Investigation on the micro-mechanisms of Al3+ interfering the reactivities of aspartic acid and its biological processes with Mg2+ |
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Authors: | Jian Fen Fan Liang Jun He Jian Liu Min Tang |
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Institution: | (1) College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, People’s Republic of China |
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Abstract: | Density functional theory (DFT) has been applied to study the micro-mechanisms of Al3+ interfering the reactivities of aspartic acid (H2asp) and its biological processes with Mg2+. All the 46 stable conformers of Hasp- and 3 of asp2− have been determined at the B3LYP/6-311++G** level, showing that the 7 most stable conformers of Hasp− all present a very strong and linear O–H···O H-bond between carboxyl and carboxylic acid groups with the bond energy high
up to 162 kJ mol−1. The reaction thermodynamics and micro-mechanism between Al3+ and Hasp− (or asp2−) in aqueous phase have been investigated by the combined application of supramolecular model and polarizable continuum IEFPCM
solvent model, firstly revealing Al3+ interfering in the biological processes of aspartic acid. The substitution thermodynamics and mechanisms of Mg2+ by Al3+ in the biological processes between the species of aspartic acid and Mg2+ in aqueous phase were probed, revealing the facile displacement of Mg2+ by Al3+. These results may provide a reasonable mechanism of Al3+ biological toxicity at the microscopic level. |
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