Table of Contents
Journal of Theoretical Chemistry
Volume 2013 (2013), Article ID 768185, 13 pages
http://dx.doi.org/10.1155/2013/768185
Research Article

Scale Alpha and Beta of Quantitative Convergence and Chemical Reactivity Analysis in Dual Cholinesterase/Monoamine Oxidase Inhibitors for the Alzheimer Disease Treatment Using Density Functional Theory (DFT)

1Grupo de Química Cuántica y Teórica, Universidad de Cartagena, Programa de Química, Facultad de Ciencias Exactas y Naturales, 130015 Cartagena de Indias, Colombia
2Departamento de Ciencias Químicas, Universidad Nacional Andres Bello, República 275, 8370146 Santiago, Chile
3Corporación Universitaria Rafael Núñez, Facultad de Medicina, Cartagena, Colombia

Received 13 March 2013; Accepted 27 September 2013

Academic Editors: G. Borosky, Q. Ge, M. Koyama, A. M. Lamsabhi, N. Russo, and D. Sajan

Copyright © 2013 Alejandro Morales-Bayuelo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Molecular quantum similarity descriptors and Density Functional Theory (DFT) based reactivity descriptors were studied for a series of cholinesterase/monoamine oxidase inhibitors used for the Alzheimer's disease treatment (AD). This theoretical study is expected to shed some light onto some molecular aspects that could contribute to the knowledge of the molecular mechanics behind interactions of these molecules with acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE), as well as with monoamine oxidase (MAO) A and B. The Topogeometrical Superposition Algorithm to handle flexible molecules (TGSA-Flex) alignment method was used to solve the problem of the relative orientation in the quantum similarity (QS) field. Using the molecular quantum similarity (MQS) field and reactivity descriptors supported in the DFT was possible the quantification of the steric and electrostatic effects through of the Coulomb and Overlap quantitative convergence scales (alpha and beta). In addition, an analysis of reactivity indexes is development, using global and local descriptors, identifying the binding sites and selectivity in the (cholinesterase/monoamine oxidase) inhibitors, understanding the retrodonor process, and showing new insight for drugs design in a disease of difficult control as Alzheimer.