Halogen-Bonding Interactions of Polybrominated Diphenyl Ethers and Thyroid Hormone Derivatives: A Potential Mechanism for the Inhibition of Iodothyronine Deiodinase

Chemistry : a European Journal
Eric S Marsan, Craig A Bayse


Polybrominated diphenyl ethers (PBDEs) increase flame resistance in consumer goods, but these compounds and their hydroxylated derivatives (OH-BDEs) impair normal thyroid function. Halogen bonding (XB) of PBDEs to an active site selenocysteine may prevent iodothyronine deiodinase(Dio)-catalyzed activation/deactivation of thyroid hormone (TH) derivatives. In this study, we compare the strength of the XB interactions of TH derivatives, iodine-based contrast agents and PBDEs/OH-BDEs with a methylselenolate model of the Dio active site using density functional theory calculations. The strength of the XB interaction depends upon the acceptor halide, the position of the halide, the number of ring substituents, and the proximity of hydroxyl groups to the XB site. The weaker Se⋅⋅⋅Br interactions relative to Se⋅⋅⋅I interactions are consistent with a model of competitive inhibition that blocks binding of THs at elevated PBDE/OH-BDE concentrations. XB interactions were generally more favorable at ortho and meta positions and in substrates with more electron-withdrawing substituents. PBDEs/OH-BDEs that mimic the binding behavior of THs, that is, containing ortho and meta bromides and adjacent hydroxyl groups, may be the most effective inhi...Continue Reading


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