Thermophoresis: The Case of Streptavidin and Biotin

Thermophoretic behavior of a free protein changes upon ligand binding and gives access to information on the binding constants. The Soret effect has also been proven to be a promising tool to gain information on the hydration layer, as the temperature dependence of the thermodiffusion behavior is se...

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Published inPolymers Vol. 12; no. 2; p. 376
Main Authors Niether, Doreen, Sarter, Mona, Koenig, Bernd W, Fitter, Jörg, Stadler, Andreas M, Wiegand, Simone
Format Journal Article
LanguageEnglish
Published Switzerland MDPI 07.02.2020
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Abstract Thermophoretic behavior of a free protein changes upon ligand binding and gives access to information on the binding constants. The Soret effect has also been proven to be a promising tool to gain information on the hydration layer, as the temperature dependence of the thermodiffusion behavior is sensitive to solute-solvent interactions. In this work, we perform systematic thermophoretic measurements of the protein streptavidin (STV) and of the complex STV with biotin (B) using thermal diffusion forced Rayleigh scattering (TDFRS). Our experiments show that the temperature sensitivity of the Soret coefficient is reduced for the complex compared to the free protein. We discuss our data in comparison with recent quasi-elastic neutron scattering (QENS) measurements. As the QENS measurement has been performed in heavy water, we perform additional measurements in water/heavy water mixtures. Finally, we also elucidate the challenges arising from the quantiative thermophoretic study of complex multicomponent systems such as protein solutions.
AbstractList Thermophoretic behavior of a free protein changes upon ligand binding and gives access to information on the binding constants. The Soret effect has also been proven to be a promising tool to gain information on the hydration layer, as the temperature dependence of the thermodiffusion behavior is sensitive to solute−solvent interactions. In this work, we perform systematic thermophoretic measurements of the protein streptavidin (STV) and of the complex STV with biotin (B) using thermal diffusion forced Rayleigh scattering (TDFRS). Our experiments show that the temperature sensitivity of the Soret coefficient is reduced for the complex compared to the free protein. We discuss our data in comparison with recent quasi-elastic neutron scattering (QENS) measurements. As the QENS measurement has been performed in heavy water, we perform additional measurements in water/heavy water mixtures. Finally, we also elucidate the challenges arising from the quantiative thermophoretic study of complex multicomponent systems such as protein solutions.
Thermophoretic behavior of a free protein changes upon ligand binding and gives access to information on the binding constants. The Soret effect has also been proven to be a promising tool to gain information on the hydration layer, as the temperature dependence of the thermodiffusion behavior is sensitive to solute–solvent interactions. In this work, we perform systematic thermophoretic measurements of the protein streptavidin (STV) and of the complex STV with biotin (B) using thermal diffusion forced Rayleigh scattering (TDFRS). Our experiments show that the temperature sensitivity of the Soret coefficient is reduced for the complex compared to the free protein. We discuss our data in comparison with recent quasi-elastic neutron scattering (QENS) measurements. As the QENS measurement has been performed in heavy water, we perform additional measurements in water/heavy water mixtures. Finally, we also elucidate the challenges arising from the quantiative thermophoretic study of complex multicomponent systems such as protein solutions.
Author Stadler, Andreas M
Fitter, Jörg
Niether, Doreen
Wiegand, Simone
Sarter, Mona
Koenig, Bernd W
AuthorAffiliation 6 Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52056 Aachen, Germany
2 I. Physikalisches Institut (IA) & JARA-SOFT, AG Biophysik, RWTH Aachen, Sommerfeldstrasse 14, 52074 Aachen, Germany; mona.sarter@stfc.ac.uk (M.S.); fitter@physik.rwth-aachen.de (J.F.)
7 Department für Chemie—Physikalische Chemie, Universität zu Köln, 50939 Cologne, Germany
3 Jülich Centre for Neutron Science (JCNS-1) and Institute of Biological Information Processing (IBI-8: Neutron Scattering and Soft Matter), Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany; a.stadler@fz-juelich.de
4 Institute of Biological Information Processing (IBI-7: Structural Biochemistry), Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany; b.koenig@fz-juelich.de
1 Institute of Biological Information Processing (IBI-4: Biomacromolecular Systems and Processes) & JARA-SOFT, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany
5 Institute of Biological Information Processing (IBI-6: Molecular Biophysics), Fors
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Issue 2
Keywords hydrogen bonds
thermophoresis
protein–ligand binding
Language English
License Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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Current address: IEK-8, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany.
Current address: ISIS Pulsed Neutron and Muon Facility, Science and Technology FacilitiesCouncil Rutherford Appleton Laboratory, Harwell Science and InnovationCampus, Oxon OX11 0QX, UK.
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Snippet Thermophoretic behavior of a free protein changes upon ligand binding and gives access to information on the binding constants. The Soret effect has also been...
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SubjectTerms hydrogen bonds
protein–ligand binding
thermophoresis
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Title Thermophoresis: The Case of Streptavidin and Biotin
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