Abstract
Inhibition of the enzyme acetylcholinesterase (AChE) has been shown to alleviate neurodegenerative diseases prompting several attempts to discover and optimize new AChE inhibitors. In this direction, we explored the pharmacophoric space of 85 AChE inhibitors to identify high quality pharmacophores. Subsequently, we implemented genetic algorithm-based quantitative structure–activity relationship (QSAR) modeling to select optimal combination of pharmacophoric models and 2D physicochemical descriptors capable of explaining bioactivity variation among training compounds (\( {\text{r}}^{ 2}_{ 6 8} = 0. 9 4 \), F-statistic = 125.8, \( {\text{r}}^{ 2}_{\text{LOO}} { = 0} . 9 2 \), \( {\text{r}}^{ 2}_{\text{PRESS}} \) against 17 external test inhibitors = 0.84). Two orthogonal pharmacophores emerged in the QSAR equation suggesting the existence of at least two binding modes accessible to ligands within AChE binding pocket. The successful pharmacophores were comparable with crystallographically resolved AChE binding pocket. We employed the pharmacophoric models and associated QSAR equation to screen the national cancer institute list of compounds. Twenty-four low micromolar AChE inhibitors were identified. The most potent gave IC50 value of 1.0 μM.
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Acknowledgments
This project was sponsored by the Deanship of Scientific Research at the University of Jordan. The authors wish to thank the National Cancer Institute for freely providing hit compounds for experimental validation.
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Abuhamdah, S., Habash, M. & Taha, M.O. Elaborate ligand-based modeling coupled with QSAR analysis and in silico screening reveal new potent acetylcholinesterase inhibitors. J Comput Aided Mol Des 27, 1075–1092 (2013). https://doi.org/10.1007/s10822-013-9699-6
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DOI: https://doi.org/10.1007/s10822-013-9699-6