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Prediction of thermodynamic instabilities of protein solutions from simple protein-protein interactions

Abstract: Statistical thermodynamics of protein solutions is often studied in terms of simple, microscopic models of particles interacting via pairwise potentials. Such modelling can reproduce the short range structure of protein solutions at equilibrium and predict thermodynamics instabilities of these systems. We introduce a square well model of effective protein?protein interaction that embeds the solvent?s action. We modify an existing model [45] by considering a well depth having an explicit dependence on temperature, i.e. an explicit free energy character, thus encompassing the statistically relevant configurations of solvent molecules around proteins. We choose protein solutions exhibiting demixing upon temperature decrease (lysozyme, enthalpy driven) and upon temperature increase (haemoglobin, entropy driven). We obtain satisfactory fits of spinodal curves for both the two proteins without adding any mean field term, thus extending the validity of the original model. Our results underline the solvent role in modulating or stretching the interaction potential.

 Autoría: D'Agostino T., Solana J., Emanuele A.,

 Fuente: Chemical Physics, 2013, 424, 50-55

 Editorial: Elsevier

 Fecha de publicación: 16/10/2013

 Nº de páginas: 6

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.chemphys.2013.01.041

 ISSN: 0301-0104,1873-4421

 Proyecto español: FIS2009-09616

 Url de la publicación: http://dx.doi.org/10.1016/j.chemphys.2013.01.041