Author: Remko, M.; Fitz, D.; Rode, B.M.
Description: Interactions between metal ions and amino acids are common both in solution and in the gas phase. The effect of metal ions and water on the structure of L-histidine is examined. The effect of metal ions (Li+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+ and Zn2+) and water on structures of His.M(H2O)m, m=0.1 complexes have been determined theoretically employing density functional theories using extended basis sets. Of the five stable complexes investigated the relative stability of the gas-phase complexes computed with DFT methods (with one exception of K+ systems) suggest metallic complexes of the neutral L-histidine to be the most stable species. The calculations of monohydrated systems show that even one water molecule has a profound effect on the relative stability of individual complexes. Proton dissociation enthalpies and Gibbs energies of L-histidine in the presence of the metal cations Li+, Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+ and Zn2+ were also computed. Its gas-phase acidity considerably increases upon chelation. Of the Lewis acids investigated, the strongest affinity to L-histidine is exhibited by the Cu2+ cation. The computed Gibbs energies DeltaG are negative, span a rather broad energy interval (from -130 to -1,300 kJ/mol), and upon hydration are appreciably lowered.
Subject headings: Histidine–chemistry; Ions–chemistry; Metals–chemistry; Molecular Conformation; Molecular Dynamics Simulation; Molecular Structure; Stereoisomerism; Thermodynamics; Water–chemistry
Publication year: 2010
Journal or book title: Amino Acids
Volume: 39
Issue: 5
Pages: 1309-1319
Find the full text : https://link.springer.com/article/10.1007%2Fs00726-010-0573-8
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Type: Journal Article
Serial number: 16