"Shaping" of cell signaling via AKAP-tethered PDE4D: Probing with AKAR2-AKAP5 biosensor.
J Mol Signal
; 7(1): 4, 2012 May 14.
Article
en En
| MEDLINE
| ID: mdl-22583680
ABSTRACT
BACKGROUND:
PKA, a key regulator of cell signaling, phosphorylates a diverse and important array of target molecules and is spatially docked to members of the A-kinase Anchoring Protein (AKAP) family. AKAR2 is a biosensor which yields a FRET signal in vivo, when phosphorylated by PKA. AKAP5, a prominent member of the AKAP family, docks several signaling molecules including PKA, PDE4D, as well as GPCRs, and is obligate for the propagation of the activation of the mitogen-activated protein kinase cascade from GPCRs to ERK1,2.RESULTS:
Using an AKAR2-AKAP5 fusion "biosensor", we investigated the spatial-temporal activation of AKAP5 undergoing phosphorylation by PKA in response to ß-adrenergic stimulation. The pattern of PKA activation reported by AKAR2-AKAP5 is a more rapid and spatially distinct from those "sensed" by AKAR2-AKAP12. Spatial-temporal restriction of activated PKA by AKAP5 was found to "shape" the signaling response. Phosphatase PDE4D tethered to AKAP5 also later reverses within 60 s elevated intracellular cyclic AMP levels stimulated by ß-adrenergic agonist. AKAP12, however, fails to attenuate the rise in cyclic AMP over this time. Fusion of the AKAP5 PDE4D-binding-domain to AKAP12 was found to accelerate a reversal of accumulation of intracellular cyclic AMP.CONCLUSION:
AKAPs, which are scaffolds with tethered enzymes, can "shape" the temporal and spatial aspects of cell signaling.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Mol Signal
Año:
2012
Tipo del documento:
Article
País de afiliación:
Estados Unidos