1
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Mosca I, Pounot K, Beck C, Colin L, Matsarskaia O, Grapentin C, Seydel T, Schreiber F. Biophysical Determinants for the Viscosity of Concentrated Monoclonal Antibody Solutions. Mol Pharm 2023; 20:4698-4713. [PMID: 37549226 DOI: 10.1021/acs.molpharmaceut.3c00440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Monoclonal antibodies (mAbs) are particularly relevant for therapeutics due to their high specificity and versatility, and mAb-based drugs are hence used to treat numerous diseases. The increased patient compliance of self-administration motivates the formulation of products for subcutaneous (SC) administration. The associated challenge is to formulate highly concentrated antibody solutions to achieve a significant therapeutic effect, while limiting their viscosity and preserving their physicochemical stability. Protein-protein interactions (PPIs) are in fact the root cause of several potential problems concerning the stability, manufacturability, and delivery of a drug product. The understanding of macroscopic viscosity requires an in-depth knowledge on protein diffusion, PPIs, and self-association/aggregation. Here, we study the self-diffusion of different mAbs of the IgG1 subtype in aqueous solution as a function of the concentration and temperature by quasi-elastic neutron scattering (QENS). QENS allows us to probe the short-time self-diffusion of the molecules and therefore to determine the hydrodynamic mAb cluster size and to gain information on the internal mAb dynamics. Small-angle neutron scattering (SANS) is jointly employed to probe structural details and to understand the nature and intensity of PPIs. Complementary information is provided by molecular dynamics (MD) simulations and viscometry, thus obtaining a comprehensive picture of mAb diffusion.
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Affiliation(s)
- Ilaria Mosca
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, Tübingen 72076, Germany
- Institut Max von Laue - Paul Langevin, 71 Av. des Martyrs, Grenoble 38042, France
| | - Kévin Pounot
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, Tübingen 72076, Germany
- Institut Max von Laue - Paul Langevin, 71 Av. des Martyrs, Grenoble 38042, France
| | - Christian Beck
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, Tübingen 72076, Germany
- Institut Max von Laue - Paul Langevin, 71 Av. des Martyrs, Grenoble 38042, France
| | - Louise Colin
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, Tübingen 72076, Germany
- Institut Max von Laue - Paul Langevin, 71 Av. des Martyrs, Grenoble 38042, France
| | - Olga Matsarskaia
- Institut Max von Laue - Paul Langevin, 71 Av. des Martyrs, Grenoble 38042, France
| | | | - Tilo Seydel
- Institut Max von Laue - Paul Langevin, 71 Av. des Martyrs, Grenoble 38042, France
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, Tübingen 72076, Germany
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2
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Yu X, Cheng Y, Li Y, Polo-Garzon F, Liu J, Mamontov E, Li M, Lennon D, Parker SF, Ramirez-Cuesta AJ, Wu Z. Neutron Scattering Studies of Heterogeneous Catalysis. Chem Rev 2023. [PMID: 37315192 DOI: 10.1021/acs.chemrev.3c00101] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Understanding the structural dynamics/evolution of catalysts and the related surface chemistry is essential for establishing structure-catalysis relationships, where spectroscopic and scattering tools play a crucial role. Among many such tools, neutron scattering, though less-known, has a unique power for investigating catalytic phenomena. Since neutrons interact with the nuclei of matter, the neutron-nucleon interaction provides unique information on light elements (mainly hydrogen), neighboring elements, and isotopes, which are complementary to X-ray and photon-based techniques. Neutron vibrational spectroscopy has been the most utilized neutron scattering approach for heterogeneous catalysis research by providing chemical information on surface/bulk species (mostly H-containing) and reaction chemistry. Neutron diffraction and quasielastic neutron scattering can also supply important information on catalyst structures and dynamics of surface species. Other neutron approaches, such as small angle neutron scattering and neutron imaging, have been much less used but still give distinctive catalytic information. This review provides a comprehensive overview of recent advances in neutron scattering investigations of heterogeneous catalysis, focusing on surface adsorbates, reaction mechanisms, and catalyst structural changes revealed by neutron spectroscopy, diffraction, quasielastic neutron scattering, and other neutron techniques. Perspectives are also provided on the challenges and future opportunities in neutron scattering studies of heterogeneous catalysis.
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Affiliation(s)
- Xinbin Yu
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381, United States
| | - Yongqiang Cheng
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yuanyuan Li
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381, United States
| | - Felipe Polo-Garzon
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381, United States
| | - Jue Liu
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Meijun Li
- Manufacturing Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - David Lennon
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Stewart F Parker
- ISIS Pulsed Neutron and Muon Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
| | - Anibal J Ramirez-Cuesta
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zili Wu
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381, United States
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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3
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Lavén R, Koza MM, Malavasi L, Perrichon A, Appel M, Karlsson M. Rotational Dynamics of Organic Cations in Formamidinium Lead Iodide Perovskites. J Phys Chem Lett 2023; 14:2784-2791. [PMID: 36898059 PMCID: PMC10041645 DOI: 10.1021/acs.jpclett.3c00185] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 03/02/2023] [Indexed: 06/18/2023]
Abstract
We report results from quasi-elastic neutron scattering studies on the rotational dynamics of formamidinium (HC[NH2]2+, FA) and methylammonium (CH3NH3+, MA) cations in FA1-xMAxPbI3 with x = 0 and 0.4 and compare it to the dynamics in MAPbI3. For FAPbI3, the FA cation dynamics evolve from nearly isotropic rotations in the high-temperature (T > 285 K) cubic phase through reorientations between preferred orientations in the intermediate-temperature tetragonal phase (140 K < T ⩽ 285 K) to an even more complex dynamics, due to a disordered arrangement of the FA cations, in the low-temperature tetragonal phase (T ⩽ 140 K). For FA0.6MA0.4PbI3, the dynamics of the respective organic cations evolve from a relatively similar behavior to FAPbI3 and MAPbI3 at room temperature to a different behavior in the lower-temperature phases where the MA cation dynamics are a factor of 50 faster as compared to those of MAPbI3. This insight suggests that tuning the MA/FA cation ratio may be a promising approach to tailoring the dynamics and, in effect, optical properties of FA1-xMAxPbI3.
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Affiliation(s)
- Rasmus Lavén
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, SE-412 96 Göteborg, Sweden
| | - Michael M. Koza
- Institut
Laue-Langevin, 71 avenue
des Martyrs, CS 20156, 38042 Grenoble cedex 9, France
| | - Lorenzo Malavasi
- Department
of Chemistry and INSTM, University of Pavia, Viale Taramelli 16, Pavia 27100, Italy
| | - Adrien Perrichon
- ISIS
Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Markus Appel
- Institut
Laue-Langevin, 71 avenue
des Martyrs, CS 20156, 38042 Grenoble cedex 9, France
| | - Maths Karlsson
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, SE-412 96 Göteborg, Sweden
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4
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Di Bari D, Timr S, Guiral M, Giudici-Orticoni MT, Seydel T, Beck C, Petrillo C, Derreumaux P, Melchionna S, Sterpone F, Peters J, Paciaroni A. Diffusive Dynamics of Bacterial Proteome as a Proxy of Cell Death. ACS CENTRAL SCIENCE 2023; 9:93-102. [PMID: 36712493 PMCID: PMC9881203 DOI: 10.1021/acscentsci.2c01078] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Indexed: 05/30/2023]
Abstract
Temperature variations have a big impact on bacterial metabolism and death, yet an exhaustive molecular picture of these processes is still missing. For instance, whether thermal death is determined by the deterioration of the whole or a specific part of the proteome is hotly debated. Here, by monitoring the proteome dynamics of E. coli, we clearly show that only a minor fraction of the proteome unfolds at the cell death. First, we prove that the dynamical state of the E. coli proteome is an excellent proxy for temperature-dependent bacterial metabolism and death. The proteome diffusive dynamics peaks at about the bacterial optimal growth temperature, then a dramatic dynamical slowdown is observed that starts just below the cell's death temperature. Next, we show that this slowdown is caused by the unfolding of just a small fraction of proteins that establish an entangling interprotein network, dominated by hydrophobic interactions, across the cytoplasm. Finally, the deduced progress of the proteome unfolding and its diffusive dynamics are both key to correctly reproduce the E. coli growth rate.
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Affiliation(s)
- Daniele Di Bari
- Università
degli Studi di Perugia, Dipartimento di
Fisica e Geologia, Via
A. Pascoli, 06123Perugia PG, Italy
- Université
Grenoble Alpes, CNRS, Laboratoire Interdisciplinaire de Physique, 38400Saint-Martin-d’Héres, France
- Institut
Laue-Langevin, 38000Grenoble, France
| | - Stepan Timr
- Laboratoire
de Biochimie Théorique (UPR9080), CNRS, Université de Paris Cité, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut
de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005Paris, France
- J.
