title: Electrostatic Protein-Protein Interactions: Comparison of Point-Dipole and Finite-Length Dipole Potentials of Mean Force.
abstract: Based on summation of Coulombic interactions, a model is developed for finite-length dipole potentials of mean force in a salt-free dielectric continuum. Point-dipole and finite-length dipole potentials of mean force are compared for protein-protein interactions using parameters for bovine alpha-chymotrypsin. The two approximations made in the commonly used analytical point-dipole potentials of mean force are not valid at distances near contact. Relative to the finite-length dipole model, the high-temperature approximation overpredicts, and the point-dipole approximation underpredicts charge-dipole and dipole-dipole attractions.
authors.affiliation: Department of Chemical Engineering, University of California, Berkeley, California, 94720
authors.initials: CJ
authors.lastname: Coen
authors.initials: J
authors.lastname: Newman
authors.initials: HW
authors.lastname: Blanch
authors.initials: JM
authors.lastname: Prausnitz