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Coherent X-ray Scattering Reveals Nanoscale Fluctuations in Hydrated Proteins

Bin, Maddalena (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Reiser, Mario (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Filianina, Mariia (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
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Berkowicz, Sharon (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Das, Sudipta (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Timmermann, Sonja (författare)
Department Physik, Universität Siegen, Walter-Flex-Strasse 3, 57072 Siegen, Germany
Roseker, Wojciech (författare)
Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
Bauer, Robert (författare)
Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany;Freiberg Water Research Center, Technische Universität Bergakademie Freiberg, 09599 Freiberg, Germany
Öström, Jonatan (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Karina, Aigerim (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Amann-Winkel, Katrin (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden;Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;Institute of Physics, Johannes Gutenberg University, 55128 Mainz, Germany
Ladd-Parada, Marjorie (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
Westermeier, Fabian (författare)
Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
Sprung, Michael (författare)
Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
Möller, Johannes (författare)
European X-Ray Free-Electron Laser Facility, Holzkoppel 4, 22869 Schenefeld, Germany
Lehmkühler, Felix (författare)
Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany;The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
Gutt, Christian (författare)
Department Physik, Universität Siegen, Walter-Flex-Strasse 3, 57072 Siegen, Germany
Perakis, Fivos (författare)
Department of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
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 (creator_code:org_t)
American Chemical Society (ACS), 2023
2023
Engelska.
Ingår i: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1520-6106 .- 1520-5207. ; 127:21, s. 4922-4930
Relaterad länk:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Hydrated proteins undergo a transition in the deeply supercooled regime, which is attributed to rapid changes in hydration water and protein structural dynamics. Here, we investigate the nanoscale stress-relaxation in hydrated lysozyme proteins stimulated and probed by X-ray Photon Correlation Spectroscopy (XPCS). This approach allows us to access the nanoscale dynamics in the deeply supercooled regime (T = 180 K), which is typically not accessible through equilibrium methods. The observed stimulated dynamic response is attributed to collective stress-relaxation as the system transitions from a jammed granular state to an elastically driven regime. The relaxation time constants exhibit Arrhenius temperature dependence upon cooling with a minimum in the Kohlrausch-Williams-Watts exponent at T = 227 K. The observed minimum is attributed to an increase in dynamical heterogeneity, which coincides with enhanced fluctuations observed in the two-time correlation functions and a maximum in the dynamic susceptibility quantified by the normalized variance χT. The amplification of fluctuations is consistent with previous studies of hydrated proteins, which indicate the key role of density and enthalpy fluctuations in hydration water. Our study provides new insights into X-ray stimulated stress-relaxation and the underlying mechanisms behind spatiotemporal fluctuations in biological granular materials.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

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