Heyrovský
Institute of Physical Chemistry, Czech Academy
of Sciences, 182 23Prague 8, Czechia
| | - Marianne Guiral
- Laboratoire
de Bioénergétique et Ingénierie des Protéines, BIP, CNRS, Aix-Marseille Université, 13400Marseille, France
| | | | - Tilo Seydel
- Institut
Laue-Langevin, 38000Grenoble, France
| | | | - Caterina Petrillo
- Università
degli Studi di Perugia, Dipartimento di
Fisica e Geologia, Via
A. Pascoli, 06123Perugia PG, Italy
| | - Philippe Derreumaux
- Laboratoire
de Biochimie Théorique (UPR9080), CNRS, Université de Paris Cité, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut
de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut Universitaire de France, 75005Paris, France
| | - Simone Melchionna
- ISC-CNR,
Dipartimento di Fisica, Università
Sapienza, 00185Rome, Italy
- Lexma
Technology1337 Massachusetts
Avenue, Arlington, Massachusetts02476, United States
| | - Fabio Sterpone
- Laboratoire
de Biochimie Théorique (UPR9080), CNRS, Université de Paris Cité, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut
de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005Paris, France
| | - Judith Peters
- Université
Grenoble Alpes, CNRS, Laboratoire Interdisciplinaire de Physique, 38400Saint-Martin-d’Héres, France
- Institut
Laue-Langevin, 38000Grenoble, France
- Institut Universitaire de France, 75005Paris, France
| | - Alessandro Paciaroni
- Università
degli Studi di Perugia, Dipartimento di
Fisica e Geologia, Via
A. Pascoli, 06123Perugia PG, Italy
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5
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Bertini L, Libera V, Ripanti F, Seydel T, Paolantoni M, Orecchini A, Petrillo C, Comez L, Paciaroni A. Role of fast dynamics in the complexation of G-quadruplexes with small molecules. Phys Chem Chem Phys 2022; 24:29232-29240. [PMID: 36445842 DOI: 10.1039/d2cp03602a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
G-quadruplexes (G4s) formed by the human telomeric sequence AG3 (TTAG3)3 (Tel22) play a key role in cancer and aging. We combined elastic incoherent neutron scattering (EINS) and quasielastic incoherent neutron scattering (QENS) to characterize the internal dynamics of Tel22 G4s and to assess how it is affected by complexation with two standard ligands, Berberine and BRACO19. We show that the interaction with the two ligands induces an increase of the overall mobility of Tel22 as quantified by the mean squared displacements (MSD) of hydrogen atoms. At the same time, the complexes display a lower stiffness than G4 alone. Two different types of motion characterize the G4 nanosecond timescale dynamics. Upon complexation, an increasing fraction of G4 atomic groups participate in this fast dynamics, along with an increase in the relevant characteristic length scales. We suggest that the entropic contribution to the conformational free energy of these motions might be crucial for the complexation mechanisms.
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Affiliation(s)
- Luca Bertini
- Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy.
| | - Valeria Libera
- Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy. .,Istituto Officina dei Materiali-IOM, National Research Council-CNR, Via Alessandro Pascoli, 06123 Perugia, Italy.
| | - Francesca Ripanti
- Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy.
| | - Tilo Seydel
- Institut Max von Laue - Paul Langevin (ILL) 71 avenue des Martyrs, 38042 Grenoble, France
| | - Marco Paolantoni
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto, 6, 06123 Perugia, Italy
| | - Andrea Orecchini
- Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy.
| | - Caterina Petrillo
- Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy.
| | - Lucia Comez
- Istituto Officina dei Materiali-IOM, National Research Council-CNR, Via Alessandro Pascoli, 06123 Perugia, Italy.
| | - Alessandro Paciaroni
- Department of Physics and Geology, University of Perugia, Via Alessandro Pascoli, 06123 Perugia, Italy.
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6
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Beck C, Grimaldo M, Lopez H, Da Vela S, Sohmen B, Zhang F, Oettel M, Barrat JL, Roosen-Runge F, Schreiber F, Seydel T. Short-Time Transport Properties of Bidisperse Suspensions of Immunoglobulins and Serum Albumins Consistent with a Colloid Physics Picture. J Phys Chem B 2022; 126:7400-7408. [PMID: 36112146 PMCID: PMC9527755 DOI: 10.1021/acs.jpcb.2c02380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The crowded environment of biological systems such as
the interior
of living cells is occupied by macromolecules with a broad size distribution.
This situation of polydispersity might influence the dependence of
the diffusive dynamics of a given tracer macromolecule in a monodisperse
solution on its hydrodynamic size and on the volume fraction. The
resulting size dependence of diffusive transport crucially influences
the function of a living cell. Here, we investigate a simplified model
system consisting of two constituents in aqueous solution, namely,
of the proteins bovine serum albumin (BSA) and bovine polyclonal gamma-globulin
(Ig), systematically depending on the total volume fraction and ratio
of these constituents. From high-resolution quasi-elastic neutron
spectroscopy, the separate apparent short-time diffusion coefficients
for BSA and Ig in the mixture are extracted, which show substantial
deviations from the diffusion coefficients measured in monodisperse
solutions at the same total volume fraction. These deviations can
be modeled quantitatively using results from the short-time rotational
and translational diffusion in a two-component hard sphere system
with two distinct, effective hydrodynamic radii. Thus, we find that
a simple colloid picture well describes short-time diffusion in binary
mixtures as a function of the mixing ratio and the total volume fraction.
Notably, the self-diffusion of the smaller protein BSA in the mixture
is faster than the diffusion in a pure BSA solution, whereas the self-diffusion
of Ig in the mixture is slower than in the pure Ig solution.
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Affiliation(s)
- Christian Beck
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
- Institut Max von Laue─Paul Langevin (ILL), CS 20156, F-38042 Grenoble Cedex 9, France
| | - Marco Grimaldo
- Institut Max von Laue─Paul Langevin (ILL), CS 20156, F-38042 Grenoble Cedex 9, France
| | - Hender Lopez
- School of Physics and Optometric & Clinical Sciences, Technological University Dublin, D07 XT95 Grangegorman, Ireland
| | - Stefano Da Vela
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Benedikt Sohmen
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Martin Oettel
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | | | - Felix Roosen-Runge
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces (BRCB), Malmö University, 20506 Malmö, Sweden
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Tilo Seydel
- Institut Max von Laue─Paul Langevin (ILL), CS 20156, F-38042 Grenoble Cedex 9, France
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7
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Raskar T, Niebling S, Devos JM, Yorke BA, Härtlein M, Huse N, Forsyth VT, Seydel T, Pearson AR. Structure and diffusive dynamics of aspartate α-decarboxylase (ADC) liganded with D-serine in aqueous solution. Phys Chem Chem Phys 2022; 24:20336-20347. [PMID: 35980136 PMCID: PMC9429672 DOI: 10.1039/d2cp02063g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Incoherent neutron spectroscopy, in combination with dynamic light scattering, was used to investigate the effect of ligand binding on the center-of-mass self-diffusion and internal diffusive dynamics of Escherichia coli aspartate α-decarboxylase (ADC). The X-ray crystal structure of ADC in complex with the d-serine inhibitor was also determined, and molecular dynamics simulations were used to further probe the structural rearrangements that occur as a result of ligand binding. These experiments reveal that d-serine forms hydrogen bonds with some of the active site residues, that higher order oligomers of the ADC tetramer exist on ns–ms time-scales, and also show that ligand binding both affects the ADC internal diffusive dynamics and appears to further increase the size of the higher order oligomers. Neutron spectroscopy, dynamic light scattering, X-ray diffraction, and MD-simulations were used to investigate the effect of ligand binding on the structure and diffusive dynamics of Escherichia coli aspartate alpha-decarboxylase.![]()
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Affiliation(s)
- Tushar Raskar
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, Grenoble 38000, France. .,Partnership for Structural Biology, 71 Avenue des Martyrs, Grenoble 38000, France.,Institute for Nanostructure and Solid State Physics, Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg, 22761, Germany.
| | - Stephan Niebling
- Institute for Nanostructure and Solid State Physics, Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg, 22761, Germany. .,European Molecular Biology Laboratory, Hamburg, Notkestr. 85, 22607 Hamburg, Germany
| | - Juliette M Devos
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, Grenoble 38000, France. .,Partnership for Structural Biology, 71 Avenue des Martyrs, Grenoble 38000, France
| | - Briony A Yorke
- School of Chemistry and Bioscience, University of Bradford, Bradford, BD7 1DP, UK
| | - Michael Härtlein
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, Grenoble 38000, France. .,Partnership for Structural Biology, 71 Avenue des Martyrs, Grenoble 38000, France
| | - Nils Huse
- Institute for Nanostructure and Solid State Physics, Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg, 22761, Germany.
| | - V Trevor Forsyth
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, Grenoble 38000, France. .,Partnership for Structural Biology, 71 Avenue des Martyrs, Grenoble 38000, France.,Faculty of Natural Sciences, Keele University, Staffordshire, ST5 5BG, UK
| | - Tilo Seydel
- Institut Max von Laue - Paul Langevin, 71 Avenue des Martyrs, Grenoble 38000, France.
| | - Arwen R Pearson
- Institute for Nanostructure and Solid State Physics, Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg, 22761, Germany.
