Adenylyl Cyclase Anchoring by a Kinase Anchor Protein AKAP5 (AKAP79/150) is Important for Postsynaptic β-adrenergic Signaling

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2013 May 8

PMID 23649627

Citations 44

Authors

Mingxu Zhang

Tommaso Patriarchi

Ivar S Stein

Hai Qian

Lucas Matt

Minh Nguyen

Yang K Xiang

Johannes W Hell

Affiliations

Soon will be listed here.

Abstract

Recent evidence indicates that the A kinase anchor protein AKAP5 (AKAP79/150) interacts not only with PKA but also with various adenylyl cyclase (AC) isoforms. However, the physiological relevance of AC-AKAP5 binding is largely unexplored. We now show that postsynaptic targeting of AC by AKAP5 is important for phosphorylation of the AMPA-type glutamate receptor subunit GluA1 on Ser-845 by PKA and for synaptic plasticity. Phosphorylation of GluA1 on Ser-845 is strongly reduced (by 70%) under basal conditions in AKAP5 KO mice but not at all in D36 mice, in which the PKA binding site of AKAP5 (i.e. the C-terminal 36 residues) has been deleted without affecting AC association with GluA1. The increase in Ser-845 phosphorylation upon β-adrenergic stimulation is much more severely impaired in AKAP5 KO than in D36 mice. In parallel, long term potentiation induced by a 5-Hz/180-s tetanus, which mimics the endogenous θ-rhythm and depends on β-adrenergic stimulation, is only modestly affected in acute forebrain slices from D36 mice but completely abrogated in AKAP5 KO mice. Accordingly, anchoring of not only PKA but also AC by AKAP5 is important for regulation of postsynaptic functions and specifically AMPA receptor activity.

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