β-Adrenergic receptor kinase. Activity of partial agonists for stimulation of adenylate cyclase correlates with ability to promote receptor phosphorylation
The β-adrenergic receptor (βAR) kinase is a recently discovered enzyme which specifically phosphorylates the agonist-occupied form of the β-adrenergic receptor. We have utilized the agonist-dependent nature of this phosphorylation reaction to characterize the ability of partial agonists to interact with the receptor. Partial agonists were tested for their ability to: 1) stimulate adenylate cyclase activity in a three-component reconstituted system, and 2) promote phosphorylation of βAR by βAR kinase. There is an excellent correlation between the ability of partial agonists to stimulate adenylate cyclase activity and promote receptor phosphorylation by βAR kinase (y = 1.02x - 0.01, r = 0.996, p < 0.001). Peptide maps of receptor phosphorylated by βAR kinase in the presence of full or partial agonists are virtually identical with the partial agonist pattern reduced in intensity. Moreover, kinetic studies of βAR phosphorylation by βAR kinase suggest that partial agonists alter the V(max) of the reaction with little, if any, effect on the K(m). These results suggest that at steady state partial agonists transform a smaller portion of the receptor pool into the conformationally altered or activated form which serves as the substrate for βAR kinase, although they do not completely rule out the possibility that a partial conformational change is occurring.
Benovic, JL; Staniszewski, C; Mayor, F; Caron, MG; Lefkowitz, RJ
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