The FASEB Journal, Vol 3, 1825-1832, Copyright © 1989 by The Federation of American Societies for Experimental Biology

RESEARCH COMMUNICATIONS

Structural basis of beta-adrenergic receptor function

CD Strader, IS Sigal and RA Dixon
Department of Molecular Pharmacology and Biochemistry, Merck Sharp & Dohme Research Laboratories, Rahway, New Jersey 07065.

Receptors that mediate their actions by stimulating guanine nucleotide binding regulatory proteins (G proteins) share structural as well as functional similarities. The structural motif characteristic of receptors of this class includes seven hydrophobic putative transmembrane domains linked by hydrophilic loops. Genetic analysis of the beta-adrenergic receptor (beta AR) revealed that the ligand binding domain of this receptor, like that of rhodopsin, involves residues within the hydrophobic core of the protein. On the basis of these studies, a model for ligand binding to the receptor has been developed in which the amino group of an agonist or antagonist is anchored to the receptor through the carboxylate side chain of Asp113 in the third transmembrane helix. Other interactions between specific residues of the receptor and functional groups on the ligand have also been proposed. The interaction between the beta AR and the G protein Gs has been shown to involve an intracellular region that is postulated to form an amphiphilic alpha helix. This region of the beta AR is also critical for sequestration, which accompanies agonist-mediated desensitization, to occur. Structural similarities among G protein- linked receptors suggest that the information gained from the genetic analysis of the beta AR should help define functionally important regions of other receptors of this class.

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