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Antibodies to the beta 2-adrenergic receptor of frog erythrocytes have been raised in rabbits by immunization with purified receptor preparations. Binding of the antibodies to the receptors was demonstrated by immunoprecipitation and by the altered mobility of the antibody-bound receptors on steric-exclusion HPLC columns. As assessed by a radioimmunoassay developed with the antibody, beta 2-adrenergic receptors from several sources showed various degrees of immunological crossreactivity whereas several beta 1-adrenergic receptors did not crossreact. The antibody appeared to not bind at the ligand binding site of the receptor and did not perturb antagonist radioligand binding to the receptor. Nonetheless, the antibodies selectively attenuated catecholamine-stimulated adenylate cyclase. This suggests that the antibodies recognize and bind to domains of the receptor other than the binding site and that may be involved in coupling to other components of the adenylate cyclase system. Immunocytochemical techniques were used with the antibodies to delineate a postsynaptic localization of beta-adrenergic receptors in rat and frog brain. Thus, these anti-beta-adrenergic receptor antibodies provide a useful reagent for probing beta-adrenergic receptor structure, function, and localization.

proceedings of the national academy of sciences of the united states of america

Antibodies to the beta-adrenergic receptor: attenuation of catecholamine-sensitive adenylate cyclase and demonstration of postsynaptic receptor localization in brain.