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Structural Analysis of the Histamine H1 Receptor

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Histamine and Histamine Receptors in Health and Disease

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 241))

Abstract

The crystal structure of the human histamine H1 receptor (H1R) has been determined in complex with its inverse agonist doxepin, a first-generation antihistamine. The crystal structure showed that doxepin sits deeply inside the ligand-binding pocket and predominantly interacts with residues highly conserved among other aminergic receptors. This binding mode is considered to result in the low selectivity of the first-generation antihistamines for H1R. The crystal structure also revealed the mechanism of receptor inactivation by the inverse agonist doxepin. On the other hand, the crystal structure elucidated the anion-binding site near the extracellular portion of the receptor. This site consists of residues not conserved among other aminergic receptors, which are specific for H1R. Docking simulation and biochemical experimentation demonstrated that a carboxyl group on the second-generation antihistamines interacts with the anion-binding site. These results imply that the anion-binding site is a key site for the development of highly selective antihistamine drugs.

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Acknowledgments

This work was supported by the ERATO IWATA Human Receptor Crystallography Project from the Japan Science and Technology Agency, the Targeted Proteins Research Program of MEXT, the Mochida Memorial Foundation for Medical and Pharmaceutical Research (T. K.), Takeda Scientific Foundation (M. S. and T. K.), and the Sumitomo Foundation (T. K.).

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Correspondence to Mitsunori Shiroishi .

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© 2016 SpringerInternationalPublishingSwitzerland

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Shiroishi, M., Kobayashi, T. (2016). Structural Analysis of the Histamine H1 Receptor. In: Hattori, Y., Seifert, R. (eds) Histamine and Histamine Receptors in Health and Disease. Handbook of Experimental Pharmacology, vol 241. Springer, Cham. https://doi.org/10.1007/164_2016_10

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