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The Journal of Neuroscience, April 15, 2002, 22(8):3044-3051
Regulation of GluR1 by the A-Kinase Anchoring Protein 79 (AKAP79) Signaling Complex Shares Properties with Long-Term Depression
Steven J. Tavalin1, Marcie Colledge1, Johannes W. Hell2, Lorene K. Langeberg1, Richard L. Huganir3, and John D. Scott1 1 Howard Hughes Medical Institute, Vollum Institute, Oregon Health Sciences University, Portland, Oregon 97201, 2 Department of Pharmacology, University of Iowa, Iowa City, Iowa 52242, and 3 Howard Hughes Medical Institute, Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
Second messengers regulate synaptic plasticity by influencing the balance between kinase and phosphatase activity. One target of this balance is the phosphorylation state of the AMPA receptor glutamate receptor 1 (GluR1) subunit. Hippocampal long-term depression (LTD) is a calcium-dependent downregulation of synaptic AMPA receptor currents associated with dephosphorylation of Ser845, a cAMP-dependent protein kinase (PKA) site on GluR1. Recruitment of kinases and phosphatases to the AMPA receptor might enable modulation of AMPA receptor function. The neuronal A-kinase anchoring protein AKAP79/150 interacts with PKA and the calcium-dependent protein phosphatase PP2B and is linked to the AMPA receptor GluR1 subunit by synapse-associated protein 97 (SAP97), a membrane-associated guanylate kinase family protein. Here we demonstrate that AKAP79 not only promotes basal phosphorylation of Ser845 but also confers a calcium- and PP2B-mediated downregulation to GluR1 receptor currents. This AKAP79-dependent downregulation is contingent on the local presence of PKA, Ser845 of GluR1, and a PDZ (postsynaptic density 95/Discs large/zona occludens 1)-domain interaction between GluR1 and SAP97, all of which support basal phosphorylation of the receptor. These findings suggest that the AKAP79 signaling complex is sufficient to couple intracellular calcium levels to the PKA phosphorylation state of GluR1. Thus, the integration of intracellular signals relevant for LTD may be transduced to GluR1 by the AKAP79 signaling complex.
Key words: AKAP79; kinase; phosphatase; cAMP; calcium; AMPA receptor; synaptic plasticity
Copyright © 2002 Society for Neuroscience 0270-6474/02/2283044-08$05.00/0
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