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000187418 1001_ $$0P:(DE-HGF)0$$aGrimaldo, Marco$$b0$$eCorresponding Author
000187418 245__ $$aHierarchical molecular dynamics of bovine serum albumin in concentrated aqueous solution below and above thermal denaturation
000187418 260__ $$aCambridge$$bRSC Publ.$$c2015
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000187418 520__ $$aThe dynamics of proteins in solution is a complex and hierarchical process, affected by the aqueous environment as well as temperature. We present a comprehensive study on nanosecond time and nanometer length scales below, at, and above the denaturation temperature Td. Our experimental data evidence dynamical processes in protein solutions on three distinct time scales. We suggest a consistent physical picture of hierarchical protein dynamics: (i) self-diffusion of the entire protein molecule is confirmed to agree with colloid theory for all temperatures where the protein is in its native conformational state. At higher temperatures T > Td, the self-diffusion is strongly obstructed by cross-linking or entanglement. (ii) The amplitude of backbone fluctuations grows with increasing T, and a transition in its dynamics is observed above Td. (iii) The number of mobile side-chains increases sharply at Td while their average dynamics exhibits only little variations. The combination of quasi-elastic neutron scattering and the presented analytical framework provides a detailed microscopic picture of the protein molecular dynamics in solution, thereby reflecting the changes of macroscopic properties such as cluster formation and gelation.
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000187418 7001_ $$0P:(DE-HGF)0$$aRoosen-Runge, Felix$$b1
000187418 7001_ $$0P:(DE-HGF)0$$aHennig, Marcus$$b2
000187418 7001_ $$0P:(DE-HGF)0$$aZanini, Fabio$$b3
000187418 7001_ $$0P:(DE-HGF)0$$aZhang, Fajun$$b4
000187418 7001_ $$0P:(DE-Juel1)143752$$aJalarvo, Niina$$b5$$ufzj
000187418 7001_ $$0P:(DE-Juel1)131056$$aZamponi, Michaela$$b6$$ufzj
000187418 7001_ $$0P:(DE-HGF)0$$aSchreiber, Frank$$b7
000187418 7001_ $$0P:(DE-HGF)0$$aSeydel, Tilo$$b8
000187418 773__ $$0PERI:(DE-600)1476244-4$$a10.1039/C4CP04944F$$gVol. 17, no. 6, p. 4645 - 4655$$n6$$p4645 - 4655$$tPhysical chemistry, chemical physics$$v17$$x1463-9084$$y2015
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