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8
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Sharma VK, Mamontov E. Multiscale lipid membrane dynamics as revealed by neutron spectroscopy. Prog Lipid Res 2022; 87:101179. [PMID: 35780913 DOI: 10.1016/j.plipres.2022.101179] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 06/25/2022] [Accepted: 06/27/2022] [Indexed: 12/22/2022]
Abstract
The plasma membrane is one of the principal structural components of the cell and, therefore, one of the key components of the cellular life. Because the membrane's dynamics links the membrane's structure and function, the complexity and the broad range of the membrane's motions are essential for the enormously diverse functionality of the cell membrane. Even for the main membrane component, the lipid bilayer, considered alone, the range and complexity of the lipid motions are remarkable. Spanning the time scale from sub-picosecond to minutes and hours, the lipid motion in a bilayer is challenging to study even when a broad array of dynamic measurement techniques is employed. Neutron scattering plays a special role among such dynamic measurement techniques, particularly, because it involves the energy transfers commensurate with the typical intra- and inter- molecular dynamics and the momentum transfers commensurate with intra- and inter-molecular distances. Thus, using neutron scattering-based techniques, the spatial and temporal information on the lipid motion can be obtained and analysed simultaneously. Protium vs. deuterium sensitivity and non-destructive character of the neutron probe add to the remarkable prowess of neutron scattering for elucidating the lipid dynamics. Herein we present an overview of the neutron scattering-based studies of lipid dynamics in model membranes, with a discussion of the direct relevance and implications to the real-life cell membranes. The latter are much more complex systems than simple model membranes, consisting of heterogeneous non-stationary domains composed of lipids, proteins, and other small molecules, such as carbohydrates. Yet many fundamental aspects of the membrane behavior and membrane interactions with other molecules can be understood from neutron scattering measurements of the model membranes. For example, such studies can provide a great deal of information on the interactions of antimicrobial compounds with the lipid matrix of a pathogen membrane, or the interactions of drug molecules with the plasma membrane. Finally, we briefly discuss the recently emerging field of neutron scattering membrane studies with a reach far beyond the model membrane systems.
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Affiliation(s)
- V K Sharma
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India.
| | - E Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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9
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Martins ML, Bordallo HN, Mamontov E. Water Dynamics in Cancer Cells: Lessons from Quasielastic Neutron Scattering. Medicina (B Aires) 2022; 58:medicina58050654. [PMID: 35630072 PMCID: PMC9145030 DOI: 10.3390/medicina58050654] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/04/2022] [Accepted: 05/10/2022] [Indexed: 12/14/2022] Open
Abstract
The severity of the cancer statistics around the globe and the complexity involving the behavior of cancer cells inevitably calls for contributions from multidisciplinary areas of research. As such, materials science became a powerful asset to support biological research in comprehending the macro and microscopic behavior of cancer cells and untangling factors that may contribute to their progression or remission. The contributions of cellular water dynamics in this process have always been debated and, in recent years, experimental works performed with Quasielastic neutron scattering (QENS) brought new perspectives to these discussions. In this review, we address these works and highlight the value of QENS in comprehending the role played by water molecules in tumor cells and their response to external agents, particularly chemotherapy drugs. In addition, this paper provides an overview of QENS intended for scientists with different backgrounds and comments on the possibilities to be explored with the next-generation spectrometers under construction.
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Affiliation(s)
- Murillo L. Martins
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, TN 37831, USA
- Correspondence: (M.L.M.); (E.M.)
| | - Heloisa N. Bordallo
- Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark;
| | - Eugene Mamontov
- Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge, TN 37831, USA
- Correspondence: (M.L.M.); (E.M.)
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10
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Mamontov E, Boone C, Frost MJ, Herwig KW, Huegle T, Lin JYY, McCormick B, McHargue W, Stoica AD, Torres P, Turner W. A concept of a broadband inverted geometry spectrometer for the Second Target Station at the Spallation Neutron Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:045101. [PMID: 35489951 DOI: 10.1063/5.0086451] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
BWAVES is an acronym for Broadband Wide-Angle VElocity Selector spectrometer, indicating that a novel WAVES (Wide-Angle VElocity Selector) device will be used to select the velocity/wavelength of the detected neutrons after they are scattered by the sample. We describe a conceptual design of BWAVES, a time-of-flight broadband inverted-geometry neutron spectrometer for the Second Target Station at the Spallation Neutron Source operated by Oak Ridge National Laboratory. Being the first inverted geometry spectrometer where the energy of the detected neutrons can be chosen by a WAVES device mechanically, irrespective of the limitations imposed by the crystal analyzers or filters, BWAVES will feature a uniquely broad, continuous dynamic range of measurable energy transfers, spanning 4.5 decades. This will enable measurements of both vibrational and relaxational excitations within the same, continuous scattering spectra. Novel approaches that are necessary for the implementation of a WAVES device at the BWAVES spectrometer will result in a spectrometer with the design and characteristics much different from those displayed by the neutron spectrometers in existence today.
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Affiliation(s)
- E Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Boone
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M J Frost
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K W Herwig
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Huegle
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Y Y Lin
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B McCormick
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W McHargue
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A D Stoica
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P Torres
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W Turner
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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11
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Takeiri F, Watanabe A, Okamoto K, Bresser D, Lyonnard S, Frick B, Ali A, Imai Y, Nishikawa M, Yonemura M, Saito T, Ikeda K, Otomo T, Kamiyama T, Kanno R, Kobayashi G. Hydride-ion-conducting K 2NiF 4-type Ba-Li oxyhydride solid electrolyte. NATURE MATERIALS 2022; 21:325-330. [PMID: 35027719 DOI: 10.1038/s41563-021-01175-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 11/22/2021] [Indexed: 05/10/2023]
Abstract
Hydrogen transport in solids, applied in electrochemical devices such as fuel cells and electrolysis cells, is key to sustainable energy societies. Although using proton (H+) conductors is an attractive choice, practical conductivity at intermediate temperatures (200-400 °C), which would be ideal for most energy and chemical conversion applications, remains a challenge. Alternatively, hydride ions (H-), that is, monovalent anions with high polarizability, can be considered a promising charge carrier that facilitates fast ionic conduction in solids. Here, we report a K2NiF4-type Ba-Li oxyhydride with an appreciable amount of hydrogen vacancies that presents long-range order at room temperature. Increasing the temperature results in the disappearance of the vacancy ordering, triggering a high and essentially temperature-independent H- conductivity of more than 0.01 S cm-1 above 315 °C. Such a remarkable H- conducting nature at intermediate temperatures is anticipated to be important for energy and chemical conversion devices.
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Affiliation(s)
- Fumitaka Takeiri
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
| | - Akihiro Watanabe
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori, Japan
| | - Kei Okamoto
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
| | - Dominic Bresser
- Université Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, Grenoble, France
- Helmholtz Institute Ulm, Ulm, Germany
- Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Sandrine Lyonnard
- Université Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, Grenoble, France
| | | | - Asad Ali
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
| | - Yumiko Imai
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan
| | - Masako Nishikawa
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan
| | - Masao Yonemura
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Japan
| | - Takashi Saito
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Japan
| | - Kazutaka Ikeda
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Japan
| | - Toshiya Otomo
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Japan
| | - Takashi Kamiyama
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Ibaraki, Japan
| | - Ryoji Kanno
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori, Japan
- Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan
| | - Genki Kobayashi
- Department of Materials Molecular Science, Institute for Molecular Science, Okazaki, Japan.
- The Graduate University for Advanced Studies, SOKENDAI, Hayama, Japan.
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12
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Fagerberg E, Lenton S, Nylander T, Seydel T, Skepö M. Self-Diffusive Properties of the Intrinsically Disordered Protein Histatin 5 and the Impact of Crowding Thereon: A Combined Neutron Spectroscopy and Molecular Dynamics Simulation Study. J Phys Chem B 2022; 126:789-801. [PMID: 35044776 PMCID: PMC8819652 DOI: 10.1021/acs.jpcb.1c08976] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
Intrinsically disordered
proteins (IDPs) are proteins that, in
comparison with globular/structured proteins, lack a distinct tertiary
structure. Here, we use the model IDP, Histatin 5, for studying its
dynamical properties under self-crowding conditions with quasi-elastic
neutron scattering in combination with full atomistic molecular dynamics
(MD) simulations. The aim is to determine the effects of crowding
on the center-of-mass diffusion as well as the internal diffusive
behavior. The diffusion was found to decrease significantly, which
we hypothesize can be attributed to some degree of aggregation at
higher protein concentrations, (≥100 mg/mL), as indicated by
recent small-angle X-ray scattering studies. Temperature effects are
also considered and found to, largely, follow Stokes–Einstein
behavior. Simple geometric considerations fail to accurately predict
the rates of diffusion, while simulations show semiquantitative agreement
with experiments, dependent on assumptions of the ratio between translational
and rotational diffusion. A scaling law that previously was found
to successfully describe the behavior of globular proteins was found
to be inadequate for the IDP, Histatin 5. Analysis of the MD simulations
show that the width of the distribution with respect to diffusion
is not a simplistic mirroring of the distribution of radius of gyration,
hence, displaying the particular features of IDPs that need to be
accounted for.
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Affiliation(s)
- Eric Fagerberg
- Theoretical Chemistry, Lund University, POB 124, SE-221 00 Lund, Sweden
| | - Samuel Lenton
- Physical Chemistry, Lund University, POB 124, SE-221 00 Lund, Sweden
| | - Tommy Nylander
- Physical Chemistry, Lund University, POB 124, SE-221 00 Lund, Sweden
| | - Tilo Seydel
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, CS 20156, F-38042 Grenoble, France
| | - Marie Skepö
- Theoretical Chemistry, Lund University, POB 124, SE-221 00 Lund, Sweden.,LINXS - Lund Institute of Advanced Neutron and X-ray Science, Scheelevägen 19, SE-223 70 Lund, Sweden
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13
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Mamontov E, Bordallo HN, Delaire O, Nickels J, Peters J, Schneider GJ, Smith JC, Sokolov AP. Broadband Wide-Angle VElocity Selector (BWAVES) neutron spectrometer designed for the SNS Second Target Station. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227202003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A recently proposed wide-angle velocity selector (WAVES) device for choosing the velocity of detected neutrons after they have been scattered by the sample paves the way for inverted geometry neutron spectrometers with continuously adjustable final neutron wavelength. BWAVES broadband inverted geometry spectrometer proposed for the Second Target Station at the Spallation Neutron Source at Oak Ridge National Laboratory is designed using WAVES to simultaneously probe dynamic processes spanning 4.5 decades in time (energy transfer). This makes BWAVES a uniquely flexible instrument which can be viewed as either a quasielasitc neutron scattering (QENS) spectrometer with a practically unlimited (overlapping with the vibrational excitations) range of energy transfers, or a broadband inelastic vibrational neutron spectrometer with QENS capabilities, including a range of accessible momentum transfer (Q) and a sufficiently high energy resolution at the elastic line. The new capabilities offered by BWAVES will expand the application of neutron scattering in ways not possible with existing neutron spectrometers.
