%0 Conference Paper
%A Niether, Doreen
%A Sarter, Mona
%A König, Bernd
%A Fitter, Jörg
%A Stadler, Andreas
%A Wiegand, Simone
%T Thermophoresis: The Case of Streptavidin and Biotin
%M FZJ-2020-05213
%D 2020
%X 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 [1]. 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) [2]. 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. References[1] “Thermophoresis of biological and biocompatible compounds in aqueous solution”; Niether, D; Wiegand, S.; J. Phys. Condens. Matter, 31, 503003, (2019). DOI: 10.1088/1361-648X/ab421c[2] “Thermophoresis: The Case of Streptavidin and Biotin”; Niether, D; Sarter, M; Koenig, B.W. et al; Polymers, 12, 376, (2020). DOI: 10.3390/polym12020376.
%B 2020 EUSMI User Meeting
%C 19 Nov 2020 - 19 Nov 2020, virtual conference (Germany)
Y2 19 Nov 2020 - 19 Nov 2020
M2 virtual conference, Germany
%F PUB:(DE-HGF)6
%9 Conference Presentation
%U https://juser.fz-juelich.de/record/888784