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Journal of Solution Chemistry

, Volume 40, Issue 7, pp 1317–1340 | Cite as

A Computer Simulation of the Electronic Structure of Leucine in Aqueous Solution

  • X. Wang
  • H. Zheng
Article

Abstract

In order to obtain the electronic structure of leucine (Leu) in aqueous solution, we studied three systems: Leu+7H2O, Leu+8H2O and Leu+9H2O. The results indicated that the system Leu+8H2O was the only choice which was both acceptable and doable: its computational effort was affordable, and it could simulate a main part of the solvent effect on the electronic structure of Leu in solution. Based on the system Leu+8H2O, all-electron, ab initio calculations were performed to construct an equivalent potential of water for the electronic structure of Leu with dipoles. The results showed that the main effect of water on the electronic structure of Leu was raising the occupied states about 0.0824 Ry on average, and broadening the energy gap by 11%. The water effect on the electronic structure of Leu could be well simulated by the dipole potential. The obtained equivalent potential can be applied directly to the electronic structure calculation of proteins in solution.

Keywords

Leucine Electronic structure Water Free cluster calculation Self-consistent cluster-embedding calculation 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Physics DepartmentTongji UniversityShanghaiChina
  2. 2.Shanghai Key Laboratory of Special Artificial Microstructure Materials and TechnologyShanghaiChina

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