A simple patchy colloid model for the phase behavior of lysozyme dispersions

Gögelein, C.; Stradner, A.; Nägele, G.; Schurtenberger, P.; Gibaud, T.; Tuinier, R.

doi:10.1063/1.2951987

Journal Article

A simple patchy colloid model for the phase behavior of lysozyme dispersions

Gögelein, C.FZJ* ; Nägele, G.FZJ* ; Tuinier, R.FZJ* ; Gibaud, T. ; Stradner, A. ; Schurtenberger, P.

2008
American Institute of Physics Melville, NY

The journal of chemical physics 129, 085102 (2008) [10.1063/1.2951987]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4643 doi:10.1063/1.2951987

Abstract: We propose a minimal model for spherical proteins with aeolotopic pair interactions to describe the equilibrium phase behavior of lysozyme. The repulsive screened Coulomb interactions between the particles are taken into account assuming that the net charges are smeared out homogeneously over the spherical protein surfaces. We incorporate attractive surface patches, with the interactions between patches on different spheres modeled by an attractive Yukawa potential. The parameters entering the attractive Yukawa potential part are determined using information on the experimentally accessed gas-liquid-like critical point. The Helmholtz free energy of the fluid and solid phases is calculated using second-order thermodynamic perturbation theory. Our predictions for the solubility curve are in fair agreement with experimental data. In addition, we present new experimental data for the gas-liquid coexistence curves at various salt concentrations and compare these with our model calculations. In agreement with earlier findings, we observe that the strength and the range of the attractive potential part only weakly depend on the salt content.

Keyword(s): Algorithms (MeSH) ; Animals (MeSH) ; Biophysics: methods (MeSH) ; Chemistry, Physical: methods (MeSH) ; Chickens (MeSH) ; Colloids: chemistry (MeSH) ; Egg Proteins: chemistry (MeSH) ; Hydrogen-Ion Concentration (MeSH) ; Models, Statistical (MeSH) ; Models, Theoretical (MeSH) ; Muramidase: chemistry (MeSH) ; Solubility (MeSH) ; Solvents: chemistry (MeSH) ; Temperature (MeSH) ; Thermodynamics (MeSH) ; Colloids ; Egg Proteins ; Solvents ; Muramidase ; J

Classification:

Physics, Atomic, Molecular & Chemical

Note: This project has been partly supported by the European Commission under the 6<SUP>th</SUP> Framework Program through integrating and strengthening the European Research Area. Contract No. SoftComp, NoE/NMP3-CT-2004-502235.

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