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14
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Jansen M, Juranyi F, Yarema O, Seydel T, Wood V. Ligand Dynamics in Nanocrystal Solids Studied with Quasi-Elastic Neutron Scattering. ACS NANO 2021; 15:20517-20526. [PMID: 34878757 DOI: 10.1021/acsnano.1c09073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nanocrystal surfaces are commonly populated by organic ligands, which play a determining role in the optical, electronic, thermal, and catalytic properties of the individual nanocrystals and their assemblies. Understanding the bonding of ligands to nanocrystal surfaces and their dynamics is therefore important for the optimization of nanocrystals for different applications. In this study, we use temperature-dependent, quasi-elastic neutron scattering (QENS) to investigate the dynamics of different surface bound alkanethiols in lead sulfide nanocrystal solids. We select alkanethiols with mono- and dithiol terminations, as well as different backbone types and lengths. QENS spectra are collected both on a time-of-flight spectrometer and on a backscattering spectrometer, allowing us to investigate ligand dynamics in a time range from a few picoseconds to nanoseconds. Through model-based analysis of the QENS data, we find that ligands can either (1) precess around a central axis, while simultaneously rotating around their own molecular axis, or (2) only undergo uniaxial rotation with no precession. We establish the percentage of ligands undergoing each type of motion, the average relaxation times, and activation energies for these motions. We determine, for example, that dithiols which link facets of neighboring nanocrystals only exhibit uniaxial rotation and that longer ligands have higher activation energies and show smaller opening angles of precession due to stronger ligand-ligand interactions. Generally, this work provides insight into the arrangement and dynamics of ligands in nanocrystal solids, which is key to understanding their mechanical and thermal properties, and, more generally, highlights the potential of QENS for studying ligand behavior.
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Affiliation(s)
- Maximilian Jansen
- Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Fanni Juranyi
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Olesya Yarema
- Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Tilo Seydel
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Vanessa Wood
- Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
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15
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Girelli A, Beck C, Bäuerle F, Matsarskaia O, Maier R, Zhang F, Wu B, Lang C, Czakkel O, Seydel T, Schreiber F, Roosen-Runge F. Molecular Flexibility of Antibodies Preserved Even in the Dense Phase after Macroscopic Phase Separation. Mol Pharm 2021; 18:4162-4169. [PMID: 34637319 PMCID: PMC8564753 DOI: 10.1021/acs.molpharmaceut.1c00555] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Antibody therapies are typically based on high-concentration formulations that need to be administered subcutaneously. These conditions induce several challenges, inter alia a viscosity suitable for injection, sufficient solution stability, and preservation of molecular function. To obtain systematic insights into the molecular factors, we study the dynamics on the molecular level under strongly varying solution conditions. In particular, we use solutions of antibodies with poly(ethylene glycol), in which simple cooling from room temperature to freezing temperatures induces a transition from a well-dispersed solution into a phase-separated and macroscopically arrested system. Using quasi-elastic neutron scattering during in situ cooling ramps and in prethermalized measurements, we observe a strong decrease in antibody diffusion, while internal flexibility persists to a significant degree, thus ensuring the movement necessary for the preservation of molecular function. These results are relevant for a more dynamic understanding of antibodies in high-concentration formulations, which affects the formation of transient clusters governing the solution viscosity.
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Affiliation(s)
- Anita Girelli
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Christian Beck
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany.,Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Famke Bäuerle
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Olga Matsarskaia
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Ralph Maier
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Baohu Wu
- Jülich Centre for Neutron Science JCNS at MLZ, Forschungszentrum Jülich, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Christian Lang
- Jülich Centre for Neutron Science JCNS at MLZ, Forschungszentrum Jülich, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Orsolya Czakkel
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Tilo Seydel
- Institut Laue-Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Felix Roosen-Runge
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces (BRCB), Malmö University, 205 06 Malmö, Sweden
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16
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Mitra S, Sharma VK, Mukhopadhyay R. Diffusion of confined fluids in microporous zeolites and clay materials. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2021; 84:066501. [PMID: 33740783 DOI: 10.1088/1361-6633/abf085] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 03/19/2021] [Indexed: 06/12/2023]
Abstract
Fluids exhibit remarkable variation in their structural and dynamic properties when they are confined at the nanoscopic scale. Various factors, including geometric restriction, the size and shape of the guest molecules, the topology of the host, and guest-host interactions, are responsible for the alterations in these properties. Due to their porous structures, aluminosilicates provide a suitable host system for studying the diffusion of sorbates in confinement. Zeolites and clays are two classes of the aluminosilicate family, comprising very ordered porous or layered structures. Zeolitic materials are important due to their high catalytic activity and molecular sieving properties. Guest molecules adsorbed by zeolites display many interesting features including unidimensional diffusion, non-isotropic rotation, preferred orientation and levitation effects, depending on the guest and host characteristics. These are useful for the separation of hydrocarbons which commonly exist as mixtures in nature. Similarly, clay materials have found application in catalysis, desalination, enhanced oil recovery, and isolation barriers used in radioactive waste disposal. It has been shown that the bonding interactions, level of hydration, interlayer spacing, and number of charge-balancing cations are the important factors that determine the nature of diffusion of water molecules in clays. Here, we present a review of the current status of the diffusion mechanisms of various adsorbed species in different microporous zeolites and clays, as investigated using quasielastic neutron scattering and classical molecular dynamics simulation techniques. It is impossible to write an exhaustive review of the subject matter, as it has been explored over several decades and involves many research topics. However, an effort is made to cover the relevant issues specific to the dynamics of different molecules in microporous zeolites and clay materials and to highlight a variety of interesting features that are important for both practical applications and fundamental aspects.
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Affiliation(s)
- S Mitra
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - V K Sharma
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - R Mukhopadhyay
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
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17
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Ebersberger L, Schindler T, Kirsch SA, Pluhackova K, Schambony A, Seydel T, Böckmann RA, Unruh T. Lipid Dynamics in Membranes Slowed Down by Transmembrane Proteins. Front Cell Dev Biol 2020; 8:579388. [PMID: 33195218 PMCID: PMC7649217 DOI: 10.3389/fcell.2020.579388] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 09/22/2020] [Indexed: 11/13/2022] Open
Abstract
Lipids and proteins, as essential components of biological cell membranes, exhibit a significant degree of freedom for different kinds of motions including lateral long-range mobility. Due to their interactions, they not only preserve the cellular membrane but also contribute to many important cellular functions as e.g., signal transport or molecular exchange of the cell with its surrounding. Many of these processes take place on a short time (up to some nanoseconds) and length scale (up to some nanometers) which is perfectly accessible by quasielastic neutron scattering (QENS) experiments and molecular dynamics (MD) simulations. In order to probe the influence of a peptide, a transmembrane sequence of the transferrin receptor (TFRC) protein, on the dynamics of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) large unilamellar vesicles (LUVs) on a nanosecond time scale, high-resolution QENS experiments and complementary MD simulations have been utilized. By using different scattering contrasts in the experiment (chain-deuterated lipids and protonated lipids, respectively), a model could be developed which allows to examine the lipid and peptide dynamics separately. The experimental results revealed a restricted lipid lateral mobility in the presence of the TFRC transmembrane peptides. Also the apparent self-diffusion coefficient of the lateral movement of the peptide molecules could be determined quantitatively for the probed short-time regime. The findings could be confirmed very precisely by MD simulations. Furthermore, the article presents an estimation for the radius of influence of the peptides on the lipid long-range dynamics which could be determined by consistently combining results from experiment and simulation.
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Affiliation(s)
- Lisa Ebersberger
- Physics Department, Institute for Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Torben Schindler
- Physics Department, Institute for Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Sonja A Kirsch
- Computational Biology, Department Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Kristyna Pluhackova
- Computational Biology, Department Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Alexandra Schambony
- Department Biology, Chair of Developmental Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Tilo Seydel
- Science Division, Institut Laue-Langevin, Grenoble, France
| | - Rainer A Böckmann
- Computational Biology, Department Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Tobias Unruh
- Physics Department, Institute for Crystallography and Structural Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Physics Department, Center for Nanoanalysis and Electron Microscopy (CENEM) and Interdisciplinary Center for Nanostructured Films (IZNF), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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18
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Pounot K, Chaaban H, Foderà V, Schirò G, Weik M, Seydel T. Tracking Internal and Global Diffusive Dynamics During Protein Aggregation by High-Resolution Neutron Spectroscopy. J Phys Chem Lett 2020; 11:6299-6304. [PMID: 32663030 DOI: 10.1021/acs.jpclett.0c01530] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Proteins can misfold and form either amorphous or organized aggregates with different morphologies and features. Aggregates of amyloid nature are pathological hallmarks in so-called protein conformational diseases, including Alzheimer's and Parkinson's. Evidence prevails that the transient early phases of the reaction determine the aggregate morphology and toxicity. As a consequence, real-time monitoring of protein aggregation is of utmost importance. Here, we employed time-resolved neutron backscattering spectroscopy to follow center-of-mass self-diffusion and nano- to picosecond internal dynamics of lysozyme during aggregation into a specific β-sheet rich superstructure, called particulates, formed at the isoelectric point of the protein. Particulate formation is found to be a one-step process, and protein internal dynamics, to remain unchanged during the entire aggregation process. The time-resolved neutron backscattering spectroscopy approach developed here, in combination with standard kinetics assays, provides a unifying framework in which dynamics and conformational transitions can be related to the different aggregation pathways.
