A DFT study of the carboxymethyl-phosphatidylethanolamine formation from glyoxal and phosphatidylethanolamine surface. Comparison with the formation of N(ε)-(carboxymethyl)lysine from glyoxal and L-lysine

Physical Chemistry Chemical Physics : PCCP
Christian Solís-CaleroF Muñoz

Abstract

Mechanisms of the generation of carboxymethyl compounds Nε-(carboxymethyl)lysine (CML) and carboxymethyl-phosphatidylethanolamine (CM-PE) from the reactions between glyoxal and L-lysine, and glyoxal and phosphatidylethanolamine (PE) were studied using the DFT method at the PBE/DNP level of theory. In order to study the reaction with PE, a periodic model of the PE surface was built. The starting surface model includes two molecules of PE, a molecule of monohydrated form of glyoxal, and five water molecules as explicit solvent that form a hydrogen bond network, which are involved in the reactions by stabilizing reaction intermediates and transition states and as proton-transfer carriers, important in all steps of reactions. Both reactions take place in three steps, namely, (1) carbino-diol-amine formation; (2) dehydration; and (3) rearrangement into carboxymethyl final products. The rate-limiting step for the formation of CML/CM-PE was the dehydration stage. The comparison of both reactions in their equivalent stages showed a catalytic role of the PE surface; it is highlighted in the case of dehydration step where its relative free energy barrier had a value of 5.3 kcal mol(-1) lower than that obtained in the L-lysine-glyoxal sys...Continue Reading

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Citations

May 16, 2015·Oxidative Medicine and Cellular Longevity·Christian Solís-CaleroFrancisco Muñoz

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