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@ARTICLE{Stadler:186273,
author = {Stadler, Andreas and Koza, Michael Marek and Fitter, Jörg},
title = {{D}etermination of {C}onformational {E}ntropy of {F}ully
and {P}artially {F}olded {C}onformations of {H}olo- and
{A}pomyoglobin},
journal = {The journal of physical chemistry / B},
volume = {119},
number = {1},
issn = {1520-5207},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2015-00357},
pages = {72 - 82},
year = {2015},
abstract = {Holo- and apomyoglobin can be stabilized in native folded,
partially folded molten globules (MGs) and denatured states
depending on the solvent composition. Although the protein
has been studied as a model system in the field of protein
folding, little is known about the internal dynamics of the
different structural conformations on the picosecond time
scale. In a comparative experimental study we investigated
the correlation between protein folding and dynamics on the
picosecond time scale using incoherent quasielastic neutron
scattering (QENS). The measured mean square displacements
(MSDs) of conformational motions depend significantly on the
secondary structure content of the protein, whereas the
correlation times of the observed internal dynamics were
found to be similar irrespective of the degree of folding.
The conformational entropy difference ΔSconf between the
folded conformations and the acid denatured state could be
determined from the measured MSDs and was compared to the
entropy difference ΔS obtained from thermodynamic
parameters reported in the literature. The observed
difference between ΔS and ΔSconf was attributed to the
entropy difference ΔShydr of dynamically disordered water
molecules of the hydration shell. The entropy content of the
hydration water is significantly larger in the native folded
proteins than in the partially folded MGs. We demonstrate
the potential of incoherent neutron scattering for the
investigation of the role of conformational dynamics in
protein folding.},
cin = {ICS-5 / Neutronenstreuung ; JCNS-1 / ICS-1 / JCNS
(München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II},
ddc = {530},
cid = {I:(DE-Juel1)ICS-5-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
I:(DE-Juel1)ICS-1-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551) /
6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
pid = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
G:(DE-HGF)POF3-6215},
experiment = {EXP:(DE-MLZ)External-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000347753900009},
doi = {10.1021/jp509732q},
url = {https://juser.fz-juelich.de/record/186273},
}