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Affiliation(s)
- Kevin Pounot
- Université Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale, F-38000 Grenoble, France
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, CS 20156, F-38042 Grenoble cedex 9, France
| | - Hussein Chaaban
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Vito Foderà
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Giorgio Schirò
- Université Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale, F-38000 Grenoble, France
| | - Martin Weik
- Université Grenoble Alpes, CEA, CNRS, Institut de Biologie Structurale, F-38000 Grenoble, France
| | - Tilo Seydel
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, CS 20156, F-38042 Grenoble cedex 9, France
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19
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Russo D, Pelosi C, Wurm FR, Frick B, Ollivier J, Teixeira J. Insight into Protein-Polymer Conjugate Relaxation Dynamics: The Importance of Polymer Grafting. Macromol Biosci 2020; 20:e1900410. [PMID: 32285628 DOI: 10.1002/mabi.201900410] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 03/27/2020] [Indexed: 01/03/2023]
Abstract
The bio and chemical physics of protein-polymer conjugates are related to parameters that characterize each component. With this work, it is intended to feature the dynamical properties of the protein-polymer conjugate myoglobin (Mb)-poly(ethyl ethylene phosphate), in the ps and ns time scales, in order to understand the respective roles of the protein and of the polymer size in the dynamics of the conjugate. Elastic and quasi-elastic neutron scattering is performed on completely hydrogenated samples with variable number of polymer chains covalently attached to the protein. The role of the polymer length in the protein solvation and internal dynamics is investigated using two conjugates formed by polymers of different molecular weight. It is confirmed that the flexibility of the complex increases with the number of grafted polymer chains and that a sharp dynamical transition appears when either grafting density or polymer molecular weight are high. It is shown that protein size is crucial for the polymer structural organization and interaction on the protein surface and it is established that the glass properties of the polymer change upon conjugation. The results give a better insight of the equivalence of the polymer coating and the role of water on the surface of proteins.
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Affiliation(s)
- Daniela Russo
- Consiglio Nazionale delle Ricerche & Istituto Officina dei Materiali c/o Institut Laue Langevin, Grenoble, 38042, France.,Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW, 2234, Australia
| | - Chiara Pelosi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi, Pisa, 56124, Italy
| | - Frederik R Wurm
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, Mainz, 55128, Germany
| | | | | | - Jose Teixeira
- Laboratoire Léon Brillouin (CEA/CNRS), CEA Saclay, Gif-sur-Yvette Cedex, 91191, France
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20
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Edkins RM, Appel M, Seydel T, Edkins K. The modifying effect of supramolecular gel fibres on the diffusion of paracetamol and ibuprofen sodium on the picosecond timescale. Phys Chem Chem Phys 2020; 22:10838-10844. [DOI: 10.1039/d0cp01240h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quasi-elastic neutron spectroscopy reveals that model drug molecules diffuse faster in a supramolecular gel than in solution.
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Affiliation(s)
- Robert M. Edkins
- WestCHEM Department of Pure and Applied Chemistry
- Thomas Graham Building
- University of Strathclyde
- Glasgow G1 1XL
- UK
| | - Markus Appel
- Institut Max von Laue – Paul Langevin (ILL)
- F-38042 Grenoble
- France
| | - Tilo Seydel
- Institut Max von Laue – Paul Langevin (ILL)
- F-38042 Grenoble
- France
| | - Katharina Edkins
- Division of Pharmacy and Optometry
- University of Manchester
- Manchester M13 9PT
- UK
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21
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Mamontov E, Osti NC, Tyagi M. Temperature dependence of nanoscale dynamic processes measured in living millipedes by high resolution inelastic and elastic neutron scattering. Sci Rep 2019; 9:11646. [PMID: 31406234 PMCID: PMC6691110 DOI: 10.1038/s41598-019-48270-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 08/01/2019] [Indexed: 12/12/2022] Open
Abstract
We have used high energy-resolution neutron scattering to probe nanoscale dynamic processes in living millipedes (Narceus americanus). We have measured the temperature dependence of the intensity of scattered neutrons that do not exchange energy with the living samples on the 1.5 ns time scale, thereby excluding the signal from the highly mobile intra- and extra-cellular bulk-like aqueous constituents in the sample. This measured “elastic” scattering intensity exhibits a non-monotonic temperature dependence, with a noticeable systematic decrease detected between 295 and 303 K on warming up from 283 to 310 K. This decrease demonstrates an excellent inverse correlation with the non-monotonic, as a function of temperature, increase in the slow diffusivity previously observed in planarian flatworms and housefly larvae. This correlation suggests the existence of a biological mechanism, possibly common between different classes (Insects and Myriapods) and even phyla (Arthropods and Platyhelminthes), that dampens the slow nanoscopic dynamics in ectothermic organisms in response to the temperature of the environment exceeding the physiologically optimal range.
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Affiliation(s)
- Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research and University of Maryland, Gaithersburg, Maryland, 20899, USA
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22
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Abstract
AbstractThe dynamics of proteins in solution includes a variety of processes, such as backbone and side-chain fluctuations, interdomain motions, as well as global rotational and translational (i.e. center of mass) diffusion. Since protein dynamics is related to protein function and essential transport processes, a detailed mechanistic understanding and monitoring of protein dynamics in solution is highly desirable. The hierarchical character of protein dynamics requires experimental tools addressing a broad range of time- and length scales. We discuss how different techniques contribute to a comprehensive picture of protein dynamics, and focus in particular on results from neutron spectroscopy. We outline the underlying principles and review available instrumentation as well as related analysis frameworks.
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23
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Al-Ayoubi SR, Schummel PH, Cisse A, Seydel T, Peters J, Winter R. Osmolytes modify protein dynamics and function of tetrameric lactate dehydrogenase upon pressurization. Phys Chem Chem Phys 2019; 21:12806-12817. [PMID: 31165827 DOI: 10.1039/c9cp02310k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We present a study of the combined effects of natural cosolvents (TMAO, glycine, urea) and pressure on the activity of the tetrameric enzyme lactate dehydrogenase (LDH). To this end, high-pressure stopped-flow methodology in concert with fast UV/Vis spectroscopic detection of product formation was applied. To reveal possible pressure effects on the stability and dynamics of the enzyme, FTIR spectroscopic and neutron scattering measurements were carried out. In neat buffer solution, the catalytic turnover number of the enzyme, kcat, increases up to 1000 bar, the pressure range where dissociation of the tetrameric species to dimers sets in. Accordingly, we obtain a negative activation volume, ΔV# = -45.3 mL mol-1. Further, the enzyme substrate complex has a larger volume compared to the enzyme and substrate in the unbound state. The neutron scattering data show that changes in the fast internal dynamics of the enzyme are not responsible for the increase of kcat upon compression. Whereas the magnitude of kcat is similar in the presence of the osmolytes, the pressure of deactivation is modulated by the addition of cosolvents. TMAO and glycine increase the pressure of deactivation, and in accordance with the observed stabilizing effect both cosolvents exhibit against denaturation and/or dissociation of proteins. While urea does not markedly affect the magnitude of the Michaelis constant, KM, both 1 M TMAO and 1 M glycine exhibit smaller KM values of about 0.07 mM and 0.05 mM below about 1 kbar. Such positive effect on the substrate affinity could be rationalized by the effect the two cosolutes impose on the thermodynamic activities of the reactants, which reflect changes in water-mediated intermolecular interactions. Our data show that the intracellular milieu, i.e., the solution conditions that have evolved, may be sufficient to maintain enzymatic activity under extreme environmental conditions, including the whole pressure range encountered on Earth.
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Affiliation(s)
- Samy R Al-Ayoubi
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Str. 4a, 44227 Dortmund, Germany.
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24
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Grimaldo M, Lopez H, Beck C, Roosen-Runge F, Moulin M, Devos JM, Laux V, Härtlein M, Da Vela S, Schweins R, Mariani A, Zhang F, Barrat JL, Oettel M, Forsyth VT, Seydel T, Schreiber F. Protein Short-Time Diffusion in a Naturally Crowded Environment. J Phys Chem Lett 2019; 10:1709-1715. [PMID: 30897330 DOI: 10.1021/acs.jpclett.9b00345] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The interior of living cells is a dense and polydisperse suspension of macromolecules. Such a complex system challenges an understanding in terms of colloidal suspensions. As a fundamental test we employ neutron spectroscopy to measure the diffusion of tracer proteins (immunoglobulins) in a cell-like environment (cell lysate) with explicit control over crowding conditions. In combination with Stokesian dynamics simulation, we address protein diffusion on nanosecond time scales where hydrodynamic interactions dominate over negligible protein collisions. We successfully link the experimental results on these complex, flexible molecules with coarse-grained simulations providing a consistent understanding by colloid theories. Both experiments and simulations show that tracers in polydisperse solutions close to the effective particle radius Reff = ⟨ Ri3⟩1/3 diffuse approximately as if the suspension was monodisperse. The simulations further show that macromolecules of sizes R > Reff ( R < Reff) are slowed more (less) effectively even at nanosecond time scales, which is highly relevant for a quantitative understanding of cellular processes.
