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. 1996 Mar 5;93(5):2105–2109. doi: 10.1073/pnas.93.5.2105

Protein kinase cross-talk: membrane targeting of the beta-adrenergic receptor kinase by protein kinase C.

R Winstel 1, S Freund 1, C Krasel 1, E Hoppe 1, M J Lohse 1
PMCID: PMC39917  PMID: 8700892

Abstract

The beta-adrenergic receptor kinase (betaARK) is the prototypical member of the family of cytosolic kinases that phosphorylate guanine nucleotide binding-protein-coupled receptors and thereby trigger uncoupling between receptors and guanine nucleotide binding proteins. Herein we show that this kinase is subject to phosphorylation and regulation by protein kinase C (PKC). In cell lines stably expressing alpha1B- adrenergic receptors, activation of these receptors by epinephrine resulted in an activation of cytosolic betaARK. Similar data were obtained in 293 cells transiently coexpressing alpha1B- adrenergic receptors and betaARK-1. Direct activation of PKC with phorbol esters in these cells caused not only an activation of cytosolic betaARK-1 but also a translocation of betaARK immunoreactivity from the cytosol to the membrane fraction. A PKC preparation purified from rat brain phospborylated purified recombinant betaARK-1 to a stoichiometry of 0.86 phosphate per betaARK-1. This phosphorylation resulted in an increased activity of betaARK-1 when membrane-bound rhodopsin served as its substrate but in no increase of its activity toward a soluble peptide substrate. The site of phosphorylation was mapped to the C terminus of betaARK-1. We conclude that PKC activates betaARK by enhancing its translocation to the plasma membrane.

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