Dynamical coupling of intrinsically disordered proteins and their hydration water: comparison with folded soluble and membrane proteins

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dc.contributor.authorGallat, FXen_AU
dc.contributor.authorLaganowsky, Aen_AU
dc.contributor.authorWood, Ken_AU
dc.contributor.authorGabel, Fen_AU
dc.contributor.authorvan Eijck, Len_AU
dc.contributor.authorWuttke, Jen_AU
dc.contributor.authorMoulin, Men_AU
dc.contributor.authorHaertlein, Men_AU
dc.contributor.authorEisenberg, Den_AU
dc.contributor.authorColletier, JPen_AU
dc.contributor.authorZaccai, Gen_AU
dc.contributor.authorWeik, Men_AU
dc.date.accessioned2014-04-02T00:46:52Zen_AU
dc.date.available2014-04-02T00:46:52Zen_AU
dc.date.issued2012-07-03en_AU
dc.date.statistics2014-04-02en_AU
dc.descriptionThe author M. Härtlein is generally shown elsewhere as M. Haertlein. The variant spelling has been retained in the citation here.en_AU
dc.description.abstractHydration water is vital for various macromolecular biological activities, such as specific ligand recognition, enzyme activity, response to receptor binding, and energy transduction. Without hydration water, proteins would not fold correctly and would lack the conformational flexibility that animates their three-dimensional structures. Motions in globular, soluble proteins are thought to be governed to a certain extent by hydration-water dynamics, yet it is not known whether this relationship holds true for other protein classes in general and whether, in turn, the structural nature of a protein also influences water motions. Here, we provide insight into the coupling between hydration-water dynamics and atomic motions in intrinsically disordered proteins (IDP), a largely unexplored class of proteins that, in contrast to folded proteins, lack a well-defined three-dimensional structure. We investigated the human IDP tau, which is involved in the pathogenic processes accompanying Alzheimer disease. Combining neutron scattering and protein perdeuteration, we found similar atomic mean-square displacements over a large temperature range for the tau protein and its hydration water, indicating intimate coupling between them. This is in contrast to the behavior of folded proteins of similar molecular weight, such as the globular, soluble maltose-binding protein and the membrane protein bacteriorhodopsin, which display moderate to weak coupling, respectively. The extracted mean square displacements also reveal a greater motional flexibility of IDP compared with globular, folded proteins and more restricted water motions on the IDP surface. The results provide evidence that protein and hydration-water motions mutually affect and shape each other, and that there is a gradient of coupling across different protein classes that may play a functional role in macromolecular activity in a cellular context. © 2012, Cell Press.en_AU
dc.identifier.citationGallat, F. X., Laganowsky, A., Wood, K., Gabel, F., van Eijck, L., Wuttke, J., Moulin, M., Härtlein, M., Eisenberg, D., Colletier, J. P., Zaccai, G., & Weik, M. (2012). Dynamical coupling of intrinsically disordered proteins and their hydration water: comparison with folded soluble and membrane proteins. Biophysical Journal, 103, 129-136. doi:10.1016/j.bpj.2012.05.027en_AU
dc.identifier.govdoc4632en_AU
dc.identifier.issn0006-3495en_AU
dc.identifier.journaltitleBiophysical Journalen_AU
dc.identifier.pagination129-136en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.bpj.2012.05.027en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5378en_AU
dc.identifier.volume103en_AU
dc.language.isoenen_AU
dc.publisherCell Pressen_AU
dc.subjectProteinsen_AU
dc.subjectX-ray lasersen_AU
dc.subjectNeutronsen_AU
dc.subjectProtein structureen_AU
dc.subjectMoleculesen_AU
dc.subjectBacteriaen_AU
dc.titleDynamical coupling of intrinsically disordered proteins and their hydration water: comparison with folded soluble and membrane proteinsen_AU
dc.typeJournal Articleen_AU
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