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Affiliation(s)
- Marco Grimaldo
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Hender Lopez
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
- Institut für Angewandte Physik , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
- LiPhy , 38402 Saint Martin d'Hères , France
| | - Christian Beck
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
- Institut für Angewandte Physik , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Felix Roosen-Runge
- Division of Physical Chemistry , Lund University , Naturvetarvägen 14 , 22100 Lund , Sweden
| | - Martine Moulin
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Juliette M Devos
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Valerie Laux
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Michael Härtlein
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Stefano Da Vela
- Institut für Angewandte Physik , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Ralf Schweins
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Alessandro Mariani
- European Synchrotron Radiation Facility (ESRF) , CS 40220, F-38042 Grenoble Cedex 9, France
| | - Fajun Zhang
- Institut für Angewandte Physik , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | | | - Martin Oettel
- Institut für Angewandte Physik , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - V Trevor Forsyth
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
- Faculty of Natural Sciences & Institute for Science and Technology in Medicine , Keele University , Staffordshire ST5 5BG , United Kingdom
| | - Tilo Seydel
- Institut Max von Laue - Paul Langevin (ILL) , CS 20156, F-38042 Grenoble Cedex 9, France
| | - Frank Schreiber
- Institut für Angewandte Physik , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
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25
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Golub M, Guillon V, Gotthard G, Zeller D, Martinez N, Seydel T, Koza MM, Lafaye C, Clavel D, von Stetten D, Royant A, Peters J. Dynamics of a family of cyan fluorescent proteins probed by incoherent neutron scattering. J R Soc Interface 2019; 16:20180848. [PMID: 30836899 DOI: 10.1098/rsif.2018.0848] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Cyan fluorescent proteins (CFPs) are variants of green fluorescent proteins in which the central tyrosine of the chromophore has been replaced by a tryptophan. The increased bulk of the chromophore within a compact protein and the change in the positioning of atoms capable of hydrogen bonding have made it difficult to optimize their fluorescence properties, which took approximately 15 years between the availability of the first useable CFP, enhanced cyan fluorescent protein (ECFP), and that of a variant with almost perfect fluorescence efficiency, mTurquoise2. To understand the molecular bases of the progressive improvement in between these two CFPs, we have studied by incoherent neutron scattering the dynamics of five different variants exhibiting progressively increased fluorescence efficiency along the evolution pathway. Our results correlate well with the analysis of the previously determined X-ray crystallographic structures, which show an increase in flexibility between ECFP and the second variant, Cerulean, which is then hindered in the three later variants, SCFP3A (Super Cyan Fluorescent Protein 3A), mTurquoise and mTurquoise2. This confirms that increasing the rigidity of the direct environment of the fluorescent chromophore is not the sole parameter leading to brighter fluorescent proteins and that increased flexibility in some cases may be helpful.
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Affiliation(s)
- Maksym Golub
- 1 Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9 , France.,2 Univ. Grenoble Alpes, CNRS, CEA, IBS (Institut de Biologie Structurale) , 38000 Grenoble , France
| | - Virginia Guillon
- 2 Univ. Grenoble Alpes, CNRS, CEA, IBS (Institut de Biologie Structurale) , 38000 Grenoble , France
| | | | - Dominik Zeller
- 1 Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9 , France.,4 Laboratoire Interdisciplinaire de Physique, Univ. Grenoble Alpes, CNRS , 38000 Grenoble , France
| | - Nicolas Martinez
- 1 Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9 , France.,2 Univ. Grenoble Alpes, CNRS, CEA, IBS (Institut de Biologie Structurale) , 38000 Grenoble , France
| | - Tilo Seydel
- 1 Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9 , France
| | - Michael M Koza
- 1 Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9 , France
| | - Céline Lafaye
- 2 Univ. Grenoble Alpes, CNRS, CEA, IBS (Institut de Biologie Structurale) , 38000 Grenoble , France
| | - Damien Clavel
- 2 Univ. Grenoble Alpes, CNRS, CEA, IBS (Institut de Biologie Structurale) , 38000 Grenoble , France
| | | | - Antoine Royant
- 2 Univ. Grenoble Alpes, CNRS, CEA, IBS (Institut de Biologie Structurale) , 38000 Grenoble , France.,3 European Synchrotron Radiation Facility , 38043 Grenoble , France
| | - Judith Peters
- 1 Institut Laue Langevin , 71 avenue des Martyrs, 38042 Grenoble Cedex 9 , France.,4 Laboratoire Interdisciplinaire de Physique, Univ. Grenoble Alpes, CNRS , 38000 Grenoble , France
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26
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Beck C, Grimaldo M, Roosen-Runge F, Braun MK, Zhang F, Schreiber F, Seydel T. Nanosecond Tracer Diffusion as a Probe of the Solution Structure and Molecular Mobility of Protein Assemblies: The Case of Ovalbumin. J Phys Chem B 2018; 122:8343-8350. [PMID: 30106587 DOI: 10.1021/acs.jpcb.8b04349] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Protein diffusion is not only an important process ensuring biological function but can also be used as a probe to obtain information on structural properties of protein assemblies in liquid solutions. Here, we explore the oligomerization state of ovalbumin at high protein concentrations by means of its short-time self-diffusion. We employ high-resolution incoherent quasielastic neutron scattering to access the self-diffusion on nanosecond timescales, on which interparticle contacts are not altered. Our results indicate that ovalbumin in aqueous (D2O) solutions occurs in increasingly large assemblies of its monomeric subunits with rising protein concentration. It changes from nearly monomeric toward dimeric and ultimately larger than tetrameric complexes. Simultaneously, we access information on the internal molecular mobility of ovalbumin on the nanometer length scale and compare it with results obtained for bovine serum albumin, immunoglobulin, and β-lactoglobulin.
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Affiliation(s)
- Christian Beck
- Institut Max von Laue-Paul Langevin (ILL) , B.P.156, F-38042 Grenoble , France.,Institut für Angewandte Physik , Universität Tübingen , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Marco Grimaldo
- Institut Max von Laue-Paul Langevin (ILL) , B.P.156, F-38042 Grenoble , France
| | - Felix Roosen-Runge
- Division of Physical Chemistry, Department of Chemistry , Lund University , Naturvetarvägen 16 , SE-22100 Lund , Sweden
| | - Michal K Braun
- Institut für Angewandte Physik , Universität Tübingen , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Fajun Zhang
- Institut für Angewandte Physik , Universität Tübingen , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Frank Schreiber
- Institut für Angewandte Physik , Universität Tübingen , Auf der Morgenstelle 10 , 72076 Tübingen , Germany
| | - Tilo Seydel
- Institut Max von Laue-Paul Langevin (ILL) , B.P.156, F-38042 Grenoble , France
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27
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Demmel F, McPhail D, French C, Maxwell D, Harrison S, Boxall J, Rhodes N, Mukhopadhyay S, Silverwood I, Sakai VG, Fernandez-Alonso F. ToF-Backscattering spectroscopy at the ISIS Facility: Status and Perspectives. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1742-6596/1021/1/012027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Berg MC, Benetti AR, Telling MTF, Seydel T, Yu D, Daemen LL, Bordallo HN. Nanoscale Mobility of Aqueous Polyacrylic Acid in Dental Restorative Cements. ACS APPLIED MATERIALS & INTERFACES 2018; 10:9904-9915. [PMID: 29504390 DOI: 10.1021/acsami.7b15735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hydrogen dynamics in a time range from hundreds of femtoseconds to nanoseconds can be directly analyzed using neutron spectroscopy, where information on the inelastic and quasi-elastic scattering, hereafter INS and QENS, can be obtained. In this study, we applied these techniques to understand how the nanoscale mobility of the aqueous solution of polyacrylic acid (PAA) used in conventional glass ionomer cements (GICs) changes under confinement. Combining the spectroscopic analysis with calorimetric results, we were able to separate distinct motions within both the liquid and the GICs. The QENS analysis revealed that the self-diffusion translational motion identified in the liquid is also visible in the GIC. However, as a result of the formation of the cement matrix and its setting, both translational diffusion and residence time differed from the PAA solution. When comparing the local diffusion obtained for the selected GIC, the only noticeable difference was observed for the slow dynamics associated with the polymer chain. Additionally, over short-term aging, progressive water binding to the polymer chain occurred in one of the investigated GICs. Finally, a considerable change in the density of the GIC without progressive water binding indicates an increased polymer cross-linking. Taken together, our results suggest that accurate and deep understanding of polymer-water binding, polymer cross-linking, as well as material density changes occurring during the maturation process of GIC are necessary for the development of advanced dental restorative materials.
