipid bilayer. About 70-80% of the reconstituted channels are oriented with the extracellular entrance toward the side to which the protein was added (the cis-side) and with the periplasmic opening on the opposite side (the trans-side). The possibility of closing the channels, which are oriented in the reverse direction by low pH at the trans-side, allowed the deduction of channel asymmetry with respect to carbohydrate binding kinetics. Whereas maltose binding was found to be almost symmetric with respect to the channel orientation, the sucrose and trehalose binding to LamB was asymmetric. The results are discussed in respect to possible physiological function of the pH-dependent closure of maltoporin.
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Affiliation(s)
- Christian Andersen
- Universität Würzburg, Lehrstuhl für Biotechnologie, Biozentrum der Universität Würzburg, Am Hubland, Germany.
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31
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Ravindranathan S, Karlsson T, Lycknert K, Widmalm G, Levitt MH. Conformation of the glycosidic linkage in a disaccharide investigated by double-quantum solid-state NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2001; 151:136-141. [PMID: 11444948 DOI: 10.1006/jmre.2001.2357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Double-quantum heteronuclear local field NMR is performed on a sample of a 13C2-labeled disaccharide, in which the two 13C spins are located on opposite sides of the glycosidic linkage. The evolution of the double-quantum coherences is found to be consistent with the solid-state conformation of the molecule, as previously determined by X-ray diffraction. The dependence of the double-quantum evolution on the glycosidic torsional angles is examined by using a graphical molecular manipulation program interfaced to a numerical spin simulation module.
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Affiliation(s)
- S Ravindranathan
- Physical Chemistry Division, Stockholm University, Stockholm, S-10691, Sweden
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32
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Stevensson B, Höög C, Ulfstedt-Jäkel K, Huang Z, Widmalm G, Maliniak A. Solid-State Deuterium NMR and Molecular Modeling Studies of Conformational Dynamics in Carbohydrates. J Phys Chem B 2000. [DOI: 10.1021/jp0002805] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Baltzar Stevensson
- Division of Physical Chemistry and Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
| | - Christer Höög
- Division of Physical Chemistry and Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
| | - Kai Ulfstedt-Jäkel
- Division of Physical Chemistry and Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
| | - Zhi Huang
- Division of Physical Chemistry and Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
| | - Göran Widmalm
- Division of Physical Chemistry and Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
| | - Arnold Maliniak
- Division of Physical Chemistry and Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
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33
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Ravindranathan S, Feng X, Karlsson T, Widmalm G, Levitt MH. Investigation of Carbohydrate Conformation in Solution and in Powders by Double-Quantum NMR. J Am Chem Soc 2000. [DOI: 10.1021/ja9910863] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sapna Ravindranathan
- Contribution from the Physical Chemistry Division, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden, and Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden
| | - Xiaolong Feng
- Contribution from the Physical Chemistry Division, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden, and Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden
| | - Torgny Karlsson
- Contribution from the Physical Chemistry Division, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden, and Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden
| | - Göran Widmalm
- Contribution from the Physical Chemistry Division, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden, and Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden
| | - Malcolm H. Levitt
- Contribution from the Physical Chemistry Division, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden, and Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, S-10691 Sweden
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