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Molecular Pharmacology

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Abstract

Identification of a single amino acid residue responsible for the binding of a class of beta-adrenergic receptor antagonists to 5-hydroxytryptamine1A receptors.

X M Guan, S J Peroutka and B K Kobilka
Molecular Pharmacology April 1992, 41 (4) 695-698;
X M Guan
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S J Peroutka
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B K Kobilka
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Abstract

The 5-hydroxytryptamine1A (5-HT1A) receptor can bind certain beta-adrenergic receptor antagonists, such as pindolol, with high affinity. Such pharmacological cross-reactivity suggests a structural similarity in the ligand binding site between the two receptors. To identify this structural entity, we mutated Asn385 in the seventh transmembrane domain of the human 5-HT1A receptor, based on the observation that this residue is conserved in all 5-HT1A and beta-adrenergic receptors of different species but is absent in all other cloned guanine nucleotide-binding protein-coupled receptors. This single point mutation (Asn385 to valine) causes a highly selective decrease in the affinity of pindolol and other aryloxyalkylamines for the mutant receptor (about 100-fold), while producing only minor changes in the binding of other 5-HT agonists and antagonists. The results provide direct evidence that Asn385 is responsible for the high affinity interaction between 5-HT1A receptors and aryloxyalkylamine beta-adrenergic antagonists but is not required for the binding of other chemical classes of ligands.

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Molecular Pharmacology
Vol. 41, Issue 4
1 Apr 1992
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Abstract

Identification of a single amino acid residue responsible for the binding of a class of beta-adrenergic receptor antagonists to 5-hydroxytryptamine1A receptors.

X M Guan, S J Peroutka and B K Kobilka
Molecular Pharmacology April 1, 1992, 41 (4) 695-698;

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Abstract

Identification of a single amino acid residue responsible for the binding of a class of beta-adrenergic receptor antagonists to 5-hydroxytryptamine1A receptors.

X M Guan, S J Peroutka and B K Kobilka
Molecular Pharmacology April 1, 1992, 41 (4) 695-698;
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