Add time:07/13/2019         Source:sciencedirect.com

In our previous paper (Drug Metabolism Parmacokinet 31: 363, 2016), a simulation system for ligand interactions of human CYP1A2 was developed using “Template” composed of hexagonal grids focusing on polyaromatic hydrocarbons (PAHs). The system has been expanded for the application of non-PAH chemicals including medical drugs, industrial chemicals and natural products in the present study. Additions of two Templates C and D around Ring C/E and Ring B, respectively, perpendicular each to Template A, offered the accommodation of non-PAH substrates. The size and shape of Templates C and D were defined from the reciprocal comparison of experimental data of ligands with simulation on Templates. The requirements of occupancies at Trigger region (Ring B) and at region of Facial-side Movement (Ring C) as well as Site of Oxidation were found to be mutual throughout CYP1A2 good substrates tested for over the 450 reactions, irrespective of their shapes and flexibilities. The CYP1A2 Template system was also verified with distinct types of poor substrates (47 chemicals) and inhibitors (37 inhibitors) and found to offer the information on probable structural causes. Present CYP1A2 Template system offers a unified evaluation of human CYP1A2 ligands, which aids for toxicological assessments as well as drug metabolism studies.

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