We provide a quantitative description of the solvation properties of lysozyme in water/ethanol mixtures, which has been obtained by a simultaneous analysis of small-angle neutron scattering and differential scanning calorimetry experiments. All data sets were analyzed by an original method, which integrates the exchange equilibrium model between water and ethanol molecules at the protein surface and activity coefficients data of water/ethanol binary mixtures. As a result, the preferential binding of ethanol molecules at the protein surface was obtained for both native and thermal unfolded protein states. Excess solvation numbers reveal a critical point at ethanol molar fraction ≈0.06, corresponding to the triggering of the hydrophobic clustering of alcohol molecules detected in water/ethanol binary mixtures.
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28 December 2011
Research Article|
December 23 2011
Preferential solvation of lysozyme in water/ethanol mixtures
Maria Grazia Ortore;
Maria Grazia Ortore
1Department of Life and Environment Sciences,
Marche Polytechnic University and CNISM
, I-60131 Ancona, Italy
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Paolo Mariani;
Paolo Mariani
1Department of Life and Environment Sciences,
Marche Polytechnic University and CNISM
, I-60131 Ancona, Italy
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Flavio Carsughi;
Flavio Carsughi
2Department of Agricultural Food and Environmental Sciences,
Marche Polytechnic University and CNISM
, I-60131 Ancona, Italy
3Jülich Center for Neutron Scattering,
Forschungszentrum Jülich
, D-85747 Garching, Germany
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Stefania Cinelli;
Stefania Cinelli
4Department of Physics,
University of Perugia and CEMIN
, I-06123 Perugia, Italy
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Giuseppe Onori;
Giuseppe Onori
4Department of Physics,
University of Perugia and CEMIN
, I-06123 Perugia, Italy
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José Teixeira;
José Teixeira
5
Laboratoire Léon-Brillouin
, F-91191 Gif-sur-Yvette, France
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Francesco Spinozzi
Francesco Spinozzi
a)
1Department of Life and Environment Sciences,
Marche Polytechnic University and CNISM
, I-60131 Ancona, Italy
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a)
Author to whom correspondence should be addressed. Electronic mail: f.spinozzi@univpm.it.
J. Chem. Phys. 135, 245103 (2011)
Article history
Received:
June 30 2011
Accepted:
November 29 2011
Citation
Maria Grazia Ortore, Paolo Mariani, Flavio Carsughi, Stefania Cinelli, Giuseppe Onori, José Teixeira, Francesco Spinozzi; Preferential solvation of lysozyme in water/ethanol mixtures. J. Chem. Phys. 28 December 2011; 135 (24): 245103. https://doi.org/10.1063/1.3670419
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