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Biochem Biophys Res Commun. 1994 May 30;201(1):295-301.

Site-directed mutagenesis of the histamine H1-receptor reveals a selective interaction of asparagine207 with subclasses of H1-receptor agonists.

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Leiden/Amsterdam Center for Drug Research, Department of Pharmacochemistry, The Netherlands.


In this study we investigated the role of the threonine203 and the asparagine207 residues in the fifth transmembrane domain of the guinea-pig histamine H1-receptor by site-directed mutagenesis to non-functional alanines. Whereas the threonine203 residue is not important for the action of histamine, the asparagine207 residue appears to be involved in the binding of the N tau-nitrogen atom of histamine and its 2-methyl-analogue. For the 2-phenyl-analogue and non-imidazole H1-receptor agonists, this residue is, however, not essential for binding. On the basis of this study we conclude that different histamine H1-receptor agonists interact in different ways with the H1-receptor protein. Moreover, we speculate that the interaction with the N pi-nitrogen atom is essential for H1-receptor activation.

[Indexed for MEDLINE]

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