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Molecular Pharmacology

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Research ArticleArticle

Agonist-Specific Alterations in Receptor Binding Affinity Associated with Solubilization of Turkey Erythrocyte Membrane Beta Adrenergic Receptors

LINDA JOY PIKE and ROBERT J. LEFKOWITZ
Molecular Pharmacology March 1978, 14 (2) 370-375;
LINDA JOY PIKE
Departments of Medicine and Biochemistry, Duke University Medical Center, Durham, North Carolina 27710
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ROBERT J. LEFKOWITZ
Departments of Medicine and Biochemistry, Duke University Medical Center, Durham, North Carolina 27710
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Abstract

The beta adrenengic receptor binding sites of turkey erythrocyte membranes, identified by (-)-[3H]dihydroalprenolol binding, were solubilized with digitonin. The binding sites in particulate and soluble preparations displayed appropriate characteristics of beta1 adrenergic specificity, stereospecificity, high affinity and saturability. The affinity of all agonists tested was significantly (2-50-fold) greater in the soluble than in the particulate preparations. The affinities of antagonists, however, were identical in the soluble and particulate preparations. Agonist-specific alterations in receptor binding affinity were also found to be mediated by assay temperature. Thus agonist but not antagonist affinities increased as the temperature was lowered from 37° to 4°. Possible molecular mechanisms responsible for the observed shifts are discussed.

ACKNOWLEDGMENT The authors thank Dr. Lee E. Limbird for many helpful discussions.

  • Copyright © 1978 by Academic Press, Inc.

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Molecular Pharmacology
Vol. 14, Issue 2
1 Mar 1978
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Research ArticleArticle

Agonist-Specific Alterations in Receptor Binding Affinity Associated with Solubilization of Turkey Erythrocyte Membrane Beta Adrenergic Receptors

LINDA JOY PIKE and ROBERT J. LEFKOWITZ
Molecular Pharmacology March 1, 1978, 14 (2) 370-375;

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Research ArticleArticle

Agonist-Specific Alterations in Receptor Binding Affinity Associated with Solubilization of Turkey Erythrocyte Membrane Beta Adrenergic Receptors

LINDA JOY PIKE and ROBERT J. LEFKOWITZ
Molecular Pharmacology March 1, 1978, 14 (2) 370-375;
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