The protein kinase A anchoring protein mAKAP coordinates two integrated cAMP effector pathways

Cyclic adenosine 3′, 5′-monophosphate (cAMP) is a ubiquitous mediator of intracellular signalling events. It acts principally through stimulation of cAMP-dependent protein kinases (PKAs) 1 , 2 but also activates certain ion channels and guanine nucleotide exchange factors (Epacs) 3 . Metabolism of c...

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Veröffentlicht in:Nature (London) 2005-09, Vol.437 (7058), p.574-578
Hauptverfasser: Dodge-Kafka, Kimberly L., Soughayer, Joseph, Pare, Genevieve C., Carlisle Michel, Jennifer J., Langeberg, Lorene K., Kapiloff, Michael S., Scott, John D.
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container_end_page 578
container_issue 7058
container_start_page 574
container_title Nature (London)
container_volume 437
creator Dodge-Kafka, Kimberly L.
Soughayer, Joseph
Pare, Genevieve C.
Carlisle Michel, Jennifer J.
Langeberg, Lorene K.
Kapiloff, Michael S.
Scott, John D.
description Cyclic adenosine 3′, 5′-monophosphate (cAMP) is a ubiquitous mediator of intracellular signalling events. It acts principally through stimulation of cAMP-dependent protein kinases (PKAs) 1 , 2 but also activates certain ion channels and guanine nucleotide exchange factors (Epacs) 3 . Metabolism of cAMP is catalysed by phosphodiesterases (PDEs) 4 , 5 . Here we identify a cAMP-responsive signalling complex maintained by the muscle-specific A-kinase anchoring protein (mAKAP) that includes PKA, PDE4D3 and Epac1. These intermolecular interactions facilitate the dissemination of distinct cAMP signals through each effector protein. Anchored PKA stimulates PDE4D3 to reduce local cAMP concentrations, whereas an mAKAP-associated ERK5 kinase module suppresses PDE4D3. PDE4D3 also functions as an adaptor protein that recruits Epac1, an exchange factor for the small GTPase Rap1, to enable cAMP-dependent attenuation of ERK5. Pharmacological and molecular manipulations of the mAKAP complex show that anchored ERK5 can induce cardiomyocyte hypertrophy. Thus, two coupled cAMP-dependent feedback loops are coordinated within the context of the mAKAP complex, suggesting that local control of cAMP signalling by AKAP proteins is more intricate than previously appreciated.
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subjects 3',5'-Cyclic-AMP Phosphodiesterases - genetics
3',5'-Cyclic-AMP Phosphodiesterases - metabolism
Adapter proteins
Adenosine
Animals
Biological and medical sciences
Cell Line
Cell physiology
Cellular biology
Cyclic AMP - metabolism
Cyclic AMP-Dependent Protein Kinases - metabolism
Cyclic Nucleotide Phosphodiesterases, Type 4
Cytokines - metabolism
Fundamental and applied biological sciences. Psychology
Guanine Nucleotide Exchange Factors - metabolism
Humanities and Social Sciences
Humans
Hypertrophy - chemically induced
letter
Mitogen-Activated Protein Kinase 7 - metabolism
Molecular and cellular biology
Molecular biology
multidisciplinary
Multiprotein Complexes - chemistry
Multiprotein Complexes - genetics
Multiprotein Complexes - metabolism
Myocardium - metabolism
Myocardium - pathology
Rats
Science
Science (multidisciplinary)
Signal Transduction
title The protein kinase A anchoring protein mAKAP coordinates two integrated cAMP effector pathways
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