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@ARTICLE{Katava:827265,
author = {Katava, Marina and Maccarini, Marco and Villain, Guillaume
and Paciaroni, Alessandro and Sztucki, Michael and Ivanova,
Oxana and Madern, Dominique and Sterpone, Fabio},
title = {{T}hermal activation of ‘allosteric-like’ large-scale
motions in a eukaryotic {L}actate {D}ehydrogenase},
journal = {Scientific reports},
volume = {7},
issn = {2045-2322},
address = {London},
publisher = {Nature Publishing Group},
reportid = {FZJ-2017-01459},
pages = {41092 -},
year = {2017},
abstract = {Conformational changes occurring during the enzymatic
turnover are essential for the regulation of protein
functionality. Individuating the protein regions involved in
these changes and the associated mechanical modes is still a
challenge at both experimental and theoretical levels. We
present here a detailed investigation of the thermal
activation of the functional modes and conformational
changes in a eukaryotic Lactate Dehydrogenase enzyme (LDH).
Neutron Spin Echo spectroscopy and Molecular Dynamics
simulations were used to uncover the characteristic length-
and timescales of the LDH nanoscale motions in the apo
state. The modes involving the catalytic loop and the mobile
region around the binding site are activated at room
temperature, and match the allosteric reorganisation of
bacterial LDHs. In a temperature window of about
15 degrees, these modes render the protein flexible enough
and capable of reorganising the active site toward reactive
configurations. On the other hand an excess of thermal
excitation leads to the distortion of the protein matrix
with a possible anti-catalytic effect. Thus, the temperature
activates eukaryotic LDHs via the same conformational
changes observed in the allosteric bacterial LDHs. Our
investigation provides an extended molecular picture of
eukaryotic LDH’s conformational landscape that enriches
the static view based on crystallographic studies alone.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {000},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)J-NSE-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000392465800001},
doi = {10.1038/srep41092},
url = {https://juser.fz-juelich.de/record/827265},
}