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Affiliation(s)
- Marcella C Berg
- The Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
- European Spallation Source ESS ERIC , P.O. Box 176 , SE-221 00 Lund , Sweden
| | - Ana R Benetti
- Department of Odontology, Faculty of Health and Medical Sciences , University of Copenhagen , DK-2200 Copenhagen , Denmark
| | - Mark T F Telling
- ISIS Facility , Rutherford Appleton Laboratory , Chilton, Oxford OX11 0QX , U.K
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , U.K
| | - Tilo Seydel
- Institut Max von Laue-Paul Langevin , CS 20156 , F-38042 Grenoble , France
| | - Dehong Yu
- Australian Nuclear Science and Technology Organisation , New Illawarra Road , Lucas Heights , New South Wales 2234 , Australia
| | - Luke L Daemen
- Oak Ridge National Laboratory , P.O. Box 2008 , Oak Ridge , Tennessee 37831 , United States
| | - Heloisa N Bordallo
- The Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
- European Spallation Source ESS ERIC , P.O. Box 176 , SE-221 00 Lund , Sweden
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29
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Malo de Molina P, Alvarez F, Frick B, Wildes A, Arbe A, Colmenero J. Investigation of the dynamics of aqueous proline solutions using neutron scattering and molecular dynamics simulations. Phys Chem Chem Phys 2017; 19:27739-27754. [PMID: 28984889 DOI: 10.1039/c7cp05474b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We applied quasielastic neutron scattering (QENS) techniques to samples with two different contrasts (deuterated solute/hydrogenated solvent and the opposite label) to selectively study the component dynamics of proline/water solutions. Results on diluted and concentrated solutions (31 and 6 water molecules/proline molecule, respectively) were analyzed in terms of the susceptibility and considering a recently proposed model for water dynamics [Arbe et al., Phys. Rev. Lett., 2016, 117, 185501] which includes vibrations and the convolution of localized motions and diffusion. We found that proline molecules not only reduce the average diffusion coefficient of water but also extend the time/frequency range of the crossover region ('cage') between the vibrations and purely diffusive behavior. For the high proline concentration we also found experimental evidence of water heterogeneous dynamics and a distribution of diffusion coefficients. Complementary molecular dynamics simulations show that water molecules start to perform rotational diffusion when they escape the cage regime but before the purely diffusive behavior is established. The rotational diffusion regime is also retarded by the presence of proline molecules. On the other hand, a strong coupling between proline and water diffusive dynamics which persists with decreasing temperature is directly observed using QENS. Not only are the temperature dependences of the diffusion coefficients of both components the same, but their absolute values also approach each other with increasing proline concentration. We compared our results with those reported using other techniques, in particular using dielectric spectroscopy (DS). A simple approach based on molecular hydrodynamics and a molecular treatment of DS allows rationalizing the a priori puzzling inconsistency between QENS and dielectric results regarding the dynamic coupling of the two components. The interpretation proposed is based on general grounds and therefore should be applicable to other biomolecular solutions.
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Affiliation(s)
- Paula Malo de Molina
- Centro de Física de Materiales (CFM) (CSIC-UPV/EHU) - Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain.
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30
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Dynamic processes in biological membrane mimics revealed by quasielastic neutron scattering. Chem Phys Lipids 2017; 206:28-42. [DOI: 10.1016/j.chemphyslip.2017.05.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 05/22/2017] [Accepted: 05/25/2017] [Indexed: 12/15/2022]
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31
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Braun MK, Grimaldo M, Roosen-Runge F, Hoffmann I, Czakkel O, Sztucki M, Zhang F, Schreiber F, Seydel T. Crowding-Controlled Cluster Size in Concentrated Aqueous Protein Solutions: Structure, Self- and Collective Diffusion. J Phys Chem Lett 2017; 8:2590-2596. [PMID: 28525282 DOI: 10.1021/acs.jpclett.7b00658] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We investigate the concentration-controlled formation of clusters in β-lactoglobulin (BLG) protein solutions combining structural and dynamical scattering techniques. The static structure factor from small-angle X-ray scattering as well as de-Gennes narrowing in the nanosecond diffusion function D(q) from neutron spin echo spectroscopy support a picture of cluster formation. Using neutron backscattering spectroscopy, a monotonous increase of the average hydrodynamic cluster radius is monitored over a broad protein concentration range, corresponding to oligomeric structures of BLG ranging from the native dimers up to roughly four dimers. The results suggest that BLG forms compact clusters that are static on the observation time scale of several nanoseconds. The presented analysis provides a general framework to access the structure and dynamics of macromolecular assemblies in solution.
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Affiliation(s)
- Michal K Braun
- Institut für Angewandte Physik, Universität Tübingen , Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Marco Grimaldo
- Institut für Angewandte Physik, Universität Tübingen , Auf der Morgenstelle 10, 72076 Tübingen, Germany
- Institut Laue-Langevin , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Felix Roosen-Runge
- Institut Laue-Langevin , 71 Avenue des Martyrs, 38000 Grenoble, France
- Division of Physical Chemistry, Department of Chemistry, Lund University , Naturvetarvägen 14, 221 00 Lund, Sweden
| | - Ingo Hoffmann
- Institut Laue-Langevin , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Orsolya Czakkel
- Institut Laue-Langevin , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Michael Sztucki
- ESRF - The European Synchrotron , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen , Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen , Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Tilo Seydel
- Institut Laue-Langevin , 71 Avenue des Martyrs, 38000 Grenoble, France
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32
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Misuraca L, Natali F, da Silva L, Peters J, Demé B, Ollivier J, Seydel T, Laux-Lesourd V, Haertlein M, Zaccai G, Deamer D, Maurel MC. Mobility of a Mononucleotide within a Lipid Matrix: A Neutron Scattering Study. Life (Basel) 2017; 7:life7010002. [PMID: 28054992 PMCID: PMC5370402 DOI: 10.3390/life7010002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/23/2016] [Accepted: 12/29/2016] [Indexed: 11/16/2022] Open
Abstract
An essential question in studies on the origins of life is how nucleic acids were first synthesized and then incorporated into compartments about 4 billion years ago. A recent discovery is that guided polymerization within organizing matrices could promote a non-enzymatic condensation reaction allowing the formation of RNA-like polymers, followed by encapsulation in lipid membranes. Here, we used neutron scattering and deuterium labelling to investigate 5′-adenosine monophosphate (AMP) molecules captured in a multilamellar phospholipid matrix. The aim of the research was to determine and compare how mononucleotides are captured and differently organized within matrices and multilamellar phospholipid structures and to explore the role of water in organizing the system to determine at which level the system becomes sufficiently anhydrous to lock the AMP molecules into an organized structure and initiate ester bond synthesis. Elastic incoherent neutron scattering experiments were thus employed to investigate the changes of the dynamic properties of AMP induced by embedding the molecules within the lipid matrix. The influence of AMP addition to the lipid membrane organization was determined through diffraction measurement, which also helped us to define the best working Q range for dynamical data analysis with respect to specific hydration. The use of different complementary instruments allowed coverage of a wide time-scale domain, from ns to ps, of atomic mean square fluctuations, providing evidence of a well-defined dependence of the AMP dynamics on the hydration level.
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Affiliation(s)
- Loreto Misuraca
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, Ed. 17, 90128 Palermo, Italy.
| | - Francesca Natali
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Research Unit in Grenoble, 71 Avenue des Martyrs, 38000 Grenoble, France.
| | - Laura da Silva
- Institut de Systematique, Évolution, Biodiversité, (ISYEB) UMR 7205 CNRS-MNHN-UPMC-EPHE Sorbonne Universités, CP50, 57 rue Cuvier, 75005 Paris, France.
| | - Judith Peters
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
- Université Grenoble Alpes (UGA), UFR PhITEM, 621 Avenue Centrale, 38000 Grenoble, France.
| | - Bruno Demé
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
| | - Jacques Ollivier
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
| | - Tilo Seydel
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
| | | | - Michael Haertlein
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
| | - Giuseppe Zaccai
- Institut Laue Langevin (ILL), 71, Avenue des Martyrs, 38000 Grenoble, France.
- Institut de Biologie Structurale (IBS), 71 Avenue des Martyrs, 38000 Grenoble, France.
- Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 17 Avenue des Martyrs, 38054 Grenoble, France.
- Centre National de la Recherche Scientifique (CNRS), 25 Avenue des Martyrs, 38000 Grenoble, France.
| | - David Deamer
- University of California, Santa Cruz, CA 95060, USA.
| | - Marie Christine Maurel
- Institut de Systematique, Évolution, Biodiversité, (ISYEB) UMR 7205 CNRS-MNHN-UPMC-EPHE Sorbonne Universités, CP50, 57 rue Cuvier, 75005 Paris, France.
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33
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Andersson CD, Martinez N, Zeller D, Rondahl SH, Koza MM, Frick B, Ekström F, Peters J, Linusson A. Changes in dynamics of α-chymotrypsin due to covalent inhibitors investigated by elastic incoherent neutron scattering. Phys Chem Chem Phys 2017; 19:25369-25379. [DOI: 10.1039/c7cp04041e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dynamics of chymotrypsin increases when bound to two different covalent inhibitors. These effects were analyzed by univariate and multivariate methods.
