Journal
JOURNAL OF CELL BIOLOGY
Volume 189, Issue 3, Pages 573-587Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200911047
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Funding
- National Institutes of Health [HL56687, HL-75443]
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Ca2+/calmodulin kinase II (CaMKII) plays an important role in cardiac contractility and the development of heart failure. Although stimulation of beta(1)-adrenergic receptors (ARs) leads to an increase in CaMKII activity, the molecular mechanism by which beta(1)-ARs activate CaMKII is not completely understood. In this study, we show the requirement for the beta(1)-AR regulatory protein beta-arrestin as a scaffold for both CaMKII and Epac (exchange protein directly activated by cAMP). Stimulation of beta(1)-ARs induces the formation of a beta-arrestin-CaMKII-Epac1 complex, allowing its recruitment to the plasma membrane, whereby interaction with cAMP leads to CaMKII activation. beta-Arrestin binding to the carboxyl-terminal tail of beta(1)-ARs promotes a conformational change within beta-arrestin that allows CaMKII and Epac to remain in a stable complex with the receptor. The essential role for beta-arrestin and identification of the molecular mechanism by which only beta(1)-ARs and not beta(2)-ARs activate CaMKII significantly advances our understanding of this important cellular pathway.
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