Citation: WANG Ying, YI Hai-Bo, LI Hui-Ji, DAI Qian, CAO Zhi-Wei, LU Yang. Effects of Interactions between Ions and Alanine Polar Groups on Alanine Associations in Saline Solution: Density Functional Theory and Molecular Dynamics Simulation[J]. Acta Physico-Chimica Sinica, ;2015, 31(6): 1035-1044. doi: 10.3866/PKU.WHXB201504031 shu

Effects of Interactions between Ions and Alanine Polar Groups on Alanine Associations in Saline Solution: Density Functional Theory and Molecular Dynamics Simulation

1.
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China

Received Date: 22 January 2015
Available Online: 3 April 2015
Fund Project: 国家自然科学基金(21073056, J1210040)与湖南省&ldquo (21073056, J1210040)项目(2012)资助 (2012)

Density functional theory (DFT) and classical molecular dynamics simulations were used to study the effects of the interactions between zwitterionic alanine and some ions (Na⁺, Cu²⁺, Zn²⁺, and Cl^-) in saline solution on the association of alanine molecules. The DFT calculation results show that the association of alanine with these ions can enhance charge separation of zwitterionic alanine. Classical molecular dynamics simulation results also show that three associated structures of zwitterionic alanine molecules are present in alanine aqueous solution, and the associations can be weakened to a certain extent by the interactions between the cations/anions and alanine polar groups. The interaction between a cation and the carboxyl group of alanine can be greatly affected by hydration of the cation in dilute saline solution. The interaction between Cu²⁺ and alanine is much stronger than that between Na⁺ and alanine in the gas phase, but the situation is reversed in dilute aqueous solution, because the hydration of Cu²⁺ is much stronger than that of Na⁺. In dilute ZnCl₂ aqueous solution, the interaction between Zn²⁺ and the carboxyl group of the alanine molecule is less direct, because of the first hydration shell of Zn²⁺. However, indirect interactions between Zn²⁺ and alanine still lead to a decreased association among alanine molecules. In addition, the interactions of cations/anions with alanine not only weaken the association between alanine molecules, but also result in transformation between two typical conformations of associated alanine molecules. The ion concentration affects the conformations of associated cation/anion-alanine species, and associated alanine molecules.
- Zwitterion,
- Cation,
- Hydration,
- Association,
- Intermolecular interaction
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