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Affiliation(s)
| | - N. Martinez
- Institut Laue Langevin
- F-38042 Grenoble Cedex 9
- France
- Univ. Grenoble Alpes
- IBS and LiPhy
| | - D. Zeller
- Institut Laue Langevin
- F-38042 Grenoble Cedex 9
- France
- Univ. Grenoble Alpes
- IBS and LiPhy
| | - S. H. Rondahl
- CBRN Defence and Security
- Swedish Defence Research Agency
- SE-90621 Umeå
- Sweden
| | - M. M. Koza
- Institut Laue Langevin
- F-38042 Grenoble Cedex 9
- France
| | - B. Frick
- Institut Laue Langevin
- F-38042 Grenoble Cedex 9
- France
| | - F. Ekström
- CBRN Defence and Security
- Swedish Defence Research Agency
- SE-90621 Umeå
- Sweden
| | - J. Peters
- Institut Laue Langevin
- F-38042 Grenoble Cedex 9
- France
- Univ. Grenoble Alpes
- IBS and LiPhy
| | - A. Linusson
- Department of Chemistry
- Umeå University
- SE-90187 Umeå
- Sweden
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34
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Melchior JP, Frick B. On the nanosecond proton dynamics in phosphoric acid–benzimidazole and phosphoric acid–water mixtures. Phys Chem Chem Phys 2017; 19:28540-28554. [DOI: 10.1039/c7cp04116k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Combining 1H-NMR, 17O-NMR, and high-resolution backscattering QENS hydrodynamic and structural proton transport in phosphoric acid is separated. The rate limiting steps for structural proton diffusion in mixtures of acid with Brønsted bases are found to occur below the nanosecond timescale.
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Tsapatsaris N, Lechner RE, Markó M, Bordallo HN. Conceptual design of the time-of-flight backscattering spectrometer, MIRACLES, at the European Spallation Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:085118. [PMID: 27587171 DOI: 10.1063/1.4961569] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this work, we present the conceptual design of the backscattering time-of-flight spectrometer MIRACLES approved for construction at the long-pulse European Spallation Source (ESS). MIRACLES's unparalleled combination of variable resolution, high flux, extended energy, and momentum transfer (0.2-6 Å(-1)) ranges will open new avenues for neutron backscattering spectroscopy. Its remarkable flexibility can be attributed to 3 key elements: the long-pulse time structure and low repetition rate of the ESS neutron source, the chopper cascade that tailors the moderator pulse in the primary part of the spectrometer, and the bent Si(111) analyzer crystals arranged in a near-backscattering geometry in the secondary part of the spectrometer. Analytical calculations combined with instrument Monte-Carlo simulations show that the instrument will provide a variable elastic energy resolution, δ(ħ ω), between 2 and 32 μeV, when using a wavelength of λ ≈ 6.267 Å (Si(111)-reflection), with an energy transfer range, ħ ω, centered at the elastic line from -600 to +600 μeV. In addition, when selecting λ ≈ 2.08 Å (i.e., the Si(333)-reflection), δ(ħ ω) can be relaxed to 300 μeV and ħ ω from about 10 meV in energy gain to ca -40 meV in energy loss. Finally, the dynamic wavelength range of MIRACLES, approximately 1.8 Å, can be shifted within the interval of 2-20 Å to allow the measurement of low-energy inelastic excitations.
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Affiliation(s)
- N Tsapatsaris
- Niels Bohr Institute, The University of Copenhagen, Copenhagen 2100, Denmark
| | - R E Lechner
- European Spallation Source ERIC, Tunavägen 24, 22100 Lund, Sweden
| | - M Markó
- Neutron Spectroscopy Department, Wigner Research Centre for Physics, H-1525 Budapest, Hungary
| | - H N Bordallo
- Niels Bohr Institute, The University of Copenhagen, Copenhagen 2100, Denmark
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Mitra S, Sharma VK, Garcia-Sakai V, Orecchini A, Seydel T, Johnson M, Mukhopadhyay R. Enhancement of Lateral Diffusion in Catanionic Vesicles during Multilamellar-to-Unilamellar Transition. J Phys Chem B 2016; 120:3777-84. [PMID: 27029782 DOI: 10.1021/acs.jpcb.6b02997] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Catanionic vesicles are formed spontaneously by mixing cationic and anionic dispersions in aqueous solution in suitable conditions. Because of spontaneity in formation, long-term stability, and easy modulation of size and charge, they have numerous advantages over conventional lipid-based vesicles. The dynamics of such vesicles is of interest in the field of biomedicine, as they can be used to deliver drug molecules into the cell membrane. Dynamics of catanionic vesicles based on sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) have been studied using incoherent elastic and quasielastic neutron scattering (QENS) techniques. Neutron scattering experiments have been carried out on two backscattering spectrometers, IRIS and IN16B, which have different energy resolutions and energy transfer windows. An elastic fixed-window scan carried out using IN16B shows a phase transition at ∼307 K during the heating cycle, whereas on cooling the transition occurred at ∼294 K. DSC results are found to be in close agreement with the elastic scan data. This transition is ascribed to a structural rearrangement from a multilamellar to a unilamellar phase [ Andreozzi J. Phys. Chem. B 2010 , 114 , 8056 - 8060 ]. It is found that a model in which the surfactant molecules undergo both lateral and internal motions can describe the QENS data quite well. While the data from IRIS have contributions from both dynamical processes, the data from IN16B probe only lateral motions, as the internal motions are too fast for the energy window of the spectrometer. It is found that, through the transition, the fraction of surfactant molecules undergoing lateral motion increases of a factor of 2 from the multilamellar to the unilamellar phase, indicating an enhanced fluidity of the latter. The lateral motion is found to be Fickian in nature, while the internal motion has been described by a localized translational diffusion model. The results reported here could have direct interest for a number of applications, such as molecular transport, and the effect of specific drug molecules or hormones through the membrane.
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Affiliation(s)
- S Mitra
- Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai, 40085, India
| | - V K Sharma
- Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai, 40085, India
| | - V Garcia-Sakai
- Rutherford Appleton Laboratory, Science and Technology Facilities Council , Didcot OX11 0QX, U.K
| | - A Orecchini
- Dipartimento di Fisica e Geologia, Università di Perugia , Via Pascoli, I-06123 Perugia, Italy
| | - T Seydel
- Institut Laue-Langevin , BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - M Johnson
- Institut Laue-Langevin , BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - R Mukhopadhyay
- Solid State Physics Division, Bhabha Atomic Research Centre , Mumbai, 40085, India
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Grimaldo M, Roosen-Runge F, Jalarvo N, Zamponi M, Zanini F, Hennig M, Zhang F, Schreiber F, Seydel T. High-resolution neutron spectroscopy on protein solution samples. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158302005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Grimaldo M, Roosen-Runge F, Zhang F, Seydel T, Schreiber F. Diffusion and Dynamics of γ-Globulin in Crowded Aqueous Solutions. J Phys Chem B 2014; 118:7203-9. [DOI: 10.1021/jp504135z] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Marco Grimaldo
- Institut Max von Laue − Paul Langevin (ILL), B.P.156, F-38042 Grenoble, France
- Institut
für Angewandte Physik, Universität Tübingen, Auf
der Morgenstelle 10, D-72076 Tübingen, Germany
| | - Felix Roosen-Runge
- Institut Max von Laue − Paul Langevin (ILL), B.P.156, F-38042 Grenoble, France
| | - Fajun Zhang
- Institut
für Angewandte Physik, Universität Tübingen, Auf
der Morgenstelle 10, D-72076 Tübingen, Germany
| | - Tilo Seydel
- Institut Max von Laue − Paul Langevin (ILL), B.P.156, F-38042 Grenoble, France
| | - Frank Schreiber
- Institut
für Angewandte Physik, Universität Tübingen, Auf
der Morgenstelle 10, D-72076 Tübingen, Germany
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Hill AH, Jacobsen H, Stewart JR, Jiao F, Jensen NP, Holm SL, Mutka H, Seydel T, Harrison A, Lefmann K. Magnetic properties of nano-scale hematite, α-Fe2O3, studied by time-of-flight inelastic neutron spectroscopy. J Chem Phys 2014; 140:044709. [DOI: 10.1063/1.4862235] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hennig M, Frick B, Seydel T. Optimum velocity of a phase-space transformer for cold-neutron backscattering spectroscopy. J Appl Crystallogr 2011. [DOI: 10.1107/s0021889811013227] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Cold-neutron backscattering spectrometers are designed for inelastic neutron scattering experiments at a high energy resolution, where 0.5 µeV FWHM can routinely be achieved at the incident wavelength λ ≃ 6.3 Å. The phase-space transformation (PST) technique can be used to enhance the neutron flux at the sample position of such backscattering spectrometers at the expense of an acceptable increase of the beam divergence. Technically, the PST is achieved by a rotating disc carrying mosaic crystals on its circumference. Here a new analytical framework to describe the Bragg reflection of a divergent polychromatic beam from a moving mosaic crystal is discussed. Results obtained using this framework are compared with detailed Monte Carlo numerical simulations. The results presented here provide a deeper understanding of the PST and in particular of the optimum circumferential crystal speed of a PST device.
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Calvo-Almazán I, Seydel T, Fouquet P. Questions arising for future surface diffusion studies using scattering techniques--the case of benzene diffusion on graphite basal plane surfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:304014. [PMID: 21399346 DOI: 10.1088/0953-8984/22/30/304014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This paper gives a review of recent work on benzene diffusion on graphitic carbon surfaces using neutron and helium scattering spectroscopy as well as computational modelling. Recent spin-echo spectroscopy measurements have demonstrated that benzene/graphite displays almost perfect Brownian diffusion and that it can be used as a tool to study dynamic friction. Incoherent neutron backscattering measurements, on the other hand, reveal a jump diffusion behaviour, related to the molecular rotational modes of the benzene rings. Molecular dynamics (MD) simulations have delivered a very detailed picture of the adsorbate dynamics. We use this review to illustrate the open questions and possible future directions of this research field.
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