John Wiley & Sons, Ltd.

Docking‐based 3D‐QSAR predict binding affinities to aryl hydrocarbon receptor for polychlorinated dibenzodioxins, dibenzofurans and biphenyls

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Polychlorinated Dibenzodioxins (PCDDs), Dibenzofurans (PCDFs) and Biphenyls (PCBs) cause toxic effects after binding to an intracellular cytosolic receptor called the aryl hydrocarbon receptor (AhR). Thymic atrophy, weight loss, immunotoxicity, acute lethality, and induction of cytochrome P4501A1 have all been correlated with the binding affinity to AhR. To study the key molecular features for determining binding affinity to AhR, a homology model of AhR ligand binding domains (LBDs) was developed, and molecular docking approach was employed to obtain docking‐based conformations of all molecules in the whole set, and three dimensional quantitative structure activity relationship (3D‐QSAR) methodology namely Comparative Molecular Field Analysis (CoMFA) was applied. Partial least square (PLS) analysis was performed and QSAR models were generated for a training set of 59 compounds. The generated QSAR model showed good internal and external statistical reliability, and comparison with other reported CoMFA models using different alignment methods, the presented docking‐based CoMFA model showed some advantages. Environ. Toxicol. Chem. © 2013 SETAC

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