Hydration water in dynamics of a hydrated beta-lactoglobulin
Laboratoire Léon Brillouin (CNRS-CEA), CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
2 Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, 814-0180, Fukuoka, Japan
Incoherent spin-echo signals of a hydrated β-lactoglobulin protein were investigated, at 275 and 293 K. The intermediate scattering functions I(Q,t) were divided in two contributions from surface water and protein, respectively. On one hand, the dynamics of the surface water follows a KWW stretched exponential function (the exponent is ~0.5), on the other hand, that of the protein follows a single exponential. The present results are consistent with our previous results of hydrated C-phycocyanin combining elastic and quasielastic neutron scattering and by molecular dynamics simulation.
© EDP Sciences, Springer-Verlag, 2007